26
A30808-X3247-L14-2-7618
Technical Description (TED:BSS)
BS-240/241
Information
Base Station System
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
) and COSA6P16 (see section
),
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
CABLES
2 Abis
6 Abis
COBA
COSA
COBA red.
COSA red
.
2 Abis
6 Abis
Abis
16
8
16
other
interfaces
Backplane
Plugs
Extension Racks
CUs
CU
OVPT
8
8
8
Base Rack
CU
SELIC
SELIC
SELIC
8
SELIC
