Caution: The concentrator should have two fans running at all times to cool the unit properly. You should therefore have: (A) a power supply (with built-in fan) and a fan unit installed or (B) two power supplies installed.

Power Requirements

3Com recommends using a 15 ampere electrical wire (branch circuit) to supply power to the concentrator. This circuit must be grounded to a safety ground (protected earth ground), not to neutral that carries current back to the transformer. Do not use the electrical conduit pipe as the only means of grounding.

Rack Mount Installation Requirements

For rack mount installation of the ONline System Concentrator you need a standard nineteen-inch EIA configured rack. The rack and its environment also should meet the following specifications:

If the rack has an open back and sides:

the rack must be bolted to the floor

the top of the rack may need to be braced to the wall

the rack must be grounded

there must be 10.5" (26.7 cm) (6U) of vertical space in the rack for each 17-slot concentrator

the unit location in the rack must be less than 6 feet (2 meters) from the nearest AC outlet

patch panels should already be installed in the rack for easier cable management

Installation and Troubleshooting 2 - 5

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3Com 5017C with load sharing, 5017C-LS Power Requirements, Rack Mount Installation Requirements