14.5U 4X SDR/DDR InfiniBand Switch Platform User`s Manual
Contents
1. FLEXTRONICS 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual Rev 0 10 2 Copyright 2007 Flextronics International and its licensors All rights reserved 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual Contents Contents About this Manual Revision History Chapter 1 Overview 1 1 Ordering Information Chapter 2 Switch Installation and Basic Operation 2 1 Installation Safety Warnings 2 2 Installation Steps 2 2 1 Physical Installation 2 2 2 Power Connections 2 2 3 InfiniBand Copper Cable Installation 2 2 4 Switch Power Up 2 2 4 1 Power Supply and Spine Board Indicator Status at Power ON 2 2 5 InfiniBand Fabric Initialization and Management 2 2 6 Hot Swap Extraction Insertion of Leaf Boards 2 2 6 1 Extracting a Leaf Board 2 2 6 2 Inserting a Leaf Board 2 2 7 Hot Swap Extraction Insertion of Spine Boards 2 2 7 1 Extracting a Spine Board 2 2 8 Inserting a Spine Board 2 2 9 Hot Swap Extraction Insertion Power Supply Modules 2 2 9 1 Extracting a PSU 2 2 9 2 Inserting a PSU 2 2 10 Hot Swap Replacement of Fan Modules 2 2 10 1 Extracting the Leaf Fan Module 2 2 10 2 Inserting the Leaf Fan Module 2 2 10 3 Extracting a Spine Fan Module 2 2 10 4 Inserting Spine Fan Module 2 2 11 Over temperature Shutdown Mechanism Chapter 3 Switch Management Tools 3 1 IBADM Features 3 1 1 IBADM Requirements 3 1 2 How to Get IBADM 3 2 Embedded Management Tools Rev 0 10 14 5U 4X SD2. activity do not work on the equipment or connect or disconnect cables 6 Copper InfiniBand Cable Connecting Disconnecting Copper InfiniBand cables are heavy and not flexible as such they should be carefully attached to or detached from the connectors Refer to the cable manufacturer for special warnings instructions A A A A A A Rev 0 10 Switch Installation and Basic Operation 10 7 Rack Mounting and Servicing When this product is mounted or serviced in a rack special precautions must be taken to ensure that the system remains stable In general you should fill the rack with equipment starting from the bottom to the top 8 Equipment Installation This equipment should be installed replaced or serviced only by trained and qualified personnel 9 Equipment Disposal Disposal of this equipment should be in accordance to all national laws and regulations 10 Local and National Electrical Codes This equipment should be installed in compliance with local and national electrical codes 11 Norway Electrical Codes Electrical Hazard The switch platform must be connected to an earthed mains socket outlet 12 Norway Electrical Codes Electrical Hazard In Norway this system should be connected to the IT power distribution system only A A A A A A Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 2 2 Installation Steps Installation and initialization
3. holding both its upper and lower handles See Figure 7 b Figure 7 Leaf Fan Module Extraction Retaining Screw a Unscrewing a Retaining Screw b Sliding out the Leaf Fan Module 2 2 10 2 Inserting the Leaf Fan Module 1 Slowly slide in the new Leaf fan module while holding both its upper and lower ejectors 2 Screw back the four captive screws 3 Make sure that the six green LEDs are turned on indicating that all fans are rotating 2 2 10 3 Extracting a Spine Fan Module 1 Unscrew the two captive screws that hold the Spine fan module to the chassis See Figure 8 a 2 Pull out the fan module from its handle See Figure 8 b Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 19 Figure 8 Spine Fan Module Extraction Retaining Screw a Unscrewing a Retaining Screw b Sliding out the Spine Fan Module 2 2 10 4 Inserting a Spine Fan Module 1 Slide in the new Spine fan module 2 Screw back the two captive screws 3 Make sure that the two green LEDs are turned on indicating that the fans are rotating 2 2 11 Over temperature Shutdown Mechanism Each Leaf card and each Spine card has its own on board thermal sensor to track PCB temperature If a PCB s tem perature exceeds 70 C the thermal sensor shuts down the over heated card Rev 0 10 Switch Installation and Basic Operation 20 Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Ma
