Unpacking the Chassis, Preparing the Work Area

Unpacking the Chassis

Following are guidelines for preventing ESD damage:

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

•When removing or installing an LED board, connect the equipment end of the ground strap to an unpainted surface of the chassis, such as the vertical metal frame that is exposed when the front chassis panels are removed.

•Handle boards by the edges only; avoid touching the board components, traces, or connector pins.

•Place a removed board component-side-up on an antistatic surface or in a static shielding bag. If you are returning the board to the factory, immediately place it in a static shielding bag to avoid ESD damage.

•Avoid contact between the board and clothing. The wrist strap only protects the board from ESD voltages on the body; ESD voltages on clothing can still cause damage.

Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be within the range of 1 and 10 megohms.

Preparing the Work Area

Although some network downtime is unavoidable while you remove the RP and SP and replace them in the new chassis, you can minimize network downtime by placing the old and new chassis close together. If your existing chassis is mounted in a rack, and there is space in the same rack or another rack close by, install the new chassis in the rack before shutting down the existing chassis. Leave network interface cables connected to the interface ports only if the following conditions are true:

•You are able to place the new chassis next to the existing chassis, and moving the processor modules to the new chassis will not strain the interface cables.

•You will not have to lift the new chassis after the processor modules and power supplies are installed.

•The new chassis is already located in its permanent location, or you will need to move it only a few feet into the space vacated by the old chassis when it is removed.

•Before removing an existing chassis that is rack mounted, you are able to install the new chassis in the same rack or an adjacent rack, and moving the processor modules to the new chassis will not strain the interface cables.

If these conditions are not true, for instance, if you must remove a rack-mounted chassis before you can install the new chassis, you must disconnect all power and network interface cables.