
Chapter 18 493
T1 Analyzer
Making T1 Measurements
constant state. The text on the button changes to reflect the appropriate action.
• Loop Up/Loop Down: Available in emulate mode, these buttons enable you to
manually put the test set into either loop up or loop down mode.
• Send Loop Up/Send Loop Down: Available in emulate mode, the Send Loop
Up button sends a loop up command to the far end. Send Loop Down sends a
loop down command to the far end.
Sample Hard Loop/End-End Full T1 BERT Test
Use this test mode to perform measurements, such as BERT, on a known test pattern
being sent from the far end. The far end signal can be generated by looping back the
transmitted signal from this test set or by a second test set. To use this test, have
someone at the far end manually loop-up the equipment or generate a known pattern
with a far end test set. Since a pattern is being sent on the T1 line, service on the T1
will be affected.
This example explains how to setup a hard-loop/end-end full T1 BERT test. A hard
loop test requires one test set at one end and a hard loop at the other. An end-end test
requires a test set at each end but enables the troubleshooter to identify the direction
of the trouble. The T1 circuit is not available for service when using this test mode.
During the commissioning or startup phase of a T1 circuit, a several day end-end or
hard loop test is often performed. This type of test provides the most comprehensive
level of information but does require the circuit to be taken out-of-service for the
duration of the test. The test results provide more granular resolution on root cause
problems than a monitor test.
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