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System Control Board (SCB)

The System Control Board (SCB) performs route lookup, filtering, and switching on incoming data packets, then directs outbound packets to the appropriate FPC for transmission to the network. It occupies the center slot of the card cage, installing into the backplane from the front of the chassis (see Figure 1).

The SCB is hot-pluggable, as described in Field-Replaceable Units (FRUs). For SCB replacement instructions, see Replace the SCB.

The SCB performs the following functions:

SCB Components

The SCB (shown in Figure 5) has the following components:


Figure 5: System Control Board

Table 4: States for SCB LEDs

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


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