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Install the BRI terminating resistor
116 S8100 Installation and Upgrades
November 2003
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’s 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 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.
Terminating-resistor adapter
Figure 34, 8-wide terminating-resistor adapter (440A4), on page 116 shows an 8-pin 440A4 terminating-
resistor adapter. The adapter has an 8-wide plug at 1 end, a short cord, and an 8-wide jack at the opposite
end.
Figure 34: 8-wide terminating-resistor adapter (440A4)
Figure notes
1 8-wide plug 2 8-wide jack
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RRCC
r910013 RPY012098
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