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Chapter 1
Overview
Utilities Subsystem
32
- Status LEDs for the SBA cable OL*, the cell OL*, and the I/O backplane OL*
PM3 Functionality
The PM3 performs the following functions:
1) FEPS control and monitoring. For each of the BPSs in the FEPS.
Superdome has six BPS and the UGUY sends 5 V to the BPS for use by the fault collection circuitry.
2) FAN control and monitoring.
In addition to the blowers, there are five I/O system fans (above and between I/O bays). These fans run at full
speed all the time (there is no fan speed signal).
3) Cabinet mode and cabinet number fan out.
There is a surface mount DIP switch on the HUCB (UGUY backplane) can be used to configure a Superdome
cabinet for normal use or as an SD16 cabinet. Use the 16-position thumb switch on the UGUY to set the
cabinet number. Numbers 0-7 are for CPU oriented cabinets and numbers 8-15 are for I/O-only cabinets.
4) Local Power Monitor (LPM) interfaces.
Each big board (cell board, I/ O backplane, and main backplane) contains logic that controls conversion of 48
V to lower voltages. The PM3 interfaces to the LPM with the board-present input signal to the PM3 and the
power-enable output signal from the PM3.
5) Front and rear panel board controls.
System Clocks
The sx2000 clocks are supplied from the backplane and to the backplane crossbar ASICs and the cell boards.
There is no distribution of the system clocks to the I/O backplanes. Instead, independent local clock
distribution is provided on the I/O backplane.
Managemant Processor (SBCH and SBC)
The management processor (MP) is comprised of two PCBs, the SBC (single-board computer) and the single
board computer hub (SBCH), forms one functional unit. The MP is a hot-swappable unit powered by +5 V
HKP that holds the MP configuration parameters in compact flash and the error and activity logs and the
complex identification information (complex profile) in battery backed NVRAM. It also provides the USB
network controller (MP bus). Each complex has one MP per complex. It cannot be setup for redundancy.
However, it is not a single point of failure for the complex because it can be hot-swapped. If the MP fails, the
complex can still boot and function. However, the following utility functionality is lost until the MP can be
replaced: