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Managing Hardware Setup
Table 6-5
Troubleshooting Microphones (continued)
Problem
Microphone icon with question
mark displays.
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 1100 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 main display screen. You
can optionally add an external presentation display screen that displays the presentation instead of
displaying it as PiP on the main display screen. The presentation display is attached to the External
Presentation Display HD video connection on the codec. See the
Assembly, Use & Care, and Field Replacement Unit
Note
If the video works for a few minutes and then stops working, your presentation device might use an
unsupported video protocol. To see the list of displays that the CTS 1100 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:
Log in to the Cisco TelePresence System.
Step 1
Navigate to Troubleshooting > Hardware Setup > Presentation Devices.
Step 2
Click the Test Pattern radio button.
Step 3
Cisco TelePresence System Release 1.5 Administrator Guide
6-22
Possible Cause
One of the microphones is
unplugged.
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 6
Possible Solution
Check that the microphone is properly plugged in.
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
Cisco TelePresence System 1100
Guide.
Troubleshooting the CTS 1100
Guide.
OL-13676-04
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