4. of the switch is a simple process requiring attention to the normal mechanical power and thermal precautions for rack mounted equipment The switch does not require any programming or configuration to begin operation in an InfiniBand fabric using standard compliant Subnet Management software The following steps provide a basic overview of the installation process 1 Physical Installation Section 2 2 1 Power Connections Section 2 2 2 InfiniBand Copper Cable Installation Section 2 2 3 Switch Power Up Section 2 2 4 InfiniBand Fabric Initialization and Management Section 2 2 5 Hot Swap Extraction Insertion of Leaf and Spine Boards Section 2 2 6 Hot Swap Extraction Insertion of Power Modules Section 2 2 9 2 2 oe oe Hot Swap Extraction Insertion of Fan Module Section 2 2 10 2 2 1 Physical Installation Warning This equipment is very heavy and should be carried by at least four people to avoid back and or other bodily injuries The switch uses 14 5U of rackspace in a standard 19 rack As shown in Figure 1 Switch Views the switch ships from the factory with the mounting racks on the front side In addition to the mounting rails the switch requires sup port underneath the unit to support the un mounted side in this case the rear side Please make sure to choose a rack which is able to support the mechanical and environmental characteristics of a fully populated switch chassis as listed in Table 3 S
5. R DDR InfiniBand Switch Platform User s Manual About this Manual This manual provides an overview of the 14 5U Chassis 4X InfiniBand Switch Platform and guidelines for its opera tion Intended Audience This manual is intended for users and system administrators responsible for installing and setting up the switch plat form The manual assumes familiarity with the InfiniBand architecture specification Related Documentation The documentation set accompanying the 14 5U 4X InfiniBand Switch platform includes the following Table 1 Reference Documents and Web Sites Switch Firmware and Firmware Update Tools See http www mellanox com under Firmware downloads Note that the Switch System described in this manuakis based on Mellanox Technolo gies MT47396 InfiniScale III switch device InfiniBand Administration IBADM Tools User s Manual Document no 2130UM Mellanox Technologies document Describes the installation and use of IBADM tools for management and firmware updates of platforms based on Mellanox Technologies Infini Band devices Available from http Awww mellanox com under Management Tools IB Switch Platforms Embedded Management Tools Document no 2141UM Describes the Embedded Management Tools EMGT package which pro vides Qut of Band management capabilities for InfiniBand switches Available from http docs mellanox com requires a Mellanox Technolo gies customer acc
6. SU l 2 3 Disconnect the AC cord Press up the black latch at the bottom of the PSU and simultaneously pull PSU handle See Figure 6 a Slide out the PSU completely See Figure 6 b Figure 6 PSU Extraction a Releasing the PSU b Sliding out the PSU 2 2 9 2 Inserting a PSU l 2 J Insert the PSU by sliding it into the PSU slot until it seats completely Make sure the black latch pops out Connect the AC cord Make sure the green AC OK and DC OK LEDs should turn on 2 2 10 Hot Swap Replacement of Fan Modules There are three fan modules on the switch One Leaf fan module and two Spine fan modules The Leaf fan module of the switch platform is located in the center of the front and includes six fans See Figure 7 on page 18 Rev 0 10 Switch Installation and Basic Operation 18 One Spine fan module is located on the left side beneath Spines 1 and 2 and the other module on the right side beneath Spines 3 and 4 Each such module includes two fans Each of the fan modules above has a dedicated green LED per fan that lights steady green as long as the fan rotates If the LED turns off this indicates that the fan has stopped and the system temperature may rise in this case the fan module should be replaced as soon as possible 2 2 10 1 Extracting the Leaf Fan Module 1 Unscrew the four captive screws that hold the Leaf fan module to the chassis See Figure 7 a 2 Slowly slide out the fan module while
7. d Switch Views Fan Module 12 port Leafs Spines Blank Leaf AC Inlets VY 1 4X IB SDR ports transfer data at 10Gb s and 4X IB DDR ports transfer data at 20Gb s Rev 0 10 Overview 8 Part Number F XR430084 1 1 Ordering Information Table 4 List of Part Numbers and Switch Product Descriptions Description 288 Modular InfiniBand DDR Switch in a 288 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device F XR430085 288 Modular InfiniBand DDR Switch in a 276 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device F XR430086 F XR430087 F XR430088 F XR430089 F XR430090 288 Modular InfiniBand DDR Switch in a 264 Port 4X Configuration 14 5U Chassis Based on the InfiniScale II Device 288 Modular InfiniBand DDR Switch in a 252 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch in a 240 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch in a 228 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288Modular InfiniBand DDR Switch in a 216 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device F XR430091 288 Modular InfiniBand DDR Switch in a 204 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device F XR430092 288 Modular InfiniBand DDR Switch in a 192 Port 4X Configuration 14 5U Chass
