Datasheet

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 plu

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