3com 8814 User Manual

C

HAPTER

 3: I

NSTALLATION

 P

REPARATION

To prevent the electronic components from being damaged by the electrostatic 
discharge (ESD), take ESD measures for the area where the switch is located and 
note the issues below:

■

Always wear an ESD-preventive wrist strap when installing the parts, especially 
the electric printed circuit boards.

■

Hold the circuit board by the edge. Do not touch the components or the 
electric printed circuit.

Take the following steps to use the ESD-preventive wrist strap.

Step 1: Wear the wrist strap on your wrist.

Step 2: Lock the wrist strap tight around your wrist to keep good contact with the 
skin.

Step 3: Insert it into the hole peculiar to ESD-preventive wrist strap in the chassis 
or attach it to the grounding screw of the chassis the alligator clips.

Step 4: Make sure that the ESD-preventive wrist strap is well grounded.

c 

Some I/O modules of the Switch 8800 Family have optical interfaces. In operating 
status, it is dangerous to stare into the open optical interface because the laser 
being transmitted through the optical fiber produces a small beam of light which 
has very high power density and is invisible to human eyes; when a beam of light 
enters the eye, retina may be burned.

c 

The Switch 8800 Family can only be used indoors. To ensure that the switch works 
normally and to prolong its service lifetime, the following requirements should be 
met in terms of installation environment.

To ensure the normal operation and service lifetime of a switch, proper 
temperature and humidity should be maintained in the equipment room. 
Long-lasting high humidity in the equipment room is prone to poor insulation or 
even leakage of the insulating material. Sometimes, the mechanical performance 
deterioration, the rustiness and corrosion of some metal parts are also more likely 
to occur. If the relative humidity is too low, the captive screws may become loose 
due to the insulation washer contraction. Meanwhile, the electrostatic is likely to 
be produced in the dry environment, which will jeopardize the CMOS circuit of the 
switch. The higher the temperature, the greater the damage it will do to the 
switch. Long-lasting high temperature will speed up the aging process of the 
insulating materials, greatly lower the reliability of the switch, and therefore affect 
its service life seriously.