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Managing Hardware Setup
Table 7-5
Troubleshooting Microphones (continued)
Problem
Sound registers at the wrong
microphone.
Microphone switches to a
segment that has no one talking.
Choppy audio during
double-talk (when both sides are
talking simultaneously).
Related Information
For more information about setting up and testing presentation devices, see the
Cisco TelePresence System 1300 Assembly, Use & Care, and Field Replacement Unit
For more system troubleshooting information, see the
Guide
Testing the External Presentation Display
By default, presentations are displayed as presentation-in-picture (PiP) on the center screen of
multi-screen main display systems. You can optionally add an external presentation display screen that
displays the presentation instead of displaying it as PiP on the main display screen. This display is
attached to the External Presentation Display HD video connection on the codec. See the
Cisco TelePresence System 1300 Assembly, Use & Care, and Field Replacement Unit
information.
If the video works for a few minutes and then stops working, your presentation device might use an
Note
unsupported video protocol. To see the list of displays that the CTS 1300 supports, see the release notes
for your CTS software version on Cisco.com.
A PiP softkey will be displayed on the phone only if a PiP is active. Pip is not available for audio-only
calls.
To test an external presentation device, follow these steps:
Cisco TelePresence System Release 1.6 Administration Guide
7-96
Possible Cause
Microphone cable is not
connected to its corresponding
codec.
Phantom switching.
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.
Chapter 7
Possible Solution
Check that the cable from the microphone is
•
plugged into the correct receptor on the codec.
Plug all microphones into the primary codec.
•
Run the microphone calibration procedure in the
"Testing Microphones on the CTS 1300" section on
page
7-94.
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.
Cisco TelePresence System Troubleshooting
Troubleshooting the CTS 1300
Guide.
Guide. for more
OL-13676-04
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Troubleshooting