8. d leaf slots to maintain balanced air flow Also mounting screws should all be tightened 2 2 4 1 Power Supply and Spine Board Indicator Status at Power ON As the power is turned on you should observe the following conditions for normal operation 1 Power Supply Unit s AC OK and DC OK indicators are ON and Alarm indicator is OFF 2 All LED indicators on the Spine and Leaf Boards light up briefly and then turn off 3 Spine Board indicators will display status of internal links to the installed Leaf Boards All PHY links to present Leaf Boards should be ON 4 There is a green Status LED that indicates per Spine board and per Leaf board that all its power supplies are good Make sure that all are on 5 There is a yellow Status LED per Leaf board and per Spine board For a Leaf board it should always be off For a Spine board it is on in case one of its power supplies are faulty Make sure they are all off 6 For Spine boards only There is a yellow System Fail LED that will light to indicate one of the following failure situations a fan failure over temperature or a main AC power supply failure On power on this LED will blink for several seconds and then turn off if none of the above situations has occurred 7 There is a blue LED per Spine board and per Leaf board It should be off forall boards The Spine Board has two sets of indicators One shows which Leaf Boards are present The second set shows the internal link status to th
9. dth CBB Fat Tree topology that the Subnet Manager will discover and configure to enable a full cluster to operate For more information refer to the documentation of the Subnet Manager being used 2 2 6 Hot Swap Extraction Insertion of Leaf Boards Switch Leafs are located on the back of the system Each switch Leaf board has a pair of ejectors that lock the board in place and serve as a lever for seating or extracting see Figure 4 The eyectors snap inward to lock the board into 1 2 88 Tbit sec when IB ports are in SDR mode Rev 0 10 Switch Installation and Basic Operation 14 place and include a red button to disengage the lock and electrically notify the system that an extraction has been requested 2 2 6 1 Extracting a Leaf Board l 2 Disconnect all cables connected to the Leaf board Unscrew the retaining screws on the outside of the connectors These Figure 3 Retaining Screw and Red Button screws are captive and will remain hanging in place See Figure 3 Press the red buttons to unlock the eyectors See Figure 4 a Press the ejyectors outward so that the board pops out then slowly Retaining slide the board out Note that the board is short therefore do not let aerei go of it while sliding it out See Figure 4 b Red Note The Leaf board does not have a base plate thus the print side Button components are exposed Please handle the board carefully Figure 4 Leaf Board Extraction a Pr
10. e Leaf Boards The green PHYSICAL LINK LED indicators on the Spine and Leaf Boards will indicate the state representing the link status of their corresponding ports The green PHY LED is steady ON to indicate the physical link is up It blinks to indicate a physical link error The yellow LOGICAL LINK LED indicates the logical link is active and will turn ON only when the link is enabled by subnet management software in the Infini Band subnet It blinks during activities and the blinking rate is proportional to traffic rate 2 2 5 InfiniBand Fabric Initialization and Management Subnet Management and Subnet Administration are standard components defined by the InfiniBand Specification which implement fabric initialization discovery and configuration The switch s switching fabric can be managed by any third party Subnet Management software running on an InfiniBand Host that is connected to any switch port The switch is also compatible with the Open Source Subnet Manager OpenSM The switch is basically an InfiniBand fabric built out of individual InfiniBand switch devices and appears so to exter nal Subnet Managers The switch supports the SystemImage GUID feature of the InfiniBand specification which means that software management tools that support this feature can recognize all the internal devices as a single switch system A fully populated 288 4X port system features up to 5 76 Tbit sec IB ports in DDR mode Constant Bisectional Bandwi
