Intel SRMK2 - Server Platform - 0 MB RAM User manual

The Intel®SRMK2 Internet Server may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are documented in the
Intel®SRMK2 Internet Server Specification Update.
February 26, 2001
iPN A39185-001
Intel®SRMK2 Internet Server
Technical Product Specification

Revision History
Revision Revision History Date
1.0 Original draft October 18, 2000
1.1 First update January 25, 2001
1.2 Second update February 26, 2001
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or
otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel's Terms and Conditions of
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infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life
saving, or life sustaining applications.
Intel retains the right to make changes to specifications and product descriptions at any time, without notice.
The Intel®SRMK2 Internet Server may contain design defects or errors known as errata that may cause the product to deviate
from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
Intel Corporation
P.O. Box 5937
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or call in North America 1-800-548-4725, Europe 44-0-1793-431-155, France 44-0-1793-421-777,
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†Third-party brands and names are the property of their respective owners.
Copyright 2000, Intel Corporation. All rights reserved.

Intel®SRMK2 Internet Server Technical Product Specification iii
Preface
This Technical Product Specification (TPS) identifies components and software integrated with
the Intel®SRMK2 Internet Server. These components include the serverboard, riser card, front
panel board, hot-swap backplane, system BIOS, Advanced Server Management (ASM) software,
chassis, and power supply. Certifications, reliability, and serviceability of the system are also
discussed.
Intended Audience
This TPS provides detailed technical information about the SRMK2 Internet Server and its internal
components. This information is intended for xSPs, OEM engineers, vendors, system integrators,
and other engineers and technicians who need this level of information. It is not intended for
general audiences.
Typographical Conventions
This section describes the conventions used in this specification. Not all of these symbols and
abbreviations appear in all specifications of this type.
!! NOTE
Notes call attention to important information.
CAUTION
Cautions are included to help you avoid damaging hardware and losing data.
WARNING
Warnings indicate conditions that, if not observed, can cause personal injury.

Intel®SRMK2 Internet Server Technical Product Specification iv
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Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification v
Contents
1INTRODUCTION...............................................................................................................................................11
2CHASSIS DESCRIPTION...............................................................................................................................13
2.1 EXTERNAL CHASSIS FEATURES..............................................................................................................13
2.1.1 Chassis Dimensions................................................................................................................................13
2.1.2 Colors of Chassis....................................................................................................................................13
2.1.3 Front View of Chassis.............................................................................................................................14
2.1.4 Rear View of Chassis ..............................................................................................................................15
2.2 INTERNAL CHASSIS FEATURES...............................................................................................................15
2.2.1 AC Power Supply....................................................................................................................................15
2.2.2 DC Power Supply....................................................................................................................................19
2.2.3 BTU information.....................................................................................................................................19
2.2.4 System Cooling........................................................................................................................................20
2.2.5 System Peripheral Bays...........................................................................................................................21
2.2.6 System Interconnection............................................................................................................................21
2.3 SYSTEM CONFIGURATION......................................................................................................................23
3SRMK2 SERVERBOARD DESCRIPTION..................................................................................................24
3.1 OVERVIEW.................................................................................................................................................24
3.2 SERVERBOARD LAYOUT..........................................................................................................................25
3.3 PROCESSORS...............................................................................................................................................27
3.4 CHIPSET .....................................................................................................................................................28
3.4.1 ServerWorks CNB30LE North Bridge Chip...........................................................................................28
3.4.2 ServerWorks OSB4 South Bridge Chip..................................................................................................29
3.5 MEMORY....................................................................................................................................................30
3.6 SCSI HOST BUS INTERFACE....................................................................................................................31
3.6.1 SCSI Hard Drive LED Connector (Optional)........................................................................................31
3.7 IDE INTERFACE.........................................................................................................................................31
3.8 USB.............................................................................................................................................................31
3.9 I/O CONTROLLER.....................................................................................................................................32
3.9.1 Serial Port...............................................................................................................................................32
3.9.2 Diskette Drive Controller .......................................................................................................................32
3.9.3 Keyboard and Mouse Interface...............................................................................................................32
3.9.4 Real-Time Clock, CMOS SRAM, and Battery.........................................................................................32
3.10 INTEL®82559 10/100 ETHERNET CONTROLLERS................................................................................33
3.11 VIDEO INTERFACE....................................................................................................................................33
3.12 HARDWARE MONITOR............................................................................................................................34
3.13 WAKE ON RING AND RESUME ON RING...............................................................................................35
3.13.1 Wake on Ring.....................................................................................................................................35
3.13.2 Resume on Ring..................................................................................................................................35
3.14 SPEAKER....................................................................................................................................................35
3.15 FAN SUPPORT ...........................................................................................................................................36
3.16 BASEBOARD PROGRAMMING..................................................................................................................36
3.16.1 PCI Configuration Space Map...........................................................................................................36
3.16.2 Interrupts ...........................................................................................................................................36
3.16.3 SMI and NMI Routing........................................................................................................................37
3.16.4 System Management Bus (SMB) ........................................................................................................37
3.17 BASEBOARD CONNECTORS AND JUMPERS...........................................................................................38

Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification vi
3.17.1 Back Panel I/O Connectors................................................................................................................39
3.17.2 Midboard Connectors........................................................................................................................41
3.17.3 Front Panel Connector.......................................................................................................................48
3.18 JUMPER BLOCKS.......................................................................................................................................50
3.19 THERMAL CONSIDERATIONS..................................................................................................................52
3.20 DC VOLTAGE REGULATION...................................................................................................................53
4PCI RISER BOARD..........................................................................................................................................54
4.1 INTRODUCTION........................................................................................................................................54
4.2 RISER BOARD PCI BUS CONNECTORS....................................................................................................54
4.3 PCI ADD-IN CARDS...................................................................................................................................54
4.4 RISER BOARD PCI INTERRUPT ROUTING MAP...................................................................................55
5FRONT PANEL BOARD..................................................................................................................................57
5.1 INTRODUCTION........................................................................................................................................57
5.2 FRONT PANEL SWITCHES.......................................................................................................................57
5.3FRONT PANEL LED INDICATORS...........................................................................................................58
5.4 FRONT PANEL I/O CONNECTOR............................................................................................................58
6SCSI BACKPLANE...........................................................................................................................................59
6.1 INTRODUCTION........................................................................................................................................59
7BIOS DESCRIPTION.......................................................................................................................................61
7.1 OVERVIEW.................................................................................................................................................61
7.2 SYSTEM BIOS............................................................................................................................................61
7.2.1 Configuration Utility...............................................................................................................................62
7.2.2 CMOS Configuration RAM Summary.....................................................................................................62
7.2.3 Flash Memory Update Utility..................................................................................................................62
7.2.4 Fail-Safe BIOS Extensions......................................................................................................................62
7.2.5 System Flash ROM Layout......................................................................................................................62
7.3 SYSTEM BIOS............................................................................................................................................63
7.3.1 Auto-Configuration Features ..................................................................................................................63
7.3.2 Performance Features.............................................................................................................................67
7.3.3 Reliability Features..................................................................................................................................69
7.3.4 System Services.......................................................................................................................................71
7.3.5 Boot Options...........................................................................................................................................74
7.3.6 OEM Customization................................................................................................................................75
7.3.7 SMBIOS Support.....................................................................................................................................78
7.3.8 Soft Power Switch....................................................................................................................................79
7.3.9 POST Memory Manager Support...........................................................................................................80
7.3.10 ACPI Support.....................................................................................................................................80
7.4 FAIL-SAFE BIOS EXTENSIONS................................................................................................................81
7.4.1 LAN Alerts...............................................................................................................................................81
7.4.2 WatchDog Timer (WDT)........................................................................................................................81
7.4.3 Paging Support.......................................................................................................................................82
8FLASH MEMORY UPDATE UTILITY...........................................................................................................83
8.1 LOADING THE SYSTEM BIOS.................................................................................................................83
9ERROR HANDLING, MESSAGES & BEEP CODES..................................................................................84
9.1 ERROR SOURCES AND TYPES..................................................................................................................84
9.2 ERROR HANDLERS....................................................................................................................................84

Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification vii
9.3 ISA BUS ERROR.........................................................................................................................................85
9.3.2 Processor Bus Error...............................................................................................................................86
9.3.3 Memory Bus Error..................................................................................................................................87
9.3.4 System Limit Error..................................................................................................................................87
9.3.5 Processor Failure...................................................................................................................................87
9.4 ERROR MESSAGES AND ERROR CODES..................................................................................................87
10 BIOS SETUP PROGRAM...........................................................................................................................90
10.1 MAINTENANCE MENU............................................................................................................................91
10.2 MAIN MENU..............................................................................................................................................91
10.3 ADVANCED MENU...................................................................................................................................92
10.4 SECURITY MENU......................................................................................................................................93
10.5 BOOT MENU..............................................................................................................................................93
10.6 SYSTEM MANAGEMENT MENU.............................................................................................................94
10.7 EXIT MENU...............................................................................................................................................96
11 CERTIFICATION..........................................................................................................................................97
11.1 SAFETY STANDARDS / CERTIFICATIONS.............................................................................................97
11.2 ELECTROMAGNETIC COMPATIBILITY (EMC) REGULATIONS.........................................................97
11.3 ELECTROMAGNETIC COMPATIBILITY NOTICES (SRMK2S)............................................................98
11.3.1 Japan..................................................................................................................................................98
11.3.2 Canada...............................................................................................................................................98
11.3.3 FCC/emissions disclaimer –Class A (USA)......................................................................................98
11.3.4 Taiwan (BSMI)...................................................................................................................................99
11.4 ELECTROMAGNETIC COMPATIBILITY NOTICES (SRMK2D)...........................................................99
11.4.1 Japan..................................................................................................................................................99
11.4.2 Canada...............................................................................................................................................99
11.4.3 FCC/emissions disclaimer –class B (USA).......................................................................................99
11.5 FCC DECLARATION OF CONFORMITY................................................................................................100
11.5.1 SRMK2D..........................................................................................................................................100
11.5.2 Taiwan (BSMI).................................................................................................................................100
11.6 MANDATORY / STANDARD: CERTIFICATIONS, REGISTRATION, DECLARATIONS.....................101
11.7 ENVIRONMENTAL LIMITS.....................................................................................................................101
12 RELIABILITY AND SERVICEABILITY................................................................................................102
12.1 RELIABILITY...........................................................................................................................................102
12.2 SERVICEABILITY....................................................................................................................................102
13 COMPATIBILITY TESTING...................................................................................................................103
14 SPECIFICATIONS AND CUSTOMER SUPPORT.............................................................................104
14.1 ONLINE SUPPORT ..................................................................................................................................104
14.2 SPECIFICATIONS.....................................................................................................................................104

Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification viii
Conventions and Terminology
This document uses the following terms and abbreviations:
Term Definition
ΩOhms
µA0.000001 amperes
µFmicrofarad
Aamperes (amps)
AC Alternating Current
ACPI Advanced Configuration Power Interface
AGP Accelerated Graphics Port
ASCII American Standard Code for Information Interchange
ASIC Application Specific Integrated Circuit
BIOS Basic Input Output System
Byte 8-bit quantity
CCentigrade
CD Compact Disk
CD-ROM Compact Disk Read Only Memory
CE Community European
cfm Cubic feet per minute
CMOS Complementary Metal-Oxide Semiconductor
CPU Central Processing Unit
DC Direct Current
DCD Data Carrier Detect
DEMKO Danishe Elektriske Materiellkontroll (Danish Board of Testing and Approval of Electrical Equipment)
DIMM Dual Inline Memory Module
DMA Direct Memory Access
DRAM Dynamic Random Access Memory
ECC Error Correction Code
EDO Extended Data Out
EEPROM Electrically Erasable Programmable Read Only Memory
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
EN European Standard (Norme Européenne or Europäische Norm)
ESD Electrostatic Discharge
EU European Union
FFahrenheit
FC-PGA Flip Chip Pin Grid Array
FCC Federal Communications Commission (USA)
FD Floppy Disk
FET Field Effect Transistor
FP Front Panel
FPC Front Panel Controller
FRU Field Replaceable Unit
GB gigabyte (1024 MB)
Hz Hertz (cycles per second)
I/O Input/Output
I2CInter-Integrated Circuit
IDE Integrated Drive Electronics
ISA Industry Standard Architecture
KB kilobyte (1024 bytes)
kg Kilograms
kV Kilovolts

Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification ix
LED Light Emitting Diode
LVD Low Voltage Differential
mA milliamps
MB megabyte (1024 KB)
MBE Multi-bit Error
MIF Management Information database
mm millimeters
ms milliseconds
MTBF Mean Time Between Failure
MTTR Mean Time To Repair
NEMKO Norges Elektriske Materiellkontroll (Norwegian Board of Testing and Approval of Electrical
Equipment)
NIC Network Interface Card
NMI Non-Maskable Interrupt
NVRAM Non-Volatile Random Access Memory
OCP Over-Current Protection
OEM Original Equipment Manufacturer
OTP Over-Temperature Protection
OVP Over-Voltage Protection
PAC PCI/AGP Controller
PCI Peripheral Component Interconnect
Pf picofarad (10-12)
PFC Power Factor Correction
OSB4 PCI-ISA IDE Xcelerator controller
PIO Programmed Input/Output
PLD Programmable Logic Device
POST Power-On Self Test
PPGA Plastic Pin Grid Array
PXE Preboot Execution Environment
RAM Random Access Memory
RPM Revolutions Per Minute
RxD Receive Data
SBE Single-bit Error
SCL Serial Clock
SCSI Small Computer Systems Interface
SDA Serial Data
SE Single Ended
SEEPROM Serial Electrically Erasable Programmable Read Only Memory
SEL System Event Log
SEMKO Sverge Elektriske Materiellkontroll (Swedish Board of Testing and Approval of Electrical
Equipment)
SIO Super I/O
SMB System Management Bus
SMC Standard Microsystems Corporation
SMBIOS System Management BIOS
SMI System Management Interrupt
SMM System Management Module
TTL Transistor-Transistor Logic
TxD Transmit Data
UART Universal Asynchronous Receiving/Transmitting
UL Underwriter’s Laboratories
USB Universal Serial Bus
VVolt
VA Volt amperes
Vac Volts alternating current

Conventions and Terminology
Intel®SRMK2 Internet Server Technical Product Specification x
VCCI Voluntary Control Council for Interference (by data processing and electronic office equipment)
Vdc Volts direct current
Vin Volts in
VRM Voltage Regulator Module
Vrms Volts root-mean-square
WWatts
Wdc Watts direct current
WOL Wake on LAN
WOR Wake on Ring
ZIF Zero Insertion Force

