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555-233-119
1038
Issue 5 October 2002
Digital Line Electronic Power Feed/Positive
Temperature Coefficient/PPF Test (#11)
For 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 shuts off automatically and an EPF_
off_overcurrent message is sent uplink.
Table 205. TEST #11 Digital Line Electronic Power Feed Test
Error
Code Test
Result Description/ Recommendation
ABORT Internal System Error
1. Retry the command at 1-minute intervals a maximum of 5 times.
1000 ABORT System resources required to run this test are not available. The port may
be busy with a valid call. Use display port PCSSpp to determine the station
extension or attendant number of the port. Use status station or status
attendant to determine the service state of the port. If the service state
indicates that the port is in use, then the port is unavailable for certain tests.
You must wait until the port is idle before retesting. Attendants are always in
use (off-hook) if the handset is plugged in and the port is not busied out.
1. If the port status is idle, then retry the command at 1-minute intervals a
maximum of 5 times.
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