ATT DEFINITY Communications System Generic 3 For Single-Carrier Cabinets Instructions Manual

9-3 6Issue 1  September 1995  
Description of the MSP-1 Power Supply
The MSP-1 (WP92464L1) Power Su p ply can be used  to supply local power to 
Attendant Console 302B, Integrated Services Digital Network (ISDN) -T 75xx, 
and 85xx series telephones connected to an AT&T DEFINITY  Co mm unications 
System and to telephones needing auxiliary power for their vacuum fluorescent 
display. The MSP-1 can also supply auxiliary power to adjunct equipment such 
as the S201A and CS201A sp eaker phones or a 500A...

Install the MSP-1 Power Sup p ly
Issue 1  September 1995 
9-3 7
5. Place the adhesive side on the top of the MSP-1 and press the strip 
d own so it adheres to the surface. Do 
not place the strip on the bottom 
of the power supply where the rubber feet are located.
6. Carefully align the fastener surface on the top of the power supply with 
the fastener surface on the wall or desk and press the two surfaces 
together firmly.
Connect the Power Supply
One p ower supply will support one telephone with or...

9-3 8Issue 1  September 1995  
Figure 9-15. MSP-1 Connections for -48V Powered Telephones 
and their Adjuncts (Except the 8102)
3
8
4
9
5
10
1
6
2
7
1. MSP-1 Power  supply
2. D8W cord
3. D4BU cord (For analog telephones) or 
D8W   c o r d  (F or D igi tal  Co mm u ni c a tio ns 
Protocol (DCP) an d Integrated Services 
Digital Network (ISDN-T) tele phones)
4. Wall jac k5. Adjunct jack
6. Line jac k
7. Bottom of Voice Terminal/Tele phone 
(7444 Shown)
8. “PHONE” Jac k
9. “OTHER” Jack
10. “LINE” Jack...

Install the Basic Rate Interface (BRI) Terminating 
Resistor
Issue 1  September 1995 
9-3 9
Figure 9-16. MSP-1 Connections for Adjuncts Connected to 
the 8102 Analog Telephone
Install the Basic Rate Interface (BRI) 
Terminating Resistor
A terminating resistor is always required when the Basic Rate Interface (BRI) 
T-type interface card (TN556 circuit pack) is used (see 
#5ES S Swit ch Int e grated 
Services Digital Network Customer Premises Planning Guide Issue 7, 
533-700-
100.
3
8
4
9
5
10
1
6
2
7
11...

9-4 0Issue 1  September 1995  
The resistors balance the cable plant b etween the receiver and the transmitter 
on the T-type interface. The resistor is built into the NT1 and can be one of three 
values, depending on the configuration and the distance from the NT1 to the 
Integrated Services  Digital  Network (ISDN) terminal. The resistor value is 
controlled from the NT1. In some cases, a terminating resistor (TR) ad a pter is 
needed and can be placed in the satellite closet or work location.
NOTE:...

Install the Basic Rate Interface (BRI) Terminating 
Resistor
Issue 1  September 1995 
9-4 1
Figure 9-17. 8-Pin Terminating Resistor Adapter (440A4)
Closet Mounted (110RA1-12)
The 110RA1-12 terminating resistor block is designed to mount in the 
telecommunications wire closet. It consists of 12 (2-pair) circuits and provides 
the 100 Ohm termination used for Integrated Services Digital Network (ISDN) 
Basic Rate Interface (BRI) circ uits. Figure 9-18 shows the wiring of the 
110RA1-12. Three rows  of...

9-4 2Issue 1  September 1995  
Figure 9-18. Terminating Resistor Block (110RA1-12)
Figure 9-19 shows the wiring connections for the 110RA1-12 terminal block. The 
TN556 Basic Rate Interface (BRI) switch p ort is terminated to the bottom row C.
For point-to-point applications, the top row is connected to the blue station field. 
Notice 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...

Install Multipoint Ad apters
Issue 1  September 1995 
9-4 3
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 multi point circuit.
Install Multipoint Adapters
Multipoint Ad apters 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...

9-4 4Issue 1  September 1995  
Figure Notes:
Figure 9-20. Diagram of BR851-B
367A Adapter
The 367A Adapter (Figure 9-21) provides fan-out for up to seven terminals. The 
367A is an 8-conductor adapter and is used at the work location for bridging 
three to seven terminals. Order D8W cord for input when using the 367A. It can 
be adhesive mounted or screw mounted.
3
44
5
11
1
22
2
44 4
RR R
88 8
44 4
TT T
77 7
33 3
RR R
66 6
11 1
TT T
55 5
11 1
RR R
44 4
33 3
TT T
33 3
22 2
RR R
22 2
22 2
TT T
11 16
1....

Install Multipoint Ad apters
Issue 1  September 1995 
9-4 5
Figure Notes:
Figure 9-21. Diagram of 367A
Basic Multipoint Installation Distances
Figure 9-22, Table 9-11 and Table 9-12 provide cabling distances for fan-out of 
Integrated Services  Digital  Network Basic Rate Interface (ISDN-BRI) multipoint 
installations. Cabling distances are a b breviated in the figure as follows:
In Table 9-10, the terminating resistor (TR) is located in the closet. All distances 
assume 24-gauge D-Inside Wire (DIW)....