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
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