Reference Manual

Channel Distribution Function

PCM

RBS 1

RBS 2

Figure 148 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 (DXX line loop back) at PCM-B, the RBS

transmits idle pattern on all timeslots not dedicated for the RBS itself

on PCM-A output presuming that PCM-A is not in loop mode. Idle

pattern is transmitted until the loop mode on PCM-B is left.

When entering loop mode (DXX line loop back) at PCM-A, idle pattern

is transmitted on PCM-B output presuming that PCM-B is not in loop

mode. Idle pattern is transmitted until the loop mode on PCM-A is left.

Idle pattern is not transmitted on timeslot for the TN O&M channel.

The function is terminated when the parameter Network Topology is set

to not indicate multidrop.

56.3.5 Remote OMT Link

The function is initiated during restart of CMRU.

444 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary