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Cisco TelePresence System Release 1.6 Administration Guide
OL-13676-05
Chapter 4 Troubleshooting the CTS 500
Managing Hardware Setup
Troubleshooting Speakers
Use the information in
Table 4-4
to troubleshoot speakers.
Related Information
For more information about setting up and testing speakers, see the
Cisco TelePresence System 500
Assembly, Use & Care, and Field Replacement Unit Guide
.
For more system troubleshooting information, see the
Cisco TelePresence System Troubleshooting
Guide
on Cisco.com.
Testing Microphones
The microphones are set up successfully when each microphone registers sound. You must supply sound
at each microphone to complete this test.
Note
The number of audio meters that are shown on the test screen is determined by the number of
microphones that have been configured in Cisco Unified Communications Manager (Cisco Unified CM)
and the version of Cisco Unified CM that you are running.
Table 4-4
Troubleshooting Speakers
Problem
Possible Cause
Possible Solution
No sound is heard.
Speaker cable is not connected
or is only partially connected.
•
Check that the red and black pronged ends of the
speaker cable are securely fastened under their
corresponding connectors on the speaker.
•
Check that the speaker cable is plugged into the
correct receptor on the primary codec.
•
Tug on the plug to see if it is fully plugged in. Press
the plug in firmly until a click is heard.
Sound is not synchronized with
video.
—
Contact Cisco technical support.
Choppy audio during
double-talk (when both sides are
talking simultaneously).
Audio Echo Canceller (AEC)
very briefly mistakes one of the
speech patterns for noise and
cancels it, resulting in choppy
audio.
•
The audio from the remote
side is slightly attenuated
before it is played out the of
the speaker.
•
The echo cancellation
feature removes some of the
sound from the talkers
during the double talk.
Check whether there has been a change in the echo path
(someone has moved the speaker or microphone, or
maybe a laptop directly in front of a mic). Otherwise,
this is expected behavior. The existing filter parameters
should be enough to cancel out the sound from the
speaker. However, during double-talk, echo
cancellation will always remove some sound from the
talker.