11. en slide out the Spine board See Figure 5 c Hold the board with one hand supporting its bottom and the other grasping its middle Then slide the board all the way out Note not to damage the GBX connectors on the board and or the EMI gasket of the spine slot in the System Figure 5 Spine Board Extraction a Step 2 of Spine Extraction b Step 3 of Spine Extraction c Step 4 of Spine Extraction Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 2 2 8 Inserting a Spine Board l 2 3 Hold the Spine board with one hand supporting its bottom and the other grasping its middle Insert the board into its rail The board should slide in without resistance Once the board is about half way inside its rail hold the spine ejectors and push the board in until it cannot move Make sure the spine ejectors are open all the way 90 degrees Now press both ejectors inward simultaneously You should feel the ejectors are hooked into the front panel Press both ejectors applying some force to close them completely Screw in the captive retaining screws of the two ejectors to lock the Spine board in place 2 2 9 Hot Swap Extraction Insertion Power Supply Modules A PSU Power Supply Unit in a redundant configuration third or fourth PSU can be extracted without bringing down the system A PSU should not be extracted with the system on if the system is not in redundant configuration 2 2 9 1 Extracting a P
12. essing the red buttons unlocks the ejectors b Sliding out the Leaf board 2 2 6 2 Inserting a Leaf Board l Verify the ejectors are unlocked by pressing the red buttons and pulling the ejectors outward on both sides of the board slot Carefully seat the Leaf board into the side guide rails and slowly slide the board into the chassis until the ejectors begin to engage on the chassis edge Press the ejectors inward until the locks snap This indicates that the board is fully seated Screw in the captive retaining screws on the outside of each ejector to lock the Leaf board in place Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual Note The Leaf board does not have a base plate thus the print side components are exposed Please handle the board carefully Rev 0 10 Switch Installation and Basic Operation 16 2 2 7 Hot Swap Extraction Insertion of Spine Boards Each switch Spine board has a pair of ejectors that lock the board in place and serve as levers for seating or extracting see Figure 5 2 2 7 1 Extracting a Spine Board l 2 3 Disconnect all cables connected to the spine Unscrew both top and bottom retaining screws of the spine See Figure 5 a Hold the spine ejectors and press both of them outward simultaneously Expect some resistance before the board pops out See Figure 5 b Pull the ejectors out till they form 90 degrees with the panel of the system th
13. iScale HI Device 288 Modular InfiniBand DDR Switch in a 48 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device F XR430105 288 Modular InfiniBand DDR Switch in a 36 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device F XR430106 F XR430107 288 Modular InfiniBand DDR Switch in a 24 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch in a 12 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 2 Switch Installation and Basic Operation 2 1 Installation Safety Warnings 1 Installation Instructions Read all installation instructions before connecting the equipment to the power source 2 Bodily Injury Due to Weight This equipment is very heavy and should be carried by at least four people to avoid back and or other bodily injuries 3 Over temperature This equipment should not be operated in an area with an ambient temperature exceeding the maximum recommended 55 C 131 F Moreover to guarantee proper air flow allow at least 8cm 3 inches of clearance around the ventilation openings 4 Stacking the Chassis The chassis should not be stacked on any other equipment If the chassis falls it can cause bodily injury and equipment damage 5 During Lightning Electrical Hazard During periods of lightning
