NEC XN120 - What Is the XN120 Expansion Unit; System Capacities; Identifying the Expansion Unit

XN120 Expansion Unit
XN120 Expansion Unit Guide 3
What is the XN120 Expansion Unit
The XN120 expansion unit is connected to the
XN120 main unit to increase the capacity of the
system.
The XN120 main unit must have the
Applications Card (EXIFU-A1) installed before
you can connect an expansion unit.
The system will allow up to 2 expansion units to
be connected to the XN120 main unit.
The expansion unit is supplied with three
exchange lines and eight telephone ports.
The quantity of ports can be increased by
adding optional expansion cards.
The expansion unit does not have the external
music input/external page output socket; this is only on the XN120 main unit. Additional external audio devices
are connected via the 2PGDU cards that can be installed into any unit.
It can also accommodate optional parts to connect ISDN BRI lines.
Separate guides are supplied with the optional equipment.
System Capacities
The maximum capacities of the XN120 system are shown below.
Other factors may limit the maximum quantity; refer to the individual guides supplied with each item.
Description Maximum
Quantity
Comments
XN120 Main unit 1
XN120 Expansion unit 2
Exchange lines 51 27 Analogue lines
40 BRI lines (20 circuits)
Telephones 72 System phones, normal phones and 64 button consoles
24 Button Add On console 72 Connects to a Vision phone
64 Button console 9 Connects to port 8 of each unit/card
Door phone unit 6 2 per 2PGDU card
External paging zones
External music inputs
6
2 connections per 2PGDU card and 1 on the XN120 main
unit
Identifying the Expansion Unit
The expansion unit looks identical to the main unit when the covers are fitted.
The units can be identified by the label on the left side of the unit.
The main unit is labelled IP2AT-924M KSU
The expansion unit is labelled IP2AT-924ME KSU