Install Additional Hardware
BRI Terminating Resistor Installation
SI Installation and Upgrades
573
June 2004
Figure 227: Typical Installation of Terminating Resistor Block Using Multipoint
Connection
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)
on page 573 or the
367A Adapter
on page 574. 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
Figure 228, Wiring Diagram of BR851-B,
on page 574.
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
T
T1
R
R1
10
3
4
5
1
6
2
8
12
9
11
7
