Test-Um VALIDATOR-NT NT955 - Manual (Page 76)

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Test-Um NT955 Series
6.1. Port Discovery
Port discovery identifies telephone or network devices connected to the
other end of the jack or cable. The test begins with a search for voltages
that may be present. If voltages are found, the patterns for commonly
used services are compared to the voltages observed and reported as
phone, ISDN or legacy phantom power as appropriate. If the voltage
pattern is unknown, the port pin conditions are reported.
Port Discovery
Telephone
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Figure 6.2 Phone Detected
Validator TM Network Tests