HP dc7900, Dc7900 KP721AV 7.2.3 Energy Star Compliancy

Power and Signal Distribution

Figure 7-4 shows the power supply cabling for CMT systems.

P9

P10

P11

P4, P5, P9, P10, P11

P6

P8

P8

5 4 3 2 1

P4

P5

P3

4

3

2

1

2

4

P3

P6

Power Supply

1

3

P1

1

2

3

4

Unit

13

P1

24

1

12

Pin

Pin

Pin

Conn

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

Pin 7

Pin 8

Pin 9

10

11

12

P1

+3.3

+3.3

RTN

+5

RTN

+5

RTN

POK

5 aux

+12

+12

+3.3

P1 [1]

+3.3

-12

RTN

PS On

RTN

RTN

RTN

PSDet

+5

+5

+5

RTN

P3

RTN

RTN

VccP

VccP

P4, 5, 9,

+3.3

RTN

+5.08

RTN

+12

10, 11

P6

+12

RTN

RTN

+5

P8

+5

RTN

RTN

+12

NOTES:

Connectors not shown to scale. All + and - values are VDC. RTN = Return (signal ground) GND = Power ground

RS = Remote sense

POK = Power ok (power good)

[1] This row represents pins 13–24 of connector P1.

Figure 7-4. CMT Power Cable Diagram

7.2.3 Energy Star Compliancy

The standard USDT power supply unit is 87 percent efficient and compliant with the Energy Star 4.0 specification. The standard power supply unit for SFF and CMT systems is Energy Star

3.0-compliant. An Energy Star 4.0 (80Plus Bronze-compliant) power supply unit is available as an option for the SFF and CMT form factors.

Technical Reference Guide www.hp.com 7-5