96372026 BSC6680 System MML Commands and Expert Parameters V300R008C00 01 XLS En
Preparation Guide to CDMA2000 BSC6680 Engineering Installation
description
Transcript of Preparation Guide to CDMA2000 BSC6680 Engineering Installation
Preparation Guide to CDMA2000 BSC6680 Engineering Installation Internal
Applied Region Overseas Product Name CDMA BSC6680
Target readersCustomer / engineer /
cooperation partnerProduct Version V300R006
Edited by CDMA-BSS TSD Document Version 1.0
Preparation Guide to CDMA2000 BSC6680
Engineering Installation
Drafted
by:Liqi Date: 2009-09-18
Reviewed
by:Zhaochaozhong Date:
Approve
d by:Date:
Huawei Technologies Co, Ltd
All Rights Reserved
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Revision Records
DateRevised
VersionDescription Author
2009-09-18 1.0 1、Finished the draft. Li Qi
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table of Contents
Chapter1 Forward.........................................................................................................................5
Chapter2 Installation Procedure...................................................................................................6
Chapter3 Installation Requirements of CDMA2000 BSC6680...................................................7
3.1 Introduction of CDMA2000 BSS.......................................................................................7
3.1.1 Position of BSC in CDMA2000 System..................................................................7
3.2 Requirements for Layout and Space of the BSC Equipment Room....................................8
3.2.1 Requirements for Layout of the BSC Equipment Room..........................................8
3.2.2 Requirements for the Cabling Space of the BSC Equipment Room........................9
3.2.3 Requirements of Space for Capacity Expansion in the BSC Equipment Room.....11
3.3 Requirements for the BSC Equipment Room...................................................................13
3.3.1 Requirements for the Floor Conditions of the BSC Equipment Room..................13
3.3.2 Requirements for the Construction of the BSC Equipment Room.........................14
3.3.3 Requirements for the Working Environment of the BSC.......................................16
3.3.4 Basic Requirements for the Environment of the BSC............................................20
3.3.5 Requirements for Fire Protection in the BSC Equipment Room............................24
Chapter4 Preparations for Engineering Construction.................................................................25
4.1 Requirements for the Power Supply System of the BSC..................................................25
4.1.1 Power Supply Schemes for the BSC......................................................................25
4.1.2 Requirements for the DC Power Supply of the BSC.............................................26
4.1.3 Requirements for the AC Power Supply of the BSC.............................................27
4.2 Requirements for the Lightning Protection and Grounding of the BSC...........................29
4.2.1 Requirements for the Lightning Protection and Grounding System......................29
4.2.2 Underground Lightning Protection and Grounding System...................................31
4.2.3 Lightning Protection and Grounding of the Equipment Room..............................33
4.2.4 Outdoor Lightning Protection and Grounding System...........................................38
4.2.5 Lightning Protection and Grounding of the Power Supply System.......................41
4.2.6 Requirements for the Lightning Protection and Grounding of Signal Cables........43
4.2.7 Requirements for the Lightning Protection and Grounding of Feeders.................44
4.2.8 Requirements for Lightning Protection and Grounding of Other Equipment........46
4.3 Requirements for Transmission in the BSC......................................................................47
4.3.1 Physical Interfaces on the BSC..............................................................................47
4.3.2 Peer Equipment and Interfaces Supported by the BSC..........................................49
4.3.3 Requirements for the PDF/DDF/ODF....................................................................49
4.4 Requirements for BSC Cable Layout................................................................................50
4.4.1 Installation Specifications for Power Cables and PGND Cables...........................50
4.4.2 Cabling Specifications for the BSC Signal Cables.................................................51
4.5 Requirements for the Clock of the BSC............................................................................56
4.5.1 Clock Resources of the BSC..................................................................................56
4.5.2 Requirements for Clock Precision of the BSC.......................................................57
Chapter5 Checklist for BSC Site Preparation.............................................................................59
5.1 Checklist for the Site Location..........................................................................................59
5.2 Checklist for the Equipment Room Environment.............................................................59
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
5.3 Checklist for the Power Supply System............................................................................60
5.4 Checklist for the Grounding Cables..................................................................................61
5.5 Checklist for the Transmission System.............................................................................62
Chapter6 Physical and Electrical Parameters of CDMA BSC Switching Equipment.................63
6.1 Structure Specifications....................................................................................................63
6.2 Electrical Specifications....................................................................................................63
6.3 Specifications for GPS feeders and jumpers.....................................................................64
Chapter7 Physical and Electrical Parameters of M2000 OMC Equipment............................65
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter1 Forward
Dear Customer,
Thank you for your choice of Huawei Airbridge CDMA system. For the purpose of
better cooperation and successful installation, we compiled this Preparation
Guide to Airbridge CDMA BSS Installation. You are expected to have made good
preparations as required in this guide before Huawei technical engineers arrive
at the construction site. In this way, the equipment could successfully be put into
operation so as to bring social and economic benefits as early as possible.
Before the preparations for the installation, you should carefully read the
following contents:
After you finish all the preparations for the installation, please contact the
regional office in time so that Huawei could arrange engineers for the
engineering installation.
If the installation starts in the case that the preparations are not fully completed
for some reason, you should arrange personnel to prepare for the unsatisfied
conditions as early as possible so as to carry out the installation successfully.
If the installation starts in the case that the preparations are not fully completed
for some reason, but it is impossible for the installation to continue due to the
inadequacy of preparations, Huawei has the right to stop the installation,
depending on the specific situation. After the preparations get fully ready, both
parties can negotiate to arrange for the restart of installation.
If you have any question during the preparations for the installation, please feel
free to consult the regional office of Huawei.
The following lists the information about the regional office of Huawei for your
reference:
Address:
Telephone/fax:
Project owner and telephone:
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter2 Installation Procedure
The installation procedure for Huawei equipment is introduced here for the purpose of a better
understanding and cooperation between both parties. The installation procedure starts with the
signing of the contract and ends with the final acceptance of equipment, followed by the
maintenance procedure. The installation procedure is shown below:
A successful completion of a project requires the close cooperation between you and Huawei. We
hope the installation can successfully be completed.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter3 Installation Requirements of
CDMA2000 BSC6680
3.1 Introduction of CDMA2000 BSS
3.1.1 Position of BSC in CDMA2000 System
PCF:Packet Control Function PDSN:Packet Data Serving Node
HA:Home Agent FA:Foreign Agent
MS:Mobile Station SCP:Service Control Point(Intelligent
Network)Radius:Remote Authentication Dial-in User
Service Figure3-1 CDMA2000 System Structure
The CDMA system consists of several subsystems or functional entities. The base station
subsystem (BSS) is closely related to the wireless cellular technology in the CDMA system.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Through the radio interface, the BSS connects the MS to send and receive radio signals and
manage radio resources. The BSS connects the mobile switching center (MSC) in the network
subsystem (NSS) to transfer system signals and user information between mobile subscribers, or
between mobile subscribers and PSTN subscribers. On the other hand, the BSS connects the
packet data serving node (PDSN) to realize the packet data service.
3.2 Requirements for Layout and Space of the BSC
Equipment Room
3.2.1 Requirements for Layout of the BSC Equipment Room
This topic describes the requirements for ensuring appropriate layout, easy installation, and
neatness in a BSC equipment room.
The requirements for the layout of the BSC equipment room are as follows:
The minimum distance between the front portions of two adjacent cabinet rows
should be 1,800 mm [5.91 ft].
The minimum distance between a wall and a cabinet side that is closest to the wall
should be 800 mm [2.63 ft].
The minimum distance between a wall and the front or the back of its closest cabinet
row should be 800 mm [2.63 ft].
An aisle that is at least 1,000 mm [3.28 ft] wide should be reserved in the equipment
room.
The minimum head room of the equipment room should 3000 mm [9.84 ft].
If the BSC cabinets, BSC cabinets, and PDF are co-located in an equipment room,
Huawei recommends that all the cabinets be installed in one row for facilitating
cable routing.
Figure3-2 shows the layout of the BSC equipment room.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure3-2 Layout of an equipment room (unit: mm)
The layout of the equipment room should be completed by the design department of the
customer or survey engineers, and copies of the layout should be provided to Huawei before
the delivery of products.
3.2.2 Requirements for the Cabling Space of the BSC Equipment
Room
This topic describes the requirements for the cabling space of the BSC equipment room,
where both overhead cabling and underfloor cabling can be used.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Overhead Cabling in the BSC Equipment Room
When overhead cabling is used in the BSC equipment room, the following requirements must
be met:
The minimum distance between the roof and the top of the cabinet should be 1 m
[3.28 ft].
A 200-mm wide space should be kept at both ends of each cabinet row for the
installation of cable racks.
Figure3-3 shows the overhead cabling in an equipment room.
Figure3-3 Overhead cabling in a BSC equipment room (unit: mm)
Underfloor Cabling in the BSC Equipment Room
When underfloor cabling is used in the BSC equipment room, the height of the ESD floor
should be greater than 200 mm [7.87 in.], as shown in Figure3-4.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure3-4 Underfloor cabling in a BSC equipment room (unit: mm)
NOTE:
The height of the ESD floor refers to the distance between the upper surface of the ESD
floor and the surface of the cement floor.
If some of the above conditions cannot be met, you can route the cables based on the
actual situation. Appropriate cable racks, however, must be kept ready.
3.2.3 Requirements of Space for Capacity Expansion in the BSC
Equipment Room
This topic describes the requirements of space for capacity expansion in the BSC equipment
room.
