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Table 401: Analog Electronic Power Feed Test (#56) 2 of 2
Error
Code
Test
Result
Hybrid Circuit and Conference Circuit Test (#57)
PASS The Analog Electronic Power Feed test passed. The message to turn on
the power to the station was successfully sent to the port.
1. Although this test will never actually return a FAIL result except for an
internal system error, it will log an error if the overcurrent case is
detected by the hardware. Check the Error Log for any entries with
Error Type 257 when the test has completed.
2. If Error Type 257 does not appear in the Error Log within 10 seconds
after completion of this test, it is safe to assume that the test sensed
no problems with the power to the station. To verify that the station is
powered up correctly, run a self-test on the station, if available, and
check that every feature button is operating.
3. The appearance of Error Type 257 in the Error Log indicates a station
power problem. Check for a wiring short, a damaged jack, a defective
voice terminal, or an incorrect type of terminal.
0 NO
BOARD
Description / Recommendation
See NO BOARD for the repair procedures.
Hybrid Circuit and Conference Circuit Test (#57)
2 of 2
This test checks two different port circuit functions. It performs an analog reflective looparound
measurement on the port’s hybrid circuitry. The Conference Circuit test performs a conference
test on the port’s Network Processing Element (NPE).
For the test results to be valid, a voice terminal must be connected to the port being tested. The
test instructs the on-board microprocessor to put the port in analog reflective looparound mode.
The Tone-Clock circuit pack supplies a 1004-Hz tone to the port’s listen time slot and a GPTD
(General-Purpose Tone Detector) measures the level of the reflected signal appearing on port’s
talk time slot.
The Conference test is performed only if the Hybrid Circuit test passes. The Conference Circuit
test verifies that the NPE can correctly conference several test tones together. The test is
executed in two parts. The first half of the test verifies operation of the NPE’s first three
conference channels, and the second half verifies the NPE’s remaining four conference
channels. The test puts the NPE in looparound mode and instructs it to talk on a specified time
slot while listening to a 1004-Hz tone using the Conference Channels. A GPTD then measures
Communication Manager Release 5.0 Issue 4 January 2008 1521