Cisco MXP Series Руководство по физическому интерфейсу - Страница 10
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MXP Series Codecs
Contents
Audio Signal Levels in Vpp and dBu
Microphone Inputs 1, 2 & 3
Signal levels
Signal
Clipping levels
levels
Input
menu
level
setting
[dB]
[mVpp]
[dBu]
0.0
83.0
–28.4
–46.4
1.5
69.8
–29.9
3.0
58.8
–31.4
–49.4
4.5
49.4
–32.9
–50.9
6.0
41.6
–34.4
–52.4
7.5
35.0
–35.9
–53.9
9.0
29.4
–37.4
–55.4
10.5
24.8
–38.9
–56.9
12.0
20.8
–40.4
–58.4
13.5
17.5
–41.9
–59.9
15.0
14.8
–43.4
–61.4
16.5
12.4
–44.9
–62.9
18.0
10.4
–46.4
–64.4
19.5
8.8
–47.9
–65.9
21.0
7.4
–49.4
22.5
6.2
–50.9
–68.9
This specification is always valid for mic 1 and
2, and for mic 3 if mic level setting is selected.
Audio inputs 4–6
Microphone
Audio outputs 1–3
inputs 1–3
D14790.01 MXP Series Codec Physical Interface Guide, May 2011.
© 2011 Cisco Systems, Inc. All rights reserved.
Introduction
Microphone Input 3
Line level mode signal levels
Signal
Clipping levels
Nominal
level
levels
Input
menu
level
setting
[dBu]
[dB]
[Vpp]
[dBu]
0.0
15.5
17.0
–47.9
1.5
13.0
15.5
3.0
11.0
14.0
4.5
9.2
12.5
6.0
7.8
11.0
7.5
6.5
9.5
9.0
5.5
8.0
10.5
4.6
6.5
12.0
3.9
5.0
13.5
3.3
3.5
15.0
2.8
2.0
16.5
2.3
0.5
18.0
2.0
–1.0
19.5
1.6
–2.5
–67.4
21.0
1.4
–4.0
22.5
1.2
–5.5
This specification is valid for mic 3 if line level
setting is selected.
NOTE:
Audio inputs 4–6 are referred to as
Line input 1–3 in the API.
Codec 6000 MXP
Codec 6000 MXP
Audio Inputs 4, 5 & 6
Signal levels
Nominal
Signal
Clipping levels
level
levels
Input
menu
level
setting
[dBu]
[dB]
[Vpp]
[dBu]
–1.0
0.0
15.5
17.0
–2.5
1.5
13.0
15.5
–4.0
3.0
11.0
14.0
–5.5
4.5
9.2
12.5
–7.0
6.0
7.8
11.0
–8.5
7.5
6.5
9.5
9.0
5.5
8.0
–10.0
–11.5
10.5
4.6
6.5
–13.0
12.0
3.9
5.0
–14.5
13.5
3.3
3.5
–16.0
15.0
2.8
2.0
16.5
2.3
0.5
–17.5
18.0
2.0
-1.0
–19.0
19.5
1.6
-2.5
–20.5
21.0
1.4
-4.0
–22.0
–23.5
22.5
1.2
-5.5
Default levels are denoted as follows:
10
Physical interface guide
Codec 3000 MXP
Audio Outputs 1, 2 & 3
Signal levels
Nominal
Signal
Absolute max output
level
levels
level
Input
menu
level
setting
[dBu]
[dB]
[Vpp]
–1.0
0.0
1.2
–2.5
1.5
1.4
–4.0
3.0
1.6
–5.5
4.5
1.9
–7.0
6.0
2.3
–8.5
7.5
2.8
–10.0
9.0
3.3
10.5
3.9
–11.5
12.0
4.6
–13.0
13.5
5.5
–14.5
–16.0
15.0
6.5
–17.5
16.5
7.8
–19.0
18.0
9.2
–20.5
19.5
11.0
–22.0
21.0
13.0
–23.5
22.5
15.5
This specification is always valid for output 2
and 3, and for output 1 at volume setting 15.
–31.4
TIP:
To convert dBu values to dBV,
subtract 2.2 dB from the dBu value.
EXAMPLE:
–10 dBu –12.2 dBV
NOTE:
The input clipping levels and the
absolute max output levels all assume
sinusoidal signals for the dBu values.
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Nominal
level
[dBu]
[dBu]
–5.5
–23.5
–4.0
–22.0
–2.5
–20.5
–1.0
–19.0
0.5
–17.5
2.0
–16.0
3.5
–14.5
5.0
–13.0
6.5
–11.5
8.0
–10.0
9.5
–8.5
11.0
–7.0
12.5
–5.5
14.0
–4.0
15.5
–2.5
17.0
–1.0
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