10-2
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 10 Installing the DC Shelf
DC Power Input Connections
Step 4
Run three wires from the DC terminal block to a source of 48 VDC.
Use 8 AWG wire (or metric equivalent for E1 systems).
Use a #10 screw ring lug designed for 8 AWG wire (90
°
lug if using conduit box) to terminate the wires.
Caution
Ensure that the polarity of the DC input wiring is correct! Connections with reversed
polarity may damage the equipment.
Warning
Remember that this is a positive ground system.
Connect the positive lead to the +RTN terminal.
Connect the negative lead to the –48V terminal.
Connect the earth ground to the middle terminal labeled SAFETY GROUND.
(See Figure 10-1, Figure 10-2 and Figure 10-3.)
For personnel safety, the green/yellow wire must be connected to safety (earth) ground
at both the equipment and at the supply side of the DC wiring.
Figure 10-1 DC Power
Step 5
Terminate the DC input wiring to a DC source capable of supplying at least 50 amperes. A 50A DC
circuit breaker is required at the 48 VDC facility power source. An easily accessible disconnect device
should be incorporated into the facility wiring. Be sure to connect the ground wire/conduit to a solid
office (earth) ground.
Note
Primary overcurrent protection is provided by the building circuit breaker. In
North America, this breaker should protect against excess currents, short circuits,
and earth faults in accordance with NEC ANSI NFPA 70/CEC.
Step 6
If the system is equipped with dual power feed, repeat steps 1 through 6 for the second power feed.
Step 7
Either replace the cover on the conduit terminating box(es) or attach the plastic cover plate(s) to the
terminal block with screws into the two terminal block standoffs. (See Figure 10-2 and Figure 10-3.)
Battery
power
-48V
-48V
RTN
RTN
PEM
DC-DC
converter
Circuit card
Safety
ground
Legend
Earth ground
DC ground
PEM - Power Entry Module
RTN - Return
Backplane
-48V
RTN
Conductive edge
S6392
Содержание BPX 8600 Series
Страница 43: ...P A R T 1 The BPX Switch ...
Страница 44: ......
Страница 151: ...P A R T 2 Installation ...
Страница 152: ......
Страница 261: ...P A R T 3 Initial Configuration and Network Management ...
Страница 262: ......
Страница 291: ...P A R T 4 Configuring Connections ...
Страница 292: ......
Страница 481: ...P A R T 5 Troubleshooting and Maintenance ...
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Страница 531: ...P A R T 6 BPX Specifications ...
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Страница 563: ...P A R T 7 Appendices ...
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Страница 624: ...Glossary 24 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...
Страница 630: ...Index 6 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...