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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 15 Diagnostic Tests
PSTN Trunk Testing
107 Test Line–Data Transmission
The data transmission test line supports 1-way testing of certain voice band data parameters. This
includes peak to average ratio signal (PAR), slope, quiet termination, and intermodulation distortion test
signals.
It should be noted that newer test equipment, like the SAGE 930/935, provides these and other voice
band data tests for
both
directions makes it possible to use one test line to evaluate voice and voice band
data performance.
108 Test–Digital Loopback
The 108 test line supports testing by means of a digital loopback. The T108 test line feature determines
the performance of trunks connecting digital exchange switches, including voice over packet (VoP)
softswitches. BTS 10200 incoming trunks requesting other 1xx-type test lines are routed to shared test
lines for the requested tests, regardless of which gateway terminates the trunk or which gateway/IAD
terminates the test line. The T108 test line feature requests a test to be performed within the same
gateway where the trunk under test (TUT) is terminated, and provides a digital loopback within the
gateway. The T108 test line feature supports manual and automated testing.
The T108 test line sequence is as follows:
1.
The near-end switch originates the test sequence by placing a test call, identifying the trunk to be
selected, and the test line number. A digital test pattern generator is used in the test setup shown in
.
2.
The near-end switch uses the trunk identifier to override normal call processing and select only the
requested trunk.
3.
The far-end switch responds to the destination number and connects to the T108 test line. The T108
test line enables a digital loopback.
4.
When the near-end switch receives answer supervision, it conducts digital test sequences to
ascertain trunk performance.
5.
Once the test sequences are completed, the near-end switch releases the test call and both switches
release the trunk connection.
6.
The far-end switch can detect if the test connection exceeds a preset time and releases the test
connection if the preset time is exceeded.
The T108 test line is also used for trunk redirection (wholesale dial) for Internet services where the
carrier modem termination is integrated into the trunk gateway. In this case, the integral digital stored
program (DSP) normally supports modem-only transmissions.
109 Test–Echo
The 109 test line supports in-service testing of echo cancellers or echo suppressors.