Siemens MC35 Specifications download pdf (Page 25)

MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 25 of 42 16.02.2007

3.5.3.1 Supported audio modes

The audio interface can be configured by AT commands. Refer to [1] for details.

The electrical characteristics of the voiceband part vary with the audio mode. Specifications

are listed in

Table 24. To suit several types of audio equipment, three audio modes given by

default can be selected by the AT command AT^SNFS.

Regarding audio performance, compliance with the TS 51010-1 specification and GCF

recommendations has been certified for the parameters provided by audio mode 1 and audio

interface 1. The settings are optimized for the reference handset (type Votronic) connected

to the MC35i Terminal. To ensure that the reference parameters are always within the limits

demanded by the standards they cannot be changed by AT command. Furthermore, the

reference parameters are set as factory default.

In audio mode 4 and 5, the gain in the microphone, earpiece and the sidetone path can be

adjusted from the cellular device application by using further AT commands.

Please note that the 2

audio interface of the MC35i module is not connected in the MC35i

Terminal. Audio modes 2, 3 and 6 can be selected by setting AT^SAIC=2,1,1, for further

details refer to

[1].

Table 12: Audio modes

Audio mode number: AT^SNFS= 1 (Default settings,

not adjustable)

4 5

Audio mode name Default Handset User Handset Plain Codec 1

Purpose Recommended

handset (see chapter

User provided

handset

Direct access to

speech coder

Gain programmable via AT

command

NO YES YES

Sidetone YES YES YES

Volume control NO YES YES

Limiter (receive) YES YES NO

Echo control (send) Suppression Suppression NO

MIC input signal for 0dBm0

@ 1024 Hz

(at default gain settings)

12.5 mV 12.5 mV 315 mV

Earpiece output signal in mV eff. @

0dBm0, 1024 Hz, no load (at

default gain settings);

@ 3.14 dBm0

275 mV 275 mV

default @ max

volume

880 mV

3.7 Vpp

Sidetone gain (at default settings) 27.7 dB 27.7 dB - dB

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