Management
Line Loop Loops an incoming line signal back to its origin. The loop is
done in the plug-in unit, close to the line interface, see Figure
85 on page 107. An AIS is sent to the TDM bus.
ALineLoopincombinationwithaBERTinanadjacentNEis
used to test the transmission link between the two NEs.
In the MMU2 E/F STM-1 the traffic signal that shall be
transmitted is looped back just after base-band interface.
Local Loop
Loops a line signal received from the TDM bus back to its
origin, see Figure 85 on page 107. An AIS is sent to the line
interface.
A Local Loop in combination with a BERT in another NE can
be used to test a connection as far as possible in the looped
NE.
In the MMU2 E/F a Local Loop at the far end loops back the
STM-1 traffic at base-band level.
The following loop is only supported on the MMU.
Rx Loop
This loop is similar to the Connection Loop but the loop is
done in the plug-in unit close to the TDM bus, where a group
of E1s in the traffic connection is looped back to its origin,
Figure85onpage107.
An Rx Loop can be used on the far-end MMU to verify the
communication over the radio path, see Figure 86 on page
108.
In the MMU2 E/F the RX Loop applies to the wayside E1 traffic.
nxE1
Plug-in
Unit*
Plug-in
Unit
nxE1
7470
nxE1
Plug-in
Unit
Rx Loop
Connection Loop
AIS
AIS
AIS
Line Loop
Local Loop
TDM Bus
* Only MMU
Figure 85 Loops
107
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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