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 func tionality
■A codec whic h converts TDM Bus digital signals to analog
■A battery feed chip that provides power to the telep hone set for signaling,
dial pulsing, transmission, and balance.
This test is designed to chec k the on-board transmission cap abilities of the NPE,
the codec, and the battery feed chip of th e 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 Fi g ure 9 - 1).
The test passes if the signal measured b y the Tone Detector is within acceptable
limits.
The Conference Circuit Test verifies that the NPE channel for the port being
tested can correc tly perform the conferencing function. Test #47 also tests the
operation of the port co nference 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 sev eral
different tones and conferenc e the tones together. The resulting signal is then
measured by a Tone Detector port. If the level of the tone is wi thin a certain
range, the test passes.
The noise test is performed by filte ring out the tone, and then measuring inherent
port noise.
NOTE:
This Looparound Test is sensitive to the length of the loop, the equip ment in
the loop, or the equipment terminating the loop, such as off-p remises
stations. If this test is causing a false alar m, then disable the test by
changing the Tests field to ‘‘no’’ using the change station c ommand for this
station.