Space Reservation for a Fully-Configured System
A fully-configured BSC consists of one CBCR and one CBSR..
Figure3-5 shows the space reserved for a fully-configured system.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure3-5 Space reserved for a fully-configured system (unit: mm)
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
3.3 Requirements for the BSC Equipment Room
3.3.1 Requirements for the Floor Conditions of the BSC
Equipment Room
This topic describes the requirements for the floor conditions of the BSC equipment room,
including the requirements for the floor type and the requirements for the height of the
equipment room.
Requirements for the Floor Type of the Equipment Room
The BSC can be installed either on a cement floor or on an ESD floor.
Table3-1 lists the requirements for the floor conditions of the BSC equipment room.
Table3-1 Requirements for the floor conditions of the equipment room
Floor Type Requirements for the Floor Conditions
Cement floor The weight-bearing capacity of the equipment room should be
equal to or greater than 450 kg/m2.
The thickness of the floor should be greater than the length of the
expansion bolt assembly.
ESD floor The resistance of the ESD floor must comply with the relevant
requirements.
The floor is firm and tight, with a horizontal error less than 2 mm
[0.08 in.] per square meter.
If an ESD floor is not available, use a static-conductive floor
instead. The volume resistivity of the static-conductive floor must
range from 1.0 x 107 ohms to 1.0 x 1010 ohms.
The floor should be connected to the grounding device through a
current-limiting resistor and cables. The resistance of the resistor
must be 1 Mohms. Tests show that terrazzo (including cement floor)
can met the requirements mentioned above.
All the cable holes should be covered with lids. Ensure that the
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table3-1 Requirements for the floor conditions of the equipment room
Floor Type Requirements for the Floor Conditions
location and size of the holes comply with the engineering design.
Requirements for the Height of the Equipment Room
Locate the equipment room on or above the second floor or at least 600 mm [23.62 in.] above
the maximum flood level recorded in the local area.
3.3.2 Requirements for the Construction of the BSC Equipment
Room
This topic describes the requirements for the BSC equipment room. The equipment room
consists of the switching room, control room (with an area not smaller than 20 m 2[215.273 ft 2]), and auxiliary room. If required, the switching room and the control room can be combined.
During the construction of an equipment room, factors such as cabling (shortest routing of
antenna cables), weight-bearing capacity, power supply, and entrance of transmission cables
must be considered.
Requirements for the Area
The requirements for the area of an equipment room are as follows:
The area must have the scope for future capacity expansions.
The area must facilitate feeder window installation and feeder distribution.
The area must facilitate installation and maintenance of the equipment.
There should be enough space for opening and closing the doors of cabinets.
The actual area of an equipment room depends on the network capacity. For specific
requirements, consult with Huawei survey engineers when planning the layout the equipment
room.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Requirements for the Height
The minimum height of the equipment room, which refers to the distance between the beam
or the wind pipe and the floor, should be 3.5 m [11.48 ft] for overhead cabling and 3 m [9.84
ft] for underfloor cabling. Thus, sufficient space can be reserved for installing the cable rack
and laying cables and feeder pipes.
Requirements for the Weight-Bearing Capacity
The weight-bearing capacity of the equipment room depends on the equipment weight,
equipment base area, installation position, and structure of the equipment room. Ensure that
the weight-bearing capacity is tested by a construction engineer. If the capacity does not meet
the requirements, take appropriate measures to increase the weight-bearing capacity.
Generally speaking, The weight-bearing capacity of the equipment room should be equal to or
greater than 450 kg/m2.
Requirements for the Doors and Windows
The requirements for the doors and windows of the equipment room are as follows:
The size of the doors should be appropriate. Each door should have a lock and key.
Doors and windows should be sealed with anti-dust rubber strips.
Windows exposed to direct sunlight should be covered with reflecting paper or
colored glass. If the sunlight in the room is sufficient, you can block the windows.
Doors and windows should be firm and dustproof. The roof should be waterproof and
dustproof, and the materials used should not be combustible.
Requirements for the Roof and Walls
The requirements for the roof and walls of the equipment room are as follows:
The roof and walls should be heat-insulating and waterproof.
The roof should be waterproofed if there are antenna mast and cable holes in the
roof. Ensure that the roof has the required weight-bearing capacity.
The walls can be painted with lusterless lacquer rather than the paint that easily
chalks.
The roof and walls should be light-colored.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Requirements for Resistance
The intensity requirement of shockproof design of the equipment room should be one degree
higher than the local intensity requirement. If the shockproof design is not satisfactory,
strengthen the construction of the equipment room.
Requirements for Lightning Protection and Grounding
For details, refer to 4.2.3 Lightning Protection and Grounding of the Equipment Room.
Requirements for Dustproofing
The requirements for dustproofing are as follows:
The density of the dust with a diameter greater than 5 micron should be less than
3×104granule/m3.
The dust granules should be non-conductive, non-magnetic, and non-corrosive.
Huawei recommends that the following measures should be taken to make the equipment
room dustproof:
Ensure that the doors and windows are airtight. Equip the outer windows with double-
layer glass and the doors with sealing strips.
Ensure that the shoes and clothes that are used in the equipment room are clean and
washed regularly.
Isolate the control room from the switching room by using aluminum alloy frames with
glass. To prevent dust or any other possible interference, do not allow personnel
from frequently entering the switching room.
If possible, increase the humidity of the equipment room because higher humidity can
reduce static electricity.
Requirements for the Passageway
The requirements for the passageway of an equipment room are as follows:
The width of the transmission passageway should be more than 1.5 m [4.92 ft] and its
height should be more than 2.5 m [8.20 ft].
All the emergency exits in the equipment room should be free from obstructions.
Emergency exit signs should be placed at prominent locations.
The height of the doors of the equipment room should be more than 2 m [6.56 ft] and
their width should be more than 1 m [3.28 ft].
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The height of the elevator should greater than 2.4 m [7.87 ft].
3.3.3 Requirements for the Working Environment of the BSC
This topic describes the requirements for the working environment. The requirements for the
working environment consist of the climatic, waterproof, ESD, biological, air cleanness, and
mechanical stress requirements.
Requirements for Climate
Table3-2 and Table3-3 list the climatic requirements of the BSC.
Table3-2 Requirements for temperature and humidity
Temperature Relative Humidity
Long-term Short-term Long-term Short-term
0℃ to 45℃ -5℃ to +55℃ 5% to 85% 5% to 95%
NOTE:
Measure the temperature and humidity at the place 1.5 m [4.92 ft] above the floor
and 0.4 m [1.31 ft] in front of the cabinet (no protection boards in front or at the rear of
the cabinet).
Short-term refers to a period of less than 96 continuous hours or less than 15 days
in a year.
Table3-3 Other climatic requirements
Item Range
Altitude ≤ 4,000 m [2.48 miles]
Air pressure 70 kPa to 106 kPa
Temperature change rate ≤ 3℃/min [37.40 °F/min]
Solar radiation ≤ 700 W/m2
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table3-3 Other climatic requirements
Item Range
Heat radiation ≤ 600 W/m2
Wind speed ≤ 5 m/s
To meet the above requirements, take the following measures:
Use dustproof materials for the floor, walls, and roof.
Install screen doors and screen windows. Ensure that the outer windows are
dustproof.
Clean the equipment room and air filter regularly (for example, once every three
months).
Wear ESD-preventive shoes and uniforms before entering into the room.
Requirements for the Biological Environment
The working environment of the BSC should meet the following biological requirements:
The environment should not be conducive to the proliferation of fungus or mildew.
There should not be any rodents such as mice.
Requirements for Air Cleanness
The working environment of the BSC should meet the following requirements for air
cleanness:
The air should be free from explosive, conductive, magneto-conductive, or corrosive
dust.
The density of physically active materials must comply with the requirements listed in
Table3-4.
The density of chemically active materials must comply with the requirements listed in
Table3-5.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table3-4 Requirements for physically active materials
Chemically Active Material Unit Density
Dust particles granule/m3 ≤ 3 x 104 (No visible dust on
desks within three days)
NOTE:
Dust particles: diameter ≥ 5 μm
Table3-5 Requirements for chemically active materials
Chemically Active
Materials
Unit Density
SO2 mg/m3 ≤ 0.20
H2S mg/m3 ≤ 0.006
NH3 mg/m3 ≤ 0.05
Cl2 mg/m3 ≤ 0.01
Requirements for mechanical stress
The mechanical stress of the working environment of the BSC should meet the requirements
listed in Table3-6.
Table3-6 Requirements for mechanical stress
Item Sub-Item Range
Sinusoidal vibration Offset ≤ 3.5 mm [0.14 in.] -
Accelerated speed - ≤ 10.0m/s2
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table3-6 Requirements for mechanical stress
Item Sub-Item Range
Frequency range 2 Hz to 9 Hz 9 Hz [9 c/s] to 200 Hz
[9 c/s]
Unsteady impact Impact response
spectrum II
≤ 100 m/s2
Static payload 0
NOTE:
Impact response spectrum refers to the maximum acceleration response curve
generated by the equipment under specified impact excitation. Impact response
spectrum II means that the duration of the semi-sine impact response spectrum is 6
ms.
Static payload refers to the capability of the packed equipment to bear the pressure
from the top in normal pile-up method.
3.3.4 Basic Requirements for the Environment of the BSC
Requirements for ESD Prevention
The absolute value of electrostatic voltage should be less than 1,000 V. To meet the above
requirement, take the following measures:
Train the operators on ESD prevention.
Control the humidity in the room to reduce static electricity.
Equip the equipment room with an antistatic floor or ground the floor properly.
Wear ESD-preventive shoes and uniforms before entering into the room.
Use antistatic tools such as ESD-preventive wrist straps, antistatic tweezers, and
extraction tools during operations.
Ground all the conductive devices (including computer terminals) in the room and
arrange for antistatic workbenches.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Keep non-antistatic materials such as common bags, foams, and rubbers at least 30
cm [0.98 ft] away from boards and ESD-sensitive devices.
Requirements for Anti-Interference
With the development of sciences and technology, interference sources that produce stray
signals have increased rapidly. The stray signals affect communications quality and the
normal operation of the BSC equipment. The possible interference sources are listed as
follows:
Corona discharge of transmission lines
Electromagnetic interference caused by transformers
Various kinds of switch apparatuses
Waveform distortion due to operation on large-sized equipment
Radio-frequency interference
Natural interference such as the terrestrial magnetic field and extraneous radiation
The possible forms that interference takes are capacitance coupling, inductive coupling,
electromagnetic wave radiation, electric conduction of common resistance (including the
grounding system), and electric conduction of various conducting wires (power cables, signal
cables, and output cables).
When external noises exceed the anti-interference capacity of the integrated circuit of
equipment, the equipment may not operate normally. It is impossible to eliminate or shield all
the interference. You can, however, reduce the interference by taking the following measures:
High-frequency interference signals on electric networks are generated by the
coupling of primary coil to secondary coil of the power transformer through the
distributed capacitor. Thus, a low pass filter on led-in power cables and a proper
power transformer can suppress the interference.
To remove the interference caused by the grounding system, prevent various
grounds (signal ground, power ground, protection ground, and shielding ground)
from forming loops, such as the loop formed by a large distributed capacitor. If loops
exist, interference signals affect the normal operation of the equipment through the
coupling of the common resistance of the grounding system.
Protecting the equipment against electromagnetic interference
In some multiple-use buildings, there may be more than one high-frequency
transmitter, whose impact on the BSC equipment must comply with the
requirements specified in the related EMC standards. In addition, make sure that
you ground, shield, and filter the waves for the BSC equipment properly.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
In a high-frequency electromagnetic field (external interference), a high longitudinal
voltage may be inducted in the sheath and the core of the communication cable.
Due to the asymmetry of the core, the longitudinal voltage may generate lateral
noise voltage at the end of the core. The noise voltage causes interference. If the
metallic sheath is grounded, the sheath produces the shield function and the
longitudinal voltage decreases significantly, and the interference voltage is reduced.
Additionally, interference reduction can be achieved through the following methods:
lowering the voltage and current of interference sources, shortening the wires or the
interval of wires for decreasing the area of the interference loop, placing insulated
and interfered wires on the grounded surface, using special ground return cable for
eliminating common resistance, and twisting signal cables and return cables
together for offsetting the partial external electromagnetic interference. All the
methods mentioned earlier are effective.
The density of the electric field in the equipment room must not exceed 300 mV/m.
The density of the magnetic field must not exceed 11 GS.
Requirements for Illumination
The requirements for illumination in the equipment room are as follows:
The equipment room must not be exposed to direct sunlight. Exposure to direct
sunlight can lead to the aging and deformation of circuit boards and other
components.
The battery compartment should be equipped with an explosion-proof lamp that does
not emit bright light.
If the sunlight in the room is sufficient, you can paint or block the windows.
For BSC equipment rooms that have large capacity or great influence, a DC power
supply should be arranged as the standby lighting system.
Requirements for Air Conditioning
Calculate the capacity of the air conditioner based on the area of the equipment room and the
heat emitted by the BSC equipment. For the calculation method, refer to relevant engineering
design specifications.
Generally, you can use two air conditioners so that they can work alternately.
The following equation is used to calculate the heat emitted in the BSC equipment room:
Q = 0.86 x (V x A – W) (kilocalorie/hour)
Where,
Q refers to the heat emitted by the BSC equipment.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
V (in volts) refers to the voltage of the DC power supply.
A (in amperes) refers to the average power consumed in a busy hour.
W (in watts) refers to the effective radiating power of the antenna.
The number 0.86 is the conversion coefficient of electrical energy per watt to heat
energy.
If the BSC equipment room has other telecommunication devices, heat emitted by these
devices should be considered.
The requirements for the air conditioners in the equipment room are as follows:
Humidity: 30% to 75% (50% to 60% preferred.)
Temperature: 18°C to 28°C (20°C to 25°C preferred)
Requirements for Communication
Telephones and facsimile machines should be available in the equipment room.
Requirements for the Environment Control System
The environment control system consists of the timing control, temperature monitor, anti-theft
alarms, smoke alarms, and power supply and backup power control. The system must meet
the following requirements:
The working time and working mode of the air conditioner should be adjusted
automatically according to the measured temperature.
Intrusion, over-high temperature, AC power failure, smoke, and fires, and transfer of
the alarm information to the O&M center should be detected, thus realizing remote
maintenance for the BSC.
Table3-7 lists the requirements for the environment control system.
Table3-7 Requirements for the environment control system
Item Requirement
Timing control According to the time preset based on BSC, the system controls the
timing converter to automatically convert the working states of the air
conditioners. The air conditioners work in turns, and thus the energy
is saved and the life span of the air conditioners is prolonged.
Temperature Detects the temperature in real time and generates alarms when the
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table3-7 Requirements for the environment control system
Item Requirement
monitoring temperature exceeds the thresholds.
Anti-theft alarm Detects the intrusion into the equipment room in real time. The dual-
mode detection annunciator (infrared and microwave) is
recommended.
Smoke alarm Detects smoke or fires in the equipment room in real time.
Power supply and
backup power control
Automatic charging
When the battery detection circuit detects that the power is
insufficient, the system should switch to the automatic charging
state.
Charging protection
The system protects the batteries in the case of abnormal
power supply or over-high charge current.
Discharging protection
The system cuts off the load when the battery charge level
drops and the life span of the battery is affected.
The battery should provide power supply when there is a
power failure. When the mains supply becomes available, the
system should switch back to the mains supply state and the
charging state.
3.3.5 Requirements for Fire Protection in the BSC Equipment
Room
This topic describes the requirements for fire protection in the equipment room.
For buildings with fire resistance rating 1 or 2, the minimum space between buildings should
be 6 m [19.68 ft]. For buildings with fire resistance rating 3 or 4, the minimum space between
buildings should be 7 m [22.96 ft].
Flammable and explosive materials should be kept away from the equipment room.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Fire extinction facilities must be available on the construction site. Alarm devices,
such as smoke sensors and temperature sensors, must be functional.
Sockets of different voltages should be marked noticeably.
Reserved mounting holes in the floor should be installed with safety covers.
If possible, automatic fire extinguishers should be installed. In addition, portable extinguishers
must be available along the aisle of the equipment room.
The water pool for fire extinction should hold sufficient water to extinguish the fire both outside
and inside the room (assuming that the fire lasts for 2 hours). Fire hydrants should be placed
where they are easily accessible. Do not place them inside the room.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter4 Preparations for Engineering
Construction
4.1 Requirements for the Power Supply System of the BSC
4.1.1 Power Supply Schemes for the BSC
This topic describes the power supply system of the BSC. The power supply system consists
of DC power distribution cabinet, PDB, and cables that connect them.
For a large-capacity site or a site with more than two switching systems, provide each of them
with an independent power supply system.
In large-sized communications venues, you should install multiple independent power supply
systems that supply power to the equipment rooms on different floors.
In middle-sized communication offices, you should use either integrated power supply or
dispersed power supply. In small-sized offices, the integrated power supply can be used.
Ensure that the circuit boards are protected from the corrosive gases emitted by the batteries.
Figure4-1 shows the power supply system for the BSC.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure4-1 Power supply system for the BSC
4.1.2 Requirements for the DC Power Supply of the BSC
This topic describes the requirements for the DC power supply of the BSC. To provide stable
and reliable power supply and to shorten the DC feed route as much as possible, you should
place the power equipment close to the telecommunications equipment. To reduce power
consumption and installation cost, ensure that the loop voltage drop between the battery port
and the port on the equipment is less than 3.2 V.
Table4-1 lists the requirements for DC power supply.
Table4-1 Requirements for DC power supply
Item Description
Permissible
range of the
input voltage
–57 V DC to –40 V DC
Bearing
capability for
surge current
At least 1.5 times of the rated current
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table4-1 Requirements for DC power supply
Item Description
Regulated
voltage
precision
If the input AC voltage ranges from 85% to 110% of the rated value, and the
load current ranges from 5% to 100% of the rated value, the output voltage of
the rectifier ranges from –46.0 V to –56.4 V, with the regulated voltage
precision of the rectifier no more than 1%.
On/off
overshoot
amplitude
The switch on/off overshoot amplitude should be equal to or less than ±5% of
the output DC voltage.
Peak-to-peak
noise voltage
≤ 200 mV
Dynamic
response
The restore time is less than 200 ms, with the overshoot amplitude not
exceeding ±5% of the output DC voltage.
The requirements for the DC power supply system are as follows:
The dispersed power supply mode is recommended, that is, multiple DC power
supply systems and power devices can be used.
A standard DC power supply system should be used and the output voltage should
meet the related requirements.
