| Installation Checklist 39 |
Table 47 Temperature and Humidity Requirements | |
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Temperature | Relative humidity (noncondensing) |
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00 to 400C (320 to 1040F) | 10% to 90% |
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Static Electricity
To prevent damage caused by the static electricity, ensure that:
■The equipment is grounded
■The equipment room is
■Adequate temperature and humidity conditions are maintained.
■The operator wears an antistatic wrist strap while handling the module.
■The module is placed upward on the antistatic workbench, or put into an antistatic bag.
■Avoid direct contact with the elements of the circuit board.
Electromagnetic Discharge
To prevent damage by electromagnetic discharge, do the following:
■Take effective measures against electrical interference for the power supply system.
■Separate the working ground of the switch from the grounding device of the power equipment, or lightning conductor.
■Adopt electromagnetic shielding if necessary.
Lightning Damage
To minimize the risk of lightning damage do the following:
■Install a lightning arrester on the input end of a telephone cable, or other external line.
■Ensure that the PGND wire of the chassis is well grounded
■Ensure that the neutral point of the socket of AC power supply is well grounded
■Install a lightning arrester at the input end of the power supply
Installation Space The Switch 7750 is a complex piece of equipment so it is necessary to make arrangements for the installation position, power supply, and cabling.
For better heat dissipation and equipment maintenance, 3Com recommends that you keep the front and back of the switch more than 1 meter (3 feet) away from the walls or other devices. The sides of the switch should be at least 0.8 meters (2.5 ft) away from the walls. If the optional cabinet is installed, the clear height of room should be more than 3 meters (10 ft).
Installation Checklist When you open the packing case of the switch, check the contents against the your order contract. Contact your Service representative if you find any discrepancies.
To install the Switch 7750, you will need:
