Routine Maintenance Procedures
555-233-123
5-56 Issue 4 May 2002
UCC-designated broadcaster, status conference X indicates a Video Status of u.
Also, for UCC rollcall the return video may appear to be stuck. Check the Video
Status for an “
R,” indicating rollcall.
If none of the examples above appears to be the cause, and if the room was quiet,
all speakers are valid video sources, the conference is voice-activated, and the
speaker can be heard, then escalate the problem.
Video Never Switches to a Particular Party
Description
Verify that the endpoint is a valid video source as described in the “Calls
Terminate with No Video” section above. If it is, then the audio from the endpoint
may not have sufficient voice signal for the hardware to determine the parties at
the endpoint are speaking. Check the
Talk field on page three of the Status
Conference X Endpoint Y form to see if the talking bit is y. Next, check the
audio by standing adjacent to the microphone and speaking at a normal level.
Solution
If the audio is not muffled:
1. Use the status conference command to determine which port on the
TN788B (VC board) is connected to this endpoint.
2. Check the VC (TN788B) board using the test board xxyy long command.
3. Drop the call.
4. Find another available port, then:
a. Busyout the port to which the endpoint was connected.
b. Make another call to the same conference. If the problem corrects
itself, then the previous port may be bad. If there are other VC
boards with sufficient available ports to replace calls on the current
VC, then pull the board that has the bad endpoint on it (the status
conference command displays the encoder port associated with the
call). The system will automatically reestablish the VC connections
without dropping the call. If this fixes the problem, then replace the
board, as it has at least one bad port. Reseating the board may
temporarily fix the problem due to the hard reset done to the board.
Audio Echo
Echo in conference calls, particularly those with large delay characteristics, is
totally disruptive. When Voice Activated Switching is taken into account, the
effects are disastrous. Various arrangements of the microphone(s) and room
speaker(s) may be needed.
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