Maintenance Objects
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.
* BFC - BATTERY FEED AND HYBRID CHIP
NPE - NETWORK PROCESSING ELEMENT
Figure 19. Analog Loop Around and Conference Test
668
Issue 5 October 2002
TONE
LEVEL
SOURCE
MEASUREMENT
BFC*
CODEC
TONE
NPE*
TDM BUS
TN742,
TN769,
ETC.
PORT
555-233-119