3com S7906E Guide D’Installation Rapide

 

2-2 

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

z

 

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

z

 

Take the edge of the circuit board. 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 ESD-preventive wrist strap. 

Step 2: Strain and tighten the strap, and ensure that it makes good contact with your skin. 

Step 3: Insert the grounding terminal of the ESD-preventive wrist strap into the jack on the switch 
chassis or attach it to the grounding screw of the chassis with an alligator clip. 

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

 

An ESD-preventive wrist strap is shipped with the S7900E series. 
There is a jack for the ESD-preventive wrist strap on the chassis of the S7900E series. 

 

For safety case, check the resistance of the ESD-preventive wrist strap. The resistance between 
human body and the ground should be 1 to 10M ohm. 

 

Some LPUs of the S7900E series have optical interfaces. In operating status, it is prohibited to stare 
into the open optical interface because the laser being transmitted through the optical fiber will 
produces a small beam of light, it has very high power density and is invisible to human eyes, when a 
beam of light enters the eye, retina may be burned. 

 

Staring at the laser beam inside the fiber could hurt your eyes. 

 

The S7900E series can only be used indoors. To ensure that the switch works normally and expand its 
service life, the installation environment shall meet the requirements below.