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Chapter 3
Installing the Cisco RF Switch
Connecting DC Power to the Power Supply
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003.
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement
Warning
1022.
This product requires short-circuit (overcurrent) protection, to be provided as part of the building
Warning
installation. Install only in accordance with national and local wiring regulations. Statement 1045.
The color coding of the DC-input power supply leads depends on the color coding of the DC power
Note
source at your site. Typically, green or green-yellow is used for ground, black is used for +48V (return),
and red or white is used for –48V. Ensure that the lead color coding you choose for the DC-input power
supply matches lead color coding used at the DC power source.
Each DC-input power supply has an electrical current rating of 0.7 A, 20 VA. Use a minimum of
Caution
14 AWG (2.5 mm
by a 15 A circuit breaker or fuse that is in compliance with your local electric regulations.
Equipment
•
•
•
•
Step 1
Ensure that the –48V and +48V leads are disconnected from the power source.
Step 2
Check that the power switch on the power supply is in the OFF (0) position.
Ensure that the unit is properly grounded. See the
Step 3
on page
Step 4
Using a wire stripper, strip approximately 0.25 in. (7 mm) from the –48V and +48V leads.
Insert the stripped end of the +48V lead all the way into the +48V lead receptacle and tighten the
Step 5
receptacle screw using the same 3/16-inch flat-blade screwdriver.
Step 6
Repeat
If any exposed wire at the stripped end of a lead is visible after inserting the lead into its receptacle,
Caution
remove the lead from the receptacle, use the wire stripper to cut the stripped end of the lead, and repeat
Step 4
OL-1984-06
2
) wire for the input to each DC-input power supply. The power input must be protected
2
14 AWG (2.5 mm
) wire
Wire stripper
AC to DC power source
7/16-inch flat-blade screwdriver
3-14.
Step 4
and
Step 5
for the –48V lead.
and
Step
5, if necessary.
"Grounding the Cisco uBR 3x10 RF Switch" section
Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
Connecting Power
3-17
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