Copy of BSS Pressentation

8/13/2019 Copy of BSS Pressentation

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MOTOROLA BSS Training Course

Prepared by

Eng/ Sameh Ahmed Emam


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Base Station System Control (BSSC) Cabinet

A BSSC cabinet can be configured as;

1- A Base Station Controller (BSC) containing digital hardware modules

configured to control the radio subsystem.

2- A Remote Transcoder (RXCDR) containing digital hardware modules

configured to provide an interface between the BSC and Mobileswitching Centre (MSC).


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1- BSU and RXU shelve (up to two per cabinet);

- A backplane.

- Two vertical slot module shelves (full size digital modules and half

size digital modules).- A three compartment shelf (Power Supply Modules).

- Cooling Fans.

BSSC Cabinet Internal Components

2- Power Distribution Board.

3- Distribution Alarm Board.


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Power Supply Modules

The Integrated Power Supply (IPS) system for each BSU or RXU in a

positive earth (48 V/60 V) system consists of up to three plug-in

Integrated Power Supply Modules (IPSMs). The IPSM can only be used in

positive earth cabinets.


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BSU shelve


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RXU shelve


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BSSC interconnect panel


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Bus Termination Card (BTC)

1- Provides the terminations necessary for all of the signals on the BSU

or RXU backplane.

3- Fitted in slot L 0 and slot L 28.

2- Required due to the high speed buses contained in the backplanes.


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The Generic Processor (GPROC) Board

1- Provides the processing power to control a BSC, RXCDR.

3- Communicates with other full-size modules via the MCAP bus.

2- Its function and task depending upon the software loaded into it

- Base Site Control Processor (BSP). - Link Control Function ( LCF ).

- Operations and Maintenance Processor (OMF).

4- Fitted in slot L18 to slot L 25 in BSU (must be fitted in slot L 20 and L 24

for use in initialization BSU and L 25 and slot L 26 in an RXU).


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Multiple Serial Interface (MSI)

1- The interface between the intersite communication lines and the TDM

highway.2- Extract the clock synchronization data from the E1(European 2.048

Mbit/s) line data stream in order to phase lock the GCLK to the line.

5- Fitted in Slots L 6 to L17 of the BSU and Slots L6 to L10 of the RXU.

4- Must be fitted in shelf 0 in slot L16, slot L14 or in shelf 1 in slot L 16 for

BSC initialization purposes but for RXU initialization uses slot L10 instead

of slot L16, and slot L 8 instead of slot L 14.

3- Drive two European 2.048 Mbit/s (E1) data lines


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The Generic Clock (GCLK)

1- Generates all the timing reference signals that the BSU or RXU

requires

2- Fitted in slots L3 and L5 in the BSU and RXU. The module is two

slots wide and covers L2/L3 and L4/L5


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The Kiloport Switch (KSW)

1- A time division digital switch.

2- Switch data to and from highway interface modules (MSIs).

3- Fitted in slot L 1 and L 27.


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Non Volatile Memory (NVM)

1- Full height digital board, designed for installation in the BSU cage 0

of a BSC, or the RXU cage 0 of the RXCDR

3- The NVM board must be installed in slot L 26 in the BSU cage 0

(master) of the BSC and in slot L 24 (GDP 0) in the RXU cage 0

(master) of the RXCDR

2- If an NVM board is installed, data is retrieved from the NVM board

rather than from the OMC-R during recovery from a total power loss


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The Generic DSP Processor (GDP)

1- Provides the transcoding interface to the MSC

4- Fitted in slot L8, L9 and from L11 to L 24 for 8 Ater configuration (from

L11 to L24 for 14 Ater configuration

3- Contains a digital signal processor (DSP) unit that performs

- Speech encoding - speech decoding

- Submultiplexing functions

2- Each GDP supports thirty compressed voice and data channels

(GDP2 support 60-channel)


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Local Area Network Extender (LANX)

1- Connects one of the LAN interfaces of each GPROC in a BSU

or RXU shelf to the local shelf token ring LAN via the shelf

backplane

2- Shelf to shelf extension is via a LANX module in each shelf,interconnected with fiber optic cabling3- LANX supports up to eight GPROC/GPROC2s on the local

LAN in one BSU or RXU shelf.

4- Fitted in slots U19 and U20


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LANX Extension (4 cages)

A sixteen position (0 to F hex) rotary switch on the LANX module

sets the BSU or RXU LAN address (shelf ID number).


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The Kiloport Switch Extender (KSWX)

1- Used when the number of required peripherals exceeds the capacity of

a BSU or RXU shelf

2- In expansion mode (KSWXE) connects the KSW to the KSW in a remote

BSU or RXU

3- In local receive mode (KSWXL) distributes clock and reference signals

received from a CLKX (KSWXL modules are optically connected to CLKX

modules).

4- KSWXE must be fitted in slots U7 to U9 and U21 to U23 and KSWXL

must be fitted in slots U0 and U1 of the BSU or RXU shelf


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The Clock Extender (CLKX)

2- The extended clock signals are received by a KSWXL in the remote

BSU/RXU

1- Distributes the clock and reference signals generated by the GCLKin the parent shelf to all other shelves at a site

3- Fitted in slots U2 to U7 of the BSU or RXU shelf


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The Parallel Interface Extender (PIX)

1- Provides an input/output (I/O) interface for customer site equipment

2- Provides the interface logic between the GPROC and external

customer alarm devices such as relays and switches.

3- Fitted in U16 and U 17.


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Signaling Interface Interconnections (RXCDR/BSC/BTS)

Transcoder Base Site Link (XBL)

1- Optional link for control and communications between the RXCDR and BSC

2- The XBL provides two-way communication between the master processor in

the BSC and the master processor in the RXCDR.

3- The XBL enables the RXCDR to report failed traffic circuits at the RXCDR to

the BSC

Radio Signaling Link (RSL)

1- This link exists between the BSC and the BTS2- Provides support for the call processing software at the BTS

3- Allowing the BSC to send and receive control information

4- Provides support Statistic collection and fault reporting


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Operations and Maintenance Link (OML)1- Control and communications between the BSS and OMC

2- OML links from BSCs are normally nailed through the RXCDR, and

OML links from the RXCDR are direct to the OMC

3- OML used for load software and Fault / event management

Message Transfer Link (MTL)

1- This link exists between the BSC and MSC

2- Provides all control information between the BSCMSC

3- Provides all control information between the MSCMS including

Requests for initial connection and Handling handovers


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Shelf Internal Connections

2- Motorola Cellular Advanced Processor (MCAP) bus

- Provides the GPROCs within the shelf to monitor and control all

the other full size cards, except other GPROCs

1- Time Division Multiplexed (TDM) highway

- used to pass call and signaling data from the BTS to the MSC andvice versa

4- Serial bus

- Interfaces the DAB, PSMs and the Half size cards to the GPROCsfor control and monitoring purposes

3- Local Area Network (LAN)

- The LAN allows all GPROCs to communicate to each other via a

dedicated high-speed bus.

Prepared by

Eng/ Sameh Ahmed Emam

Copy of BSS Pressentation

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