Cisco TelePresence System Codec C90
Contents
Audio signal levels,
cont...
Line outputs 1 to 4
Female RCA/phone
Signal
Absolute max
Nominal
levels
output level
level
Level
setting
[dB]
[Vpp]
[dBu]
[dBu]
-24.0
1,1
-6.0
-23.0
1,2
-5.0
-22.0
1,4
-4.0
-21.0
1,5
-3.0
-20.0
1,7
-2.0
-19.0
1,9
-1.0
-18.0
2,2
0.0
-17.0
2.5
1.0
-16.0
2.8
2.0
-15.0
3.1
3.0
-14.0
3.5
4.0
-13.0
3.9
5.0
-12.0
4.4
6.0
-11.0
4.9
7.0
-10.0
5.5
8.0
-9.0
6.2
9.0
-8.0
6.9
10.0
-7.0
7.8
11.0
-6.0
8.7
12.0
-5.0
9.8
13.0
-4.0
11.0
14.0
-3.0
12.3
15.0
-2.0
13.8
16.0
-1.0
15.5
17.0
0.0
17.4
18.0
Notes:
1.
Default levels are marked with white text on
black
2.
For the dBu value for input clipping level and
absolute max output level, a sine waveform is
assumed
3.
If numbers in dBV are required, dBV value is 2.2
dB lower than the dBu value.
Example: -10 dBu equals -12.2 dBV
D14644.03 Codec C90 Physical Interface Guide TC4.1, February 2011.
© 2010-2011 Cisco Systems, Inc. All rights reserved.
Introduction
Audio hardware information table
Signal type
Connector (codec)
Input impedance
Output impedance
Max input level when set to Min input level
-24.0
Max input level when set to Max input level
-23.0
Max output level when set to Min output level
-22.0
Max output level when set to Max output level
-21.0
Gain range
-20.0
Phantom power
-19.0
Phantom power resistor pin 1
-18.0
Phantom power resistor pin 2
-17.0
Max phantom power current (per mic)
-16.0
-15.0
-14.0
-13.0
* This specification is valid for Mic 1–8 inputs if Microphone Level setting is selected
-12.0
** This specification is valid for Line 1-8 inputs if Line Level setting is selected
-11.0
-10.0
-9.0
-8.0
-7.0
-6.0
-5.0
Volume control table
-4.0
-3.0
-2.0
-1.0
Ring tone volume*
0.0
* The ring tone volume, which is displayed on screen
when using the TRC5 remote control, goes from 0
to 20.
Connecting to the codec
Hardware Information
Mic 1–8 *
Balanced
XLR-F
8100 Ohm (pin 2–3)
–18dBu/275mVpp
–42dBu/35mVpp
48 Volt +/- 2%
6800 Ohm
6800 Ohm
14mA
Volume control
Audio gain value
0
0
1
-34.5 dB
70
0.0 dB
100
15.0 dB
20
Physical interface guide
The physical interface
The physical interface
Line in 1–8 **
Line out 5–6
Line in 1–4
Balanced
Balanced
Unbalanced
XLR-F
XLR-M
Female RCA/phono
10k Ohm (pin 2–3)
10 k Ohm
50 Ohm
24dBu/34.7Vpp
18dBu/17.4Vpp
0dBu/4.4Vpp
-6dBu/2.2Vpp
0dBu/4.4Vpp
24dBu/34.8Vpp
<–24dB (24 steps of 1dB) –>
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Line out 1–4
Unbalanced
Female RCA/phono
100 Ohm
-6dBu/2.2Vpp
18dBu/17.4Vpp
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