To improve the reliability of the whole power supply system, you should improve the
reliability of the AC power supply system and reduce the battery capacity. If the
reliability of the AC power supply system is difficult to improve, you can increase the
battery capacity.
The capacity of the high-frequency switch rectifier must meet the needs of power of
the equipment and the charging power of the battery. If the number of active
rectifiers is less than 10, use one standby rectifier. If the number is greater than 10,
use one standby rectifier for every 10 active ones.
The batteries should be divided into two or more groups. The battery capacity
depends on the service time of the battery groups that provide power to the system
independently. In most communication offices, the battery group should be able to
power the system for at least one hour.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
4.1.3 Requirements for the AC Power Supply of the BSC
This topic describes the requirements for the AC power supply of the BSC. AC power should
be ready before the construction of the equipment room.
CAUTION:
To ensure the smooth operation of the maintenance terminal in the event of power failure,
UPS should be available.
The centralized power supply mode is preferred for the AC power supply system that consists
of the mains, UPS, and electrical generator.
CAUTION:
The AC backup power and the mains supply must be synchronized in phases, and the
UPS/mains switchover duration must be shorter than 10 ms. If not, the equipment may be
reset or restarted.
In a low-voltage power supply system, three-phase power or single-phase power is preferred.
Table4-2 lists the nominal voltage and frequency of low-voltage AC power.
Table4-2 Nominal voltage and frequency of low-voltage AC power
Nominal Voltage (Unit: V) Nominal Frequency (Unit: Hz)
110, 127, 200, 220, 230, 240, or 380 50 or 60
NOTE:
Power supply systems vary with countries, regions, or areas. For example, a country may use
the three-phase three-wire of 200 V, three-phase four-wire of 200 V, or single-phase three-
wire of 200 V power.
When you determine the AC power distribution capacity in the equipment room, consider the
working current and faulty current to ensure that individual equipment has an independent AC
distribution protection device. The protection switch should be more powerful than that of the
lower-level electricity devices. Cable outlet of the power distribution panel is determined by
the maximum load capacity of power supply. The type and specification of cables are chosen
accordingly.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The following lists the specific requirements for the AC voltage of communications equipment
and power supply equipment:
If the communications equipment uses the AC power supply, the permissible voltage
range should be –10% to +5% of the nominal voltage.
If the power supply equipment and important buildings uses the AC power supply, the
permissible voltage range should be –15% to +10% of the nominal voltage.
The permissible fluctuation range of AC frequencies should be within ±4%. The
sinusoidal distortion rate of the voltage waveform should be lower than or equal to
5%.
The requirements for the electrical generators are as follows:
No loud noise
Automatic power-on and power-off, supply, and communication
Remote control and measurement
Standard interfaces and communication protocols
The requirements for the AC power cables are as follows:
For the AC neutral for communications, the conducting wire should have the same
cross-sectional area as the phase line.
The AC conducting wires should be fire-resistant. The layout of the AC power cables
must comply with local regulations.
The requirements for the AC power supply system are as follows:
Use the voltage regulator in any of the following situations:
The communications equipment is powered directly by the mains supply, and
the input voltage exceeds the nominal voltage by –10% to +5% or exceeds the
permissible voltage range for the communications equipment.
The communications equipment is not powered directly by the mains supply,
but the mains voltage exceeds the nominal voltage by –15% to +10% or
exceeds the permissible AC input voltage for the DC power supplier.
A UPS or inverter should be used to ensure stable power supply.
An electrical generator should be configured for the office to ensure proper
communication in the event of mains failure. The minimum capacity of the generator
should be 1.5 to 2 times of the total capacity of the UPS and the inverter.
The capacity of the UPS or inverter must be greater than the total load power,
preferably with a surplus of 80% of the total load power. Backup is required for the
use of the UPS or inverter.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
4.2 Requirements for the Lightning Protection and
Grounding of the BSC
4.2.1 Requirements for the Lightning Protection and Grounding
System
This topic describes the basic requirements for grounding and the requirements for the
grounding resistance, grounding of the DC power distribution system, equipotential
grounding, and lightning rod.
Basic Requirements for Grounding
The basic requirements for grounding are as follows:
The neutral lines of AC power cables must not be connected to the protection ground
of any communications devices.
All grounding cables must be short and straight. The grounding cables cannot be
twisted.
Fuses or switches must not be installed on grounding cables.
The grounding cables should be securely connected to the protection grounding bar
of the equipment room. In case of oxidation, bad contact may be caused between
the grounding cables and the grounding bar, thus increasing the resistance.
Requirements for the Grounding Resistance
CAUTION:
The joint grounding system should interconnect the working ground, the protection
ground, the grounding system of the building, and the grounding system of the industrial
frequency AC power supply.
The grounding resistance must meet the requirements specified by local countries or
telecommunication operators.
The requirements for the grounding resistance are as follows:
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The grounding resistance of the joint grounding system must be less than or equal to
10 ohms.
For other devices in the equipment room, the lowest grounding resistance should be
applied.
Requirements for the Grounding of the DC Power Distribution System
The DC working ground (reflow ground of the –48 V DC or +24 V DC power supply) must be
connected with the indoor grounding bar nearby. The grounding cable must be capable of
supporting the maximum load of the system.
Requirements for Equipotential Grounding
The requirements for equipotential grounding are as follows:
All the equipment and auxiliary facilities in the equipment room must be grounded
properly.
All the protection grounds must be connected to a grounding bar, and the protection
grounds in an equipment room must be connected to the protection grounding bar of the
equipment room.
The working grounds and protection grounds must share the same group of
grounding grids.
The grounding grids for the equipment room, tower, and power transformer must be
interconnected underground in a multi-point manner. If the tower is located on the roof of
the equipment room and the power transformer is located in the equipment room, the
tower and the power transformer can share the grounding grid of the equipment room.
Figure4-2 shows the grounding grids.
Figure4-2 Grounding grids
The cable rack, steel shelf, rack or chassis, metallic air conduit, and metallic window
and door must be properly grounded.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Requirements for the Lightning Rod
The antenna of the base station must be protected by the lightning rod, that is, the antenna
must be located within the protection range of the lightning rod.
The lightning rod must have a special surge current leadin, which is made from 40 mm [1.57
in.] x 4 mm [0.16 in.] galvanized flat steel.
4.2.2 Underground Lightning Protection and Grounding System
This topic describes the requirements for the underground lightning protection and grounding
system.
Various grounding copper bars are connected to the grounding grid through copper cables.
The sectional area of cables must meet the local or national requirements.
Figure4-3 shows the underground grounding grid.
Figure4-3 Underground grounding grid
NOTE:
You can arrange for a grounding bar in the equipment room. The indoor rack grounding bar,
AC grounding bar, and DC grounding bar are connected to the grounding bar.
The requirements for the grounding facilities shown in Figure4-3 are as follows:
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The grounding grids for the power transformer, steel tower, and equipment room form
a uniform grounding grid. The grounding grid must be connected to at least two steel
bars of the building and tower.
The outdoor grounding ring can be connected in an L-shape or a C-shape. In areas
where the soil has a low conductivity or there is a shortage of soil, use grounding stretch
body. The grounding stretch body is a concrete bridge with built-in cables. It stretches
outward from the corners of the grounding ring. The concrete bridge has strong moisture
absorption capability. The recommended length of the grounding stretch body is 10 m
[32.81 ft] to 30 m [98.42 ft].
It is recommended to use hot galvanized steel grounding pole with the specifications
as follows:
Steel tube: φ50 mm [1.97 in.], and greater than 3.5 mm [0.14 in.] in thickness
Angle steel: no less than 50 mm [1.97 in.] x 50 mm [1.97 in.] x 5 mm [0.197
in.] in volume
Flat steel: no less than 40 mm [1.57 in.] x 4 mm [0.16 in.] in size
Length: 1.5 m [4.92 ft] to 2.5 m [8.20 ft]
The space between the grounding poles is 1.5 to 2 times the length of a grounding pole.
The upper end of the grounding pole should be more than 0.7 m [2.30 ft] from the
ground surface. In cold areas, the entire grounding pole should be buried under the
frozen soil layer.
The grounding ring should be buried 0.7 m [2.30 ft] into the cement base.
Whether to use resistivity reduction mixture depends on the location of the equipment
room and the status of the soil.
4.2.3 Lightning Protection and Grounding of the Equipment
Room
This topic describes the requirements for the lightning protection and grounding system of the
equipment room. The system consists of the indoor grounding bar, cable rack, grounding
leadin, earth electrode, and grounding resistance.
Overview
The grounding copper bars are available in the equipment room.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
In areas where lightning strikes frequently, the overhead bare wire ring on the internal wall of
the equipment room must also be grounded indoors. Several parts of the wire ring are
connected to the outdoor port of the grounding system. The wire ring is used to ground the
conductors of the door and window.
Figure4-4 shows the grounding system of the equipment room.
Figure4-4 Grounding system of the equipment room
NOTE:
Arrange for a grounding bar to interconnect the protection grounds and the working
ground of the devices in the equipment room.
Use 40 mm [1.57 in.] x 4 mm [0.16 in.] or 50 mm [1.97 in.] x 5 mm [0.20 in.] galvanized
flat steel as the grounding leadin. Take protective measures for the projecting parts of
the grounding leadin.
Indoor Grounding Bar
The indoor grounding bar is generally installed on a wall. The wall near the base station and
power supply cabinet is used and it is as high as the cable rack. A single black grounding
cable connects the grounding bar to the earth electrode.
