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DIG-LINE (Digital Line)
Issue 4 May 2002 10-575 555-233-123
Digital Line Electronic Power Feed/Positive
Temperature Coefficient/PPF Test(#11)
For TN413, and TN754 vintage 13 or earlier, this is an Electronic Power Feed
(EPF) restore test. In this test, the processor requests that the EPF be turned on
for a given port, and an attempt is made to turn on the power supply to the station.
If no current is drawn, the station is probably not connected. If an overcurrent
condition is sensed, there may be a short in the loop. A message is returned
reporting that either the EPF was successfully turned on, or that an overcurrent
condition was sensed. This test is repeated again 5 seconds later.
For TN754 vintage 14 or later, TN754B and TN2136 this is a Positive Temperature
Coefficient (PTC) restore test. In this test, the processor requests that the PTC be
turned on for a given port, and an attempt is made to turn on the power supply to
the station. If an overcurrent condition is sensed, there is probably a short on the
power line that causing the PTC to open and disconnect the voice terminal. Since
the PTC does not have self-restore capability, the voice terminal must be
manually unplugged for 30 seconds and then plugged back in to restore the PTC.
A message is returned reporting that either the PTC was successfully turned on
successfully with no problem or an overcurrent condition was sensed. This test is
repeated again 5 seconds later.
1020 ABORT Test disabled via background testing. Use status station
command to determine when station is available for testing.
2000 ABORT Response to the test request was not received within the
allowable time period.
1. Retry the command at 1-minute intervals a maximum of 5
times.
1
2 FAIL The Network Processing Element (NPE) of the tested port was
found to be transmitting in error. This will cause noisy and
unreliable connections. Failure code 1 indicates that the
Crosstalk test failed on the primary channel. Failure code 2
indicates that the Crosstalk test failed on the secondary
channel.
1. Replace circuit pack.
PASS The port is correctly using its allocated time slots.
1. To be sure that this is not an intermittent problem, repeat
this test up to a maximum of 10 times to make sure it
continues to pass.
2. If complaints persist, examine the station, connections,
and wiring.
Table 10-212. TEST #9 Digital Line NPE Crosstalk Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page