Upgrading Boot ROMs in the Cisco HyperSwitch A100

Safety Recommendations

Follow these guidelines to ensure general safety:

• Keep the chassis area clear and dust-free during and after installation.
  

• Put the removed chassis cover in a safe place.
  

• Keep tools away from walk areas where you or others could trip over them.
  

• Do not wear loose clothing that could get caught in the chassis. Fasten your tie or scarf and roll up your sleeves.
  

• Wear safety glasses when working under any conditions that might be hazardous to your eyes.
  

• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
  

Safety with Electricity

Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or can weld to the terminals.

Follow these guidelines when working on equipment powered by electricity:

• Locate the emergency power-off switch in the room in which you are working. Then, if an electrical accident occurs, you can quickly shut the power OFF.
  

• Before working on the system, turn OFF the power and unplug the power cord.
  

• Disconnect all power before doing the following:
  

  • Installing or removing a router chassis
    

  • Working near power supplies
    

  • Performing a software upgrade
    

• Do not work alone if potentially hazardous conditions exist.
  

• Never assume that power is disconnected from a circuit. Always check.
  

• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power extension cables, and missing safety grounds.
  

• If an electrical accident occurs, proceed as follows:
  

  • Use caution; do not become a victim yourself.
    

  • Turn OFF power to the system.
    

  • If possible, send another person to get medical aid. Otherwise, determine the condition of the victim and then call for help.
    

  • Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate action.
    

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when electronic printed circuit cards are improperly handled and can result in complete or intermittent failures. Always follow ESD prevention procedures when removing and replacing cards. Ensure that the router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the clip to an unpainted chassis frame surface to safely channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the metal part of the chassis.

Caution For safety, periodically check the resistance value of the antistatic strap, which should be within the range of 1 through 10 megohm.

ROM Upgrade Procedure

Perform the following procedure to replace the ROM integrated circuit chips:

Step 1 Provide protection against static electricity. Work on an antistatic mat, if possible, and always use an ESD preventive wrist strap attached to a metal grounding point on the chassis.

Step 2 Turn OFF the console terminal power switch, and disconnect the EIA/TIA-232 cable connected to the console terminal from the HyperSwitch A100 front panel.

Step 3 Set the power switch on the back of the HyperSwitch A100 main unit to the OFF position. Unplug the power cable from the power outlet and then from the HyperSwitch A100.

Step 4 Using the Phillips screwdriver, remove the six screws from the PROC card panel. Grasp the card ejectors on the PROC card panel and pull the card outward.

Step 5 Using the ROM extraction tool, remove the four ROM IC chips. (See Figure 1.)

Step 6 Insert new ROM IC chips on the PROC card securely. Each ROM IC chip is labeled according to the version and mounting position on the package.