Cisco Systems WS-X6608-T1 ユーザーズマニュアル
3-3
Cisco Cat alyst 4900M Sw itch Instal lation Guid e
78-18350-02
Chapter 3 Installi ng t he Switch
Rack-Mount ing the Switch
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The rack must have sufficient vertical clearance to ins ert the chassis. The chassis heig ht is 2 U
(3.5 inches (8.9 cm)).
(3.5 inches (8.9 cm)).
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The equ ipmen t rack is stab le and in no dan ger of falling over.
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Ensu re th at the sh elf is constructed to sup port the weight an d dimen sions of the ch assis. Fo r
physical sp ecificatio ns, see
physical sp ecificatio ns, see
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We recommend that you b olt th e rack to th e floor.
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Mount the unit at the b ottom of the rack if it is the o nly unit in the rack.
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Ins tall heavier equipment in the lower h alf o f the rack to maintain a low center of g ravity and
prevent th e rack from becoming top -heav y and tipp ing over.
prevent th e rack from becoming top -heav y and tipp ing over.
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Ins tall the stabilizers befo re moun tin g or servicing th e switch in the rack (if th e rack is prov ided
with stabilizin g devices).
with stabilizin g devices).
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The equ ipmen t rack is pro perly ventilated.
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Ins tall the chassis in an en closed rack only if it h as adeq uate ven tilation or an ex hau st fan ; use
an op en rack wh enever possible.
an op en rack wh enever possible.
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Ensu re th at the ambient temperature o f the rack env iron ment does not ex ceed a max imu m
temp eratu re o f 104
temp eratu re o f 104
°F (40°C). Note that if the switch is installed in a closed or multiunit rack
ass embly, the ambient operating temp eratu re of th e rack environment migh t be higher than th e
amb ient room temperature.
amb ient room temperature.
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Note that a ventilation system in a clo sed rack that is too p owerful mig ht also prevent co oling
by creating negative pressure around the chassis and redirecting the air away from th e chas sis
intake vent. If necessary, o perate the chassis with the rack op en .
by creating negative pressure around the chassis and redirecting the air away from th e chas sis
intake vent. If necessary, o perate the chassis with the rack op en .
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To prevent airflow restriction, allow at least 3 inch es (7.6 cm) of clearance aroun d th e
ven tilation op enin gs on the sid es of th e chass is .
ven tilation op enin gs on the sid es of th e chass is .
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Use baffles correctly to assist in cooling the chassis.
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Note that eq uipment near the bottom of a rack may g enerate ex cessive h eat that is drawn upward
an d in to the intake po rts of equip ment above, leadin g to ov ertemperature cond itio ns in the
ch assis at o r near the top of the rack.
an d in to the intake po rts of equip ment above, leadin g to ov ertemperature cond itio ns in the
ch assis at o r near the top of the rack.
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Consider the equip ment and cabling that is already in stalled in the rack. Ensure that cab les fro m
other eq uipment will not obstruct the airflow through the chassis o r impair access to the power
supplies or switching modu les. Rou te cables away from field-replaceable components to avoid
disconnectin g cables u nnecessarily for equipment main tenance or upgrad es.
other eq uipment will not obstruct the airflow through the chassis o r impair access to the power
supplies or switching modu les. Rou te cables away from field-replaceable components to avoid
disconnectin g cables u nnecessarily for equipment main tenance or upgrad es.
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Allow at least 3 to 4 feet (91 .4 to 121 .9 cm) of clearance behind the rack for mainten ance and
removal of switch assemblies. If the rack is mobile, y ou can push it back within 1 foo t (30.45
cm) of a wall or cabinet for no rmal operation an d p ull it ou t when n ecessary for maintenance.
removal of switch assemblies. If the rack is mobile, y ou can push it back within 1 foo t (30.45
cm) of a wall or cabinet for no rmal operation an d p ull it ou t when n ecessary for maintenance.
Lifting the Chassis Safely
The chassis is not intended to b e moved frequ ently. Befo re y ou install the switch, ensu re th at you r site
is p rop erly p repared so th at you can avoid mo ving the chassis later to acco mmodate power sou rces and
network con nections.
is p rop erly p repared so th at you can avoid mo ving the chassis later to acco mmodate power sou rces and
network con nections.
Wh enever you lift a chassis or any heavy ob ject, follow these gu idelin es:
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Ensu re th at your foo ting is s olid, and balan ce the weigh t of the chassis between you r feet.
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Lift the ch assis slowly; n ever move su ddenly or twist yo ur bo dy as you lift.