Cable Rack
The indoor cable rack is connected to the indoor grounding bar by using a cable.
The indoor cable rack must be connected separately from the outdoor cable rack.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Both ends of the cable rack must be properly grounded.
When the connectors between the cable racks are not connected properly, add
cables to improve the electrical connection between the cable racks.
Grounding Lead-In
CAUTION:
The same metal material should be used for the entire lightning protection system that
consists of the lightning rods, lead-in, and grounding body. This prevents corrosion and
poor grounding owing to long-term electrochemical reaction.
The copper should not contact the galvanized iron parts directly because copper-zinc
battery may be formed on the contact surface and thus cause corrosion.
The flat braided wires or bunched wires cannot be used as the grounding lead-ins. They are
susceptible to corrosion and oxidation. In addition, they have strong electric inductance and
mutual inductance, thus affecting surge current discharge.
The grounding lead-in should use galvanized flat steel or φ16 to φ18 screw-thread steel.
The grounding lead-in must be welded with the lightning rods and the grounding body. The
contact seam must be longer than 20 cm [7.87 in.]. Otherwise, high current passing through
the seam can make the small contact area hot and probably cause serious sealing-off.
When the grounding cable is led down from the roof,
do not arrange the cable near or in parallel with other conductors. Regardless of
whether the other conductors are grounded, the space between the grounding cable
and the conductors must be more than 2 m [6.56 ft].
When the grounding lead-in has to pass through a metallic tube,
connect the two ends of the lead-in to the two ends of the metallic tube. This
metallic tube is also called the connection cable of the grounding cable.
NOTE:
The earth electrode under the steel tower must be as close as possible to the bottom of the
steel tower.
Earth Electrode
NOTE:
The grounding resistance is the sum of the drifting resistance of grounding bodies and
the resistance of grounding cables.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The drifting resistance is the resistance of the grounding body and the resistance in the
soil within the reach of 20 m [65.62 ft] around the grounding body.
If the grounding cable is not too long, ignore its resistance.
The grounding resistance must be less than or equal to 10 ohms.
The formula for calculating the DC or industrial frequency drifting resistance varies according
to the types of earth electrodes, the number of grounding poles, and the forms of
combination. The following part lists some of the formulas that are used to estimate the
grounding resistance of commonly used earth electrode sets:
Single piece of steel pipe vertical bar
If the earth electrode of steel pipe has a length of 2.5 m [8.20 ft], a diameter of 5 cm
[1.97 in.], and a buried depth of more than 0.5 m [1.64 ft] (from the top of the tube to the
ground), you can use the following formula to calculate its grounding resistance:
R ≈ 0.3ρ (ohms)
ρ: resistivity of soil
A horizontal flat steel band
When the length of the flat steel band is about 60 cm [23.62 in.], its grounding resistance
is defined as:
R ≈ 0.03ρ (ohms)
Parallel earth electrode set constituted by four steel pipes
The grounding resistance is defined as:
R ≈ 0.051ρ (ohms)
The vertical grounding poles of the earth electrode set use four steel pipes
with a length of 2.5 m [8.20 ft] and a diameter of 5 cm [1.97 in.]. Its depth in the soil
is 0.5 m [1.64 ft]. The space between the pipes is 5 m [16.40 ft], and the horizontal
connecting wires between these tubes are 40 mm x 4 mm [1.57 in. x 0.16 in.]
galvanized flat steel bars, as shown in Figure4-5.
Figure4-5 Parallel earth electrode set constituted by four steel pipes
Rectangular earth electrode set constituted by six steel pipes, as shown in Figure4-6.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure4-6 Connection of vertical grounding poles of the earth electrode set
As shown in Figure 4-6, the steel pipes are the same as those in the parallel earth
electrode set. The grounding resistance is defined as:
R ≈ 0.045ρ (ohms)
In this formula, soil resistance is the key factor. The actual soil resistivity can be
measured by using a grounding resistance tester on site. If the actual value cannot be
obtained, refer to the values listed in Table4-3.
Table4-3 Resistivity of soils
Soil Type Resistivity (ρ/ohm·m)
Sea water 1 to 5
Kaolin 10
Peat and marshland 20
Lake water and pond water 30
Black soil, garden loam, malm, and pottery
clay
50
Clay 60
Sandy clay 100
Concrete in wet soil 100 to 200
Loess 200
Sandy clay and sandy soil 300
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table4-3 Resistivity of soils
Soil Type Resistivity (ρ/ohm·m)
Rocky soil 400
Topsoil mixed with stones and under-layer
gravel (humidity: 15% RH)
500
Sands and clay soil (with a depth less than
1.5 m [4.92 ft], and being rocky at the bottom
layer)
1000
Gravel, detritus, and rock mountain 5000
Granite 20000
The impact grounding resistance (Rch) equals to the DC grounding resistance
multiplied by the impact factor, where:
Rch = αR (ohms)
R indicates the DC (or industrial frequency) grounding resistance.
α is the impact coefficient.
The impact coefficient is related to the shape and size of the earth electrode, the
impact current, and the resistivity of the soil. The value of α ranges from 0.25 to
1.25. For a tabular vertical grounding body, the value of α ranges from 0.25 to 0.9.
NOTE:
The type and temperature of the soil around the grounding pole affect the grounding
resistance. To improve the grounding resistance, do as follows:
In areas where the soil conditions are poor, the chemical resistance-reducing agent (for
example, acrylamide resistance-reducing agent) can be added around the grounding
pole.
In the high-latitude areas where the soil temperature is below 0oC, the grounding pole
can be deeply buried and chemical resistance-reducing agent can be added.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
4.2.4 Outdoor Lightning Protection and Grounding System
This topic describes the outdoor grounding system, the lightning protection and grounding of
the RF antenna system, and the lightning protection and grounding of the satellite antenna
system.
Overview
The outdoor lightning protection and grounding system consists of the grounding of the
building, the grounding of the steel tower, and the grounding of the antenna system. The
outdoor grounding system provides channels for the discharge of strong surge current caused
by lightning. If the sectional area of the grounding conductor is less than 150 mm2 [0.23 in.2],
keep the routing of the conductor as straight as possible.
CAUTION:
The grounding resistance must meet the local requirements. If there is no reference standard
for the resistance in the local area, the grounding resistance must be less than or equal to 10
ohms.
Figure4-7 shows the outdoor grounding system.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure4-7 Outdoor grounding of the building and steel tower
The outdoor grounding bar is generally installed at a place that is not more than 1 m [3.28 ft]
away from the feeder window. The grounding bar is connected to the earth electrode through
a black cable with a sectional area of more than 95 mm2 [0.147 in.2]. For details about the
installation of the outdoor grounding bar, refer to the instructions on the installation of the
indoor grounding bar.
Fastening the Grounding Clip of the Feeder
CAUTION:
When connecting the grounding cables to the grounding points such as the steel tower,
cable rack, and grounding bar, remove the anticorrosive paint on the contact part. After
connecting the grounding cables, coat the lug, nut, and grounding points using
anticorrosive paint and wrap the bare wire and the lug handle using an insulating tape.
When the grounding cables are grounded through the base of the grounding clip, the
installation of the base must meet the requirements mentioned above.
The requirements for the installation of the grounding clip are as follows:
When installing the grounding clip of the feeder on the steel tower,
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
If there is space for installing the grounding clip,
the grounding cables should be connected directly to the steel plate of the tower. In
this way, the tower can function as the conductor to discharge the surge current.
For details about the installation of the grounding clip of the feeder, refer to the
related instructions.
If there is no space for installing the grounding clip,
the base of the grounding clip should be located on the tower or the outdoor cable
rack, and the grounding cables should be connected to the base.
When installing the grounding clip on the roof of a building without a steel tower,
connect the clip to the grounding grid on the roof of a nearby building and ensure that
the grounding grid is grounded properly.
When installing the grounding clip on the outdoor cable rack,
connect the grounding cables properly to the grounded cable rack.
When leading feeders into the equipment room,
If the outdoor grounding bar is installed,
connect the grounding cables to the outdoor grounding bar and arrange the
grounding cables neatly. Connect the outdoor grounding bar to the grounding grid
by using the special conductor.
If the outdoor grounding bar is not installed,
connect the grounding cables properly to the grounded outdoor cable rack or to the
grounding grid of the building.
The connection points between the grounding cables and the grounding points
must be painted with anticorrosive paint.
4.2.5 Lightning Protection and Grounding of the Power Supply
System
This topic describes the lightning protection measures that should be taken for the power
supply system of the base station and the power cables.
Requirements for the Lightning Protection of the Power Supply System
The requirements for the lightning protection of the power supply system are as follows:
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The DC working ground (reflow ground of the –48 V DC or +24 V DC power supply)
must be connected with the indoor grounding bar nearby. The grounding cable must
be capable of supporting the maximum load of the system.
The TN-S power supply system must be used in the event of AC power supply.
A dedicated power transformer must be used for the base station. Before the power
cables are connected to the base station, the cables must be covered by metal
jackets or steel tubes, buried under the ground (the buried section must be at least
15 m [49.21 ft.] long), and properly grounded.
When the power transformer is installed outside the equipment room, the following
requirements must be met:
For areas with more than 20 thunderstorm days every year and a ground
resistance greater than 100 ohm·m, install lightning protection cables for the
aerial cables. The length of the lightning protection cable must not be less than
500 m [1640.40 ft].
