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Installation Manual
H3C LS8M1WCMA0-OVS Access Controller Module
Step 3: Insert the grounding terminal of the ESD-preventive wrist strap to the
corresponding 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.
Caution:
For safety concern, check the resistance of the ESD-preventive wrist strap. The
resistance between the human body and the ground should be 1 to 10 M ohm.
2.2 Installation Site Checking
Install the card in a switch in an environment that meets the requirements described in
the following subsections:
2.2.1 Requirements on Temperature/Humidity
You must maintain a proper temperature and humidity in the equipment room. A
long-term high humidity may lead to bad insulation, electricity leakage, mechanical
property changes, and corrosion. However, if the relative humidity is two low, captive
screws may become loose as the result of contraction of insulation washers and static
electricity may be produced in a dry environment to jeopardize the circuits on the device.
High temperature is the most undesirable condition, because it accelerates aging of
insulation materials and can thus significantly lower reliability and service life of your
switch.
2.2.2 Requirements on Cleanness
Dust is a hazard to the operating safety of your card. The dust accumulated on the
chassis can be adsorbed by static electricity and result in poor contact of metal
connectors or metal contact points. Especially, when the relative indoor humidity is low,
electrostatic adsorption is more likely to happen. This can not only shorten the service
life of the card but also cause communications failures.
The following table lists the dust concentration limit.
Chapter 2 Installation Preparation
2-2
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