l Local loopback
l Remote loopback
Local loopback on the E1 port
Local loopback, also called inloop, is the loopback from the port processing module of the board
to the backplane. In the local loopback, the signals that are transmitted from the backplane to
the E1 port are directly sent back to the backplane to check whether the board that houses the
E1 port can communicate with the backplane normally. Figure 8-2 shows the local loopback on
the E1 port.
Figure 8-2 Local loopback on the E1 port
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Local loopback
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Remote loopback on the E1 port
Remote loopback, also called outloop, is the loopback from the port processing module of the
board to the line. In the remote loopback, the signals that are transmitted from the peer device
to the port processing module are directly sent back to the peer device to check whether the
board that houses the E1 port can communicate with the peer device normally. Figure 8-3 shows
the remote loopback on the E1 port.
Figure 8-3 Remote loopback on the E1 port
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Remote loopback
8.3 POTS Subscriber Circuit Line Test
The POTS subscriber circuit line test is used to test certain functions (such as ringing, power
feeding, and dialing tone) and parameters (such as feed voltage and ringing current voltage) of
the internal circuit of the board. The test result is used to locate faults.
SmartAX MA5612 Multi-service Access Module
Maintenance Guide 8 Common Operation
Issue 01 (2012-07-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
249
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