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i2022 ISDN Teleset
7
Figure 4: Using Lucent 1215B Power Supply
Figure 5: Powering a Teleset (S/T) with an External Power Supply
Fig. 5 shows an i2022 connected to an S/T Interface. The U Interface is connected to the NT1. The output of the NT1 is
an S/T Interface with power for the Teleset. The S/T Interface with power cable is connected to the “Line-In” jack located
on the S Interface Module in the rear of the Teleset. The i2022 S Teleset must be connected through a network interface
device (NT1). This device presents the 2-wire U Interface to the line, and the 4-wire S/T Interface to the Teleset. The
Teleset is usually powered from the NT1 or a separate transformer.
OUT IN
Lucent
i2022
A
UX
EM-32
EM-32
Pin 4-5: S/T
Interface
Pin 3-6: S/T
Interface
Pin 7-8: Power
TIS-1215B
Power
Adapter
A
C 120V
Pin 4-5: S/T
Interface
Pin 3-6: S/T
Interface
Power Ada
p
ter
AC
120V
U Interface
S/T Interface
Pin 4-5
Pin 4-5: S/T Interface
Pin 3-6: S/T Interface
Pin 7-8: Power
S/T Interface
Pin 4-5
Pin 3-6
U Interface
Pin 4-5
U
Interface
Pin 7-8
Power
TIS-1215B
OUT
IN
TIS-1215B
OUT
IN
Power Ada
p
ter
AC
120V
NOTE: Because of the high power requirements of the 2022, it is recommended powering telesets equipped with
EM-32 modules locally.
NOTE: Because of the high power requirements of the 2022, it is not recommended powering extended S/T devices
from a common power supply.