Related Information; Testing The External Presentation Display - Cisco CTS 1000 - TelePresence System 1000 Video Conferencing Administration Manual

Chapter 9 Troubleshooting the CTS 3000 and CTS 3200
Table 9-4 Troubleshooting Microphones (continued)
Problem
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 displays, see the following documentation:
•
•
•

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 following
documentation for more information:
•
•
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 3000 and CTS 3200 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:
OL-21845-01
Possible Cause
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.
Cisco TelePresence System 3000 Assembly, Use & Care, and Field Replacement Unit Guide
Cisco TelePresence System 3200 Assembly, Use & Care, and Field Replacement Unit Guide
For more system troubleshooting information, see the
Guide on Cisco.com.
Cisco TelePresence System 3000 Assembly, Use & Care, and Field Replacement Unit Guide
Cisco TelePresence System 3200 Assembly, Use & Care, and Field Replacement Unit Guide
Managing CTS 3000 and CTS 3200 Hardware Setup
Possible Solution
CTS 3000 only: Run the microphone calibration
procedure in the "Testing Microphones on the CTS
3000" section on page 9-17.
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 Administration Guide
9-21