NEC XN120 User Manual page 21

Configuration sheet: Expansion Unit Port Assignment (base board ports)
Each expansion unit has 8 telephone (ST) ports and 3 exchange line (CO) ports.
Slot
number in
XN120 unit
Program
10-03-01
Slot 1
Base board
Main unit
Slot 7
Base board
Expansion
1
Slot 13
Base board
Expansion
2
XN120 Expansion Unit Guide
Exchange
Telephone
port Line port
numbers. numbers.
ST Sockets.
CO Sockets.
1-8 1-3
Connect the Power & Start Up
21