3Com 3CR17451-91 Rack-mounting, Power lines and fluorescent lighting fixtures, Facing towards you

Rack-mounting 21

■ power lines and fluorescent lighting fixtures.

■ The Switch is accessible and cables can be connected easily. ■ Water or moisture cannot enter the case of the Switch.

■ Air flow is not restricted around the Switch or through the vents in the side of the Switch. 3Com recommends that you provide a minimum of 25 mm (1 in.) clearance.

■ Air temperature around the Switch does not exceed 40 °C (104 °F).

If the Switch is installed in a 19-inch rack or closed assembly its local air temperature may be greater than room ambient temperature.

■ The air is as free from dust as possible.

■ The Switch is situated away from sources of conductive (electrical) dust, for example laser printers.

	■ The unit is installed in a clean, air conditioned environment.
	■ The AC supply used by the Switch is separate to that used by units
	that generate high levels of AC noise, for example air conditioning
	units.
	■ No more than four Switch units are placed on top of one another, if
	the units are free-standing.
Rack-mounting	The Switch 3870 is 1U high and will fit in most standard 19-inch racks.
	CAUTION: Disconnect all cables from the Switch before continuing.
	Remove all self adhesive pads from the underside of the Switch if they
	have been fitted.
	CAUTION: If you use a shelf or support ensure that it will not obstruct
	the air flow through the side panels of the Switch.
	To rack-mount your Switch:
	1 Place the Switch the right way up on a hard flat surface, with the front
	facing towards you.
	2 Locate a securing bracket over the mounting holes on one side of the
	Switch, as shown in Figure 4.
	3 Insert the four screws and tighten with a suitable screwdriver.