Core Basis (Coba2P8); Fig. 3.2 Coba2P8 Block Diagram - Siemens BS-240 Technical Description

Information
Base Station System
i
3.1.1
SESA
SMC2
OASI SMC1
SMC4
RDL
SMC3
TPC
SMC2
LMT/OTP
LAPD TSA-SCC1
SRAM
16MB
DC/DC Converter
A30808-X3247-L14-2-7618
HW inside the Rack is disturbed (no loss of data on other boards) or a board is
destroyed.
A COBA-board can only be pulled out, if before the COSA-board is pulled out
After plug-in of a Core-board, this board is in the reset-state and all bus-drivers of
external busses are in tristate. These drivers shall be enabled not before initialization of
the devices, which serve the external busses.

Core Basis (COBA2P8)

The COBA is the central board of the core. The functionality of the advanced clock
generation (ACLK) and the base core controller (BCC) of the entire BTSE are inte-
grated. Additionally two PCM30/24 Abis-interfaces are available on the COBA2P8.
The controller maintains the SW of all BTSE units in FLASH-EPROMs, supervises the
SW download and terminates all internal system alarms. Beside the O&M functions the
controller handles the signalling messages between BSC (Abis) and CUs (CC-Link). For
interface and feature extensions the COBA can be expanded with one satellite (COSA).
To fulfill the CORE redundancy aspects, the COBA board with its satellite COSA board
can be duplicated. In this case, one CORE (COBA+COSA) is "providing service" and
works as the master and the other CORE is "cold standby" or is "disabled" if HW prob-
lems have occurred. The redundancy switch is controlled by the COBA board. Special
links are provided for information exchange between the two board sets.
BCC
SIU
FLASH
3 X 8MB
WATCH
RDL
LOGIC
DOG
CAN-BUS, ALARMs
Fig. 3.2 COBA2P8 Block Diagram
The ACLK generates the system specific timing signals which are distributed by SELICs
to the CUs. Fig. 3.3 shows the structure of the ACLK function.
ACLK
CAN
I/O
EEPROMs
MUX
A/D-Conv.
LEDs, Redundancy Control,
CU_DC_OFF ect.
Technical Description (TED:BSS)
SELIC
SELIC
SELIC
SELIC
SELIC-BUS
Abis1
Abis2
BISON
BISON-BUS
Route clock
ext CLK sync
BS-240/241
CU
CU
CU
CU
CU
CU
CU
CU
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