Maintain the SCB

The System Control Board (SCB) occupies the center slot of the card cage, installing into the backplane from the front of the chassis (see Figure 1). To maintain the SCB, follow these guidelines:

• Check the LEDs on the SCB faceplate. The green LEDs labeled ACTIVE and RUN blink periodically when it is functioning normally. For more information, see SCB Components.
• Issue the CLI show chassis scb command to check the status of the SCB. As shown in the sample output, the Uptime field reports how long the SCB has been functioning:

user@host> show chassis scb

    SCB status:

      Temperature                 26 degrees C / 78 degrees F

      CPU utilization              2 percent

      Interrupt utilization        0 percent

      Heap utilization            16 percent

      Buffer utilization          44 percent

      Total CPU DRAM              64 MB

      Internet Processor II          Version 1, Foundry IBM, Part number 9

      Start time:                    2003-05-22 11:43:46 PDT

      Uptime:                        4 days, 4 hours, 11 minutes, 15 seconds

For further description of the output from the command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.