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3Com Hub 1000 SX manual control. See also asymmetric ﬂow control, ﬂow control, pause frame

Models: Hub 1000 SX

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4GLOSSARY

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.

symmetric A relationship between linked network devices in which both devices ﬂow control can send and receive pause frames. Also called bidirectional ﬂow

control. See also asymmetric ﬂow control, ﬂow control, pause frame.

twisted-pairWiring similar to that found in the telephone system, consisting of two insulated wires loosely twisted around each other to help cancel out induced noise in balanced circuits.

UTP Unshielded twisted-pair. A cable consisting of two or more pairs of twisted copper wires that are not shielded.

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3Com Hub 1000 SX manual control. See also asymmetric ﬂow control, ﬂow control, pause frame

Contents

User Guide SuperStack II Hub 1000 SXA member of the 3Com SuperStack II System 3Com Corporation 5400 Bayfront Plaza Santa Clara, California UNITED STATES GOVERNMENT LEGENDS2 INSTALLING THE HUB CONTENTSABOUT THIS GUIDE 1 INTRODUCTION 3 MAKING CONNECTIONS A USING THE CONSOLE PORTPOST Messages SPECIFICATIONS GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTYTECHNICAL SUPPORT FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page TABLES Port Conﬁguration MenuPage ABOUT THIS GUIDE IconNotice Type DescriptionCommands SETDEFAULT !0 -IP NETaddr =Menu commands and buttonsHub 1000 SX INTRODUCTIONGeneral Description Downlinks and UplinkFull-Duplex OperationFlow Control Features and FunctionsINSTALLING THE HUB SuperStack II Hub 1000 SX User GuideHub Description The hub’s front and rear panels are shown in Figure Installing and Connecting the Hub4 Repeat steps 2 and 3 for the other side of the hub Connector Table 2-1 Downlink ConnectionsMaximum Cable TypeTable 2-2 Hub 1000 SX Indicators IndicatorColor StatusConnecting a GBIC ModuleInstalling and The gigabit interface connector GBIC port on the rear panel of theUsing Optional Power SystemsPower Modules Cabling OptionsA hub connects to a UPS unit through the hub’s AC power cord Table 2-4 Advanced RPS Conﬁguration OptionsYou 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 Page MAKING CONNECTIONS Table 3-1 Gigabit Ethernet Maximum Cable LengthsPower Workgroup AggregatingServers Connecting aSwitches The Hub 1000 SX does not support bandwidth aggregation trunkingAggregating You can use the Hub 1000 SX downlinks to aggregate 10/100 MbpsFigure 3-3 Aggregated Switches Connection 3-4 CHAPTER 3 MAKING CONNECTIONSFigure 3-4 Mixed Connection ConnectingThe best use of the hub uplink is as a backbone connection to a 3Com Figure 3-6 Uplink Connection to a 10/100 Mbps Switch Table 3-2 Troubleshooting TipsSymptom SolutionUSING THE CONSOLE PORT Connecting the With PowerRequirements Console Portfrom power With PowerTo connect the console port when the hub is disconnected Connecting the Console Port A-3message, return the hub to the supplier Logging OnAfter 4 minutes of inactivity, the CLI logs off automatically Password Port SettingsChanging the ConﬁguringTo display the Port Conﬁguration menu Configuring Port Settings Table A-2 Port Conﬁguration MenuA-8 APPENDIX A USING THE CONSOLE PORT Configuring Port Settings and be conﬁgured to receive pause frames Configuring Port Settings A-11 Displaying Hub Statusmatrix, Y indicates yes and n indicates no. See Table A-3 Table A-3 Hub Status InformationDisplaying Hub Status A-13 Restoring the Factory Default Settings A-14 APPENDIX A USING THE CONSOLE PORTUpdating the Firmware Imageentering option Checking theXmodem-CRC To transfer the ﬁrmware image ﬁle Logging Off during a ﬁrmware update, the CLI displays the following messagelog in again. To restart the ﬁle transfer, repeat steps 6 and Table A-5 Fatal Error Messages Table A-4 File Transfer Error MessagesWhile saving port settings or Physical Dimensions SPECIFICATIONSEnvironmental Operating Ranges Page Services Board ServiceTECHNICAL SUPPORT Online TechnicalAccess by Analog Modem Access by Digital Modem1 408 654 C-2 APPENDIX C TECHNICAL SUPPORTLocal access numbers are available within the following countries Santa Clara, California Czech Republic/SlovakCentral European HQ 305 261 3266 Miami, FloridaTo obtain an RMA number, call or fax Page GLOSSARY Carrier Sense Multiple Access/Collision Detection. Channel access delay their retransmissions for a random length of timecable is based on CSMA/CD Carrier Sense Multiple Access/Collision access methodIEEE incomingﬂow control Mbpscontrol. See also asymmetric ﬂow control, ﬂow control, pause frame INDEX SymbolsNumbers Page Switch 9300 3-2, 3-3 Page 3Com Corporation LIMITED WARRANTY STANDARD WARRANTY SERVICEHARDWARE SOFTWARELIMITATION OF LIABILITY FCC CLASS A VERIFICATION STATEMENTGOVERNING LAW