Channel Distribution Function
03_0301A
RBS 1
RBS 2
PCM
A
PCM
B
PCM
B
PCM
A
TS
1
2
3
4
5
6
7
Figure 45 Multidrop example
All timeslots, not used by the own RBS, are transparently connected
between PCM-A and PCM-B.
The timeslots used by the RBS will be connected from PCM A to the
respective destination in the RBS. These timeslots will have valid idle
pattern transmitted on PCM B and incoming data on PCM-B is ignored.
The RBS located at the end of the linear cascade chain transmits idle
pattern on all time slots not dedicated for the RBS itself on PCM-A
output.
• When entering at least one of the alarm states LOF, LOS or AIS
at PCM-B input, the RBS is considered to be the RBS located at
the end of the linear cascade chain, presuming that PCM-A is not
in loop mode. It is considered to be so until the alarm state is left.
• When entering loop mode (Line loop back or Payload loop back)
at PCM-B, the RBS is considered to be the RBS located at the
end of the linear cascade chain, presuming that PCM-A is not in
loop mode. It is considered to be so until the loop mode on
PCM-B is left.
• When entering and leaving alarm states, the Alarm Filtering Time
(AFT) is used.
• When entering and leaving loop modes AFT is not used.
The multidrop function is terminated when the parameter Network
Topology is set not to indicate multidrop.
EN/LZT 123 2697 R5A
1998-08-13
225 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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