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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 Microphones
Use the information in
Table 4-5
to troubleshoot microphones.
Table 4-5
Troubleshooting Microphones
Problem
Possible Cause
Possible Solution
Sound is muffled.
Something near or on the
microphone is distorting the
sound.
Move objects away from the microphone.
No sound registers.
Microphone cable is not
connected or is only partially
connected.
•
Check that the system is plugged in and power is
on.
•
Check that the microphone plug is firmly seated in
the correct connector on the primary codec.
•
Check that the mute light on each microphone is lit.
An unlit light indicates that the microphone is not
plugged in.
•
Lightly tap the microphone to see if sound
registers.
•
Contact Cisco technical support if you are certain
that the cabling is correct and power is applied to
the system, but no sound registers on the
microphone.
Microphone icon with red pipe
displays.
•
Microphone is not
connected.
•
One of the microphones is
unplugged.
Check that the microphone is properly plugged in.
Sound is hollow and echoes.
Room is not acoustically treated
or has many hard surfaces.
•
Adjust the position of the CTS 500.
•
Add acoustic treatment to the walls and windows in
the room
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.
