Installation and Upgrades for DEFINITY ONE and
IP600 Internet Protocol Release 10
555-233-109
Issue 6
December 2001
Install and Cable the Cabinet
1-113Install the BRI terminating resistor
1
Install the BRI terminating resistor
The resistors balance the cable plant between the receiver and the transmitter on
the interface. When using the TN2198 ISDN-BRI 2-Wire U Interface circuit pack,
use an NT1.
A terminating resistor is always required near the terminal when the BRI S-type
interface circuit pack (TN556 BRI 4-Wire S-NT Line circuit pack) is used (see
#5ESS Switch Integrated Services Digital Network Customer Premises Planning
Guide
, 533-700-100).The resistor is built into the NT1 and can be 1 of 3 values,
depending on the configuration and the distance from the NT1 to the ISDN
terminal. The NT1 controls the resistor value; if needed, place a terminating
resistor adapter near the terminal and in the satellite closet or work location.
!
DANGER:
The 440A4 terminating resistor and 110RA1-12 terminating resistor block
are Underwriter Laboratories (UL) listed. Most new installations are the
110RA1-12 terminating resistor block. Observe the following installation
instructions:
■
Never install telephone wiring during a lightning storm.
■
Never install telephone jacks in wet locations unless the jack is
specifically designed for wet locations.
■
Never touch uninsulated wires or terminals unless the telephone line
has been disconnected at the network interface.
■
Use caution when installing or modifying telephone lines.
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