IBM iSeries 270 Service Manual page 611

SDIOP
Storage Device I/O Processor.
secondary link
The optical connection between two remote bus adapter cards.
sign-on
The procedure by which the user starts working at a workstation.
SIMM Single in-line memory module.
single bus connection
Only one bus is connected to the optical link card. One connector is not used.
SPCN System Power Control Network.
SPD bus
An AS/400 input/output bus architecture.
SRC System reference code. A group of characters that identifies the machine status or a specific error
condition. The system reference code can be displayed on the console from the problem log.
system ASP
The auxiliary storage pool where system programs and data reside. It is the storage pool used if a
storage pool is not defined by the user. See also auxiliary storage pool and user ASP.
system reference code
A group of characters that identifies the machine status or a specific error condition. The system
reference code can be displayed on the console from the problem log.
tower A frame-like structure that, since the introduction of the 3xx/4xx models, has been used to
repackage devices formerly housed in racks. Towers provide the equivalent function of racks and
have since replaced racks.
A tower can be used for either the system unit or for system expansion. The system unit always
contains the processor(s). Towers are standalone and usually have black covers. Like racks,
towers can vary in height.
UEPO Unit emergency power-off.
upgrade
To change the system configuration to a later level.
URC Unit reference code. Last 4 characters of SRC.
user ASP
One or more auxiliary storage pools used to isolate journals, journal receivers, and save files from
the other system objects stored in the system ASP. See also auxiliary storage pool and system
ASP.
vital product data
A structured description of a device or program. For devices, it is recorded in the device at
manufacture and includes at least the type, model, serial number, and installed features. It may
include the manufacturer's ID and other fields. For programs, it is compiled as a data area
accompanying the program and includes the name of the licensed program or Licensed Internal
Code group, the release and modification, the program module names, the national language or
languages selected, and possibly other fields. Vital product data is transferred from the device to
the system and is retained for display. Vital product data is also visible on the device name plate
or a similar tag.
VLIC Vertical Licensed Internal Code.
VPD See vital product data.
Analyze hardware problems
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