Embedded Peripherals; Power Subsystem; Uninterruptible Power System - HP 3000 Series Handbook

For HP Internal Use Only
Multifunction 1/0
The 1v1ultifunction Input/Output
(IviFIO)
card provides most of the core I/0 functionality.
Different MFIO cards are used in the HP 3000 and HP 9000 system configurations. With the
HP 3000, the SCSI, LAN (ThinLan and AUI ports), Local Console, Remote Console, and UPS
connection (through the CPU card) functions are provided. With the HP 9000, the SCSI,
Centronics, Local Console, Remote Console, UPS connection, and up to 13 other MUX port
functions are provided. Refer to the block diagram for appropriate path addressing.
Embedded Peripherals
Several devices are supported in the SPU enclosure. There is room for two half-height
removable-media devices and two 3.5 inch fixed disk drives. Refer to the appropriate HP 3000
or HP 9000 system configuration guide for a list of currently supported devices. The internal
devices are interconnected via an internal SCSI I/0 bus that is driven by the MFIO card.
The last device on the internal bus (usually the primary disk if present, at address six) must
terminate that end of the bus. This is usually provided by the installation of termination
resistor packs or the setting of a jumper to enable termination. The SCSI bus also extends
outside the SPU via a connector on the MFIO card. This connector should also have a
terminator installed unless external devices are connected providing termination at the LAST
device in the chain.
Power Subsystem
The power supply internal to the SPU provides DC power to all circuit boards and peripherals
installed in the SPU. It accepts AC input (autoranging to 110 or 230 V.A.C. levels) and
provides the +5, +12, and -12 DC voltages needed within the system. There are no test
points or adjustments on the power supply. A System Power Control Module (SPCM) board
located within the supply provides control and monitoring of the supply. The SPCM informs
the CPU that power is in or out of spec and signals temperature or impending power-loss
problems.
Uninterruptible Power System
These computers can use an optional Uninterruptible Power System (UPS) to supply power in
the event of a power outage. The UPS is a standalone product that is connected to the AC
input line source. The SPU is then connected to the UPS with an AC convenience cord and
a serial data cable. If an AC power loss occurs, the UPS will continue to supply AC to the
SPU for a minimum of 15 minutes. In addition, an audible alarm tone sounds, a LED lights
on the UPS front panel, and notification of the power loss will be sent to the SPU. The SPU
can then continue to run and monitor the UPS for the return of main AC input power. The
SPU Operating System software can be configured to gracefully shutdown the system within a
predetermined time if the UPS has not signaled the return of power. Refer to the appropriate
Operating System administration manuals for details on how to control this feature.
9-4 Functional Description