Avaya MCC1 Installation And Upgrades page 571

Important Warning for Telephone Wiring
Observe these precautions:
•
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 and Block
Figure 225, 8-Wide Terminating Resistor Adapter (440A4),
terminating resistor adapter. The adapter is three inches long with an 8-wide plug at one end, a short cord,
and an 8-wide jack at the opposite end.
The 110RA1-12 terminating resistor block is designed to mount in the telecommunications wire closet. It
consists of twelve 2-pair circuits and provides the 100 Ohm termination used for ISDN-BRI circuits.
Figure 226, Terminating Resistor Block (110RA1-12),
Three rows of 110D-4 connector blocks are mounted on a printed wire board along with circuit resistors
and capacitors. The bottom row is designated as the input row and the top and middle rows are designated
as the output rows. The circuit assembly is mounted on a standard 110A-100 pair mounting base. The
110RA1-12 is shipped with preprinted designation strips to simplify circuit identification and installation.
Figure 227, Typical Installation of Terminating Resistor Block Using Multipoint Connection,
573 shows the wiring connections for the 110RA1-12 terminal block. The TN556D BRI switch port is
terminated to bottom row C.
For point-to-point wiring, the top row is connected to the blue station field. The pair connects from the
110RA1-12 to the standard 4-pair circuit. Pair 1 from the 110RA1-12 is connected to Pair 1 of the station
field, and Pair 2 is connected to Pair 3 of the station field.
Two terminal basic multi-point applications are accommodated by connecting row B (output) to the
second terminal common to the multi-point circuit.
SI Installation and Upgrades
June 2004
Install Additional Hardware
BRI Terminating Resistor Installation
on page 572 shows an 8-pin 440A4
on page 572 shows the wiring of the 110RA1-12.
on page
571