Intel®SRMK2 Internet Server Technical Product Specification 11
1Introduction
This document provides a detailed description of the chassis and system level features of the
Intel®SRMK2 Internet Server. This system is a high-density rackmount server consisting of a
1U chassis and the SRMK2 serverboard. The server will come in two models: A SCSI based
system (SRMK2S) and a SCSI based system with a –48V DC power supply (SRMK2D). Since
both of these systems are based off of the SRMK2S product, this guide has beenwritten to
represent the SRMK2S. Notes and additions have been added to identify discrepancies between
the SRMK2S and the SRMK2D.
Table 1provides a list and brief description of the SRMK2 Internet Server’s key features.
Table 1: Intel®SRMK2S Internet Server key features
Feature Description
1U chassis 1.70” (height) x 16.75” (width behind bezel) x 24” (depth)
Weight Approximately 30lbs in-box shipping weight
Power supply Single 200W AC power supply (200W DC supply comes with the SRMK2D)
Cooling Nine system fans (Eight 40mm and one 17mm)
Rackmounting Two midmount and Front mounting brackets or sliding rails (optional)
Hard disk capacity Support for two 1” U160 Hot Swappable SCSI hard drives for internal
configuration along with an external SCSI channel for external drives
Peripheral bays Single standard slim diskette drive included with system. Optional slim-line
CD-ROM drive available (works in conjunction with the standard diskette).
Peripheral Interfaces Two Ultra 160 SCSI channels, one internal and one external (The internal
channel has two SCA2 connector ports out the front of the machine)
One IDE interface with UDMA support
One rear serial port
Two 10/100 82559 LAN Connectors
One slim-line diskette interface
LED Panel Interface
Two USB ports
Video Interface
Two PS/2 ports
Microprocessor Dual Pentium®III processors in PGA370 sockets
Memory capacity Up to 4 GB of registered PC-100 or PC-133 ECC SDRAM DIMMs
LAN support Integrated dual Intel®82559 Pro/100+ Ethernet controllers featuring PXE 2.0 option
ROM for network installation and booting of operating systems
Add-in card support Passive PCI riser (64-bit/66MHz) supports a low-profile and a full-length (13”) PCI
card
System management Two Heceta 3 hardware monitoring ASIC’s which work in conjunction with Web-
based management software (ASM).
BIOS Intel/AMI BIOS with extensions to enhance server management capabilities

Intel®SRMK2 Internet Server Technical Product Specification 12
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Intel®SRMK2 Internet Server Technical Product Specification 13
2Chassis Description
This section describes the features of the Intel®SRMK2 Internet Server chassis.
2.1 External Chassis Features
2.1.1 Chassis Dimensions
The chassis is 1.70 inches high by 16.75 inches wide behind the bezel by 24.00 inches deep
(measured from the front of the bezel to the deepest portion of the rear bulkhead). The chassis is
designed to be mounted in a relay-style rack using the two right-angle midmount or front mount
brackets provided with the base system that attach to the chassis and two brackets that attach to
the rack . It can also be installed in a standard 19” rack using a sliding rails kit (Optional).
Table 2: Chassis dimensions
Height 1.70” (1U)
Width 16.75” between the slide mounting surfaces
Depth 24” including bezel, 22.41” from front mounting flange to the rear panel
Shipping
Weight 30lbs. maximum configuration (Fully loaded weight including box and all
accessories)
Figure 1: Isometric View of Chassis
2.1.2 Colors of Chassis
The primary exterior of the chassis is unpainted. The bezel is a molded black (GE701) plastic.

Intel®SRMK2 Internet Server Technical Product Specification 14
2.1.3 Front View of Chassis
The front bezel is a multiple-part plastic molding that contains the buttons, the LED indicator light
pipes, and a flip-down door that spans half the width of the bezel and folds down (right striated
portion in Figure 2below). After pulling the flip door down the Power, Sleep, and Reset buttons
as well as the NMI pin hole are revealed. This also reveals the floppy and CD-ROM bays. See
Figure 3for button placement. See Section 5Front Panel Board for a complete description of the
buttons and LEDs.
Figure 2: Front view of chassis with bezel on
Additionally, the front bezel can be removed to reveal the front of the chassis. To access the hot
swappable SCSI hard disk drives, pivot the front panel out and to the right. Figure 3shows the
chassis with the front bezel removed and the front panel in the closed position.
Figure 3: Front view of chassis without bezel
Upon pivoting the front panel out and to the right, the SCSI hard disk drive bays are revealed as
shown in Figure 4below.

