Running The Local Video/Audio Loopback Test - PictureTel Concorde 4500 Servicing Manual

TROUBLESHOOTING

Running the Local Video/Audio Loopback Test

4-34
Table 4-10: Loopback Tests (Continued)
Test
Run Local Channel
Loopback
Run Remote Video/
Audio Loopback
Run Remote CSU
Loopback
When you choose
Run Video/Audio Loopback
signals from your local camera and microphones are looped back to
your monitor and speakers. These signals are local to your system
and are not compressed or sent on telephone lines.
The audio is real time with no delay. This test veriÞes the operation
of the near-end components and the cables up to the VCS. Thus, if
this test runs without errors, your hardware components, such as
video and audio board, cameras and peripheral equipment, are
probably operating correctly and the problem is elsewhere.
The following Þgure illustrates how the local video/audio loopback
test runs.
Definition
Takes the audio and video signals from
the local system and loops them back
through the local codec and the H.320
multiplexer. You do not need to place a
call to run this test.
Requests the far-end system to retrieve
data after passing it through the codec
and back. Displays the near-end video
image on your full screen with
accompanying audio after looping
through the far-end electronics module.
This test is part of the ITU-T H.320
videoconferencing standards and is used
by PictureTel service providers to test
PictureTel systems with other vendorsÕ
equipment. You must make a call to run
this test.
Displays the near-end video image on
your full screen after looping the signal
through both the near-end and far-end
CSUs. You must make a call to run this
test.
, the video and audio