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Installation and Troubleshooting 2 - 5
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