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Installation and commissioning of the modems and routers
5.7 Analog dial-up modem MD3
Pinout of the X3 RJ-12 jack
The X3 connector of the MD3 modem is designed as a 6-pin RJ-12 Western jack. The pinout
is shown in the following table.
Table 5- 34
Pinout of the X3 RJ-12 jack for the MD3 modem
Illustration
Standard connecting cable for the RJ-12 port
The connecting cable 6NH7700-3BR60 ships with every MD3 modem. It allows the modem
to be connected to a TAE6 telephone outlet for dial-up mode or with an LTOP voltage
protection module for dedicated line mode.
The cable is no longer available as separate spare part.
Table 5- 35
Standard connecting cable for the RJ-12 port of the MD3 modem
Order no.
Description
6NH7700-3BR60
Connecting cable with 2 x RJ-12 Western plug and snap-on
TAE6N plug to connect an MD3 modem (RJ-12) to a tele-
phone jack (TAE6N) or an LTOP overvoltage protection
module (RJ-12) in dedicated line mode.
Cable length 6 m
Note
The 6NH7700-3BR60 connecting cable has a ferrite at one of the cable ends to suppress
electromagnetic interference over the connecting cable. You should not normally remove the
ferrite. Make sure that the RJ-12 Western connector at the end of the cable with the ferrite is
connected to the modem.
204
Pin no.
Signal name
1
E
2
a2
3
b1
4
a1
5
b2
6
G
Signal direction
Ground
Bidirectional
Outgoing wire pair (along with
b2)
Bidirectional
Incoming wire pair
Bidirectional
Outgoing wire pair (along with
a2)
-
Metering pulse
Illustration
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
Remark
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