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Cisco TelePresence System Administrator Guide
OL-21845-01
Chapter 7 Troubleshooting the CTS 1100
Managing CTS 1100 Hardware Setup
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 Guide
.
For more system troubleshooting information, see the
Cisco TelePresence System Troubleshooting
Guide
on Cisco.com.
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
Cisco TelePresence System 1100
Assembly, Use & Care, and Field Replacement Unit Guide
.
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:
Step 1
Log in to the Cisco TelePresence System.
Step 2
Navigate to Troubleshooting > Hardware Setup > Presentation Devices.
Step 3
Click the Test Pattern radio button.
Microphone icon with question
mark displays.
One of the microphones is
unplugged.
Check that the microphone is properly plugged in.
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.
Table 7-5
Troubleshooting Microphones (continued)
Problem
Possible Cause
Possible Solution
