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ANL-LINE (8-Port Analog Line)
Issue 1 June 2005 417
The Conference Circuit test verifies that the NPE channel for the port being tested can correctly
perform the conferencing function. Test #47 also tests the operation of the port conference
circuits in the NPE for three and four parties. 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 then 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 then measuring inherent port noise.
Note:
Note: This looparound 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, use change station for this station and change
the Tests field to n, to disable the test.
Figure 22: Analog Looparound and Conference Test
Table 123: Test #47 Loop Around and Conference Test
Error
Code
Test
Result
Description / Recommendation
ABRT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals up to 5 times.
1 of 5
TDM BUS
BFC: Battery Feed Chip
NPE: Network Processing Element
Analog
Line
Port
BFC
CODEC
NPE Tone
Generator
Tone
Detector