The angles formed between the power cables and the lightning protection
cables must be less than 25o.
All poles of the lightning protection cables (except for the last pole) must be
grounded independently.
NOTE:
A set of zinc oxide lightning arresters must be installed at the next to the last pole.
If the lightning protection cables for existing aerial power cables cannot be installed,
install the zinc oxide lightning arresters for each of the following poles of the aerial power
cables: the last pole, the last but one pole, the last but two or three pole, and the last but
four pole. In addition, install a set of high-voltage fuses for the last but three or four pole.
The lightning protection cable and the grounding body of the lightning arrester should be
of an outstretching or circle structure.
When the power transformer is installed inside the equipment room, the following
requirements must be met:
Lead the high-voltage power cables into the equipment room through
underground channels. The length of the power cables must not be less than
200 m [656.16 ft].
Install zinc oxide lightning arresters for the three phase lines that connect the
power cables and the aerial power cables. The metallic sheath of the power
cables should be grounded properly.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
For the low-voltage power cables that are led into the equipment room, the following
requirements must be met:
Bury the cables under the ground before they enter the base station, and the
length of the cables should not be less than 15 m [49.2 ft]. If the high-voltage
side of the transformer uses power cables, the length of the low-voltage power
cables may vary based on the actual situation.
Install a lightning arrester at the place where the power cables connect the
AC power distribution panel. The neutral lines led out of the power distribution
panel need not be grounded.
For the three phase lines at the high-voltage side of the power transformer, the
following requirements must be met:
Install a set of zinc oxide lightning arresters near the phase lines.
Install seamless zinc oxide lightning arresters properly for the three phase
lines at the low-voltage side of the power transformer.
Ground the chassis of the power transformer, the neutral lines at the low-
voltage side, and the metallic sheath of the power cables connected with the
transformer properly.
Install lightning arresters at the place where cables run in or run out of the
base station.
Ground the uncharged parts of the power supply devices and the lightning arrester
properly. Do not conduct neutral protection.
Connect the DC working ground with the nearby indoor grounding bar.
The cross-sectional area of the grounding cables must range from 35 mm2
[0.054 in.2] to 95 mm2 [0.147 in.2] so that the cables are capable of supporting
the maximum load.
Use strand copper wires as grounding cables.
Equip the AC panel and rectifier (or high frequency switch power supply) with multi-
level protection devices.
The voltage withstanding capability of the lightning arresters must conform to the
relevant standards.
Requirements for the Lightning Protection of Led-In Power Cables
The requirements for the power cables led into the equipment room are as follows:
Install lightning arresters.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Do not lead AC or DC power cables into or out of the communications sites in an
overhead way.
After the low-voltage power cables are led into the AC rectifier and AC power
distribution box, the power cables must be equipped with a lightning arrester that is
grounded properly.
In rural areas, install a lightning arrester of which the current discharge
capacity must be equal to or greater than 40 kA.
In suburbs where thunderstorms occur relatively frequently, install a lightning
arrester of which the current discharge capacity must be greater than 40 kA.
In mountain areas that are prone to thunderstorms or in a high building that
stands alone, install a lightning arrester of which the current discharge capacity
must be greater than 100 kA.
The grounding cable of the lightning arrester must be less than 1 m [3.28 ft] in length
and greater than 25 mm2 [0.039 in.2]in cross-sectional area.
4.2.6 Requirements for the Lightning Protection and Grounding
of Signal Cables
For the lighting protection of the signal cables, you can use shielded cables, installing
lightning arresters, or grounding the signal cables.
The requirements for the lightning protection of signal cables are as follows:
Do not route the signal cables in an overhead way.
Install lightning arresters at the place where the signal cables enter the base station.
Ground the idle lines in the signal cables properly.
Ground the ends of the metallic tubes that cover the outdoor signal cables properly.
Bury the signal cables under the ground before you lead the cables into the
equipment room or after you lead the cables out of the equipment room.
Ground the shielding layers securely before leading the signal cables into the
equipment room.
Ground the lightning arresters properly.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
For areas that experience thunderstorms for more than 20 days every year and
where the ground resistance is greater than 100 ohm·m, take the following
measures during cable routing:
Route drainage wires over the signal cables.
Use the signal cables covered by metallic sheath.
Use optical fibers.
NOTE:
Huawei recommends that all signal cables use shielded cables.
Huawei recommends that lightning arresters be used for interconnection devices, so that
the protection against a differential mode of 3 kA or a common mode of 5 kA is achieved.
4.2.7 Requirements for the Lightning Protection and Grounding
of Feeders
This topic describes the environment requirements of the satellite antennas and feeders.
Location Requirements of the Satellite Antennas
The location requirements of the satellite antennas are as follows:
The space between two antennas must be equal to or less than 1 m [3.28 ft].
The antennas should be located beyond the coverage of a directional antenna of
which the transmit power is greater than 1 W and the frequency is higher than 400 MHz.
In addition, the antennas should be located at least 20 m [62.62 ft] away from omni
antennas.
If possible, the antennas should be installed in the center of a roof. Do not install
them on the surrounding parapets or the corners of a roof.
If an antennas has to be installed on a parapet, the antenna should be preferably
installed at an area where it does not affect the aesthetics of the building and the feeder
can be fixed easily. In addition, the parapet should be strong so that it can be drilled for
mounting expansion bolts. A parapet of more than 600 mm [1.97 ft] in height is
recommended for mounting expansion bolts.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
If an antenna has to be installed on a tower, the location of the antenna should be
higher than the top of the building where the equipment room is located. The antenna
should be kept far away from the high-power antenna on the top of the tower.
If a dedicated lightning rod is unavailable, lightning rods on the top of buildings or
towers work. In this case, you must consider the effect of interference.
The angle between the receiving end of the antenna and the lightning rod or the
angle between the connection line at the top of the tower and the vertical line must be
less than 45°. In areas prone to thunderstorms (more than 20 days every year), the
angle must be less than 30°. The horizontal distance between the antenna and the
lightning rod must be greater than 2 m [6.56 ft].
The upward vertical angle of the antenna should be greater than 90°, as shown in
Figure4-8.
Figure4-8 Location of the antenna
Location Requirements of the Feeders
The requirements for installing antennas are as follows:
When the antenna is installed on a roof, make sure that you route the feeder along
the root of the podium of the building roof and fix the feeder using a plastic clip with
steel nails. Arrange the tips of the plastic pieces alternately in opposite directions.
The space between the plastic pieces should be 1 m [3.28 ft]. All plastic pieces
should be aligned with the surface of the wall so that the cable reaches the cable
ladder on the roof. If the feeder is routed along the tower, use fixing clips to fix the
feeder.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
When laying out a feeder, make sure that you expand the feeder first and avoid
bending it. If you have to bend it, ensure that the bending radius of the feeders
should be 20 times greater than the diameter of the feeder.
Use reliable material such as a packing bag to protect the connectors on both ends of
the feeder.
If there are two feeders, use temporary labels to identify them. You can write the
temporary labels in the same manner as the formal labels, or in any other manner.
Do not cross the feeders.
If the feeders are routed along a cable ladder, fix them using fixing clips with a space
of 2 m [6.56 ft].
The path from the building roof to the BSC room should be free of any obstacles. In
addition, waterproof and anticorrosion measures should be taken for the feeders.
Before leading the feeder indoors, bend the feeder to make a waterproof curve. The
vertical distance between the lowest part of the waterproof curve and the entrance
should be at least 200 mm [7.87 in.], to keep the rain water out of the room.
4.2.8 Requirements for Lightning Protection and Grounding of
Other Equipment
This topic describes the requirements for the lightning protection and grounding of other
equipment, such as the equipment room, metallic devices on the roof, bulbs on the roof, and
the cable rack.
The requirements for the lightning protection and grounding of the other equipment are as
follows:
The equipment room should be equipped with the devices, such as a lightning
protection band, lightning protection network, and lightning arrester. These devices
can protect the equipment from direct lightning strikes and inductive lightning
strikes.
All metallic devices on the roof of the equipment room should be connected with the
nearby lightning protection band.
The bulbs on the roof of the equipment room should be installed under the lightning
protection band.
If the power cables of the bulbs are routed through the tower or top of the building,
the cables must be enclosed in a metal tube.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
The cable rack, steel shelf, rack or chassis, metallic air conduit, and metallic window
and door must be properly grounded.
The grounding cables are a bundle of copper wires with a cross-sectional area of
more than 25 mm2 [0.039 in.2].
4.3 Requirements for Transmission in the BSC
4.3.1 Physical Interfaces on the BSC
This topic describes the physical interfaces on the BSC.
Specifications of Data Transmission Ports
The BSC has external and internal ports for data transmission. The external ports are used
for data transmission over the Abis, A, and PCF interfaces. Table4-4 lists the specifications of the external transmission ports.
Table4-4 Specifications of the external transmission ports
Port Name Board Port
Type
Remarks
E1/T1 AEUBa DB44 This port is used for the ATM
transmission over the Abis
interface.
EIUAa DB44 This port is used for the TDM
transmission over the A interface.
PEUBa DB44 This port is used for the IP
transmission over the Abis
interface.
PEUAa DB44 This port is used for the IP
transmission over the A interface.
Channelized
STM-1/OC3
OIUAa LC/PC This port is used for the TDM
transmission over the A interface.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table4-4 Specifications of the external transmission ports
Port Name Board Port
Type
Remarks
AOUBa/AO1Ba LC/PC This port is used for the ATM
transmission over the Abis
interface.
