Alcatel-Lucent 1643 AMS User's Operation Manual page 557

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Port names
The name of the physical ports consist of two parts separated by a dot. The first part is
related to the slot name, the second part is the port number within that slot.
Example: LP2.1, TP1.3
The name of the logical ports consists of the physical port name followed by the AU-4
number and for low order signals, the VC number (VC-12 or VC-3). The VC number
consists of:
• the number of the TUG-3 inside the VC-4
• the number of the TUG-2 inside the TUG-3
• the TU-12 number inside the TUG-2.
Test loops
An incoming test loop can be set on the 1.5 Mbit/s, 2 Mbit/s, 34 Mbit/s, 45 Mbit/s,
and X.21 ports. The input signal is directly routed back to its corresponding output
without altering the signal format. This loop can be used to test the connectors. Only
one inloop can be set at the same time.
An outcoming test loop can be set on the 1.5 Mbit/s, 2 Mbit/s, 34 Mbit/s, 45 Mbit/s,
and X.21 ports. The output signal is directly routed back to its corresponding input
without altering the signal format. This loop can be used to test how the signal passes
through the system.
If a testloop is enabled, the
cross connections that existed before setting the testloop are restored.
Setting a testloop is achieved by making a unidirectional cross-connection. The
termination points of the source and the sink are the same. Setting testloops in only
possible on VC-3 and VC-12 level.
The following figure shows test loops for physical ports of Tributary Port Units.
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Issue 4, May 2007
state is activated. After disabling the testloop the
Abnormal
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Port types
9-5