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Installation and Troubleshooting 2 - 11
Installing the ONline System Concentrator
The ONline System Concentrator can be placed on top of a table or a shelf,
or mounted in a rack. Make sure the cable tray has been installed first on
the table or in the rack (or that 1 3/4" (4.5 cm) of vertical space has been
provided below the unit for air flow) and that the location meets all the
environmental considerations specified earlier in this chapter.
Caution: 3Com recommends that two people install the unit
since it weighs 38 lbs (17 kg) with one power supply
and 46 lbs (24 kg) with the backup power supply
installed.
3Com also recommends installing the backup power supply
prior to rack mounting the unit (see the section titled
Installing the Backup Power Supply later in this chapter). In
some rack cabinets, the rear of the cabinet may interfere
with installation or removal of the power supply and fan.
Rack Mounting the ONline System Concentrator
The ONline System Concentrator can be mounted in four different
configurations in the rack. Use the same rack settings for both the cable
tray and the concentrator. If you are not installing the cable tray in the
rack, you should select the concentrator mount setting at this time. Refer
to Table 2-2 and Figure 2-2 in the “Cable Tray Rack Mounting” section for
specifics about the four mounting settings.
Follow the steps below to mount the concentrator in your rack:
1. Attach the two rack mount flanges to the ONline concentrator unit in
the position you want as shown in Figure 2-4 using the eight (8)
provided 8-32 x 1/4" flathead screws - four per side.