PO1Ba/POUBa/PO1Aa/
POUAa
LC/PC This port is used for the IP
transmission over the Abis
interface and A interface.
FE/GE
electrical
port
FG1Ba/FG2Ba RJ45 This port is used for the IP
transmission over the Abis
interface.
FG1Aa/FG2Aa RJ45 This port is used for the IP
transmission over the A interface.
FG1Pa/FG2Pa/FG1Xa/FG2Xa RJ45 This port is used for the IP
transmission over the PCF
interface.
GE optical
port
GOUPa/GOUXa LC/PC This port is used for the IP
transmission over the PCF
interface.
The internal transmission ports of the BSC are used for inter-subrack communication inside
the BSC. Table4-4 lists the specifications of the internal transmission ports.
Table4-5 Specifications of the internal transmission ports
Port Name Board Port Type Remarks
GE electrical port SCUOa RJ45 This port is used for the interconnection
between the CMPS and the CSPS inside
the BSC.
Specifications of the Clock Signal Ports and Satellite Signal Ports
Table4-6 lists the specifications of the clock signal ports and satellite signal ports.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table4-6 Specifications of the clock signal ports and satellite signal ports
Port Type Board Port Port Type Remarks
GPS satellite
antenna port
ANT port on the panel
of the GCUOa
SMA male connector This port is used to
receive timing
information from the
GPS satellite system.
Clock signal
output port
CLKOUT port of the
GCUOa
RJ45 This port is used to
send 8 kHz and 1PPS
clock signals to the
SCUOa.
Clock signal
input port
CLKIN port of the
SCUOa
RJ45 This port is used to
receive 8 kHz and
1PPS clock signals
from the GCUOa.
CLKIN0 and CLKIN1
ports of the GCUOa
SMB male connector This port is used to
receive clock signals
from the BITS.
4.3.2 Peer Equipment and Interfaces Supported by the BSC
The BSC is connnected to the BTS, MSC, PDSN, and another BSC through the Abis, A1/A2,
A1p/A2p, A10/A11, and A3/A7 interfaces respectively.
4.3.3 Requirements for the PDF/DDF/ODF
If the BSC uses the PDF, DDF, or ODF, ensure that the PDF, DDF, or ODF meets the
associated requirements.
Requirements for the PDF
If the PDF is far from the BSC cabinet (for example, they are located in different equipment
rooms), the PGND cable of the BSC cabinet should be connected to the closest protection
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
grounding bar, that is, the cabinet is co-grounded with the PDF. For details about the routing
of the PGND cable, refer to the topic on the PGND cable of the PDF.
Requirements for the DDF
Prior to site deployment, a standard DDF should be arranged and installed by the customer.
The capacity of the DDF should meet the current demand and allow for future expansions. If
the capacity of the DDF is insufficient, Huawei recommends that a larger-capacity DDF
should be installed as soon as possible.
The connectors of the DDF should match the trunk cables. For details about the specifications
of the trunk cables, refer to the contract or contact design engineers. For the installation of the
DDF, copper cables with a cross-sectional area larger than 6 mm2 [0.0093 in.2] should be
used. The cables should be connected to the protection grounding bar in the equipment room.
Requirements for the ODF
The requirements for the ODF are as follows:
The optical ports of the ODF should be allocated following a top-down and left-right
sequence (facing outwards).
The metal case of the ODF and the internal wires of the optical cables should be
properly grounded.
For the installation of the ODF, copper cables with a cross-sectional area larger than
6 mm2 [0.0093 in.2] should be used. The cables should be connected to the
protection grounding bar in the equipment room.
4.4 Requirements for BSC Cable Layout
This topic describes the requirements for the layout of power cables, PGND cables, and
signal cables of the BSC.
4.4.1 Installation Specifications for Power Cables and PGND
Cables
The installation of power cables and PGND cables must meet the requirements for cable
layout and binding.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Requirements for Cable Layout
Before the layout of power cables and PGND cables, cable connectors should be
wrapped with insulating tape to avoid contact with PDF connecting terminals.
The layout of power cables and PGND cables should allow for future expansion.
Power cables and PGND cables should be routed separately from signal cables.
When power cables and PGND cables are parallel with signal cables, the spacing
between them should not be less than 10 mm [0.39 in.] inside the cabinet or less
than 100 mm [3.94 in.] outside the cabinet.
The bending radius of cables at turning should be five times larger than their
diameter.
During underfloor cabling, power cables should have an extra length at the cable inlet
of the PDB on top of the cabinet to ease insertion and removal. Power cables
should also be routed tidily.
When power cables are connected to the wiring terminals on the PDB in the cabinet,
they should be routed straight and bent smoothly at turning.
Requirements for Cable Binding
Power cables and PGND cables should be bound separately from signal cables.
Power cables and PGND cables should be bound at an interval of 200 mm [7.87 in.].
During underfloor cabling, power cables and PGND cables should be routed along
the column in the cabinet and bound to the wire bushing.
Cable ties of different types (100 mm [3.94 in.]/150 mm [5.91 in.]/300 mm [11.81 in.])
should be used depending on the number of cables.
Cable ties should face to the same direction.
The extra part of cable ties should be stripped off and all cuts should be smooth
without sharp projections. The cable ties indoors should be cut flush, and those
outdoors should have an extra length of 3 mm [0.12 in.] to 5 mm [0.2 in.].
4.4.2 Cabling Specifications for the BSC Signal Cables
This topic describes the cabling specifications for the BSC signal cables. The specifications
helps to ensure appropriate bending radius, neat routing, and appropriate binding of signal
cables.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Requirements for the Installation of BSC Signal Cables
If the connectors of the signal cables are made before delivery, pack the connectors
with soft and durable materials during the cabling to avoid damage.
Ensure that the jackets of the signal cables are not damaged during the cabling.
The actual installation positions of the signal cables must meet the requirements of
site survey and the data configuration.
When installing the optical cables, do not step on or stretch the optical cables.
Otherwise, the optical cables may be damaged.
Use dustproof caps to cover the optical connectors that are not in use.
When coiling extra optical fibers in the rear-mounted optical cable box, apply proper
force to avoid damaging the optical fibers.
Related operation guides describe the installation methods only. For the actual
installation positions of the cables, refer to the site survey requirements and the data
configuration plan.
When installing the signal cables, coil extra interconnection cables on the cable
ladder. Ensure that the bending radius meets the requirement.
Minimum Bending Radiuses of BSC Signal Cables
Table4-7 lists the requirements for the bending radii of BSC signal cables.
Table4-7 Minimum bending radii of signal cables
Cable Minimum Bending Radius
Ethernet cable 25 mm [0.98 in.]
Optical cable 40 mm [1.57 in.]
Trunk cable 40 mm [1.57 in.]
Requirements for the Routing of BSC Signal Cables
Separate the signal cables from the power cables. If the signal cables cross the
power cables, the angle must be 90°.
Ensure that the requirements for the bending radii of signal cables listed in Table4-7
are met.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Reserve extra lengths of signal cables near connectors for the convenience of
inserting and pulling the connectors.
Do not cross the signal cables over each other when routing the signal cables inside
the cabinet. The signal cables shall be led out along the two sides of the subrack.
Arrange the cables of which the connectors are far away from the ports on the external
side of the cable bundle and other cables on the internal side of the cable bundle. The
cables must not cross each other, and they should routed neatly without any tangling.
When the signal cables are routed on the cable ladder and the distance between the
cable ladder and the top of the cabinet exceeds 800 mm [2.62 ft], use a ladder to lead
the signal cables downwards.
Lead the signal cables into or out of the cabinet through the cable holes, as shown in
Figure4-9. Before routing, remove the plastic rodent-proof nets from the cable holes.
After routing, cut appropriate plastic rodent-proof cover plates, cover the cable holes in
the upper and lower enclosures, and use screws to fix the cover plates.
Figure4-9 Cable holes
Figure4-10, Figure4-11, and Figure4-12 how to route trunk cables.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure4-10 Routing and binding trunk cables on the cable ladder
Figure4-11 Routing trunk cables upwards along the cable ladder
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
(1) Cable ladder (2) Trunk cable (3) Cable tie
Figure4-12 Routing signal cables from the cabinet to the cable ladder
The cabling should be neat, appropriate, and in accordance with the engineering
design.
The cabling should be clear, proper, and smooth at the bends. The cables are laid in
parallel.
The cabling should facilitate future maintenance and capacity expansion.
Requirements for the Binding of BSC Signal Cables
Bind signal cables separately from power cables. When signal cables are laid parallel
to power cables, leave a minimum distance of 10 mm [0.39 in.] between signal cables
and power cables inside the cabinet and a minimum distance of 100 mm [3.94 in.]
between them outside the cabinet.
If twines are used for the binding, wax the twines in advance.
Bind the signal cables at the entrance and the exit of the cable trough and at the
bends, as shown in Figure4-13. Do not bind the signal cables in the cable trough.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Figure4-13 Binding signal cables
Bind optical cables in pairs at intervals of 150 mm [5.91 in.]. Cover the optical cables
outside the cabinet by using corrugated pipes.
Bind the cables that are routed on the cable rack and bundle them neatly.
Reserve extra lengths of the signal cables near connectors for the convenience of
inserting and pulling the connectors.
Point the tips of the cable ties to the same direction, and bind the signal cables with
proper tightness. For indoor cable ties, cut off the surplus part completely. For
outdoor cable ties, leave an extra length of 3 mm [0.12 in.] to 5 mm [0.20 in.].
