CEC enclosure location codes (Models 981, 985, 986)

You can identify the CEC enclosure in which a field replaceable unit (FRU) is plugged by its location code. The first character of the location code is always U followed by a four-character feature code or enclosure type, as shown in the following example:
  • U78C9.001.10ABCDE-P1-C14
In this example, the enclosure type is 78C9. The next three characters of the location code indicate the model of the enclosure (001 in the example). The next string of characters provides the enclosure serial number (10ABCDE in the example).
CEC enclosures for Models 981, 985, 986 are normally feature code U78C9.001.
Table 1. Feature codes and related systems
Feature code (Utttt) System For storage model
U78C7.001 8408-E8E 982, 988
U78C9.001 8286-42A 981, 985, 986
U78CB.001 8284-22A 980, 984
The CEC enclosure type (feature code) label is on the top of the CEC enclosure, behind the front cover, above the drive enclosure.
Table 2 summarizes the CEC enclosure assembly with references to figures that display location codes.

For part numbers, see CEC enclosure part numbers, Models 981, 985, 986.

Table 2. Summary of CEC enclosure assembly locations
Assembly Reference
CEC enclosure front location codes Figure 1
CEC enclosure top location codes Figure 2
CEC enclosure rear location codes Figure 3

CEC enclosure front overview

Figure 1. CEC enclosure location codes (front view) (Models 981, 985, 986)
POWER8 front view of CEC enclosure location codes
Table 3. CEC enclosure location codes (front)
Location code Part name Connector
Un-D1 CEC enclosure control panel assembly  
Un-P1-T5
Un-P1-T6		 Not used USB 3.0
Un-P2 CEC enclosure disk drive backplane  
Un-P2-D1 to D12 CEC enclosure disk drive  
Un-P2-D27 Not used  

CEC enclosure top overview

Figure 2. CEC enclosure location codes (top view) (Models 981, 985, 986)
CEC enclosure location codes (top), Model 981
Table 4. CEC enclosure location codes (top)
Location code Part name Connector
Un-A1 CEC enclosure fan 1  
Un-A2 CEC enclosure fan 2  
Un-A3 CEC enclosure fan 3  
Un-A4 CEC enclosure fan 4  
Un-P1 CEC enclosure system backplane (Includes embedded FSP Flexible Service Processor function)  
Un-P1-C13 CEC enclosure vital product data (VPD) card  
Un-P1-C14 CEC enclosure SAS RAID internal adapter  
Un-P1-C15 CEC enclosure card filler (SAS RAID)  
Un-P1-C16 to C31 CEC enclosure memory module  
Un-P1-C32 CEC enclosure processor module  
Un-P1-C33 CEC enclosure processor module  
Un-P1-E1 CEC enclosure time-of-day battery  
Un-P2 CEC enclosure disk drive backplane  
Un-Y1 CEC enclosure firmware  

CEC enclosure rear overview

Figure 3. CEC enclosure location codes (rear view) (Models 981, 985, 986)
CEC enclosure location codes (rear view)
Table 5. CEC enclosure location codes (rear view)
Location code Part name Connector
Un-E1 CEC enclosure power supply 1  
Un-E2 CEC enclosure power supply 2  
Un-E3 CEC enclosure power supply 3  
Un-E4 CEC enclosure power supply 4  
Un-P1 CEC enclosure system backplane (Includes embedded FSP Flexible Service Processor function)  
Un-P1-C1 Not used  
Un-P1-C1-T1 Not used Serial
Un-P1-C1-T2 Not used USB 2.0
Un-P1-C1-T3 Not used USB 2.0
Un-P1-C2 Not used  
Un-P1-C3 CEC enclosure PCIe two-port card  
Un-P1-C3-T1   CXP (PCIe)
Un-P1-C3-T2   CXP (PCIe)
Un-P1-C4 Not used  
Un-P1-C5 CEC enclosure PCIe two-port card  
Un-P1-C5-T1   CXP (PCIe)
Un-P1-C5-T2   CXP (PCIe)
Un-P1-C6 CEC enclosure PCIe two-port card  
Un-P1-C6-T1   CXP (PCIe)
Un-P1-C6-T2   CXP (PCIe)
Un-P1-C7 CEC enclosure PCIe two-port card  
Un-P1-C7-T1   CXP (PCIe)
Un-P1-C7-T2   CXP (PCIe)
Un-P1-C8 CEC enclosure I2C interface card assembly  
Un-P1-C8-T1   I2C (to RPC)
Un-P1-C8-T2   I2C (to RPC)
Un-P1-C9 Not used  
Un-P1-C10 CEC enclosure Ethernet four-port card  
Un-P1-C10-T1   Ethernet (LPAR)
Un-P1-C10-T2   Ethernet (LPAR)
Un-P1-C10-T3   Ethernet customer network (optional feature, if used)
Un-P1-C10-T4   Ethernet customer network (optional feature, if used)
Un-P1-C11 CEC enclosure Ethernet adapter (10 Gb and 1 Gb)  
Un-P1-C11-T1 Ethernet customer network, 10 Gb optical (optional feature, if used)
Un-P1-C11-T2 Ethernet customer network, 10 Gb optical (optional feature, if used)
Un-P1-C11-T3 Ethernet customer network 1 Gb RJ45 (optional feature, if used)
Un-P1-C11-T4 Ethernet customer network 1 Gb RJ45 (optional feature, if used)
Un-P1-C12 CEC enclosure RS-485 serial-interface card  
Un-P1-C12-T1   RS-485 serial (to RPC)
Un-P1-C12-T2   RS-485 serial (to RPC)
Un-P1-T1 Not used USB 3.0
Un-P1-T2 Not used USB 3.0
Un-P1-T3 HMC port 1 (used for private network) Ethernet (service processor)
Un-P1-T4 HMC port 2 (used for private network) Ethernet (service processor)