Intel®SRMK2 Internet Server Technical Product Specification 15
AHot Swappable SCSI Drives BSlimline CDROM (Optional)
CSlimline Floppy
Figure 4: Front view of chassis without bezel (Does not show Front Panel swung out)
2.1.4 Rear View of Chassis
The input/output connectors are accessible at the back panel of the chassis as shown in Figure 5.
See Section 3.17.1 Back Panel I/O Connectors for detailed descriptions of the rear panel I/O
connectors.
APS/2 Kbd / Mouse DUSB GLow Profile PCI slot
BVideo ESerial Port A HFull Length PCI slot
CDual RJ-45 FU160 SCSI IPower Supply *
*The power supply in the SRMK2D has a different connector
Figure 5: Rear view of chassis
2.2 Internal Chassis Features
2.2.1 AC Power Supply
The SRMK2 Internet Server can use two different power supplies, one being an AC 200W
version which ships with the SRMK2S model and a –48V DC 200W version that ships with the
SRMK2D model. For information on the DC model, see the Section 2.2.2entitled DC Power
Supply. The AC power supply uses a standard IEC 320 power cord and is a single auto-ranging
power factor corrected power supply. The AC power supply rating is described in Table 3.

Intel®SRMK2 Internet Server Technical Product Specification 16
Table 3: 200W power supply output summary
DC Power +3.3VDC at 13.0A Max.
+5 VDC at 22A Max.
+12 VDC at 3.5A Max.
-12 VDC at 0.25A
5V Standby 1A
Total power from supply 202.9W
AC line voltage 90-135,180-265VAC PFC: auto sense
AC line frequency 47 / 63 Hz
2.2.1.1 Power Supply Mechanical Outline
Both AC and DC power supplies are 3.30”wide by 1.60” high by 9.60”in length. The output cable
bundle is separated into two cables; one cable with two connectors for the serverboard, and the
other with a connector for the backplane which in turn powers the HDD’s. The backplane also
has a CDROM power connector.
2.2.1.2 Power Supply Fan Requirements
The power supply relies on cooling provided by two 40mm fans mounted in the chassis in front of
the power supply. These fans are monitored by hardware on the motherboard and the Advanced
Server Management software that comes on the Resource CD in the accessory kit.
2.2.1.3 AC Power Line
The system is specified to operate over two input voltage ranges that are automatically selected
and rated from 100-120VAC and 200-240VAC, at 50 or 60Hz. The power supply incorporates
Power Factor Correction (PFC) as a standard feature. The system is tested to meet these line
voltages, and has been tested (but not specified) at +10% and -10% of the voltage ranges, and ±
3Hz on the line input frequency. The system is specified to operate without error with line source
interruptions not to exceed 20 milliseconds at nominal line conditions and full power supply output
load. The system is not damaged by AC surge ring wave to 2.5kV/500A. This ring wave is a
100kHz damped oscillatory wave with a specified rise-time for the linear portion of the initial half-
cycle of 0.5µsec. Additionally, the system will not be damaged by a unidirectional surge
waveform of 2.0kV /3000A, with a 1.2µsec rise time and 50µsec duration. Further details on
these waveforms can be obtained in ANSI/IEEE STD C62.45-1987.

Intel®SRMK2 Internet Server Technical Product Specification 17
2.2.1.4 DC Connector Requirements
Figure 6and Figure 7show the connector pinouts for the serverboard power connectors. These
mate with the power supply connectors at connector J27 and J39.
Ground
Ground
Ground
Ground
VRM Input Voltage
+3.3V
Ground
Ground
+5VSB
113
12 24
Ground
Ground
+3.3V
+3.3V
+3.3V
Ground
Ground
Ground
VRM Input Voltage
VRM Input Voltage
VRM Input Voltage
+5V
+5V
+12V
Ground
Figure 6: DC connector pinout (J27)
-12V
Ground
1
6
HECALERT#
Ground Sense
PWR_ON#
5 10
SMB_Data
SMB_CLK
+3.3V Sense
PWRGOOD
+5V Sense
Figure 7: DC connector pinout (J39)

