Clock+ Board - Sun Microsystems Enterprise 3500 System Reference Manual

B.6

Clock+ Board

The clock+ board is located at the rear of the cabinet, at the right side of the card
cage. See .
FIGURE B-12
The clock+ board receives cooling air from the PCM located above the two board
slots on the right side of the card cage.
The clock+ board provides 16 pairs of system clocks, 32 pairs of processor clocks.
The processor clock frequency is set to match the lowest-frequency processor in the
system. All processors run at the same clock speed. The system clock and the
processor clocks are derived from a single clock source. The frequency of the clock
source as well as the processor and system clocks are programmable and set by
firmware.
The clock+ board also includes central devices including serial ports, keyboard and
mouse, and a time of day (TOD) chip.
Clock+ Board
FIGURE B-12
Appendix B Functional Description B-15