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

							Install and Connect the Cabinets
4-4Issue 1  September 1995 
Figure 4-2. Typical AC Power and Grounding Arrangement
for Single-Carrier Cabinet (Rear View)
ON ON
OFF OFF
ON ON
OFF OFFON ON
OFF OFFON ON
OFF OFF
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1. Expansion Port Network (EPN) Con tro l 
Cabinet A
2. Circuit breaker
3. Power sup ply
4. Power receptacle in power supply
5. Processor Port  Network (PPN) Control 
Cabinet A
6. Cabinet-stac k single-point ground block
7. Power cord 2.5 meters8. National Electrical Manufacturer’s 
Association (NEMA) 5-15 or National 
Electrical Manufacturer’s Association 
(NEMA)5-20 receptacle or equivalent 
locally provided receptacles
9. 6 AWG  ground  wire to approved ground
10. Generic 3 Management Terminal (G3-MT)
11. 10 AWG Coupled  Bond in g Cond uc tor
12. 6 AWG  cabinet-stack  ground conductor
13. Port cabinet
Figure Notes: 
						

							Connect Battery Leads
Issue 1  September 1995 
4-5
Connect Battery Leads
To prevent the batteries from discharging, the control c a binet is shipped with 
the battery lead disc onnected. To connect the batteries, perform the following: 
At cabinet(s):
1. Ensure the circuit breakers on each cabinet are OFF.
Each cabinet has its own power supply and the circuit breaker is located 
on the rear of each power supply. See Figure 4-3. 
2. Connect the battery lead:
See Figure 4-3. The b attery is near the top of the carrier toward  the front-
right. The  battery leads should be immediately next to the battery, on the 
left side, and accessible from the front of the c a binet.
Figure Notes:
1. Battery
2. Circuit Breaker
3. Ground block
Figure 4-3. Single Carrier Cabinet Control Cabinet
Battery Location, Right Side View
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							Install and Connect the Cabinets
4-6Issue 1  September 1995 
Connect Power
Connect either AC or DC power as d esc rib e d in this section.
Verify the label near the circuit breaker on the power supply toward the rear of 
each cabinet corresp onds to your local voltage type.
!DANGER:
If the label is different than the voltage type at your site, notify your A T & T 
representative immediately for a replacement power supply. Do not, under 
any circumstances, connect to power!
Connect AC Power
Figure 4-2 applies to multiple Processor Port Networks (PPN) and Expansion 
Port Network (EPN) c a binet arrangements. If multiple Expansion Port Network 
(EPN ) cabinets are required, you must provide the receptacles for the 4-cabinet 
Processor Port Network (PPN) arrangement in addition to the receptacles for a 
2-, 3-, or 4-cabinet Expansion Port  Network (EPN) arrangement. Provide one 
receptacle per single-carrier cabinet.
1. Verify the circuit breakers are OFF .
2. Connect cabinet AC line cords to the AC power receptacles. The AC line 
cords for the cabinets must first be connected to the cabinets and then to 
the AC power receptacles.
Connect DC Power
The following procedures apply to both the Processor Port Networks (PPN) and 
Expansion Port Networks (EPN).
Figure 4-4 shows a typical power and grounding layout for a DC-powered 
single-carrier cabinet. The size of the wire required for the -48 VDC and -48 volt 
return must ensure the -48 VDC supplied by the b attery plant to the cabinets will 
be maintained between -42.5 and -52.5 volt DC. This ensures proper operation 
and prevents hardware d amage. 
						

							Connect Power
Issue 1  September 1995 
4-7
GRD
-48V
-48V RTN
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GRD
-48V
-48V RTN
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GRD
-48V
-48V RTN
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GRD
-48V
-48V RTN
1
-48V
RTN
-48V
GRD
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(-48V RTN & GRD)
75A-48V
-48V
GR D
GR D
-48V
-48V RTN
75A 
						

							Install and Connect the Cabinets
4-8Issue 1  September 1995 
Figure 4-4. Typical Single-Carrier Cabinet System Direct
Current (DC) Power and Grounding Wiring
!CAUTION:
Grounding of the system shall comply with the general rules for grounding 
contained in Article 250 of the National Electrical Code (NEC), National Fire 
Protection Agency (NFPA) 70, or the applicable code in your area. See 
Appendix G for more information.
Determine the a p proved ground in the building to be wired. See Ap pendix A. 
Connect your system to an a pproved ground as described below.
1. Ground  plate (three required)
2. 3 Conductor No.10 line cord (one per 
cabinet)
3. Plug (male)
4. J58890CG DC Distribution Unit
5. Rec eptacle (female)
6. Cabinet single-point ground block
7. 6 AWG wire
8. 25 Amp Fuse (4 required)
9. Coupled  bonding  conduc tor to terminal 
bar at cross-connect field10. Ground disc harge bar
11. 1 AWG wire
12. A p proved ground
13. To cabinet single-point ground block in next 
port cabinet
14. To DC distribution unit for next port network
15. 676B DC Power Sup ply
16. Port Cabinet
17. Control Cabinet
18. Battery Plant
Figure Notes: 
						