Intel®SRMK2 Internet Server Technical Product Specification 18
2.2.1.5 Power Supply Wiring Requirements
The wiring length and the desired wire color-coding are specified in Figure 8.
P2
3.5" ±0.25"
(87.5mm ±6mm)
Main board 2
Conn.
Main
Board
Only one wire tie
at exit of supply
this bundle.
Mini wire ties at
one inch spacing
length of bundle.
Wire exit hole in
power
supply.
0.25"
Max
Bundle A
Bundle B
3.5" (87.5mm)
Edge of supply to center of connector on
PCB.
Wire lengths should vary to
ensure no loops or slack wire.
pin 1 pin 13
P3
P4
SCSI Backplane
Connector
7.75" ±0.25"
(196mm ±6mm)
Bundle C
Figure 8: DC output wire harness
Table 4: Baseboard Power Connector (P2)
Pin Signal
Name 20 AWG Wire Pin Signal Name 20 AWG Wire
1Ground Black 13 VRM Input Red
2Ground Black 14 VRM Input Red
3Ground Black 15 VRM Input Red
4Ground Black 16 VRM Input Red
5+3.3V Orange 17 Ground Black
6+3.3V Orange 18 Ground Black
7+3.3V Orange 19 Ground Black
8+3.3V Orange 20 Ground Black
9Ground Black 21 +5V Red
10 Ground Black 22 +5V Red
11 +5VSB Purple 23 Ground Black
12 Ground Black 24 +12V Yellow

Intel®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
1HECALERT#* N/A 6SMB_Data* N/A
2Ground Black 7SMB_CLK* N/A
3Ground Sense Black 8+3.3V Sense Brown
4PWR_ON# Green 9PWRGOOD 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
3Ground Black
4Ground 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 3for 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 7shows 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

Intel®SRMK2 Internet Server Technical Product Specification 20
the worst case (lowest efficiency) of the power supply. Under nominal conditions the power
supply should perform above the 70% efficiency level which will lower the BTU rating.
Table 8: Overall BTU Ratings
BTU (Loaded) BTU (Max)
314 BTU 988 BTU
Table 9: Loaded System Configuration
Device Configuration Manufacturer /
Type
CPU #1 733MHz (133 FSB) Intel Pentium III
CPU #2 733MHz (133 FSB) Intel Pentium III
Memory 256MB Micron 133
HDD #1 SCSI 9.1GB Quantum Atlas V
HDD #2 SCSI 9.1GB Quantum Atlas V
CD Slimline CD Teac CD224EB
Floppy Slimline Floppy Sony MPF 720-3
Table 10: Loaded System Power Draw
Voltage Rail Current
(Measured) Power (W)
+3.3V 4.1A 13.53 W
+5V 6.7A 33.5 W
-5V 0.1A 0.5 W
+12V 1.3A 15.6 W
-12V 0.1A 1.2 W
+5VSB 0.1A 0.5 W
Total 64.83 W
2.2.4 System Cooling
Nine 40mm fans provide cooling for the system. Two of the nine fans are dedicated to cooling the
power supply. Six of the fans provide cooling for the processor, memory, and serverboard. One
fan cools the full-length PCI slot (this last fan is 40mm x 17mm and is a bit thinner than the other
40mm x 28mm fans). A two-speed control circuit powers the fans and is located on the SCSI
backplane. The control circuit is driven by a sensor that is located on the front panel to monitor
the incoming air temperature. The fans have a tachometer output that can be sampled through the
ServerWorks®ServerSet™III LE chipset. The fans can be replaced by removing the top cover,
unplugging the fan connector from the serverboard, lifting the fan out of the fan bracket, and then
inserting the new fan. Additionally, a baffle will be added to help keep the processors and the
memory cool. You should always replace the baffle in the system when you are through working
on the system.