Siemens M20 Terminal User Manual

Hardware interfaces
Version 8 dated 15.03.00 25
Siemens Information and Communication Products
A
4.4 Audio interface
Note:
1
) F
scale
= 10^((3*inBbcGain)/20) (for parameter "inBbcGain", see description of command AT^SNFI in Chapter 5.7 “Sie-
mens-defined AT commands for enhanced functions” on page 111
)
The microphone should comply with the following technical data:
Technical data of the speaker:
Signal Function
I/
O
Level Comments
MICP Microphone plus I Vpp(V):
1
)
typ.: 1.0954 / F
scale
max.: 1.578 / F
scale
Differential input; must be AC-coupled;
input resistance: 11–22 MΩ
Note: may be disconnected if unused
MICN Microphone minus I Vpp(V):
1
)
typ.: 1.0954 / F
scale
max.: 1.578 / F
scale
Differential Input; internally; must be AC-coupled; in-
put resistance: 11–22 MΩ
Note: may be disconnected if unused
SPP Speaker plus O Vpp(V):
nom.: 2.1909
max.: 3.156
min. load resistance: 32 Ω
max. load capacitance: 100 pF
should be AC-coupled
Note: may be disconnected if unused
SPN Speaker minus O Vpp(V):
nom.: 2.1909
max.: 3.156
min. load resistance: 32 Ω
max. load capacitance: 100 pF
should be AC-coupled
Note: may be unconnected if unused
BUZZER Buzzer O 1.2 V - 1.35 V > 2 kOhm, < 50 pF,
used only with integrated MMI
Note: may be disconnected if unused
HOOKSW Hookswitch I 2.8 V 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
Sensitivity -37 ± 2 dB (500 Hz, 0 dB = 1 V/Pa, v = 0)
Impedance 2 kΩ ± 30% (1 kHz)
Bias voltage 1.5 V DC (1–10 V DC)
Input current ≤ 300 µA
Signal-to-noise ratio ≤ 66 dB
Volume (97.0 ± 2) dB SPL
Impedance 150 ± 30
Ω
THD ≤ 4% (800 Hz, 104 dB SPL)
≤ 2% (300–3400 Hz, 94 dB SPL)

Siemens M20 Terminal Specifications

General

Brand	Siemens
Model	M20 Terminal
Category	Engine
Language	English