User guide

16
Cisco TelePresence System Codec C90 Physical interface guide
D14644.03 Codec C90 Physical Interface Guide TC4.1, February 2011.
© 2010-2011 Cisco Systems, Inc. All rights reserved.
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Audio inputs, continued...
Unused, but connected audio inputs must be
set to O to avoid unwanted audio/noise.
Line In 1–4 (RCA)
4 x RCA sockets, audio input 1–4
Audio Line In 1–4 are used when connecting
to PC and to external playback devices, such
as VCR’s or DVD players.
Main connectors. The Line In 1 (left) and Line
In 2 (right) are the main connectors to a PC.
Stereo. For systems with stereo I/O the audio
inputs can be congured in stereo pairs:
• Connect the left channel to Line In 1 or 3
• Connect the right channel to Line In 2 or 4
Default conguration for Line In 1–2. In the
default conguration Line In 1 and 2 are
congured as stereo inputs for external
playback devices, such as a PC.
Default conguration for Line In 3–4. In the
default conguration Line In 3 and 4 are
congured as stereo input pairs. The two
inputs are paired with Line Out 3 and 4
respectively.
This pairing will avoid feedback situations that
can arise when playback/recording devices
are in standby mode (Loop suppression).
Line In 3 and 4 are used with external
playback devices as VCR’s and DVD players.
RCA - Phono Plug (the Radio Corporation
of America)
4xLine In
RCA pin-out
External view of socket
GNDSignal
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Introduction
The physical interface
Connecting to the codec
The physical interface