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Product Numbers: GSR8-CSC(=) and GSR8-SFC(=)
This document provides replacement procedures for the clock and scheduler card (CSC) and the switch fabric card (SFC), which are the two types of switch cards used in the Cisco 12008 Gigabit Switch Router (GSR). The document contains the following sections:
Use this document in conjunction with the Cisco 12008 Gigabit Switch Router Installation and Configuration Guide (document number 78-4953-xx), which shipped with your Cisco 12008 Gigabit switch router.
Before replacing any switch cards in the upper or lower card cage of the Cisco 12008, review the following safety guidelines to prevent injury to yourself or damage to the equipment. This section also lists the tools that you will need to perform the switch card replacement procedures.
Observe the following guidelines to ensure your safety and protect the equipment. This list does not identify all of the potentially hazardous situations that you may encounter in the workplace, so be alert and exercise care when working with any of the switch router's electrical or electronic components.
Observe the following basic safety guidelines when working with the switch router's electrical and electronic equipment:
In addition, observe the following guidelines when you are working with equipment connected to telephone wiring or other network cabling.
 | Warning Do not work on the system or connect or disconnect cables during lightning storms. |
Electrostatic discharge (ESD) damage to circuit boards can occur if they are handled improperly. Such mishandling can result in intermittent or complete failures of the board.
When handling circuit boards, observe the following guidelines to prevent ESD damage:
 | Caution For safety, periodically check the resistance value of the antistatic wrist strap. The resistance measurement should be between 1 and 10 megohms. |
You need the following tools and parts if you want to install or replace a switch card:
This section describes the procedures for removing, installing, and verifying the installation of the Clock and schedular card (CSC) and the Switch fabric card (SFC) for the Cisco 12008.
The Cisco 12008 supports online insertion and removal of electronic components; thus, you can remove and replace a CSC or an SFC without powering down the system.
When you install a new CSC or SFC, the switch router's online insertion and removal (OIR) capability enables the new card to be recognized, initialized, and made fully operational in a transparent manner.
In the following procedures, it is assumed that you intend to remove and replace a switch card from a fully redundant and operational Cisco 12008.
While you are replacing the failed card, only four switch planes remain available to the switch router. For the duration of the replacement procedure, no redundant switch plane exists to take over if any other switch plane should fail.
In a fully configured system, there is no conventional operating scenario under which you would leave either a CSC or an SFC slot vacant for any substantial length of time, beyond the time it takes to replace a failed card.
Two dedicated slots (CSC 0 and CSC 1) in the middle of the upper card cage are reserved for the exclusive use of the clock and scheduler card (CSC). The standard router configuration calls for one CSC to be installed in either one of two dedicated slots in the upper card cage; for redundancy, you can install a second (optional) CSC in the adjacent slot to provide redundancy of function in the event of failure of either card. There are three dedicated slots (SFC 0, SFC 1, and SFC 2) in the lower card cage for the three SFCs.
To remove an SFC from the Cisco 12008, perform the following steps.
Step 1 Loosen the two panel fastener screws on each side of the air filter assembly (see Figure 1); remove the assembly and set it aside.
Step 2 Grasp the front of the card carrier's metal faceplate, unseat the card from the backplane, and slide the SFC out of the slot; supporting the weight of the card by placing your other hand underneath the card carrier. Store the SFC in an antistatic bag or in an antistatic card rack.
Step 3 If you intend to return the card for repair or replacement, leave the card in its antistatic bag and prepare a return package for shipment.
| Caution Do not place any tools in the lower card cage. Also, be careful not to damage the honeycomb screen in the air filter assembly. Damaging this screen can restrict the flow of cooling air through the switch router, causing an overtemperature condition. |
To install an SFC in the Cisco 12008, perform the following steps:
Step 1 With one hand, grasp the new SFC by its card carrier's faceplate; support the weight of the card by placing your other hand underneath the card carrier.
