Channel Distribution Function
35.3.5 Multidrop bypass
This function is only valid if it is supported by the hardware.
The function handles transparent connection from PCM-A to PCM-B
during such times that normal multidrop function is unavailable. This
can be due to:
• Power off
• Fatal software fault
• Fatal hardware fault
• Reset button on CMRU is pushed
• BSC ordered reset
• Replacement of RBS
The multidrop connected RBSs are connected so that each RBS
uses its port A towards the BSC and port B towards the next
RBS. The latter RBS is connected in the same way with port A
towards the previous RBS, port B towards the next RBS, and so
on. Figure 46 on page 226 illustrates the case with two RBSs and
with the first RBS in bypass mode.
04_0301A
BSC
RBS 1
CMRU
A
B
RBS 2
CMRU
A
B
Figure 46 Linear Cascade connection with bypass
When switching to and from bypass mode, a disturbance will occur on
the PCM line.
226 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
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