Fig. 3.1 Backplane Slot Configuration Of Core - Siemens BS-240 Technical Description

Technical Description (TED:BSS)
BS-240/241
26
OVPT
Backplane
COBA
COSA
2 Abis 6 Abis
16
8
SELIC
SELIC
Fig. 3.1 Backplane Slot Configuration of Core
For a configuration with less or equal 2 PCM30/24-interfaces and no Extension Rack
one COBA-board is required. The second slot can be used (by adding 1 COSA Board)
for an expansion of the BTSE up to 8 Abis and 24 CU-interfaces or it can be used for
future expansions, e.g. a GPS-Receiver for synchronization, better frequency-standards
or other Abis interfaces than PCM30/24 (e.g., SDH, ATM).
The connection of Abis and CU-interfaces of the Core to the OVPT/Abis-interface and
the CUs is done via cables, which are plugged into the backplane.
The CU-interfaces of the Core and its redundancy are routed with separated wires via
the backplane and cables to the CUs (2 interfaces on one CU required).
The Abis interface ports of the Core and its redundancy ports can only be switched to
the same wires. Only one transceiver at the same time is allowed to be switched to the
same wires (no simultaneous transmitting/receiving of Core and its redundancy on the
same Abis-port possible).
To find the physical place of a Abis-interface/CU out of the logical/memory-map
address, appropriate configuration-rules are created and considered.
Two Core-boards, COBA2P8 (see section 3.1.1) and COSA6P16 (see section 3.1.2),
are developed. The first digit gives the number of Abis-Interfaces, the following letter the
kind of Abis-interface (e.g. P for PCM30/24), and the following number the number of
CU-interfaces, e.g., COSA6P16 (6 PCM30/24 Abis-interfaces, 16 CU interfaces).
Hot Plug-in: A Hot Plug-in of the Core-boards (COBA and COSA) is possible. This
means, that these boards can be plugged in/out with voltage switched on and no other
Base Rack
CU
.
COBA red. COSA red
6 Abis
2 Abis
16
8
SELIC
SELIC
Information
Base Station System
Extension Racks
CU
CABLES
Plugs
Abis
CUs
8
8
8
other
interfaces
A30808-X3247-L14-2-7618