14. is Based on the InfiniScale II Device F XR430093 288 Modular InfiniBand DDR Switch in a 180 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device F XR430094 288 Modular InfiniBand DDR Switch in a 168 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device F XR430095 288 Modular InfiniBand DDR Switch in a 156 Port 4X Configuration 14 5U Chassis Based on the InfiniScale II Device F XR430096 288 Modular InfiniBand DDR Switch in a 144 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device F XR430097 F XR430098 F XR430099 F XR430100 F XR430101 F XR430102 F XR430103 F XR430104 288 Modular InfiniBand DDR Switch in a 132 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device 288 Modular InfiniBand DDR Switch in a 120 Port 4X Configuration 14 5U Chassis Based on the InfiniScale III Device 288 Modular InfiniBand DDR Switch in a 108 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch in a 96 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch in a 84 Port 4X Configuration 14 5U Chassis Based on the InfiniScale HI Device 288 Modular InfiniBand DDR Switch ina 72 Port 4X Configuration 14 5U Chassis Based on the InfiniScale I Device 288 Modular InfiniBand DDR Switch in a 60 Port 4X Configuration 14 5U Chassis Based on the Infin
15. le vendor To remove disengage the lock and slowly pull the connector away from the port recep tacle Table 5 is a decoder of the ports yellow and green LEDs states Table 5 Port LEDs Decoder Table Port Green LED State Port Yellow LED State Description ON steady OFF Physical link connection of port is established but the logical link connection is not ON steady ON Steady Both the physical and logical link connections of port are established Blinking Physical link error ON Steady piinkine Transfer activity is on going Blinking rate is proportional to traffic rate OFF OFF Cable is unseated unconnected Note The switch does not provide a visual means that indicates the port speed configuration SDR or DDR and or the link width 1X or 4X The speed and link width configurations can be retrieved using software Warning Take care to not impede the air exhaust flow through the ventilation next to the InfiniBand ports Use cable lengths which allow routing horizontally around to the side of the chassis before bend ing upward or downward in the rack Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 2 2 4 Switch Power Up Check all boards power supply and fan tray modules for proper insertion and seating before connecting the AC power cords read Section 2 2 6 through Section 2 2 7 to ensure all modules are properly installed Insert thermal blanks in unuse
16. nual 21 3 Switch Management Tools This chapter describes e In Band management of the switch system using the IBADM package Section 3 1 e Out of Band management of the switch system via Embedded Management Tools Section 3 2 3 1 IBADM Features Maintenance and configuration of the switch is done in band through the InfiniBand fabric using the Mellanox Infini Band Administration IBADM tools package see Related Documentation on page 5 This package provides the ability to make firmware upgrades and monitor the temperature voltage port utilization and other status parameters in the switch The IBADM tools enable the system administrator to manage one or more switches from a single remote InfiniBand host The features include the following e Full In Band Management of multiple switch systems and Mellanox HCA Systems from a single host e Simple default configuration to get started quickly e Name based subnet browsing and topology verification e Event monitoring of port statistics link status and system status for all ports in the switch e Checking and updating the firmware e Intuitive Command Line Interfaces e Extensible and customizable via common seripting languages Note IBADM provides no baseboard management capabilities Figure 9 shows the default configuration model for these tools Figure 9 Default Configuration Model Switch System Switch Administration Components HCA Driver IBADM Tool
17. ols User s Manual Rev 0 10
18. ount Rev 0 10 6 Revision History Table 2 Revision History of this User s Manual Revision 0 10 Date July 2007 First release Details Rev 0 10 14 5U 4X SDR DDR InfiniBand Switch Platform User s Manual 1 Overview This User s Manual provides an overview of the 14 5U 4X SDR DDR Modular InfiniBand Switch Platform the switch and the operational environment The switch is based on Mellanox Technologies MT47396 InfiniScale III switch device Table 3 Switch Rack Mechanical and Environmental Requirements Fully Populated Chassis Rack Height Rack Width a a Weight Max Power 288 4X Ports Ambient Temp 14 5U 19 EIA 310 23 6 195 Ib 1900 W 220 VAC Max 55 C 644mm 600mm 88 1 kg Up to four Power Supplies of 100 240VAC Min 0 C 50 60Hz 13 6 3A This User 5s Manual includes the following chapters This Overview chapter Switch Installation and Basic Operation page 9 Switch Management Tools page 21 Mechanical Drawings Appendix page 23 The switch ships in a minimum base configuration plus additional modules depending on the chosen customer con figuration Optional modules include Leaf boards a redundant management capability of Spine boards and redun dant power supply units Figure 1 Switch Views shows the various hardware components required for installation Figure
