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Install Multipoint Adapters
Issue 1 September 1995
9-43
Figure 9-19. Typical Installation of Terminating Resistor Block
(110RA1-12)
Two terminal Basic Multipoint applications are accommodated by connecting
row B (output) to the second terminal common to the multipoint circuit.
Install Multipoint Adapters
Multipoint Adapters are used to provide signal fan-out of the T-interface. Fan-out
can be performed at the work station by the BR851-B or the 367A. These
adapters support more than one Integrated Services Digital Network (ISDN)
terminal per horizontal 4-pair D-Inside Wire (DIW). To support multiple horizontal
runs, fan-out must be performed in the satellite closet by a cross-connected field
with multiple common rows (or blades).
The 110RA1-12 provides fan-out for two horizontal runs and also contains the
100 Ohm terminating resistor. This can be used for Basic Multipoint or point-to-
point with terminating resistor in the closet. Other fan-out blocks include the
110AB1-025M and the 110AB1-050M.
BR851-B Adapter (T-Adapter)
The BR851-B supports two terminals on one multipoint Basic Rate Interface
(BRI) at the workstation. It is a T-shaped device used to fan-out transmission and
power. The BR851-B is an 8-position device with a single plug and two jacks.
Figure 9-20 shows the wiring diagram of the BR851-B.
1. Part terminating resistor block
2. 2-pair cross-connect
3. Row “A”
4. Row “B”
5. Row “C”
6. Basic multipoint option
7. 2-pair cross-connect
8. Part of 4-pair blue field
9. 4-pair horizontal cables
10. To Integrated Services Digital Network
(ISDN) S/T-interface terminals
11. White or purple field
12. From Integrated Services Digital
Network (ISDN) T-interface circuit
(2-pair)
Figure Notes: