DEFINITY Made Easy Tools
Issue 3, December 2001

Install Additional Hardware

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Terminating Resistor Adapter and Block

8-Wide Terminating Resistor Adapter (440A4) shows an 8-pin 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.

Terminating Resistor Block (110RA1-12) shows the wiring of the 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.

Typical Installation of Terminating Resistor Block Using Multipoint Connection shows the wiring connections for the 110RA1-12 terminal block. The TN556 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.

8-Wide Terminating Resistor Adapter (440A4)

Figure Notes:

1. 8-Wide Plug


2. Cord


3. Plastic Housing


4. 8-Wide Jack

Terminating Resistor Block (110RA1-12)

Figure Notes:

1. Circuit 1


2. Circuit 12


3. Output Row A


4. Output Row B


5. Input Row C


6. Only First Circuit Shown to All 12 Circuits (2APR) Per Block


7. 110D-4 Connector Block


8. Printed Circuit Board Mounted on Standard 110A or 100APR Block

Typical Installation of Terminating Resistor Block Using Multipoint Connection

Figure Notes:

1. Part of Terminating Resistor Block


2. White or Purple Field


3. Part of 4-Pair Blue Field


4. From ISDN T-interface Circuit (2- Pair)


5. To ISDN S/T-interface Terminals


6. 2-Pair Cross-Connect


7. Basic Multi-point Option


8. 2-Pair Cross-Connect


9. 4-Pair Horizontal Cables


10. Row A


11. Row B


12. Row C

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Copyright� 2001 Avaya Inc.

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