® SuperStack® II Hub 1000 SX User Guide A member of the 3Com SuperStack II System http://www.3com.com/ Part No.
3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 Copyright © 1998, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.
CONTENTS ABOUT THIS GUIDE 1 INTRODUCTION Hub 1000 SX General Description 1-1 Downlinks and Uplink 1-2 Full-Duplex Operation 1-2 Flow Control 1-2 Asymmetric Flow Control 1-3 Symmetric Flow Control 1-3 Auto-Negotiation 1-3 Forced Link 1-3 Features and Functions 1-4 2 INSTALLING THE HUB Safety Precautions 2-1 Package Contents 2-1 Hub Description 2-2 Front Panel 2-2 Rear Panel 2-3 Preparing the Site 2-3 Installing and Connecting the Hub 2-3 Mounting in a Rack 2-3 Placing on a Desktop 2-5 Interpreting Hub In
3 MAKING CONNECTIONS Aggregating Servers 3-2 Connecting a Power Workgroup Aggregating Switches 3-3 Mixing Connections 3-4 Connecting Through the Uplink Troubleshooting 3-6 A 3-2 3-5 USING THE CONSOLE PORT Requirements A-2 Connecting the Console Port A-2 With Power Connected A-2 With Power Disconnected A-3 POST Messages A-3 Logging On A-4 Changing the Password A-5 Configuring Port Settings A-5 Disabling Ports A-7 Disabling Auto-Negotiation A-8 Configuring the Uplink for Asymmetric Flow Control Displayin
B SPECIFICATIONS C TECHNICAL SUPPORT Online Technical Services C-1 World Wide Web Site C-1 3Com Bulletin Board Service C-1 Access by Analog Modem C-2 Access by Digital Modem C-2 3ComFacts Automated Fax Service C-2 3ComForum on CompuServe Online Service Support from Your Network Supplier C-3 Support from 3Com C-4 Returning Products for Repair C-5 C-3 GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENT v
FIGURES 2-1 2-2 2-3 2-4 Hub 1000 SX Front and Rear Panels 2-2 Attaching a Bracket for Rack Mounting 2-4 Rack Mounting the Hub 2-4 Sample GBIC Module 2-7 3-1 3-2 3-3 3-4 3-5 3-6 Server Farm Connection 3-2 Power Workgroup Connection 3-3 Aggregated Switches Connection 3-4 Mixed Connection 3-5 Connection to Another Hub 1000 SX 3-5 Uplink Connection to a 10/100 Mbps Switch A-1 Console Port 3-6 A-1 vii
TABLES 1 2 Notice Icons 1 Text Conventions 2 2-1 2-2 2-3 2-4 Downlink Connections 2-5 Hub 1000 SX Indicators 2-6 GBIC Modules 2-7 Advanced RPS Configuration Options 3-1 3-2 Gigabit Ethernet Maximum Cable Lengths Troubleshooting Tips 3-6 A-1 A-2 A-3 A-4 A-5 Situations That Require Configuring Port Settings Port Configuration Menu A-7 Hub Status Information A-12 File Transfer Error Messages A-18 Fatal Error Messages A-18 2-10 3-1 A-5 ix
ABOUT THIS GUIDE This guide contains installation procedures and technical information about the 3Com® SuperStack® II Hub 1000 SX Gigabit Ethernet full-duplex repeater (part number 3C510-SX). It is assumed that the user knows basic precautions and procedures for working with electrical equipment and has experience installing, using, and managing an Ethernet network. It is also assumed that the user has some knowledge of repeater technology.
2 ABOUT THIS GUIDE Table 2 Text Conventions Convention Description Screen displays This typeface represents information as it appears on the screen. Commands The word “command” means you must enter the command exactly as shown in text and press Return or Enter. For example: To remove the IP address, enter the following command: SETDEFAULT !0 -IP NETaddr = 0.0.0.0 This guide always gives the full form of a command in uppercase and lowercase letters.
1 INTRODUCTION Gigabit Ethernet technology allows signal transmission at the rate of one gigabit per second (1 Gbps, or 1000 Mbps), while continuing to support IEEE 802.3 CSMA/CD local area networks. Using this technology, you can add gigabit bandwidth to critical areas of a network and fully leverage investments in Ethernet and Fast Ethernet products.
1-2 CHAPTER 1: INTRODUCTION Downlinks and Uplink The hub’s eight 1000BASE-SX full-duplex downlink ports (downlinks) can connect to servers or clients that are equipped with Gigabit Ethernet network interface cards (NICs) or to 10/100 Mbps switches that are equipped with Gigabit Ethernet uplink devices. One uplink port (uplink) accepts an optional gigabit interface connector (GBIC) module.
Flow Control 1-3 When the receiver’s input buffers can store packets again, it can either send another pause frame to tell the transmitter to resume transmission, or wait for transmission to resume. If the Hub 100 SX receives a pause frame, it does not remove the frame from the network. Instead, it corrupts the frame’s CRC field and retransmits the frame to all other ports.
1-4 CHAPTER 1: INTRODUCTION Features and Functions The hub can be mounted in a 19-inch standard rack or placed on a flat surface. It supports the 1000 Mbps media access control (MAC) as specified in the IEEE 802.3z standard. In addition, the hub has these features: ■ LED indicators report the status of each port and of hub operations. A meter shows the percentage of bandwidth being used within the hub.
2 INSTALLING THE HUB This chapter describes the Hub 1000 SX package contents and provides installation procedures for the hub and for optional GBIC modules and power systems. No configuration is required to install and use the hub. Safety Precautions To avoid personal injury or damage to the Hub 1000 SX unit, observe the following safety precautions: WARNING: Do not perform any maintenance on the hub while it is still connected to a power source.
2-2 CHAPTER 2: INSTALLING THE HUB If you need to return the hub to 3Com, pack it in the original (or equivalent) packing material to maintain the warranty. If you ordered a GBIC module or optional power system, it is packaged separately from the hub. Hub Description The hub’s front and rear panels are shown in Figure 2-1.
Preparing the Site Rear Panel 2-3 The AC input socket accepts a 100–240 V AC power cord. Power can be supplied through optional 3Com SuperStack II Advanced Redundant Power System (Advanced RPS) and SuperStack II Uninterruptible Power System (UPS) units. These units use the DC power connector. See “Using Optional Power Systems” later in this chapter. The console port, a DB-9 standard male connector, can connect to a PC through a null modem cable. For information on the console functions, see Appendix A.
2-4 CHAPTER 2: INSTALLING THE HUB . ® Figure 2-2 Attaching a Bracket for Rack Mounting 3 Insert the two screws and tighten with a screwdriver. Do not overtighten the screws. 4 Repeat steps 2 and 3 for the other side of the hub. 5 Mount the hub in the rack and secure it with suitable screws, as shown in Figure 2-3.
Interpreting Hub Indicators 2-5 Table 2-1 Downlink Connections Connector Type Cable Type SC Short-wavelength (850 nm) fiber-optic: Maximum Cable Length (Meters) 62.5/125 µ MMF 260 50/125 µ MMF 550 7 Apply power to the hub in either of these ways: Placing on a Desktop Interpreting Hub Indicators ■ Plug one end of the power cord into the AC input socket and the other end into a power source.
2-6 CHAPTER 2: INSTALLING THE HUB Table 2-2 Hub 1000 SX Indicators 100 50 SUPER STACK PORT STATUS ACTIVITY OVERTEMP RPS ON UNIT STATUS LINK PWR RPS FAIL PAUSE 1 2 3 4 5 6 7 8 9 SuperStack II HUB 1000 SX 10 % BW USAGE Indicator Color Status Meaning % BW usage meter Green Fluctuating The meter indicates the percentage of bandwidth that the hub is using. Because the hub can be connected to multiple network segments, this meter represents the aggregate load on the hub.
Installing and Connecting a GBIC Module Installing and Connecting a GBIC Module 2-7 The gigabit interface connector (GBIC) port on the rear panel of the Hub 1000 SX chassis accepts an optional 3Com GBIC module that permits connection to a Gigabit Ethernet device. GBIC modules must be ordered separately in either single-packs or six-packs. By inserting the appropriate GBIC module in the hub’s rear-panel uplink port, you can use various types of cabling to connect the hub to LAN devices.
