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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Chapter 3 Installing a Cisco MGX 8950
Installation Procedures
Connect DC Power to the Switch
Complete the following steps to connect DC power to the switch:
Note
Connect the Cisco MGX 8950 switch only to a –48 VDC source that complies with the Safety Extra Low
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.
Step 1
Verify that the power source to the switch is turned off and that the circuit breaker on the DC PEM is off.
Step 2
Use a Phillips-head screwdriver to remove the two screws that hold the plastic cover over the terminal
block on the DC PEM (see
for location).
Figure 3-32 DC-PEM
Step 3
Measure enough wire (6 AWG [10 square mm] or larger three-wire solid or stranded copper wire with
insulation rating for 140°F [60°C]) to connect the DC PEM terminal block to the power source.
Note
Cisco recommends using the Panduit LC AS6-10-L.
Step 4
Cut the ends of the wire so that the ends are straight, not slanted.
Step 5
Measure 1/4 inch (6 mm) up from one end of the wire and place a mark at that point.
Step 6
Use a wire stripper to remove 1/4 inch (6 mm) of the covering from the end of the wire. Trim the end of
the covering so that it is straight, not slanted.
Step 7
Attach a ring or space lug on the end of copper wire you prepared in
. The stripped part of the wire
must be fully inserted so that no bare wire is exposed.
Step 8
Attach the end of the wire with the ring or space lug to the 48 VDC return, as shown in
DC
J2 output
connector
-48V DC
-48V DC 50A
-48V
RTN
J2
J1
-48V DC 50A
-48V
RTN
43978
Circuit breaker
J1 output
connector
DC OK
LED
Plastic
cover
Terminal
block 2
Terminal
block 1
