Glossary
Xn120 Getting Started Guide
57
Glossary
431A
4 way telephone plug. Also available as a 6 way plug (631A) which can be used in place
of the 431A.
CO
Central Office. The exchange line connections of the Xn120 are labelled CO1 to CO3.
CW1308
A specification for twisted pair cable, typically used for telephone system cabling.
Available from 1 to 100’s of pairs.
The cable is separated into coloured pairs, each pair is twisted together.
Dial Pulse
A method of dialing digits by breaking the line a set number times for each digit dialed.
This can also be referred to as rotary dialed digits.
DTMF
Dual Tone Multi Frequency. A method of dialing digits (0 to 9 * and #) by sending a tone
each time a button is pressed.
FSK
Frequency Shift Keying. A method of sending data by changing the frequency.
LCD
Liquid Crystal Display.
LJU
Line Jack Unit used to connect normal telephones. Also referred to as British Telecom
style socket.
Available as a Master or Secondary type. The Master has components fitted to provide
ringing and lightning protection for the phone. The Secondary does not have the
components installed and should be used to provide an additional extension from a
Master LJU.
RJ11
Type of plug/socket. There are various sizes and number of connections available. The
size and number of connections is determined by the two numbers following the type, for
example.
RJ11 4/4 way is a 4 pin type with 4 connections
RJ11 6/4 way is a 6 pin type with 4 connections
RJ11 6/6 way is a 6 way type with 6 connections
