Audio Signal Levels Tables - Cisco TelePresence System Codec C90 Manual
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Cisco TelePresence System Codec C90
Contents
Audio signal levels tables
Microphone Inputs 1 to 8
XLR female
Signal
Clipping level
Nominal
levels
level
Level
setting
[dB]
[mVpp]
[dBu]
[dBu]
0.0
275.0
-18.0
1.0
245.1
-19.0
2.0
218.4
-20.0
3.0
194.7
-21.0
4.0
173.5
-22.0
5.0
154.6
-23.0
6.0
137.8
-24.0
7.0
122.8
-25.0
8.0
109.5
-26.0
9.0
97.6
-27.0
10.0
87.0
-28.0
11.0
77.5
-29.0
12.0
69.1
-30.0
13.0
61.6
-31.0
14.0
54.9
-32.0
15.0
48.9
-33.0
16.0
43.6
-34.0
17.0
38.8
-35.0
18.0
34,6
-36.0
19.0
30,9
-37.0
20.0
27,5
-38.0
21.0
24,5
-39.0
22.0
21,8
-40.0
23.0
19,5
-41.0
24.0
17,4
-42.0
This specification is valid for Mic 1–8 inputs
if Microphone Level setting is selected.
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
Line Inputs 1 to 8
XLR female
Signal
Clipping level
levels
Level
setting
[dB]
[Vpp]
[dBu]
-36.0
0.0
34.7
24.0
-37.0
1.0
31.0
23.0
-38.0
2.0
27.6
22.0
-39.0
3.0
24.6
21.0
-40.0
4.0
21.9
20.0
-41.0
5.0
19.5
19.0
-42.0
6.0
17.4
18.0
-43.0
7.0
15.5
17.0
-44.0
8.0
13.8
16.0
-45.0
9.0
12.3
15.0
-46.0
10.0
11.0
14.0
11.0
9.8
13.0
-47.0
12.0
8.7
12.0
-48.0
13.0
7.8
11.0
-49.0
-50.0
14.0
6.9
10.0
-51.0
15.0
6.2
-52.0
16.0
5.5
-53.0
17.0
4.9
-54.0
18.0
4,4
-55.0
19.0
3,9
-56.0
20.0
3,5
-57.0
21.0
3,1
-58.0
22.0
2,8
-59.0
23.0
2,5
-60.0
24.0
2,2
This specification is valid for Line 1–8 inputs
if Line Level setting is selected.
Connecting to the codec
Line outputs 5 to 6
XLR male
Nominal
Signal
Absolute max
level
levels
output level
Level
setting
[dBu]
[dB]
[Vpp]
6.0
-24.0
2,2
5.0
-23.0
2,5
4.0
-22.0
2,8
3.0
-21.0
3,1
2.0
-20.0
3,5
1.0
-19.0
3,9
0.0
–18.0
4.4
-1.0
–17.0
4.9
-2.0
–16.0
5.5
-3.0
–15.0
6.2
-4.0
–14.0
6.9
-5.0
–13.0
7.8
-6.0
–12.0
8.7
-7.0
–11.0
9.8
–10.0
11.0
-8.0
–9.0
12.4
9.0
-9.0
–8.0
13.9
8.0
-10.0
–7.0
15.6
7.0
-11.0
–6.0
17.5
6.0
-12.0
–5.0
19.6
5.0
-13.0
–4.0
22.0
4.0
-14.0
–3.0
24.7
3.0
-15.0
–2.0
27.7
2.0
-16.0
–1.0
31.0
1.0
-17.0
0.0
34.8
0.0
-18.0
19
Physical interface guide
The physical interface
The physical interface
Line Inputs 1 to 4
Female RCA/phone
Nominal
Signal
Clipping level
level
levels
Level
setting
[dBu]
[dBu]
[dB]
[Vpp]
0.0
-18.0
0.0
1.0
-17.0
1.0
2.0
-16.0
2.0
3.0
-15.0
3.0
4.0
-14.0
4.0
5.0
-13.0
5.0
6.0
-12.0
6.0
7.0
-11.0
7.0
8.0
-10.0
8.0
9.0
-9.0
9.0
10.0
-8.0
10.0
11.0
-7.0
11.0
12.0
-6.0
12.0
13.0
-5.0
13.0
14.0
-4.0
14.0
15.0
-3.0
15.0
16.0
-2.0
16.0
17.0
-1.0
17.0
18.0
0.0
18.0
19.0
1.0
19.0
20.0
2.0
20.0
21.0
3.0
21.0
22.0
4.0
22.0
23.0
5.0
23.0
24.0
6.0
24.0
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Nominal
level
[dBu]
[dBu]
17.4
18.0
0.0
15.5
17.0
-1.0
13.8
16.0
-2.0
12.3
15.0
-3.0
11.0
14.0
-4.0
9.8
13.0
-5.0
8.7
12.0
-6.0
7.8
11.0
-7.0
6.9
10.0
-8.0
6.2
9.0
-9.0
5.5
8.0
-10.0
4.9
7.0
-11.0
4.4
6.0
-12.0
3.9
5.0
-13.0
3.5
4.0
-14.0
3.1
3.0
-15.0
2.8
2.0
-16.0
2.5
1.0
-17.0
2,2
0.0
-18.0
2,0
-1.0
-19.0
1,7
-2.0
-20.0
1,6
-3.0
-21.0
1,4
-4.0
-22.0
1,2
-5.0
-23.0
1,1
-6.0
-24.0
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