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Chapter 4
Troubleshooting the CTS 500
Troubleshooting Speakers
Use the information in
Table 4-4
Troubleshooting Speakers
Problem
No sound is heard.
Sound is not synchronized with
video.
Choppy audio during
double-talk (when both sides are
talking simultaneously).
Related Information
For more information about setting up and testing speakers, see the
Assembly, Use & Care, and Field Replacement Unit
For more system troubleshooting information, see the
Guide
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.
OL-13676-05
Table 4-4
Possible Cause
Speaker cable is not connected
or is only partially connected.
—
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.
on Cisco.com.
to troubleshoot speakers.
Possible Solution
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.
Contact Cisco technical support.
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.
Guide.
Cisco TelePresence System Troubleshooting
Cisco TelePresence System Release 1.6 Administration Guide
Managing Hardware Setup
Cisco TelePresence System 500
4-19
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Troubleshooting
