INSYS Modem 336/56k 4.1 (UL)
Technical
Data
13.5
Telephone Interface
RJ 12 plug with nose
to the back
E W
b2 b1
a2 a1
RJ 12 plug front
Layout of the RJ12 Connector and the RJ45 Jack
Pin
Description
Pin
Description
1 NC
4
b1
2 a2
5
b2
3 b1
6
NC
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 mo-
dem occupies the line.
For the INSYS Modem 56k 4.1 UL, the following applies:
Attention! The used phone cords must have the type AWG 26. De-
vices connected to the RJ45 or the J30 20-17 connection
must comply with the requirements of UL 60950, sec-
tion 6.
July 06
93
