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
8
13
9
5
10
6
11
7
77
712
12
11
3
4
2
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...

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...

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...

Connect Power
Issue 1  September 1995 
4-7
GRD
-48V
-48V RTN
1
GRD
-48V
-48V RTN
1
GRD
-48V
-48V RTN
1
GRD
-48V
-48V RTN
1
-48V
RTN
-48V
GRD
1
1
1
1
1
1
1
1
3
8
13
18
4
9
14
5
5
10
15
15
15
15
1
1
1
6
11
11
16
16
16
2
2
2
2
7
7
7
12
17
(-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 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
1
2
34
1. 1 AWG wire
2. Approved ground. Must...

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...

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...

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...

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
3
3
3
8
13
4
9
14
14
5
10
15
1
6
11
2
7
1212
1. 25-Pair tip and ring  cables to network 
cabinets.
2. Coupled bonding conductor terminal 
bloc k
3....