2-8 CHAPTER 2: INSTALLING THE HUB To install and connect a GBIC module, follow these steps: 1 Disconnect all power to the Hub 1000 SX. Disconnect the AC power cord. If you are using an Advanced RPS unit, disconnect the RPS cable from the DC power connector. 2 Remove the GBIC module from its shipping container. 3 Slowly insert the module into the rear-panel uplink port, being careful not to damage any of the components or connecting pins. The module slides into the hub following the tracks in the slot.
Using Optional Power Systems 2-9 Power Modules At least one SuperStack II Advanced Redundant Power System Power Module Type 2 is required for each SuperStack II hub that you want to protect. The Hub 1000 SX requires the 100-watt, 3.3-volt version of the module (part number 3C16074). One Advanced RPS with Power Modules configured with straight cables for standard usage can contain a maximum of four 100-watt Power Modules (and four 60-watt Power Modules), or eight 60-watt Power Modules.
2-10 CHAPTER 2: INSTALLING THE HUB Table 2-4 Advanced RPS Configuration Options Option Connection Description Standard usage Disconnect the hub’s AC power cable from the AC outlet. Use the straight DC cable supplied with the Power Module to connect the Power Module directly to the hub through the DC power connector located on the hub’s rear panel. (See “Rear Panel” in this chapter.) The hub obtains DC power from a single Power Module instead of being powered directly from a standard AC source.
Using Optional Power Systems 2-11 You can connect a UPS unit to an Advanced RPS unit as long as you do not exceed the maximum wattage (325 watts) for the UPS unit. To verify that the UPS unit’s maximum wattage is not exceeded, calculate the total power consumption of all units connected to the Advanced RPS. If the result is less than 325 watts, your configuration is safe; if the result is greater than 325 watts, then there are too many units connected to the Advanced RPS.
MAKING CONNECTIONS 3 This chapter contains guidelines for making typical Hub 1000 SX network connections and for troubleshooting problems with the hub. When making hub connections, follow the rules for maximum cable lengths, which are summarized in Table 3-1. If you connect 10/100 Mbps devices to the network, rules for Ethernet and Fast Ethernet connections also apply. Table 3-1 Gigabit Ethernet Maximum Cable Lengths Cable Type Laser Wavelength Connector Type 50/125 µ Multimode Fiber 62.
3-2 CHAPTER 3: MAKING CONNECTIONS Aggregating Servers You can use the Hub 1000 SX downlinks to aggregate servers into server farms. First, install 3Com 3C985-SX Gigabit EtherLink® Server NICs in each server. Then, connect up to eight servers through the downlinks. The hub’s optional gigabit interface connector (GBIC) uplink can connect to a 3Com SuperStack II Switch 9300 Gigabit Ethernet switch, thereby connecting to the network backbone. See Figure 3-1.
Aggregating Switches 3-3 SuperStack II Switch 9300 SUPER STACK SuperStack II 9300 SX ® Single-mode fiber-optic cable Maximum distance: 3 km SuperStack II Hub 1000 SX SUPER STACK ® SuperStack II 1000 SX 62.
3-4 CHAPTER 3: MAKING CONNECTIONS SuperStack II Switch 9300 SUPER STACK Single-mode fiber-optic cable Maximum distance: 3 km ® SuperStack II 9300 SX SuperStack II Hub 1000 SX SUPER STACK ® SuperStack II 1000 SX 62.
Connecting Through the Uplink 3-5 SuperStack II Switch 9300 SUPER STACK Single-mode fiber-optic cable Maximum distance: 3 km ® SuperStack II 9300 SX SuperStack II Hub 1000 SX SUPER STACK ® SuperStack II 1000 SX Servers with 3C985-SX Gigabit EtherLink Server NICs 62.
3-6 CHAPTER 3: MAKING CONNECTIONS The Hub 1000 SX itself can be used as the network backbone by connecting the uplink to a server equipped with a 3C985-SX Gigabit EtherLink Server NIC or to a 10/100 Mbps switch equipped with a 3C16925 uplink device (see Figure 3-6). For these backbone connections, reconfigure the uplink for asymmetric flow control, as described in “Configuring Port Settings” in Appendix A.
A USING THE CONSOLE PORT The Hub 1000 SX is ready to use and requires no configuration. However, on rare occasions you may need to confirm a POST failure, change a port’s configuration, or update the firmware image to install a bug fix or a standards update. The console port provides access to a simple scrolling command line interface (CLI).
A-2 APPENDIX A: USING THE CONSOLE PORT Requirements To use the console port and CLI, you need: ■ A PC with a serial port ■ A null modem cable ■ A terminal-emulation program If you need to perform a firmware update, the terminal-emulation program must support one of these file transfer protocols: Xmodem, Xmodem-1K, or Xmodem-CRC. Connecting the Console Port With Power Connected It is not necessary to disconnect the hub from the power source to connect the console port.
Connecting the Console Port With Power Disconnected A-3 To connect the console port when the hub is disconnected from power: 1 Connect a null modem cable between the PC serial port and the console port on the Hub 1000 SX rear panel. 2 Turn on the PC. 3 Start the terminal-emulation program. 4 Configure the program with the same settings as the Hub 1000 SX console interface port: ■ 9600 baud ■ 8 data bits ■ 1 stop bit ■ No parity 5 Reconnect the hub to the power supply.
A-4 APPENDIX A: USING THE CONSOLE PORT Hardware Version 0 Bootcode Version 1.00, 02/05/98 Firmware Version 1.00, 02/05/98 **************************************************** * * * SuperStack II (tm) * * Hub 1000 SX * * Copyright (c)1997 3Com Corporation * * * **************************************************** Enter password -> Any POST FAIL message indicates a fatal hardware error. If you see a FAIL message, return the hub to the supplier.
Changing the Password Changing the Password A-5 You can change the password if you need to. The new password must be eight characters or fewer and cannot contain spaces or tabs.
A-6 APPENDIX A: USING THE CONSOLE PORT To display the Port Configuration menu: 1 At the Configuration menu prompt, enter: 1 2 At the next prompt, enter the numbers of the ports that you want to configure. You can specify a single port number, multiple port numbers separated by commas or spaces (for example: 5, 6 7), or a range of port numbers separated with a hyphen (for example: 5-7).
Configuring Port Settings A-7 Table A-2 Port Configuration Menu Option Description (1) Enable port Enable the port for linking. The factory default is all ports enabled. (2) Disable port Disable the port for linking. (3) Enable auto-negotiation Enable auto-negotiation. The factory default is auto-negotiation enabled on all ports. (4) Disable auto-negotiation (force link) Disable auto-negotiation. (5) Show port settings List the current settings for all ports.
A-8 APPENDIX A: USING THE CONSOLE PORT (5) (6) (7) (8) (9) Show port settings Use factory default settings Save new port settings Exit without change to settings Apply changes and exit Selected ports: 3, 5, 6, 7 Enter choice -> 2 **** (1) (2) (3) (4) (5) (6) (7) (8) (9) Port Configuration Menu **** Enable port Disable port Enable Auto-Negotiation Disable Auto-Negotiation (Force link) Show port settings Use factory default settings Save new port settings Exit without change to settings Apply changes and
Configuring Port Settings A-9 *************************************************** ** Hub 1000 Configuration Menu ** *************************************************** [1] Configure port settings [2] Display hub status [3] Update firmware image [4] Change password [5] Logout Enter choice -> 1 Enter port number(s), from 1 to 9: 1 **** (1) (2) (3) (4) (5) (6) (7) (8) (9) Port Configuration Menu **** Enable port Disable port Enable Auto-Negotiation Disable Auto-Negotiation (Force link) Show port settings Us
A-10 APPENDIX A: USING THE CONSOLE PORT Because option 7 has been selected, the settings will persist after a hub reset.
Configuring Port Settings **** (1) (2) (3) (4) (5) (6) (7) (8) (9) Port Configuration Menu **** Enable port Disable port Enable Auto-Negotiation Disable Auto-Negotiation (Force link) Show port settings Use factory default settings Save new port settings Exit without change to settings Apply changes and exit Selected ports: Enter choice -> Enable Outgoing Enable Incoming **** (1) (2) (3) (4) (5) (6) (7) (8) (9) A-11 9 4 Flowcontrol (Y/N)? y Flowcontrol (Y/N)? n Port Configuration Menu **** Enable port
A-12 APPENDIX A: USING THE CONSOLE PORT Displaying Hub Status Hub status includes a matrix of information about the hub ports. In this matrix, Y indicates yes and n indicates no. (See Table A-3.) Table A-3 Hub Status Information Category State Description Port is enabled Y The port is enabled for linking. n The port is disabled for linking. Y A link exists between the port and a device. n No link exists between the port and a device. Y The port is set for auto-negotiation.
