DEFINITY Made Easy Tools
Issue 3, December 2001

Install Additional Hardware

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Installing Multipoint Adapters

Multipoint adapters are used to provide signal fanout of the T-interface. Fanout can be performed at the work station by the BR851-B Adapter (T-Adapter) or the 367A Adapter. These adapters support more than one ISDN terminal per horizontal 4-pair D-inside wire (DIW). To support multiple horizontal runs, fanout must be performed in the satellite closet by a MDF with multiple common rows. The 110RA1-12 provides fanout for two horizontal runs and contains the 100 Ohm terminating resistor. This can be used for basic multipoint or point-to-point with terminating resistor in the closet. Other fanout blocks include the 110AB1-025M and the 110AB1-050M.

BR851-B Adapter (T-Adapter)

The BR851-B supports two terminals on one multi-point BRI at the work station. It is a T-shaped device used to fanout transmission and power. The BR851-B is an 8-pin device with a single plug and two jacks. See Wiring Diagram of BR851-B.

367A Adapter

The 367A is an 8-conductor adapter used at the work location to bridge 3 to 7 terminals. See Wiring Diagram of 367A Adapter.

Wiring Diagram of BR851-B

Figure Notes:

1. Wire Pairs


2. Pin Numbers


3. Modular Plug (Male)


4. Female


5. Two 8-pin Modular Jacks


6. T-Type Adapter

Wiring Diagram of 367A Adapter

Figure Notes:

1. Jack 1


2. Jack 2


3. Jack 8


4. 367A Adapter

Basic Multipoint Installation Distances

Basic Multipoint with One Work Location provides cabling information for fanout of ISDN-BRI multipoint installations. In this illustration, the terminating resistor is located in the satellite closet. All distances assume 24 AWG (#5) (0.5 mm 2) D-Inside Wire (DIW).

Basic Multipoint with One Work Location

Figure Notes:

1. S-Interface Source (TN556)


2. Terminating Resistor


3. Satellite Closet


4. Maximum Distance from S-Interface Source to Work Location (1600 Feet) (488 m)


5. Maximum Distance From Terminating Resistor to Work Location (250 Feet) (76 m)


6. System Cabinet


7. Terminating Endpoint 1


8. Terminating Endpoint 2


9. Work Location


10. Maximum Distance from Information Outlet to Terminating Endpoint (33 Feet) (10 m)


11. Information Outlet

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Copyright� 2001 Avaya Inc.

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