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 Headset Adapter 
attached to any currently manufactured analog, digital communications 
protocol, or Integrated Services Digital Network (ISDN)-T telephone equipped 
with an Adjunct jack.
!CAUTION:
The MSP-1 Power Su p ply can be used only with telecommunications 
equipment, indoors, and in a controlled environment.
The MSP-1 Power Su p ply has a single output of -48VDC, 0.4 amperes, and can 
operate from either a 120 VAC 60 Hz Power source (105 to 129 VAC) or a 230 
VAC 50 Hz Power sourc e (198 to 264 VAC). Input voltage selection is automatic; 
that is, the power supply adjusts itself for the type of input voltage. The output 
capacity is 19.2 watts.
Locate the MSP-1 Power Supply
You may set the MSP-1 power supply on a flat surface such as a desk. Ad hesive 
fastener strips are p a cked with the MSP-1. These are used to mount it on a 
vertical surface such as a wall.
!CAUTION:
Do not locate the MSP-1 within six inches of the floor. Experience has 
proven that the MSP-1 will not survive the hazards of locating it near the 
floor.
Mount the MSP-1 Power Supply
The double-sided adhesive fastener strip allows you to mount the power supply 
on a flat vertical surface, such as on the wall or on the side of the desk.
Use the following procedure to mount the power supply near the telephone.
1. Locate a clean flat vertical surface on which to mount the power supply.
2. Peel the paper backing from one of the adhesive strips.
3. Firmly press the strip to the mounting surface. The fastener side of the 
strip should be directed outward.
4. Peel the paper backing from the remaining adhesive strip. 
						

							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 without an adjunct.
The maximum loop range between the telephone and the power supply is 250 
feet (76 meters).
The power output is provided through 3 modular jacks on the power supply. 
These jacks are labelled as shown:
The PHONE and LINE jac k s are 8-pin female non-keyed 657-type jacks that can 
accept D4, D6, and D8 modular plug cables. The OTHE R ja ck is a 6 -p in fe mal e 
non-keyed 657-type jack.
The powering arrangements shown in the following figures can be used with the 
MSP-1 Power Su p ply.
nFigure 9-15 shows the local powering arrangement for Integrated 
Services Digital Network (ISDN) telephones, the Digital Communications 
Protocol (DCP) 7444 telephone voice frequency (VF) display, 84xx 
telephones, and adjuncts connected to all telephones except the 8102.
nFigure 9-16 shows the local powering arrangement for adjuncts 
connected to the 8102 telephone.
The type of cord(s) needed to make these connections are designated in each 
figure.PHONE OTHER LINE
-7 +8 -2 +5
The - and  +  numbers refer to the pins on which 
power is present and the polarity of that power. 
						

							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
Figure Notes: 
						

							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
1. MS P-1  Po we r Su p p l y
2. D4BU Cord
3. Adjunct jack (on rear of telephone)
4. Power Jac k
5. Line Jack
6. D4BU Cord or 2-Wire Cord7. Wall Jack
8. Bottom of 8102 Telep hone
9. “PHONE Jac k
10. “OTHER” JAck
11. “LINE” Jack
Figure Notes: 
						

							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:
The 440A4 terminating resistor and 110RA1-12 terminating resistor block 
are Underwriters Laboratories (UL) listed. Most new installations will be of 
the 110RA1-12 terminating resistor block. The following installation 
instructions should be observed and heeded when installing a terminating 
resistor (TR) or any telephone equipment.
nNever install telephone wiring during a lightning storm.
nNever install telephone jacks in wet locations unless the jack is 
specifically designed for wet locations.
nNever touch uninsulated wires or terminals unless the telephone line has 
been disconnected at the network interface.
nUse caution when installing or modifying telephone lines.
Terminating Resistor Adapter
Figure 9-17 shows an 8-p in 440A4 terminating resistor (TR) adapter. The 
adapter is three inches long with p lugs at both ends and a short c ord  to c onnect 
the 8-conductor jack. When is connected, a small sc rewdriver is needed for 
removal.
1
2
3
4
5
6
7
81
2
3
4
5
6
7
8
3
41
2
R RCC 
						

							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 110D-4 connector blocks are mounte d 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 assemb ly 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.
1 . 8-W i d e Plu g
2. Cord3. Plastic Housing
4 . 8-W i d e Ja c k
3
8
4
5
1
6
2
7 145246347448 
						

							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 Pair 3 of the station field.
1. Circuit 1
2. Circuit 2
3. Output row “A”
4. Output row “B”
5. Input row “C”6. Only first circuit shown to all 12 circuits 
(2A PR) p e r  b l o c k
7. 110D-4 connector block
8 . Pri nte d  c i r c u it boa r d  mo un te d  o n 
standard 110A, 100APR block
Figure Notes:
1
2
11
T R T1 R1
1267
8
9
10
3
4
5 
						

							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 Integrated Services Digital Network (ISDN) 
terminal p er horizontal 4-pair D-Inside Wire (DIW). To support multiple horizontal 
runs, fan-out must b e performed in the satellite closet b y 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 p oint-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 bloc k
2. 2-pair cross-connect
3. Row “A”
4. Row “B”
5. Row “C”
6. Basic multipoint option
7. 2-pair cross-connect8. 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 -in te rfa c e  ci rcu it
(2-pair)
Figure Notes: 
						

							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. Wire Pairs
2. Pin Numbers
3. Modular Plug (Male)4. Female
5. Two 8-pin Modular Jac ks
6. T-Type Adapter 
						

							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).
Table 9-10. Cabling Distances for Figure 9-22
Abbreviation Description
A Distance from the T-interface source to the work location
B Distance from the closet to the work location
C Less than 33 feet (10 meters) of cord 
312 88 877 766 655 544 433 322 211 1
4
1. Jack 1
2. Jack 23. Jack 8
4. 367A Adapter