NEC EXIFU-A1 Installation, Configuration And Operation page 7

Install the EXIFU Card
5 Power on the XN120 system If you have any expansion units installed you must power these on
first.
The EXIFU card will be automatically configured.
! System Start Up – Retain Customer Configuration
This is the normal operation for powering the XN120 on.
Before you power on the system check that the NORMAL switch is set
to ON. This will ensure that the system memory retains your
configuration.
The NORMAL switch is located to the right of the MOH/Page
connector on the main unit; refer to the Getting Started Guide supplied
with the XN120 for further information.
XN120 EXIFU Guide 7