19. s iC j Subn InfiniBand HCA Rev 0 10 Switch Management Tools 22 3 1 1 IBADM Requirements The general requirements for installing the IBADM software are listed below Please see the IBADM release notes for details on platform OS Driver and Subnet Management support 1 Computer Platform with any Mellanox Technologies host channel adapter HCA card installed 2 HCA Driver 3 InfiniBand compliant Subnet Management The Open source Subnet Manager OpenSM is recommended 3 1 2 How to Get IBADM The IBADM tool and documentation are available for download via http www mellanox com See Related Docu mentation on page 5 3 2 Embedded Management Tools Embedded Management Tools are based on the I2C interface of the switch system These tools can be run from the embedded Power PC CPU card installed in the switch or from the Linux host PC via a USB to I2C adapter an MTUSB x device available from Mellanox These tools enable basic chassis management functions such as e monitoring temperature voltages power supplies and fans e querying for board serial numbers and their revisions In addition the tools enable firmware management capabilities suchas e querying for existing firmware versions e burning new firmware from scratch or for recovery from damaged firmware e querying for and changing system GUIDs e checking for duplicate or bad GUIDs For further details see Embedded Management To
20. uppl disconnects only one ower supply module o isolote the unit Figure 2 Four Power Inlets Electric Caution Notification completely disconnect all power supplies bafahe des elektrischen chocks Entfernen des Netzsteckers eines Netzteils soannurngstrel Um alle Einheiten spannungstrel Zu machen sing die Netzstecker aller Netzteile ZU entfernen ATTENTION Risque de choc et de danger electriques Le de branchement dune seule alimentation stabilise e ne debranche uniquement qu un module Alimentation Stabilise e Pour isoler completement le nodule er couse Il fout de brancher toutes les alimentations stobilise es ACHTUNG 2 2 3 InfiniBand Copper Cable Installation The switch uses industry standard 4X CX4 InfiniBand copper cables which are available from several vendors The standard 4X cables support full 20 20Gb s DDR and 10 10Gb s SDR bidirectional wire speed of the switch ports All InfiniBand 4X connections are made to the Leaf Boards Each Leaf has 12 InfiniBand 4X copper connec tors which are numbered 1 12 from left to right All cables can be inserted or removed with the unit powered on Toansert a cable press the connector onto the port receptacle until the connector is firmly seated The green LED indicator to the right of the port will light when the physical connection is established when unit is powered on Then lock the connector using the latching mechanism particular to the cab
21. witch Rack Mechanical and Environmental Requirements Fully Pop ulated Chassis Note A 15U mounting space is required for proper installation of the switch platform The rack mounting holes conform to the IEA 310 standard for 19 inch racks Take precautions to guar antee proper ventilation to ensure air intake at the front of the chassis and exhaust in the rear this is cru cial for maintaining good airflow at ambient temperature In particular route cables such that they do not impede the air exhaust from the chassis 2 2 2 Power Connections The switch includes integrated hot swap power supplies which support up to four load sharing 1000W supply units The slots for the four power supply units PSUs are on the front panel and are labelled PS 1 4 Each PSU has a dedi cated AC inlet This design enables the optional use of separate main and backup AC feeds The input voltage is Autorange 100 240 VAC 50Hz or 60Hz The power cords should be standard 3 wire AC power cords including a safety ground The switch system requires at least two PSUs to operate a fully populated platform The third PSU provides a failover protection mechanism such that the system will continue operating if one PSU fails Connecting the third and fourth PSUs to a different AC line provides AC failover protection Rev 0 10 Switch Installation and Basic Operation 12 CAUTION RISK of electric shock and energy hazard Tisconmectiig ane power s
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