Nortel Networks i2021 Series - Manual (Page 10)

i2021 ISDN Teleset
4
INSTALLATION
Before installing your phone, review the Safety Instructions located at the
front of this manual. Make sure you have the correct model Teleset and
associated parts for your applications. Choose a flat work surface with
good lighting and easy access to cords and jacks. Avoid placing the
Teleset where it is exposed to sunlight or heat sources.
Parts List
Check the box for the following:
Teleset
Handset and Handset Cord
Mounting Cord (8-pin, round)
Designation Card and Faceplate
Wall-Mount /Desk Stand Base
Handset Holder
Logo Plate
As you unpack the box, inspect each part carefully for damage. Report
any damage to your dealer or shipping company. Keep the box and
packing material should a return be necessary.
ISDN Interfaces
A little background information sometimes helps. Your ISDN service
comes to you over ordinary telephone line wiring. That makes it less
expensive and simple to install.
The service provider (telephone company) usually provides a 2-wire
interface, called a U interface to the customer. The i2021 is a Basic Rate
ISDN, S/T interface device. An NT1 device is required to convert the 2-
wire U interface from the service provider to a 4-wire S/T interface. See
Fig. 2.
The S/T interface and power connection cable is connected to the “Line-In”
jack located on the bottom of the Teleset. The i2021 S Teleset must be
connected through a network interface device (NT1). This device presents
the 2-wire U interface to the line, and to the 4-wire S/T interface to the
Teleset. The Teleset is usually powered from the NT1 or separate
transformer.