3Com Router 6000 Family
Installation Manual
Chapter 2
Preparing for Installation
3Com Corporation
2-3

2.1.5 Lightning Protection

By design, the router is lightning protective; but excessive lightning may still damage the
device. To protect the device better, you are recommended to:
z Ensure the PGND of the chassis is securely connected to the earth ground.
z Ensure the earth point of the power socket is securely connected to the earth
ground.
z Add a lightning arrester onto the front end of the power input to better protect the
power supply from lightning strikes.
z For signal cables such as ISDN cables, telephone cables, E1/T1 cables, install a
special lightning arrester at their input end for better protection.

2.1.6 Checking the Rack

When installing the router, observe the following:
z Reserve adequate clearance at the air intake exhausting vents for adequate
ventilation inside the chassis.
z Make sure that the rack has a good ventilation system.
z Make sure that the rack is sturdy enough to support the weight of the device and
the installation accessories.
z Make sure that the rack is well-grounded.

2.2 Safety Precautions

When reading this manual, pay adequate attention to the following.
Warning appears in operation procedures that, if performed incorrectly, might cause
bodily injury to the operators or damage the device.
Caution appears throughout this manual in procedures that, if performed incorrectly,
might affect the operation of the router.
When installing or working on the router, you are recommended to:
z Keep the router far away from the heat sources and water/liquid.
z Make sure that the router has been correctly grounded.
z Wear an ESD-preventive wrist strap in installation and maintenance, making
sure that the strap has good skin contact.
z Do not hot swap the main control board of the router.
z Correctly connect the ports. Above all, do not insert a telephone cable (or ISDN
cable) into a serial port.
z Use laser cautions. Do not directly stare into apertures or fiber-optic connectors
that emit laser radiation.