Siemens MC35 Specifications download pdf (Page 24)

MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 24 of 42 16.02.2007

3.5.3 Audio interface

The audio interface provides an analog input for a microphone and an analog output for an

earpiece.

• The microphone input and the earpiece output are balanced.

• For electret microphones a supply source is implemented.

• The microphone supply characteristics are optimized for the recommended Votronic

handset. This handset has been used as the reference handset for type approval (see

chapters

6 and 7). An extra approval must be obtained for integrating other handsets or

amplifiers.

The amplification of sending direction, receiving direction and sidetone depend on the

current audio mode.

EMC immunity complies with the vehicular environment requirements according to

EN 301 489-7.

Figure 6: Audio Western plug (4-pole female)

...0dB

speechcoder

0dB; -6db; -12dB; -18dB

+0..42dB in

6dB- steps

4k7

5.9V

6R8

(sideTone)

( ) AT parameter

(outCalibrate [n])

n = 0...4

(inCalibrate)

(inBbcGain )

(outBbcGain )

speechdecoder

Ri=2k

MICP

MICN

EPP

EPN

Figure 7: Audio block diagram

Pin assignment:

1 MICN (Microphone - )

2 EPN (Earpiece)

3 EPP (Earpiece)

4 MICP

(Microphone +)

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 41 42

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Siemens MC35 Specifications Page 24

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