Characteristics Of The Audio Interface; Table 31: Characteristics Of The Audio Interface - Siemens TC65 Terminal Hardware Interface Description

TC65 Terminal Hardware Interface Description
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5.6

Characteristics of the Audio Interface

Table 31: Characteristics of the audio interface

Function Signal name
Microphone MICP, MICN
Earpiece EPP, EPN
LEAudio
Unless otherwise stated, all specified values are valid for gain setting (gs) 0dB and 1kHz
test signal.
gs = 0dB means audio mode = 5, inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0,
OutCalibrate = 16384, sideTone = 0.
The electrical characteristics of the voiceband part depend on the current audio mode
selected by the AT command AT^SNFS. See Table 11: Audio modes.
The audio modes 4 and 5 can be adjusted by parameters. Each audio mode is assigned a
separate parameter set.
7
At least one of the following conditions has to be met in order to exceed U
voltage limit U = 1.6Vpp:
ires
- A call is established
- The module is not in power down and the AT command "AT^SNFM=,1" was executed.
If 0.6Vpp is exceeded under any other condition undervoltage shutdown may be caused.
TC65 Terminal_HD_V02.000b
IO Parameter
DC (no load) at MICP
DC at MICP
in POWER DOWN
DC (no load) at MICN
DC Resistance differential
MICN, MICP (balanced)
Impedance
Zi (balanced)
I
Input level Uimax
Restricted Input level Uires
Gain range
6 dB steps
Frequency Range
fine scaling by DSP
(inCalibrate)
Impedance
(balanced)
AC output level UO
Gain = 0dB @ 3.14 dBm0
no load
Gain range
O
Gain accuracy
Frequency area
DC Offset
(balanced)
Attenuation distortion
for 200...3900Hz
Out-of-band discrimination
Length of Audio (Handset)
cable
Page 55 of 65
s
Min. Typ. Max.
5.3 5.4 5.6
0V
0
4.6 4.7 4.8
3.9 4.0 4.1
0.6
7
1.6
0 42
200 3900
-∞ 0
8
5.97
-18 0
0.8
200 3900
100
1
70
3
= 0.6 Vpp up to the restricted
imax
Unit
V
V
V
kOhm
kOhm
V
PP
V
PP
dB
Hz
dB
Ohm
V
PP
dB
dB
Hz
mV
dB
dB
m
19.02.2007