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Communication Manager Maintenance-Object Repair Procedures
942 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
Digital Line Electronic Power Feed/Positive
Temperature Coefficient/PPF Test (#11)
S8700 | 8710 / S8500
For TN413, and TN754 vintage 13 or earlier, this is an Electronic Power Feed (EPF) restoral
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) restoral 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-restoral 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.
TN2181 and TN2224 boards carry a Protected Power Feed (PPF) relays, one for each port.
Therefore this will be a Protected Power Feed restoral test. The test procedure and its response
is same as that of EPF. One of differences between EFP and PPF is that, if the port goes into a
overcurrent state, PPF does not report this change of state because it is a transient state which
will not last more than 50ms. If the over current persists the power will be shut off automatically
and an EPF_off_overcurrent message is sent uplink.
S8300 / G700
MM711 Media Modules provide power to the terminals. Therefore this will be an EPF restore
test. The test procedure and its response is same as that of EPF. If the over current persists the
power will be shut off automatically and an EPF_off_overcurrent message is sent uplink.
Table 322: Test #11 Digital Line Electronic Power Feed Test
Error
Code
Test
Result
Description / Recommendation
ABRT Internal system error
1. Retry the command at 1-minute intervals up to 5 times.
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