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Cisco TelePresence System Administration Guide
OL-21845-01
Chapter 4 Troubleshooting the CTS 500
Managing CTS 500 Hardware Setup
Step 8
Click Stop to end testing.
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.
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. Push
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.
