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Digital Line Electronic Power Feed Test (#11)
Digital Line Electronic Power Feed Test (#11)
For TN413, and TN754 vintage 13 or earlier, this is the 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.
For TN2181 and TN2224 boards, this is a Protected Power Feed restoral test, since the boards
carry Protected Power Feed (PPF) relays, one for each port. 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 overcurrent persists, the power will be shut off
automatically.
For MM717 Media Modules, this is an EPF Restore Test. The Media Module provides power to
the terminals. The test procedure and its response is same as that of EPF. If the overcurrent
persists, the power will be shut off automatically.
This test runs on the following maintenance objects:
● DIG-LINE (Digital Line)
● RC-BD (Radio Controller Board)
Table 383: Digital Line Electronic Power Feed Test (#11) 1 of 2
Error
Code
Test
Result
Description / Recommendation
ABORT Internal system error
1. Retry the command at 1-minute intervals up to 5 times.
1 of 2
Communication Manager Release 5.0 Issue 4 January 2008 1463