Cisco MGX 8950 Installation Manual page 49

Chapter 3 Installing a Cisco MGX 8950
Connect DC Power to the Switch
Complete the following steps to connect DC power to the switch:
Connect the Cisco MGX 8950 switch only to a –48 VDC source that complies with the Safety Extra Low
Note
Voltage (SELV) requirements in IEC 60950/EN 60950.
If you are installing redundant DC PEMs, you can connect to the same power source if you do not require
the additional fault tolerance offered when using separate power sources.
Verify that the power source to the switch is turned off and that the circuit breaker on the DC PEM is off.
Step 1
Use a Phillips-head screwdriver to remove the two screws that hold the plastic cover over the terminal
Step 2
block on the DC PEM (see
Figure 3-32 DC-PEM
Plastic
cover
Measure enough wire (6 AWG [10 square mm] or larger three-wire solid or stranded copper wire with
Step 3
insulation rating for 140°F [60°C]) to connect the DC PEM terminal block to the power source.
Note
Cut the ends of the wire so that the ends are straight, not slanted.
Step 4
Measure 1/4 inch (6 mm) up from one end of the wire and place a mark at that point.
Step 5
Use a wire stripper to remove 1/4 inch (6 mm) of the covering from the end of the wire. Trim the end of
Step 6
the covering so that it is straight, not slanted.
Attach a ring or space lug on the end of copper wire you prepared in
Step 7
must be fully inserted so that no bare wire is exposed.
Attach the end of the wire with the ring or space lug to the 48 VDC return, as shown in
Step 8
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Figure 3-32
-4 8V D C
R TN
-4 8V
-4 8V D C
50 A
J1
Terminal
J1 output
block 1
connector
Cisco recommends using the Panduit LC AS6-10-L.
for location).
J2
Circuit breaker
J2 output
connector
Cisco MGX 8950 Hardware Installation Guide
Installation Procedures
R TN
-4 8V
-4 8V D C
50 A
D C
DC OK
Terminal
LED
block 2
Step 6. The stripped part of the wire
Figure 3-33.
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