Cisco MXP Series Il manuale dell'interfaccia fisica - Pagina 20
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MXP Series Codecs
Contents
Audio signal levels in Vpp and dBu
Microphone Inputs 1 & 2
Signal levels
Signal
Clipping levels
levels
Input
menu
level
setting
[dB]
[mVpp]
[dBu]
0.0
83.0
–28.4
1.5
69.8
–29.9
3.0
58.8
–31.4
4.5
49.4
–32.9
6.0
41.6
–34.4
7.5
35.0
–35.9
9.0
29.4
–37.4
10.5
24.8
–38.9
12.0
20.8
–40.4
13.5
17.5
–41.9
15.0
14.8
–43.4
16.5
12.4
–44.9
18.0
10.4
–46.4
19.5
8.8
–47.9
21.0
7.4
–49.4
22.5
6.2
–50.9
Audio outputs 1 & 2
D14790.01 MXP Series Codec Physical Interface Guide, May 2011.
© 2011 Cisco Systems, Inc. All rights reserved.
Introduction
Audio Inputs 3 & 4
Signal levels
Nominal
Signal
Clipping levels
level
levels
Input
menu
level
setting
[dBu]
[dB]
[Vpp]
–46.4
0.0
15.5
–47.9
1.5
13.0
–49.4
3.0
11.0
–50.9
4.5
9.2
–52.4
6.0
7.8
–53.9
7.5
6.5
–55.4
9.0
5.5
–56.9
10.5
4.6
–58.4
12.0
3.9
–59.9
13.5
3.3
–61.4
15.0
2.8
–62.9
16.5
2.3
–64.4
18.0
2.0
–65.9
19.5
1.6
–67.4
21.0
1.4
–68.9
22.5
1.2
Audio inputs 3 & 4
Microphone inputs 1 & 2
Codec 6000 MXP
Audio Outputs 1 & 2
Nominal
Signal
level
levels
Input
menu
level
setting
[dBu]
[dBu]
[dB]
17.0
–1.0
0.0
15.5
–2.5
1.5
14.0
–4.0
3.0
12.5
–5.5
4.5
11.0
–7.0
6.0
9.5
–8.5
7.5
8.0
–10.0
9.0
6.5
–11.5
10.5
5.0
–13.0
12.0
3.5
–14.5
13.5
2.0
–16.0
15.0
0.5
–17.5
16.5
-1.0
–19.0
18.0
-2.5
–20.5
19.5
-4.0
–22.0
21.0
-5.5
–23.5
22.5
Default levels are denoted as follows:
20
Codec 3000 MXP
Codec 3000 MXP
NOTE!
Signal levels
referred to as Line input 1 & 2 in
the API.
Absolute max output
Nominal
level
level
TIP!
To convert dBu values to dBV,
subtract 2.2 dB from the dBu value.
EXAMPLE:
[Vpp]
[dBu]
[dBu]
NOTE!
1.2
–5.5
–23.5
the absolute max output levels all
1.4
–4.0
–22.0
assume sinusoidal signals for the
dBu values.
1.6
–2.5
–20.5
1.9
–1.0
–19.0
2.3
0.5
–17.5
2.8
2.0
–16.0
3.3
3.5
–14.5
3.9
5.0
–13.0
4.6
6.5
–11.5
5.5
8.0
–10.0
6.5
9.5
–8.5
7.8
11.0
–7.0
9.2
12.5
–5.5
11.0
14.0
–4.0
13.0
15.5
–2.5
15.5
17.0
–1.0
–31.4
Physical interface guide
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Audio inputs 3 & 4 are
–10 dBu => –12.2 dBV
The input clipping levels and
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