Displaying Hub Status A-13 Hub status also includes POST and fan status, bandwidth utilization, hardware and firmware version, and MAC address. The sample hub status display that follows is the result of the changes made in the previous section. To view the hub status, enter: 2 When you have finished viewing the hub status, press Enter to continue the CLI session.
A-14 APPENDIX A: USING THE CONSOLE PORT Restoring the Factory Default Settings To restore port settings to factory defaults: 1 At the Configuration menu prompt, enter: 1 2 Enter the numbers of the ports to be restored to factory defaults. 3 At the Port Configuration menu prompt, enter: 6 4 Apply the changes.
Updating the Firmware Image **** (1) (2) (3) (4) (5) (6) (7) (8) (9) A-15 Port Configuration Menu **** Enable port Disable port Enable Auto-Negotiation Disable Auto-Negotiation (Force link) Show port settings Use factory default settings Save new port settings Exit without change to settings Apply changes and exit Selected ports: 1, 2, 3, 4, 5, 6, 7, 8, 9 Enter choice -> 9 Changes applied If you want settings to persist after a hub reset, enter option 7 before entering option 9.
A-16 APPENDIX A: USING THE CONSOLE PORT Transferring the Firmware Image File Make sure that the terminal-emulation program supports one of the following file transfer protocols: Xmodem, Xmodem-1K, or Xmodem-CRC. To transfer the firmware image file: 1 Obtain the file that contains the firmware image from the 3Com World Wide Web site: http://www.3com.com/ 2 Copy the file to the PC. 3 Connect the console port to the PC. (See “Connecting the Console Port” earlier in this appendix.) 4 Log on.
Logging Off A-17 7 When prompted, enter the filename of the firmware image file. The terminal-emulation program begins to transfer the firmware image file. If you want to stop the file transfer, use the appropriate command in the terminal-emulation program. After the transfer is finished, the CLI displays the following message: File transfer successful. Firmware update successful.
A-18 APPENDIX A: USING THE CONSOLE PORT Table A-5 lists fatal error messages. These messages indicate that the memory unit has failed. If you see a fatal error message, return the unit to the supplier. Table A-4 File Transfer Error Messages Message Meaning Action Xmodem error: Timed out sending NAK. The hub could not send a negative acknowledgment. Xmodem error: Timed out sending ACK. The hub could not send an acknowledgment.
B SPECIFICATIONS This appendix lists the specifications for the SuperStack II Hub 1000 SX. Physical Dimensions Height: 4.37 cm (1.72 in.) Width: 43.94 cm (17.3 in.) Depth: 30.48 cm (12 in.) Weight: 5.
C TECHNICAL SUPPORT 3Com provides easy access to technical support information through a variety of services. This appendix describes these services. Information contained in this appendix is correct at time of publication. For the very latest, we recommend that you access 3Com Corporation’s World Wide Web site.
C-2 APPENDIX C: TECHNICAL SUPPORT Access by Analog Modem To reach the service by modem, set your modem to 8 data bits, no parity, and 1 stop bit.
Support from Your Network Supplier C-3 Local access numbers are available within the following countries: 3ComForum on CompuServe Online Service Country Telephone Number Country Telephone Number Australia 1800 123 853 Netherlands 0800 0228049 Belgium 0800 71279 Norway 800 11062 Denmark 800 17319 Portugal 0505 442 607 Finland 98 001 4444 Russia (Moscow only) 956 0815 France 0800 908158 Spain 900 964 445 Germany 0130 81 80 63 Sweden 020 792954 Italy 1678 99085 U.K.
C-4 APPENDIX C: TECHNICAL SUPPORT Support from 3Com If you are unable to receive support from your network supplier, technical support contracts are available from 3Com. Contact your local 3Com sales office to find your authorized service provider using one of these numbers: Regional Sales Office 3Com Corporation P.O. Box 58145 5400 Bayfront Plaza Santa Clara, California 95052-8145 U.S.A. 3Com Asia Limited Australia Telephone Number 800 NET 3Com Singapore Taiwan, R.O.C.
