SSI
EPS2U Power Supply Design Guide, V2.1
6DC Output Specification
6.1Output Connectors
The power supply shall have one of the two following output connector and wire harness configurations, depending upon the type of 12V rail configuration needed by the system.
6.1.112V Power Rail Configurations
There are two types of 12V rail configurations for systems: ‘Common plane’ and ‘split plane’ processor power delivery. The ‘common plane’ system has both processors powered from a single 12V rail (+12V1) from the power supply. The ‘split plane’ system has both processors powered from separate 12V rails (+12V1 and +12V2), one dedicated to each processor. The system, in both cases, has an additional 12V rail to power the rest of the baseboard +12V loads and dc/dc converters. +12V1, +12V2, and +12V3 should not be connected together on the baseboard to ensure that 240VA protection circuits in the power supply operate properly.
Table 6: 12V Rail Summary
| Common Plane System |
| Split Plane System | |
+12V1 |
| Processors | +12V1 | Processor 1 |
|
|
|
|
|
+12V2 |
| Baseboard components other | +12V2 | Processor 2 |
|
| than processors |
|
|
+12V3 |
| Drives and peripherals | +12V3 | Baseboard components other than |
|
|
|
| processors |
|
|
|
|
|
|
|
| +12V4 | Drives and peripherals |
|
|
|
|
|
- 12 -