Arrange the cable ties evenly. For the trunk cables outside the cabinet, it is
recommended to bind them at an interval of 1,000 mm [3.28 ft]. For the trunk cables
inside the cabinet, it is recommended to bind them at an interval of 150 mm [5.91
in.] to 200 mm [7.87 in.]. For Ethernet cables, it is recommended to bind them at an
interval of 70±5 mm [2.56 in. to 2.95 in.].
4.5 Requirements for the Clock of the BSC
This topic describes the requirements for the clock resources of the BSC.
4.5.1 Clock Resources of the BSC
The clock resources of the BSC are BITS clock signals, line clock signals extracted from the
A interface, satellite synchronization clock signals, and board free-run clock signals.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
BITS Clock Signals
The BITS clock signal is obtained by the BSC from the BITS clock device. There are three
types of BITS clock signal: 2 MHz clock signal, 2 Mbit/s clock signal, and 1.5 Mbit/s clock
signal. The BITS clock signal has two input modes: BITS1 and BITS2. The BSC obtains the
clock signal through the clock input port on the GCUOa.
NOTE:
The 2 MHz clock signal and 2 Mbit/s clock signal are E1 clock signals. The 1.5 Mbit/s
clock signal is a T1 clock signal.
BITS1 and BITS2 maps to the CKLIN0 port and the CLKIN1 port on the GCUOa
respectively.
Line Clock Signals
The 2.048 MHz line clock signals extracted by the EIUAa, OIUAa, PEUAa, POUAa, or
POU1Aa from the A interface are used as the clock reference source of the
GPS Satellite Synchronization Clock Signal
The GPS satellite synchronization clock signal is 1 pulse per second (PPS) signal extracted
by the BSC from the GPS satellite system. The BSC can receive clock signals from the GPS
satellite system through the satellite antenna port on the GCUOa.
Board Free-Run Clock Signals
When BITS clock source and line clock source are unavailable, the BSC can use board free-
run clock signals.
4.5.2 Requirements for Clock Precision of the BSC
The specifications of the BSC clock signals are the clock precision, the pull-in range, the
maximum frequency offset, and the maximum initial frequency offset.
Table4-8 lists the requirements for clock precision.
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Table4-8 Requirements for clock precision
Item Specification
Clock precision ±4.6×10-6
Pull-in range ±4.6×10-6
Maximum frequency offset 2×10-8 per day
Maximum initial frequency offset 1×10-8
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter5 Checklist for BSC Site
Preparation
5.1 Checklist for the Site Location
Item Requirements Specifications Result
Site
location
Keep the site away from the environments with high
temperature, poisonous gases, flammable or
explosive objects, electromagnetic interference
(radar station, radio station, and electric substation),
and unstable voltage.
Good
The site must be located away from pollution
sources, such as frequent earthquakes and strong
noise. While designing the project, consider
hydrographic, geological, seismic, power supply, and
transportation factors. Select a site that meets the
engineering and environmental requirements for the
telecom equipment.
Good
The site should not be located in an area that is near
the sea. The minimum distance from the seaside is
500 m [0.31 miles].
Good
The site must be located away from water bodies.
For example, the site should be located at a place
that is higher than the sea level.
Good
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
5.2 Checklist for the Equipment Room Environment
Item Requirements Specifications Result
Height Minimum height under the
beam
3 m [9.84 ft] to 3.5 m [11.48 ft]
Bearing
capacity
Bearing capacity of the
floor
Not lower than 450 kg/m2 [0.64
bf/in.2]
Wall Wallpaper or lusterless
paint
Difficult to be chalked
Floor ESD floor Semiconductor and dustless
Door and
window
The door is 2 m [6.56 ft]
high and 1 m [3.28 ft]
wide. One door panel is
enough.
Doors and windows are sealed with
dustproof plastic tape. Double-layer
glass is recommended for windows.
Groove in
the room
The groove is used for
routing various cables.
The inner side should be smooth
and conform to the requirements for
the transmission equipment layout.
Temperatur
e
Long-term working
temperature
0℃ to 45℃
Short-term working
temperature
-5℃ to +55℃
Humidity Long-term working
humidity
5% to 85%
Short-term working
humidity
5% to 95%
Anti-EMI Electric field Not more than 300 mV/m
Magnetic field Less than 11 Gs
ESD ESD floor The volume resistivity should be 1.0
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Item Requirements Specifications Result
protection x 107 ohms to 1.0 x 1010 ohms.
5.3 Checklist for the Power Supply System
NOTE:
Before checking the power supply system, ensure that the cabinet is grounded.
Item Requirements Specifications Result
Voltage of the DC
power supply
The primary power
supply and the
storage battery work
in the mutual hot
backup mode.
The voltage ranges
from -57 V DC to -
40 V DC.
Standby generator A standby generator
is recommended.
Good
Voltage of the AC
power supply
187 V AC to 242 V
AC
Good
Routing of power
cables
The –48 V power
cables should be led
to the power
distribution cabinet
or power distribution
box.
Good
Alarms for power
supply
Alarms are
generated when the
power supply is
disconnected or
faulty.
Good
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
5.4 Checklist for the Grounding Cables
Item Requirements Specifications Result
Main grounding bar
and branch
grounding bar
The distance between the copper
bar and the copper wires should
be as short as possible. The
grounding cables should be as
thick as possible.
The installation is
complete and the
grounding cables are
in good contact.
Grounding resistance Integrated grounding The grounding
resistance is less than
or equal to 10 ohms.
Grounding cable
entrance
The grounding cables should be
led to the power distribution
cabinet or power distribution box.
Good
5.5 Checklist for the Transmission System
Item Requirements Specifications Result
Trunk cables The trunk cables should not be arranged overhead.
If the trunk cables have to be arranged overhead,
they should have double shielding layers or metallic
sheath. The shielding layers or metallic sheath
should be securely connected to the grounding
bars.
Good
ODF The optical transmission system is ready for use.
The ODF or fiber distribution box is installed.
Optical fibers are interconnected.
Good
Transmission
system
The transmission system should be already tested
and meet the engineering requirements.
Good
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter6 Physical and Electrical
Parameters of CDMA BSC
Switching Equipment
6.1 Structure Specifications
Item Specification
Cabinet specifications The structure design complies with the IEC 60297 standard
and the IEEE standard.
Dimensions of the N68E-22
cabinet
2200 mm [86.61 in.] x 600 mm [23.62 in.] x 800 mm [31.50
in.]
Dimensions of the N68-21-N
cabinet
2133 mm [83.98 in.] x 600 mm [23.62 in.] x 800 mm [31.50
in.]
Available clearance inside the
N68E-22 cabinet
46 U
Available clearance inside the
N68-21-N cabinet
44 U
Weight of the N68E-22 cabinet Fully configured cabinet: ≤ 350 kg [771.60 lb]; empty
cabinet: ≤ 140 kg [308.64 lb]
Weight of the N68-21-N
cabinet
Fully configured cabinet: ≤ 410 kg [903.88 lb]; empty
cabinet: ≤ 170 kg [374.78 lb]
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
6.2 Electrical Specifications
Item Specification
Lightning
protection
±4000 V, 8/20 μs
Working voltage DC power supply: –48 V DC
Range: –40 V DC to –57 V DC
Power
consumption
Power consumption of the entire cabinet: ≤ 8200 W
6.3 Specifications for GPS feeders and jumpers
Distance Between the Satellite Antenna
and the Main Devices
Specifications for GPS Feeders and
Jumpers
< 100 m [328.08 ft.] 1/2'' jumper
100 m [328.08 ft.] ≥ L (the length) < 300 m
[984.25 ft.]
7/8'' feeder
≥ 300 m 5/4'' feeder
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
Chapter7 Physical and Electrical
Parameters of M2000 OMC
Equipment
Equipment
Type
Equipment
name
Physical specifications
(single cabinet)
Electrical specifications (single
cabinet)
Dimensions
(mm)
(WidthDept
hHeight)
Weight
(kg)
Current
(A)
Voltage
(V)
Power
consumption
(W)
(Fully
equipped)
M2000Server
cabinet
610 930
1870
159
(empty
cabinet)
10220 - 240V
AC
600 800
2100300 10 -48V DC
Alarm boxGM12 alarm
box
400 100
280/ 0.75
-48V DC or
220V AC40
M2000
maintenance
equipment
ClientAs large as a
PC/ 1.36 220V AC <400
Alarm
console
As large as
a PC/ 1.36 220V AC < 400
Dialup
server
As large as
a PC/ 2.27 220V AC 500
M2000 server Sun server
E4500
340 500
56068 12
100 -
240V AC1400
Sun server
Blade 1000
256 610
455
31.8 4 100 -
120V AC
220 -
390
A maximum of
875 W
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Preparation Guide to CDMA2000 BSC6680 Engineering Installation Customer
240V AC
Sun server
Netral 1405
(dual
nodes)
/ 220V AC 1600
Router
Cisco3640 445 400 87 13.6 –100 - 240V
AC140
Quidway25
01
445 268
445 1.5
100 -
240V AC20
Quidway26
31
442 210
458 –
85 -
264V AC70
LAN switch
Catalist2950 /100 - 240V
AC35
Quidway30
26
436 338
43.54 –
90 -
264V AC60
Timeslot
cross-connect
equipment
Mercury36
00
430 330
443 –
90 -
240V AC35
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