Cisco Systems WS-X6608-T1 用户手册
2-9
Cisco Cat alyst 4900M Sw itch Instal lation Guid e
78-18350-02
Chapter 2 Si te Planning
Sit e Plannin g Checkli st
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damag e occu rs when electro nic cards or compon en ts are impro perly
handled and can result in complete o r intermittent failu res. Follow these g uidelines to prevent ESD
damage:
handled and can result in complete o r intermittent failu res. Follow these g uidelines to prevent ESD
damage:
•
Always use an ESD-preventive wrist or ank le strap, an d ensure th at it makes maximum con tact with
the sk in.
the sk in.
•
Wh en co ming in to contact with any intern al co mponents, always u se a wrist strap connected to on e
of the following:
of the following:
–
ESD wrist strap co nnector
–
Any un pain ted ground ed surface on the chassis or equip ment rack
Caution
Periodically check the resistance value of the antistatic strap. The measu remen t should be between 1 and
10 meg ohms (Moh ms).
10 meg ohms (Moh ms).
•
Handle card s by the ed ges on ly.
•
Avo id con tact b etween the mo dules and clothing. The wrist strap p rotects o nly the card from ESD
voltages on the body ; ESD vo ltages on clothing can still cause damage.
voltages on the body ; ESD vo ltages on clothing can still cause damage.
Site Planning Checklist
lis ts the site plan ning activ ities th at y ou sho uld perform befo re you install the Catalyst 4900M
switch. Co mp leting each activity helps to en sure a success ful switch installatio n.
Table 2-2
Site Planning Checklist
Task No.
Pla nning Activity
Verified By
Time
Date
1
Space evalu ation :
Space and layout
Floor covering
Shock and v ib ration
Ligh ting
Mainten ance access
2
Environmental evaluation:
Ambient temperature
Hu mid ity
Altitud e
Atmos pheric contamination
Airflow
3
Power evaluation:
In put power typ e
Receptacle p rox imity to the eq uipment
Dedicated (s eparate) circuits for redund ant power
supp lies
supp lies
UPS for p ower failures