Fig. 9-3 Front View Of Western Plug 4-4 (Male) - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
4-pole Western plug (female)// handset
Pin Usage
1 Microphone (-)
2 Speaker (-)
3 Speaker (+)
4 Microphone (+), app. 5 V DC to pin 1 for supplying an electret microphone
Fig. 9-3 Front view of Western plug 4-4 (male)
9-pole (female) SUB-D plug for V.24/V.28 serial interface, 1:1 cable connection (pin-to-pin) to a serial computer
interface
Pin Comp.I/O
1 I
2 I
3 O
4 O
5 –
6 I
7 O
8 I
9 I
Note:
The active logic level is +-5V
Detection of logic high level at U > 1,8V typ. (2,4V max.)
Detection of logic low level at U < 1,5V typ. (0,8V min.)
Version 8 dated 15.03.00
Usage/computers point of view
DCD In Data Carrier Detect
RXD In Receive Data
TXD Out Transmit Data
DTR Out Data Terminal Ready
GND – Ground
DSR In Data Set Ready
RTS Out Request To Send
CTS In Clear To Send
RI In Ring Indicator *
M20 Terminal
A
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