IBM Power Series Handbook page 39

Location code topics
"Location code overview"
"Physical location codes"
"Logical location codes" on page 28
"Location code format" on page 28
"Location code labels" on page 29
"Worldwide unique identifier" on page 29
Location code overview
Servers (system unit and expansion units) use physical location codes to provide mapping of replaceable
units. Location codes are produced by the server's firmware, which structures them so that they can be
used to identify specific parts in a system. The location code format is the same for all servers.
If you are working with a specific location code, the unit type and model immediately follow the first
character (Utttt.mmm). Match the unit type and model to a link, as shown in the Unit type and locations
table.
If the location code ends with -Txx-Lxx, the server's firmware could not identify the physical location.
When a physical location cannot be identified, a logical location code is provided. Where logical location
codes occur in enclosures, the locations topic for the enclosure lists the known conversions. For logical
location codes with no conversion, contact your next level of support.
If the location code begins with UTMPx, the expansion I/O unit's machine type, model, and serial
number have not been set yet and this is a temporary unit identifier. To identify the unit, examine the
display panels on all of the expansion I/O units that are connected to the server until you find one with
the same characters in the first 5 digits of the top line in the unit's display. Record the unit's real machine
type and model from the unit label. Match the unit's machine type and model in the Unit type and
locations table and follow the link to determine the service information.
Note: Locations for units that are not in the preceding list are either not supported or have a problem in
the firmware. Contact your next level of support.
Physical location codes
Physical location codes provide a mapping of logical functions and components (such as backplanes,
removable modules, connectors, ports, cables, and devices) to their specific locations within the physical
structure of the server.
Description
Contains background information on the use of location
codes.
Provides a definition for physical location code.
Provides a definition of what a logical location code is.
Provides descriptive information of the Un value in the
location code string. For example, U789C.001.
Provides a table that identifies and defines the location
code labels. The location code labels begin with an
alphabetic character and follow the system serial number.
For example, U789C.001.10ABCDE-P3-C31-T2-L23. The
system serial number is 10ABCDE in the previous
example. P3, C31, T2, and L23 all contain an alphabetic
character that is identified in the Location code labels
table.
Provides a definition for the world unique identifier. This
group of digits follows the resource code labels and
always begins with the letter W.
Finding parts, locations, and addresses
27