Siemens SINAUT ST7 - Page 207

Installing and putting a SINAUT modem into operation
5.5 MD2 dedicated line modem
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
207
Pinout of the RJ-12 Western jack
The X3 connector is designed as a 6-pin RJ-12 Western jack. The pinout is shown in the
following table.
Table 5- 16 Pinout of the X3 RJ-12 Western jack for the MD2 modem
Illustration Pin no. Signal name Signal direction Remark
5 a1
2 b1
Input or bidirectional (channel 1) With 2-wire: Input and output
channel 1
With 4-wire: Input
4 a2
3 b2
Output or bidirectional (channel 2) With 2-wire: Input and output
channel 2
With 4-wire: Output
1 a
RTS
6
5
4
3
2
1
6 b
RTS
Output Output optical relay
The RTS signal can be output over the floating optical relay at pins 1 and 6 of the RJ-12
connector.
The technical specifications of this output are as follows:
● max. connected voltage = 60 V AC/DC
● R
ON
max = 3 ohms
● I
max
= 400 mA
A suppressor circuit does not exist for the output.
Standard connecting cable for the RJ-12 port
The connecting cable 6NH7700-2AR60 ships with every MD2 modem. This allows the MD2
modem to be connected to an LTOP overvoltage protection module. The actual connection
of the dedicated cable is on the LTOP overvoltage protection module using screw terminals.
The connecting cable can also be ordered as a spare under the number shown.
Table 5- 17 Standard connecting cable for the MD2 modem
Order no. Description Illustration
6NH7700-2AR60 Connecting cable with 2 x RJ-12 Western plugs for
connection of an MD2 modem (RJ-12) to an LTOP
overvoltage protection module (RJ-12).
Cable length 6 m
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