IBM Power Series Handbook page 150

Using location codes
Use the following table to link to a specific topic that you need additional information on when reading
your location code.
Table 35. Location code topics
Location code topics
"Location code overview"
"Physical location codes" on page 139
"Logical location codes" on page 139
"Location code format" on page 139
"Location code labels" on page 140
"Worldwide unique identifier" on page 140
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 has the known conversions listed. 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 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. If the expansion unit does not have a
display, use the display of the attached system unit, or use the process of elimination by tracing the
cables from the system unit to the expansion unit. Record the unit's 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 there is a problem
in the firmware. Contact your next level of support.
138
Finding parts, locations, and addresses
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, U7879.001.
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, U7879.001.10ABCDE-P3-C31-T2-L23. (The
system serial number is the 10ABCDE in the previous
example.) The P3, C31, T2, and L23 all contain an
alphabetic character that is identified in the Location
code labels table.
Provides a definition of a worldwide unique identifier.
This group of digits follows the resource code labels and
always begins with the letter W.