Step 2 Position the card carrier horizontally and insert it into the vacant slot, sliding it under the guide rails (see Figure 2), until the tabs on the bottom of the card carrier clear the line on the chassis and the SFC is firmly seated in the backplane (see Figure 2).
Step 3 Restore the air filter assembly to the switch router to fully enclose the lower card cage. Secure the assembly in place by tightening its two panel fastener screws.
This completes the procedure for removing and installing an SFC. Upon completion of this procedure, you can verify the operability of the new SFC by performing the procedure in the section "Checking the Installation of Switch Cards".
To remove a CSC from the Cisco 12008, perform the following steps.
Step 1 Loosen the two captive installation screws beneath the card ejector levers at the top and bottom of the card (see Figure 3).
Step 2 Grasp the ejector levers and pivot them upwards, away from the card faceplate, to unseat the card from the backplane (see Figure 3).
Step 3 Touching only the ejector levers or the metal card carrier proper, slide the card out of the slot and store it in an antistatic bag or in an antistatic card rack (see Figure 3).
Step 4 If you intend to return the card for repair or replacement, leave the card in its antistatic bag and prepare a return package for shipment.
Step 5 Insert the replacement CSC or a blank filler panel (refer to the section "Installing a CSC" or "Installing/Removing a Blank Filler Panel").
To install a CSC in the Cisco 12008, perform the following steps:
Step 1 With one hand, grasp the new CSC by its faceplate; support the weight of the card by placing your other hand underneath the card carrier.
Step 2 Position the card vertically and insert it into the vacant slot in the upper card cage until the card's ejector levers meet the retention lips at the top and bottom of the enclosure (see Figure 4).
Step 3 Pivot the ejector levers toward the card faceplate to engage the retention lips at the top and bottom of the enclosure and firmly seat the card in the backplane (see Figure 4).
This completes the procedure for removing and installing a CSC. Upon completion of this procedure, you can verify the operability of the new CSC by performing the procedure in the section "Checking the Installation of Switch Cards".
To verify the proper operation of a newly-installed switch card, perform the following steps:
Step 1 Observe the LEDs on the faceplate of the CSC(s), as follows:
| Status LEDs | State | Description |
|---|---|---|
Top LED | On (amber) | Indicates that CSC is faulty |
Bottom LED | On (green) | Indicates that CSC is operational |
Step 2 The secondary indication of SFC status is provided by the two LEDs on each SFC (see Figure 6). Observe each pair of LEDs on each SFC for the following indications:
| Status LEDs | State | Description |
|---|---|---|
Top LED | On (amber) | Indicates that a fault has been detected in one or more of the SFCs |
Bottom LED | On (green) | Indicates that SFCs are installed and operating normally |
Both LEDs | Off | Indicates that no SFCs are installed |
Step 3 If the new switch fabric is faulty, perform the following steps, as appropriate:
In Step 2 above, since the SFCs are not visible during normal operation, you must remove the air filter assembly from the switch router to observe the status LEDs on each SFC. These LEDs are arranged side-by-side (as you view the SFCs from the front of the switch router).
Alternatively, you could issue the following command in EXEC mode to show the status of all the switch router's LEDs:
router# show environment leds
If the CSC indicates a fault with an SFC, you must still remove the air filter assembly from the switch router and observe the status LEDs on the SFCs proper to determine which of them was actually at fault.
The Cisco 12008 must be fully enclosed to ensure that cooling air is distributed properly throughout the system. Fully enclosing the router prevents overheating of electronic components and suppresses EMI radiation from the system.
To cover any vacant slot in the upper card cage, you must install a blank filler panel (see Figure 7).
To install a blank filler panel in the upper card cage, perform the following steps:
Step 1 Grasp the filler panel and position it vertically and insert it into the vacant slot.
Step 2 Tighten down the two captive installation screws at the top and bottom of the filler panel, securing it firmly in place.
If it becomes necessary to remove a blank filler panel to accommodate the insertion of a new card in the upper card cage, perform the converse of the steps outlined above.
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Posted: Tue Mar 9 11:27:43 PST 1999
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