Nortel Networks i2021 Series - Manual (Page 11)

i2021 ISDN Teleset
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Fig. 2: Line and Power Jacks
Line and Power Connections – i2021 Teleset
The i2021 Teleset must be connected to the line through an NT1 device.
This device presents the 2-wire U interface to the line, and the 4-wire S/T
interface to the Teleset. The Teleset is powered over the phone line. This
method conforms to a standard using one of two different powering
methods: PS1or PS2. Powering method PS2 is preferred. Check with
your equipment provider or system administrator for guidance in setting
the PS1/PS2 switch. Your equipment provider should also be asked about
using or disabling the Teleset terminating resistors (TR).
SWITCH SETTINGS:
n POWER SWITCH
The PS1/PS2 power switch is located on the bottom of the i2021.
n TR SWITCH
When the i2021 Teleset is connected to the NT1 it acts as Terminal
Equipment (TE). Terminal Equipment is any (ISDN) device that
terminates directly on the ISDN line without a Terminal Adaptor.
If your Teleset is the last, or only, piece of TE on the ISDN line, set the TR
to ON, otherwise it is set to OFF. This is determined by the local
equipment provider’s policy. It is suggested that you check with the ISDN
provider or your system administrator. Most companies allow up to eight
TE units in the loop.