Channel Distribution Function
Table 26 ICPs ranges 512 – 575 and 640 – 711
TRX Signalling Traffic
0 512-515 516-523
1 524-527 528-535
2 536-539 540-547
3 548-551 552-559
4 560-563 564-571
5 572-575 576-583
6 640-643 644-651
7 652-655 656-663
8 664-667 668-675
9 676-679 680-687
10 688-691 692-699
11 700-703 704-711
35.3.1 Concentration of LAPD signals
The purpose of LAPD concentration is to reduce the number of required
physical links between the BSC and the BTS. This is done by allowing
a number of TRXs to use the same physical transmission link for LAPD
signalling between the BSC and the BTS.
The function concentrates LAPD messages from a number of TRXs
onto one physical link to the BSC (uplink). It also deconcentrates
LAPD messages received on one physical link from the BSC
(downlink), sending them forward to their destinations.
01_0301A
(TeI1, TEI2, ... TEIN)
TRX
BSC
Channel N (TEIN)
TRX
TRX
Channel 2 (TEI2)
Channel 1 (TEI1)
Concentrated
signalling channel
Non-concentrated
signalling channels
CON
Figure 42 One N:1 concentrator Connection Group (CG)
Messages are sent forward to their destinations without adding, deleting
or changing information.
The concentrator is configured by A-bis commands as described in
chapter "Functionality Administration".
For each concentrated signalling channel there is a transmit queue for
uplink messages to the BSC. The queue length is supervised as
described in "Self Test and Supervision". If a new message is received
220 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
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