TESTING CONCEPTS AND RECOMMENDED TEST SEQUENCE
19
Testing Stages
When testing with the TALAN, there are different testing conditions that must be considered. We
have defined these conditions as test stages and they are:
1. On-Hook Test Stage
2. Off-Hook Test Stage
3. Phone Disconnected Stage
4. Open Circuit Stage
5. End-of-Line Stage
It is not necessary to conduct all possible tests in each of these test stages; therefore we have
provided a description and benefit for each of these stages.
1. On-Hook Test Stage
Handset on hook, TALAN in line with phone set.
No audio should exist on any pair.
Characterize system parameters such as voltage.
Test for RF Carrier Current signals
Tests: DMM, Audio analysis, Broadband RF and Activity level
2. Off-Hook Test Stage
Handset off hook, a call is in progress, audio should be passing through the line only on
the main pair.
To validate Audio Testing. Test for audio on odd pairs.
Characterize system parameters such as voltage and compare with On-Hook Case.
Test for RF Carrier Current signals
Tests: DMM, Audio analysis, Broadband RF and Activity level
3. Phone Disconnected Stage
Phone disconnected from line, but line is connected to digital switch.
Characterize system parameters such as voltage.
Analyze Line with FDR, and compare FDR results between pairs to look for taps
Tests: DMM, FDR
4. Open Circuit Stage
Line is not connected to switch or phone set. No electronic connections should exist
anywhere on the line. Line is completely isolated from everything except the TALAN.
Test Line with bias voltage for attached microphones
Analyze Line with FDR, and compare FDR results between pairs
Test Line for taps and microphones
Tests: NLJD, FDR, Capacitance
5. End-of-Line Stage
The line is isolated as in the above stage however, there is a passive load (no electronics,
only a resistive network) attached to the end of the line to improve FDR sensitivity and
provide loop resistance test.
Analyze Line with FDR, and compare FDR results between pairs and with Open
Circuit stage
Test Line for serial taps using loop resistance
Tests: FDR, Loop resistance
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