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Installation and commissioning of the modems and routers
5.5 MD2 dedicated line modem
Table 5- 15
Default settings for the WAN terminating resistors
Attachment type
End point
2-wire (channel 1)
2 x 2-wire (channel 1+2)
4-wire
Tapping point
2-wire (channel 1)
Tapping point
4-wire
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
The RTS signal can be output over the floating optical relay at pins 1 and 6 of the RJ-12
connector.
168
Baud rate
Setting on DIL switch
1200 bps
2400 bps
9600 bps
19200 bps
1200 bps
2400 bps
9600 bps
19200 bps
1200 bps
2400 bps
9600 bps
19200 bps
Pin no.
Signal name
5
a1
2
b1
4
a2
3
b2
1
a
RTS
6
b
RTS
Remark
The MD2 is located at the beginning or end of
a 2-wire or 4-wire line and is set to a trans-
mission speed of 1200 or 2400 bps.
End point as above but with transmission
speed set to 9600 or 19200 bps.
The MD2 is not located at the beginning or
end of a 2-wire line; it taps into this 2-wire line
along the way with high resistance. The
transmission speed is set to 1200 or 2400
bps.
End point as above but with transmission
speed set to 9600 or 19200 bps.
The MD2 is not located at the beginning or
end of a 4-wire line; it taps into this 4-wire line
along the way with high resistance.
Signal direction
Input or bidirectional (channel 1)
Output or bidirectional (channel 2)
Output
System Manual, 09/2016, C79000-G8976-C178-10
Remark
With 2-wire: Input and output
channel 1
With 4-wire: Input
With 2-wire: Input and output
channel 2
With 4-wire: Output
Output optical relay
SINAUT ST7 station control system
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