Connecting Source Power to the Power Supplies
Connecting Source Power to a DC-Input Power Supply
In the following procedure, you are assumed to have a DC-input power supply already installed in your router; you need to connect it to a DC power source. If a DC-input power supply is not already installed, perform the procedures in the earlier section entitled “Reinstalling the Power Supplies in the Router” before attempting to connect source DC power to the unit.
If you equip your router with a single DC-input power supply, install it in the bottom power supply bay.
Note An unoccupied power supply bay must have a power supply blank installed to ensure EMI compliance and the proper flow of cooling air through the router.
Before attempting to connect your DC-input power supply to a DC power source, ensure that your site meets the following requirements:
•DC power service—A dedicated 40A service must be available for each DC-input power supply.
•Power cables (three per power supply)—The power cables must have the following characteristics:
—Size—4 AWG (recommended)
—Diameter—0.204-inch (5.18-mm)
—Construction—High-strand-count copper wire
The length of the power cable depends on the location of your router within the site and the proximity of source DC power to the router.
•Power lugs (one for each of the three power cables)—The lugs for the power cables must have the following characteristics:
—Contain dual holes centered 0.625-inch apart
—Be able to fit over M6 (metric) threaded terminal studs on the router faceplate
—Be made of copper (not aluminum) with electro-tin plating for corrosion resistance; equivalent power lugs are acceptable
3-46Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
