Step 3: Check the SCB LED Status

Action

To check the SCB status, look at the LEDs on the SCB faceplate (see Figure 162).

Figure 162: SCB LEDs

Table 93 describes the SCB LED states.

Table 93: SCB LEDs

Color	Label	State	Description
Green	ACTIVE	Flashing (pulsed with out-time proportional to traffic)	I/O interrupts are occurring.
Green	RUN	Blinking (slow and steady)	SCB processor is running. Normally, the blinking is faint and becomes bright only when the SCB is processing many exceptions.
Amber	STAT1	Flashing	Internal diagnostics are running.
Amber	STAT2	Flashing	Internal diagnostics are running.

If all four SCB LEDs are on, but dimly lit, the SCB is probably not seated properly. Tighten the captive screws at the top and bottom of the SCB card carrier.

If the green RUN LED on the SCB is not blinking, the SCB processor is not functioning normally. The SCB might not be connected properly to the backplane. Tighten the screws at the top and bottom of the SCB card carrier. If that does not work, reinstall the SCB.

The SCB has a reset switch on its faceplate above the LEDs. You normally do not use the reset switch. Pushing the reset switch results in a cold restart of the Packet Forwarding Engine, which causes a service interruption for a minute or two. To trip the reset switch, you must access it through a hole in the faceplate with a paper clip or other small probe.