Cisco 30 VIP Especificaciones descargar pdf (Pagina 13)

VIP-FE-TX Installation and Configuration 13

Versatile Interface Processor Functions

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are

improperly handled, results in complete or intermittent failures. A processor module comprises a

printed circuit board that is ﬁxed in a metal carrier. Electromagnetic interference (EMI) shielding,

connectors, and a handle are integral components of the carrier. Although the metal carrier helps to

protect the board from ESD, use a preventive antistatic strap whenever handling a processor module.

Following are guidelines for preventing ESD damage:

• Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.

• Connect the equipment end of the strap to a captive installation screw on an installed power

supply.

• When installing a processor module, use the ejector levers to properly seat the bus connectors in

the backplane, then tighten both captive installation screws. (See Figure 9.) These screws prevent

accidental removal, provide proper grounding for the system, and help to ensure that the bus

connectors are seated in the backplane.

• When removing a processor module, use the ejector levers to release the bus connectors from the

backplane. Use the handle to pull the processor module out slowly while keeping your other hand

underneath the carrier to guide it straight out of the slot.

• Handle carriers by the handles and carrier edges only; avoid touching the board or connectors.

• Place a removed processor module board-side-up on an antistatic surface or in a static shielding

bag. If you plan to return the component to the factory, immediately place it in a static shielding

bag.

• Avoid contact between the processor module and clothing. The wrist strap only protects the board

from ESD voltages on the body; ESD voltages on clothing can still cause damage.

• Never attempt to remove the printed circuit board from the metal interface processor carrier.

Caution For safety, periodically check the resistance value of the antistatic strap. The

measurement should be between 1 and 10 megohms.

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Cisco 30 VIP Especificaciones Pagina 13