DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-88ANL-LINE, ANL-NE-L (8-Port Analog Line)
9
Looparound and Conference Test (#47)
Each Analog Port consists of
■ A Network Processing Element (NPE) for port connectivity and gain, and
conferencing functionality
■ A codec which converts TDM Bus digital signals to analog
■ A battery feed chip that provides power to the telephone set for signaling,
dial pulsing, transmission, and balance.
This test is designed to check the on-board transmission capabilities of the NPE,
the codec, and the battery feed chip of the Analog Port. A Tone Detector and a
Tone Generator talk and listen on the same pair of time slots as the Analog Port.
The Analog Port is then instructed to go into loop around mode (see Figure 9-1
).
The test passes if the signal measured by the Tone Detector is within acceptable
limits.
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:
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, then disable the test by
changing the Tests field to ‘‘no’’ using the
change station
command for this
station.
