Audio Signal Levels In Vpp And Dbu - Cisco MXP Series The Physical Interface Manual

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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