Datasheet

Technical Data MoRoS Modem/ISDN
44 June 06
10.6 Interface Communication Module
Phone interface (only for MoRoS Modem).
Layout of the RJ12 Connector and the RJ45 Jack
Pin Description Pin Description
1 NC (alarm) 4 b1
2 a2 5 b2
3 b1 6 NC (ground)
Meaning of the Signals:
a1, b1: Incoming phone lines (e.g. exchange connection or PBX)
a2, b2: they are used to connect a telephone in series. In idle state, a2
and b2 are connected with a1 and b1 via a loop current
connector. a2 and b2 are disconnected as soon as the modem
occupies the line.
RJ 12 plug with nose
pointing backwards
RJ 12 plug front view
E W
b2 b1
a2 a1