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which can be removed without turning the power off
to the entire system).
ROS (read-only storage). Storage which does not
support writing.
SCSI (small computer system interface). A
standard bus interface used to connect peripherals
such as disk drives or tape drives.
SIB (system interface board). The SIB is a
system board which controls the power supply and
the RS-485 interconnect bus.
SIMM (single in-line memory module). See
memory module.
SMP. Symmetric multiprocessor.
SRN (service request number).
SSBus (subsystem bus). A special bus used to
interconnect the BUMP and some local resources
X-2
Service Guide
such as the EEPROM, the flash EEPROM, and the
non-volatile RAM.
SSF (system service facility). See SystemGuard.
SYSID (system identification). Identifies part of
the EEPROM containing important data such as
the system serial number, remote access rights,
dial-out phone numbers, and other information.
SystemGuard. The firmware maintenance
programs which run on the bring-up
microprocessor (BUMP). It enables an operator to
manage power supplies, check system hardware
status, update various configuration parameters,
investigate problems, and perform tests.
VPD (vital product data). Certain vital product
data (VPD), such as the product serial number and
status information, is stored on each board.
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