Preventing Electrostatic Discharge Damage; Laser/Led Safety - Cisco Catalyst 6500 Series Hardware Installation Manual

Chapter 4 Preparing to Install a SIP, SSC, or SPA

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. SIPs, SPAs, and processor modules
comprise printed circuit boards that are fixed in metal carriers. Electromagnetic interference (EMI)
shielding and connectors are integral components of the carrier. Although the metal carrier helps to
protect the board from ESD, use a preventive antistatic strap during handling.
Following are guidelines for preventing ESD damage:
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For safety, periodically check the resistance value of the antistatic strap. The measurement should be
Caution
between 1 and 10 megohms (Mohms).

Laser/LED Safety

An optical single-mode transmitter uses a small laser to transmit the light signal to the network ring.
Keep the transmit port covered whenever a cable is not connected to it. Although multimode transceivers
typically use LEDs for transmission, it is good practice to keep open ports covered and avoid staring into
open ports or apertures. The single-mode aperture port contains a laser warning label, as shown in
Figure
These warnings apply to SPAs and SFP modules that transmit signals via an optical carrier signal.
Figure 4-1
CLASS 1 LASER PRODUCT
OL-9041-04
Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.
Connect the equipment end of the strap to an unfinished chassis surface.
When installing a component, use any available ejector levers or captive installation screws to
properly seat the bus connectors in the backplane or midplane. These devices prevent accidental
removal, provide proper grounding for the system, and help to ensure that bus connectors are
properly seated.
When removing a component, use any available ejector levers or captive installation screws to
release the bus connectors from the backplane or midplane.
Handle carriers by available handles or edges only; avoid touching the printed circuit boards or
connectors.
Place a removed board component-side-up on an antistatic surface or in a static shielding container.
If you plan to return the component to the factory, immediately place it in a static shielding
container.
Avoid contact between the printed circuit boards and clothing. The wrist strap only protects
components 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 carrier.
4-1. The multimode aperture contains a Class 1 LED warning label, as shown in
Class 1 Laser Warning Labels for Single-Mode Port
LASERPRODUKT DER KLASSE 1
PRODUIT LASER DE CLASSE 1
1
PRODUCTO LASER CLASE 1
Catalyst 6500 Series Switch SIP, SSC, and SPA Hardware Installation Guide
Laser/LED Safety
Figure 4-1.
4-3