3com 3CR17451-91 User Manual
Rack-mounting
21
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power lines and fluorescent lighting fixtures.
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The Switch is accessible and cables can be connected easily.
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Water or moisture cannot enter the case of the Switch.
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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.
side of the Switch. 3Com recommends that you provide a minimum of
25 mm (1 in.) clearance.
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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.
temperature may be greater than room ambient temperature.
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The air is as free from dust as possible.
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The Switch is situated away from sources of conductive (electrical)
dust, for example laser printers.
dust, for example laser printers.
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The unit is installed in a clean, air conditioned environment.
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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.
that generate high levels of AC noise, for example air conditioning
units.
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No more than four Switch units are placed on top of one another, if
the units are free-standing.
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.
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.
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.
DUA1745-0AAA03.book Page 21 Friday, April 8, 2005 12:34 PM