User guide

20
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 hardware information table
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
Volumecontrol
Ring tone volume* Audio gain value
0 0
1 -34.5 dB
70 0.0 dB
100 15.0 dB
Audio signal levels, cont...
Volume control table
HardwareInformation
Mic 1–8 * Line in 1–8 ** Line out 5–6 Line in 1–4 Line out 1–4
Signal type Balanced Balanced Balanced Unbalanced Unbalanced
Connector (codec) XLR-F XLR-F XLR-M Female RCA/phono Female RCA/phono
Input impedance 8100 Ohm (pin 2–3) 10k Ohm (pin 2–3) 10 k Ohm
Output impedance 50 Ohm 100 Ohm
Max input level when set to Min input level –18dBu/275mVpp 24dBu/34.7Vpp 18dBu/17.4Vpp
Max input level when set to Max input level –42dBu/35mVpp 0dBu/4.4Vpp -6dBu/2.2Vpp
Max output level when set to Min output level 0dBu/4.4Vpp -6dBu/2.2Vpp
Max output level when set to Max output level 24dBu/34.8Vpp 18dBu/17.4Vpp
Gain range <–24dB (24 steps of 1dB) –>
Phantom power 48 Volt +/- 2%
Phantom power resistor pin 1 6800 Ohm
Phantom power resistor pin 2 6800 Ohm
Max phantom power current (per mic) 14mA
Lineoutputs1to4
FemaleRCA/phone
Signal
levels
Absolute max
output level
Nominal
level
Level
setting
[dB] [Vpp] [dBu] [dBu]
-24.0 1,1 -6.0 -24.0
-23.0 1,2 -5.0 -23.0
-22.0 1,4 -4.0 -22.0
-21.0 1,5 -3.0 -21.0
-20.0 1,7 -2.0 -20.0
-19.0 1,9 -1. 0 -19.0
-18 .0 2,2 0.0 -18 .0
-17.0 2.5 1.0 -17. 0
-16 .0 2.8 2.0 -16 .0
-15 .0 3.1 3.0 -15. 0
-14 .0 3.5 4.0 -14.0
-13 .0 3.9 5.0 -13 .0
-12.0 4.4 6.0 -12.0
-11. 0 4.9 7. 0 -11. 0
-10 .0 5.5 8.0 -10 .0
-9.0 6.2 9.0 -9.0
-8.0 6.9 10.0 -8.0
-7.0 7. 8 11.0 -7.0
-6.0 8.7 12.0 -6.0
-5.0 9.8 13.0 -5.0
-4.0 11. 0 14.0 -4.0
-3.0 12.3 15.0 -3.0
-2.0 13.8 16.0 -2.0
-1.0 15.5 17. 0 -1.0
0.0 17. 4 18.0 0.0
* This specication is valid for Mic 1–8 inputs if Microphone Level setting is selected
** This specication is valid for Line 1-8 inputs if Line Level setting is selected
* The ring tone volume, which is displayed on screen
when using the TRC5 remote control, goes from 0
to 20.
Contents
Contact us
Introduction
The physical interface
Connecting to the codec
The physical interface