B&B Electronics PC Watchdog Timer Card ATXWDT Especificaciones descargar pdf (Pagina 19)

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SRMK2 Internet Server Technical Product Specification 19

Table 5: Baseboard Power Connector (P3)

Pin Signal Name 20 AWG Wire Pin Signal Name 20 AWG Wire

1 HECALERT#* N/A 6 SMB_Data* N/A

2 Ground Black 7 SMB_CLK* N/A

3 Ground Sense Black 8 +3.3V Sense Brown

4 PWR_ON# Green 9 PWRGOOD Grey

5 -12V Blue 10 +5V Sense Red

* These pins are not stuffed or used on the SRMK2 power supply

Table 6: SCSI Backplane Power Connector (P4)

Pin Signal Name 20 AWG Wire

1 +12V Yellow

2 +12V Yellow

3 Ground Black

4 Ground Black

5 +3.3V Orange

6 +5V Red

2.2.2 DC Power Supply

The SRMK2D model ships with a –48V DC power supply. The output of the DC power supply is

electrically identical to that of the AC power supply (see Table 3 for reference), it shares the

same physical dimensions as the AC power supply, the same mounting, and the same power

cabling to the motherboard. It does vary, however, in it’s electrical specification for line input and

has a different interface on the rear of the chassis than the AC module. The interface on the

back of the DC power supply has four phillips screws that are protected by a cover for shipping.

Removing the cover reveals the four screws. A label should show the screw markings to be: A+

A- B+ B- . The A+ and A- connectors can be attached to a primary power source for the

server, while the B+ and B- leads can be connected to a secondary power source for redundant

power sourcing in case of primary source failure. Table 7 shows the input parameters for the –

48V DC power supply.

Table 7: -48V DC Power Supply Input Parameters

Parameter Min Nom Max Unit

Vin (-48VDC) -36.0 -48.0 -72.0 VDC

2.2.3 BTU information

BTU’s (British Thermal Units) are a standard for measuring the thermal output of a device. For

reference, one BTU equals the heat that will raise the temperature of one pound of water by one

degree Fahrenheit. In physical terms, 1 BTU = 1054 joules. Listed below is the maximum BTU

output of the SRMK2 system and a loaded system BTU output. System configuration of the

loaded system is described in Table 9.

The BTU maximum rating was derived by taking the maximum wattage output of the power

supply (202.9W), dividing it by the lowest efficiency of the power supply (70% or 0.70) and

multiplying by the BTU conversion number of 3.41. Remember that these numbers are rated at

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 114 115

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B&B Electronics PC Watchdog Timer Card ATXWDT Especificaciones Pagina 19