Post on 14-Apr-2018
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GSM BTS312
Hardware Structure
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Location
MS: Mobile Station BTS: Base Transceiver Station
OMC: Operation and Maintenance Center
HLR: Home Location Register EIR: Equipment Identity Register
MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center
VM: Voice Mailbox
BSC: Base Station Controller
AUC: Authentication Center
PSTN
ISDN
PSPDN
Um Interface
BTS
BTS
BTS
BTS
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAPMAP
TUP,ISUPMS
MS
MS
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Features and Functions
High integration and low power consumption
15 radio carriers at the Abis sharing an E1 for
transmission (15:1)
Support various transmission modes and complex
topologies,
e.g. SDH, E1, microwave, satellite etc.
Support the configuration of up to S24/24/24 and
facilitating expansion
1-minute fast startup
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Features and Functions
Support
GSM900,DCS1800,EGSM and
RGSM
Support GSM PHASE 1PHASE
2 and PHASE 2+
Support GPRS and EDGE
Support baseband hopping and
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Boards in Cabinet:
CDU: Combiner & Divider Unit
TRX: Transceiver
PMU: Power Monitoring Unit
TMU: Timing/Transmission &
Management Unit
PSU: Power Supply Unit
TDU: Time Distribution Unit
TES: Transmission ExtensionPower Supply Unit
TEU: Transmission Extension
Unit
Cabinet and Boards
FAN BOX
SWITCH BOXFAN BOX
AIR BOX
AIR BOX
PSU
PSU
PSU
PSU
PSU
PSU
PMU
TMU
TES
TEU
TMU
TEU
TRX
TRX
TRX
TRX
CDU
CDU
TRX
TRX
TRX
TRX
CDU
CDU
TRX
TRX
TRX
TRX
CDU
CDU
TDU
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Chapter 1 Overview
Chapter 2 System Components
Chapter 3 Signal Processing
Chapter 4 Antenna and Feeder System
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Chapter 2 System Componnents
Section 1 Common Unit
Section 2 Signal Processing Unit
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TMU
Provide E1 connection interface
Provide channel multiplexing and flexible
networking modes
Provide Man-machine interface (MMI) and
operation & maintenance link
Provide centralized BTS clock
Provide alarm signal input ports
Functions of TMU
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Indictors on TMU
IndicatorName
Color Meaning Explanation Normal State
PWR Green PowerOn: Normal
Off: AbnormalOn
RUN Green Running StateFlash(0.5Hz): Normal
On or Off: AbnormalFlash
LI1,2,3,4 GreenE1Transmission
On: Local Alarm
Flash: Remote AlarmOff: Normal
Off
M/S GreenMaster/Slaveindication
Slow flash(1HZ): Master
Quick flash(2Hz): Slave
Master Board:Slow flash
Slave Board: Quickflash
PLL Green Phaseidentificationindicator
On: Free oscillation
Quick flash(4Hz):Catching
Slow flash(1Hz): Locked
Off: Abnormal
Slow flash
TMU
MMI
T13M
FCK
T2M
DBG
RST
PWR
M/S
RUN
LI1
LI2
LI3
LI4
PLL
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TDU
Provide clock channels in one synchronous
cell
Transfer E1 signals in the local cabinet
Provide alarming channels
Provide bus-control interfaces
Functions of TDU
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Power Supply System
AC/DC
(DC/DC)module
Monitoringunit PMUAnti-lightning
Power
distribution
EMIfilter
DC contacter
Battery group Fuse
220VAC IN-48VDC IN+
-
+24VDC IN+- 26VDC OUT
Load
EMIfilter
AC/DC
(DC/DC)module
AC/DC
(DC/DC)module
AC/DC
(DC/DC)module
EMIfilter
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PSU Configuration
modeCapacity
(TRX)Boards(PSU)
Boards(PMU)
notes
24VDC 1 ~ 12 0 1
-48VDC 1 ~ 3 2 1
One PSUfor
backup
4 ~ 6 3 1
7 ~ 9 4 1
10 ~ 12 5 1
220VAC 1 ~ 3 3 1
4 ~ 6 4 1
7 ~ 9 5 1
10 ~ 12 6 1
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PMU structure
PMU
AC/DC AC/DC AC/DC
AC power supply
Power monitoring
unit PMUFanFuseBattery
Load
AC/DC
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FMU
Fan feeding
Fan revolution speed control
Alarm detection
+24V power supply input
interface
Functions of FMU
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TRX
Baseband speech processing
Um and Abis interface signaling
processing Modulation and demodulation
RF signal amplification
Functions of TRX
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CDU
Combine and filter transmitted
signals
Filter ,amplify and distribute received
signals
Provide power for the tower-top
amplifier
Alarm detection
Functions of CDU
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Alarm Detection
VSWR (Voltage Standing Wave
Ratio) monitoring: CDU Monitors
the status of antenna system.When the detected standing
wave ratio exceeds the preset
threshold (1.5 or 2.5), CDU will
generate corresponding alarms
Low noise am lifier fault alarm:
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Antenna and Feeder System
Antenna
TTA
Antennastand
Jumper betweenantenna and TTA
Jumper betweenTTA and feeder
Feeder
Lighteningarrester
Jumper betweenlightening arresterand cabinet
BTS312
cabinet
SWITCH BOX
FAN BOX
AIR BOX
P
S
U
P
S
U
P
S
U
P
S
U
P
S
U
P
S
U
P
M
U
T
M
U
T
E
S
T
E
U
T
E
U
C
D
U
C
D
U
T
R
X
T
R
X
T
R
X
T
R
X
C
D
U
C
D
U
T
R
X
T
R
X
T
R
X
T
R
X
C
D
U
C
D
U
TDU
FAN BOX
AIR BOX
P
S
U
P
S
U
P
S
U
P
S
U
P
S
U
P
S
U
P
M
U
T
R
X
T
R
X
T
R
X
T
R
X
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Lightning Arrester is used to
prevent the equipment from
being damaged by the
lightening current inducted
by the core line of the feeder
feeder
jumper
Lightning Arrester
Lightning Arrester
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Types of Main Feeder
7/8 inch
Cable loss=0.043dB/m
5/4 inch Cable loss=0.032dB/m
1/2 inch jumper Cable loss=0.11dB/m
Used between the antenna and the
main feeder
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Antenna Pattern
The antenna pattern describes theradiating abilities of antennas in alldirections
360
Omni Antenna Directional antenna
120 90 65
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Polarization
Two main types of polarization
Vertical polarization
Horizontal polarization
The types of antenna divided by polarization
Single polarized antenna
Vertical polarization for GSM
One port for one feeder
Dual polarized antenna
+45 degree and -45 degree
Two ports for two feeders
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