Audio Interface - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
4.4

Audio interface

Signal Function
MICP Microphone plus
MICN Microphone minus
SPP Speaker plus
SPN Speaker minus
BUZZER Buzzer
HOOKSW Hookswitch
Note:
1
) F = 10^((3*inBbcGain)/20) (for parameter "inBbcGain", see description of command AT^SNFI in Chapter
scale
mens-defined AT commands for enhanced functions" on page 111
The microphone should comply with the following technical data:
Sensitivity
Impedance
Bias voltage
Input current
Signal-to-noise ratio
Technical data of the speaker:
Volume
Impedance
THD
Version 8 dated 15.03.00
I/ Level
O
1
I Vpp(V): )
typ.: 1.0954 / F
scale
max.: 1.578 / F
scale
1
I Vpp(V): )
typ.: 1.0954 / F
scale
max.: 1.578 / F
scale
O Vpp(V):
nom.: 2.1909
max.: 3.156
O Vpp(V):
nom.: 2.1909
max.: 3.156
O 1.2 V - 1.35 V
I 2.8 V
-37 ± 2 dB (500 Hz, 0 dB = 1 V/Pa, v = 0)
2 kΩ ± 30% (1 kHz)
1.5 V DC (1–10 V DC)
≤ 300 µA
≤ 66 dB
(97.0 ± 2) dB SPL
Ω
150 ± 30
≤ 4% (800 Hz, 104 dB SPL)
≤ 2% (300–3400 Hz, 94 dB SPL)
Comments
Differential input; must be AC-coupled;
input resistance: 11–22 MΩ
Note: may be disconnected if unused
Differential Input; internally; must be AC-coupled; in-
put resistance: 11–22 MΩ
Note: may be disconnected if unused
min. load resistance: 32 Ω
max. load capacitance: 100 pF
should be AC-coupled
Note: may be disconnected if unused
min. load resistance: 32 Ω
max. load capacitance: 100 pF
should be AC-coupled
Note: may be unconnected if unused
> 2 kOhm, < 50 pF,
used only with integrated MMI
Note: may be disconnected if unused
used only with integrated MMI
ON-HOOK = 0V
OFF-HOOK = 2.1 - 3 V
if unused, connect to a 10 kOhm - 100 kOhm pull-down resi-
stor
)
Hardware interfaces
5.7 "Sie-
A
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