Returning Products for Repair Returning Products for Repair C-5 Before you send a product directly to 3Com for repair, you must first obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers will be returned to the sender unopened, at the sender’s expense. To obtain an RMA number, call or fax: Country Telephone Number Fax Number U.S.A.
GLOSSARY 10BASE-T 100BASE-T 1000BASE-X The IEEE 802.3 physical layer specification for a 10 Mbps Ethernet network over two pairs of Category 3, 4, or 5 UTP wire. The group of IEEE 802.3 physical layer specifications for a 100 Mbps Ethernet network over various wiring specifications. The group of IEEE 802.3 physical layer specifications for a 1000 Mbps Ethernet network over various wiring specifications. 1000BASE-CX The IEEE 802.
2 GLOSSARY bidirectional flow control See symmetric flow control. CSMA/CD Carrier Sense Multiple Access/Collision Detection. Channel access method used by Ethernet and IEEE 802.3 in which devices transmit only after finding the data channel clear for some period. When two devices transmit simultaneously, a collision occurs and the colliding devices delay their retransmissions for a random length of time.
GLOSSARY IEEE incoming flow control 3 Institute of Electrical and Electronics Engineers. Committees that develop and propose computer standards, such as the 802 protocols, which define the physical and data link protocols of communication networks. Members represent an international cross section of users, vendors, and engineering professionals. The ability of a device to receive pause frames. See symmetric flow control. LAN Local area network.
4 GLOSSARY SC A fiber-optic cable connector. When it is pushed into place, the connector is seated automatically. STP Shielded twisted-pair. Shielded four-conductor electrical cable that offers high-speed transmission for long distances. SuperStack 3Com system of stackable hubs, servers, switches, routers, SDLC converters, and power supplies. SuperStack systems can support a range of LAN environments, including Ethernet, token ring, FDDI, SNA, and ATM.
INDEX Symbols C % BW usage meter 2-6 cables 2-5, 2-7, 2-9, 3-1 calculating power consumption for Advanced RPS 2-11 carrier integrity monitor 1-4 command line interface (CLI) A-1 CompuServe C-3 configuration 1-1, A-1 auto-negotiation 1-3 forced link A-8 configuring port settings A-5 connections console port A-2 downlink 2-5 guidelines 3-1 power workgroup 3-2 uplink 3-5 console interface (CLI) A-1 console port 2-3, A-1 connecting A-2 requirements A-2 conventions notice icons, About This Guide 1 text, Abou
2 INDEX E environmental operating ranges B-1 F factory defaults, restoring port configuration A-14 fax service (3ComFacts) C-2 firmware image, updating A-15 flow control 1-2, A-10 flow control, auto-negotiation 1-3 forced link 1-3, A-8 frames aging 1-4 pause 1-2 front panel 2-2 full redundancy for Advanced RPS 2-10 full resilience 2-10 full-duplex operation 1-2 fuse B-1 indicators at power on 2-5 descriptions 2-6 installation GBIC module 2-8 hub desktop placement 2-5 hub rack mounting 2-3 J jabber cont
INDEX POST description 1-4 diagnostics 2-6 messages A-3 power requirements B-1 systems, optional 2-8 power consumption calculation for Advanced RPS 2-11 Power Modules 2-9, 2-10 power on 2-5 power workgroup 3-2 power-on self-test (POST) description 1-4 diagnostics 2-6 messages A-3 PWR (power) LED 2-6 R rack mounting instructions for 2-3 kit 2-1 rear panel 2-3 reconfiguring ports A-5 redundancy, for Advanced RPS full 2-10 managed 2-10 redundant power system configuration 2-10 requirements console port A-2 p
3Com Corporation LIMITED WARRANTY +5 Limited Warranty The duration of the warranty for the SuperStack II Hub 1000 SX is five (5) years, with the exception of the product’s fans and power supplies, which are warranted for the first year only. Advance hardware replacement will be provided for one (1) year from your date of purchase, in accordance with 3Com’s standard terms and conditions. An extension of the advance replacement coverage is available through the purchase of a service agreement.
LIMITATION OF LIABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF
