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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 15 Diagnostic Tests
PSTN Trunk Testing
100 Test–Balance
The balance test is normally used for two-wire switches to ascertain the performance of the four-wire
terminating set “4WTS” or hybrid. Improper options or equipment faults can cause the trunk to sound
hollow or have an echo.
This test can also be used to determine the far to near loss of the trunk under test, in some cases, as well
as the far to near noise.
When called, the far end test set will either immediately answer with a quiet termination (silence) or
provide a milliwatt test tone for a brief period.
101 Test–Communications and Test
This test supports testers to evaluate the TUT by actually talking over it. Normally, the test line is routed
to a test position. It also supports manual or specialized testing across the TUT.
102 Test–Milliwatt
The milliwatt test provides a test tone throughout the test. Periodically, the tone may be removed
automatically by the far end test set for a brief period of approximately 1 second in every 10 seconds.
This helps failed T1 lines to regain frame synchronization and may also be used for other purposes.
This test may be used to determine the far to near loss and/or C-Notched noise of the trunk under test.
It may also be used for other far to near test purposes.
103 Test–Signaling and Supervisory
The 103 test provides a connection to a supervisory and signaling test circuit for overall testing of these
features on intertoll trunks equipped with ring forward.
104 Test–2-Way Test
Supports far to near and near to far evaluation for the TUT. The operation is very simple with the far end
test equipment proceeding through a specific sequence of test steps.
The 104 test supports 2-way transmission testing and 2-way noise checking.
105 Test–ROTL/Responder
This is the preferred test line as it supports many tests for either the near to far or far to near direction.
The near end test equipment is normally able to communicate with the far end test equipment to set up
and conduct specified tests.
For example, the SAGE 930/935 test sets provide a robust menu of tests that include phase hits, jitter,
and nonlinear distortion.
The 105 test line is normally used by CAROT and other automated trunk test systems as the far end test
line. In CAROT terms, this is commonly called the responder.