							Connect Power
Issue 1  September 1995 
4-9
Connect Power Plant Ground
To connect the power plant ground, complete the following steps:
1. At the DC power cabinet, connect a 1 AWG ground wire to the GROUND 
DIS CHA RGE b a r.
2. Route the g round wire out of the c a binet and terminate it on the approved 
ground (see Figure 4-5). The a pproved ground must be identified with a 
grounding tag (AT&T FORM 15657NR, or equivalent).
Figure 4-5. Power Plant Grounding
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1. 1 AWG wire
2. Approved ground. Must be connected 
to an approved ground using  the c orrect 
gauge cable, terminated  with a listed 
clamp , and identified with an AT&T 
ground tag or equivalent.3. DC Power Cabinet
4. Ground disc harge bar
Figure Notes: 
						

							Install and Connect the Cabinets
4-10Issue 1  September 1995 
Connect Frame Ground
Connect the 6 AWG frame ground cable to the cabinet frame by following these 
steps:
1. Measure and cut a length of 6 AWG cable. Use the provided cable or 
measure and  cut a length of 6 AWG cable long enough to reach between 
the GROUND CONNECTION terminal in the DC Battery Cabinet and the 
GROUND DISCHARGE bar in the DC Power Cabinet.
2. Crimp terminal lugs on each end of the wire. Terminal lugs are furnished 
as part of D-181895, Kit of Parts.
3. At DC power cabinet, connect wire to the GROUND DISCHARGE b ar.
4. Route the wire through one of the holes in the side of the c a binet and 
terminate it on the GROUND CONNECTION terminal in the DC Battery 
Cabinet (see Figure 4-6).
Figure 4-6. Frame Ground Grounding
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1. 6 AWG wire
2. Ground disc harge bar
3. DC battery cabinet4. Ground connection terminal
5. Power distribution unit
Figure Notes: 
						

							Connect Power
Issue 1  September 1995 
4-11
Connect DC Power Distribution Box Grounding
Run the 6 AWG ground cable from the DC Power Cabinet to each DC Power 
Distribution Unit, using the following steps:
1. At the DC Power Cabinet, connect 6 AWG wire to the GROUND 
DISCHARGE bar. Route the cable to the DC Power Distribution Unit. 
Connect the cable to the GRD Terminal Block in the DC Power 
Distribution Unit (see Figure 4-6).
2. Repeat Step 1 for each remaining DC Power Distribution Unit.
Figure 4-7. DC Power Distribution Unit Grounding (J58890CG)
Connect Single-Carrier Network Grounding
Each port cabinet must have a 6 AWG ground cable connected from the ground 
block of Control Cabinet A to the DC Power Cabinet.
Use the following instructions to connect each network ground:
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1. 6 AWG wire
2. To ad d itional J58890CG as provid e d
3. DC power cabinet4. Ground disc harge bar
5. Power distribution unit
6. Ground terminal strip
Figure Notes: 
						

							Install and Connect the Cabinets
4-12Issue 1  September 1995 
1. At the DC Power Cabinet, connect a 6 AWG cable to the GROUND 
DISCHARGE bar. Route the cable to the port Cabinet Carrier A. Connect 
the cable to the single-point ground block in the Control Carrier (see 
Figure 4-7).
2. Repeat Step 1 for each port Cabinet Carrier A in the system.
Figure 4-8. Ground Connection for Single-Carrier Network
Coupled Bonding Conductor (CBC) 
The coupled bonding conductor (CBC) connects the cabinet single-point 
ground block to the approved protective ground located nearest the (telephone 
company owned) protector b lock at the building entrance facility. Follow these 
steps to connect the coupled bonding conductor:
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1. 6 AWG wire
2. Ground plate
3. Cabinet stack single p oint ground  bloc k
4. To additional Port Cabinet as provided
5. DC Power Cabinet6. Ground disc harge bar
7. Port Cabinet D
8. Port Cabinet C
9. Port Cabinet B
10. Port Cabinet A
Figure Notes: 
						

							Connect Power
Issue 1  September 1995 
4-13
1. Connect a 10 AWG wire to the power cabinet ground discharge bar. See 
Figure 4-9).
2. Repeat for each port network c a binet. 
NOTE:
A Coupled Bonding Conductor (CBC) must be tie-wrapped to all 
trunk c a bles and terminated at the coupled bonding conductor 
terminal bar. 
Figure 4-9. Coupled Bonding Conductor
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1. 25-Pair tip and ring  cables to network 
cabinets.
2. Coupled bonding conductor terminal 
bloc k
3. Tie wraps
4. Cable shield or six sp are pairs
5. Ground on  carbon block protector or 
e quivalent
6. To external trunk interface
7. 10 AWG wire 8. Trunk cable
9. To network cabinets
10. Battery plant ground discharge bar for 
DC or AC system single point ground
11. Cross-connect ground block
12. Cross-connect field
13. To other cross-connect ground  blocks
14. A p proved Ground
15. Couple Bonding  Conductor
Figure Notes: