Cisco Systems Cisco CRS-1 manual Pcmcia Cards, Small Form-Factor Pluggable SFP Modules, Guidelines

Chapter 4 Installing and Removing SFCs, RPs, MSCs, PLIMs, and Associated Components

About Installing and Removing Cards and Associated Components

Guidelines

When you install or remove cards on the Cisco CRS-1 4-slot line card chassis, follow these guidelines:

•Do not operate the Cisco CRS-1 4-slot line card chassis with any slots completely empty; doing so can lead to an airflow bypass condition that diverts airflow from slots containing heat-generating electronics. This situation can cause thermal alarms to occur at lower-than-expected ambient temperatures. To avoid airflow bypass, make sure that all slots are filled with their appropriate cards or impedance carriers. If you have to replace a card, we recommend leaving the card in place in the chassis until you are ready to install the new one.

•When you remove a card, always use the ejector levers to ensure that the connector pins disconnect from the midplane in the sequence expected by the router.

•To lessen the possibility of damaging the connectors on the chassis midplane, you should visually inspect the connector pins on the cards before you insert them into the chassis.

PCMCIA Cards

Optional and replaceable PCMCIA cards are available for the RP cards. The RP cards provide two PCMCIA flash slots, each card providing up to 1 GB of flash storage. One of the PCMCIA flash subsystems is accessible externally, is removable, and allows you to transfer system images and configurations by plugging in a PCMCIA flash card. The other subsystem is fixed to the RP, is not removable, and is used for permanent storage of configurations and system images.

Small Form-Factor Pluggable (SFP) Modules

The SFP module for the Cisco CRS-1 4-slot line card chassis uses the bale-clasp latch type.

Caution Protect the SFP modules by inserting clean dust covers into them after the cables are removed from them. Be sure to clean the optic surfaces of the fiber cables before you plug them back into the optical ports of another SFP module. Avoid getting dust and other contaminants into the optical ports of the SFP modules: The optics do not work correctly when obstructed with dust.

Note Shared port adapters (SPAs) and the 16-port OC-48c/STM-16c PLIM use SFP modules.

Cable Management Brackets

The Cisco CRS-1 4-slot line card chassis includes a cable management system that organizes the interface cables entering and exiting the different cards, keeping them out of the way and free of sharp bends.

Caution Excessive bending of interface cables can damage the cables.

The Cisco CRS-1 4-slot line card chassis arrives preinstalled with a horizontal cable management bracket on the front of the chassis; this bracket cannot be removed or replaced.

Cisco CRS-1 Carrier Routing System 4-Slot Line Card Chassis Installation Guide

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