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Maintenance Objects
555-233-119
668
Issue 5 October 2002
The Conference Circuit Test verifies that the NPE channel for the port being
tested can correctly perform the conferencing function. As part of Test #47, the
operation of the port conference circuits in the NPE for three and four parties is
also tested. In addition, a test is run to measure noise. The NPE is instructed to
listen to several different tones and conference the tones together. The resulting
signal is measured by a Tone Detector port. If the level of the tone is within a
certain range, the test passes.
The noise test is performed by filtering out the tone and measuring inherent port
noise.
NOTE:
This Loop Around Test is sensitive to the length of the loop, the equipment in
the loop, or the equipment terminating the loop, such as off-premises
stations. If this test is causing a false alarm, disable the test by changing the
Tests field to “no” using change station for this station.
Figure 19. Analog Loop Around and Conference Test
TONE
LEVEL
MEASUREMENT
TONE
SOURCE
TDM BUS
BFC*
CODEC
NPE*
ETC.
PORT
* BFC - BATTERY FEED AND HYBRID CHIP
NPE - NETWORK PROCESSING ELEMENT
TN742,
TN769,