3Com Hub 1000 SX manual Glossary

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GLOSSARY

10BASE-TThe IEEE 802.3 physical layer speciﬁcation for a 10 Mbps Ethernet network over two pairs of Category 3, 4, or 5 UTP wire.

100BASE-TThe group of IEEE 802.3 physical layer speciﬁcations for a 100 Mbps Ethernet network over various wiring speciﬁcations.

1000BASE-XThe group of IEEE 802.3 physical layer speciﬁcations for a 1000 Mbps Ethernet network over various wiring speciﬁcations.

1000BASE-CXThe IEEE 802.3 physical layer speciﬁcation for a 1000 Mbps Ethernet network over short-haul shielded balanced copper cable (known as twinaxial STP).

1000BASE-LXThe IEEE 802.3 physical layer speciﬁcation for a 1000 Mbps Ethernet network over long laser wavelength (1300 nm) multimode ﬁber (MMF) or single-mode ﬁber (SMF) cable.

1000BASE-SXThe IEEE 802.3 physical layer speciﬁcation for a 1000 Mbps Ethernet network over short laser wavelength (850 nm) MMF or SMF cable.

Advanced RPS 3Com SuperStack II Advanced Redundant Power System.

asymmetric A relationship between linked network devices in which only one of the ﬂow control devices can receive pause frames. See also ﬂow control, pause frame,

symmetric ﬂow control.

auto-negotiationA method by which linked devices advertise their signaling capabilities (such as protocol, speed, media type, and ﬂow control capabilities) and automatically select their best common mode of communication.

backbone The main transmission medium used to interconnect the workgroup areas of a network. Fiber-optic cable is often used for the backbone connection.

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Contents User Guide SuperStack II Hub 1000 SXA member of the 3Com SuperStack II System UNITED STATES GOVERNMENT LEGENDS 3Com Corporation 5400 Bayfront Plaza Santa Clara, California2 INSTALLING THE HUB CONTENTSABOUT THIS GUIDE 1 INTRODUCTION 3 MAKING CONNECTIONS A USING THE CONSOLE PORTPOST Messages GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY SPECIFICATIONSTECHNICAL SUPPORT FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page Port Conﬁguration Menu TABLESPage Icon ABOUT THIS GUIDENotice Type DescriptionSETDEFAULT !0 -IP NETaddr = CommandsMenu commands and buttonsHub 1000 SX INTRODUCTIONGeneral Description and Uplink DownlinksFull-Duplex OperationFlow Control Functions Features andSuperStack II Hub 1000 SX User Guide INSTALLING THE HUBHub Description The hub’s front and rear panels are shown in Figure Connecting the Hub Installing and4 Repeat steps 2 and 3 for the other side of the hub Table 2-1 Downlink Connections ConnectorMaximum Cable TypeIndicator Table 2-2 Hub 1000 SX IndicatorsColor StatusGBIC Module Connecting aThe gigabit interface connector GBIC port on the rear panel of the Power Systems Using OptionalCabling Options Power ModulesTable 2-4 Advanced RPS Conﬁguration Options A hub connects to a UPS unit through the hub’s AC power cordYou 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 Table 3-1 Gigabit Ethernet Maximum Cable Lengths MAKING CONNECTIONSAggregating Power WorkgroupServers connecting to the network backbone. See FigureThe Hub 1000 SX does not support bandwidth aggregation trunking SwitchesYou can use the Hub 1000 SX downlinks to aggregate 10/100 Mbps 3-4 CHAPTER 3 MAKING CONNECTIONS Figure 3-3 Aggregated Switches ConnectionFigure 3-4 Mixed Connection ConnectingThe best use of the hub uplink is as a backbone connection to a 3Com Table 3-2 Troubleshooting Tips Figure 3-6 Uplink Connection to a 10/100 Mbps SwitchSymptom SolutionUSING THE CONSOLE PORT With Power Connecting theRequirements Console PortTo connect the console port when the hub is disconnected from powerConnecting the Console Port A-3 Disconnectedmessage, return the hub to the supplier Logging OnAfter 4 minutes of inactivity, the CLI logs off automatically Port Settings PasswordChanging the ConﬁguringTo display the Port Conﬁguration menu Table A-2 Port Conﬁguration Menu Configuring Port SettingsA-8 APPENDIX A USING THE CONSOLE PORT Configuring Port Settings and be conﬁgured to receive pause frames Configuring Port Settings A-11 Hub Status Displayingmatrix, Y indicates yes and n indicates no. See Table A-3 Table A-3 Hub Status InformationDisplaying Hub Status A-13 A-14 APPENDIX A USING THE CONSOLE PORT Restoring the Factory Default SettingsFirmware Image Updating theentering 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 Board Service ServicesTECHNICAL SUPPORT Online TechnicalAccess by Digital Modem Access by Analog Modem1 408 654 C-2 APPENDIX C TECHNICAL SUPPORTLocal access numbers are available within the following countries Czech Republic/Slovak Santa Clara, CaliforniaCentral European HQ 305 261 3266 Miami, FloridaTo obtain an RMA number, call or fax Page GLOSSARY cable is based on CSMA/CD Carrier Sense Multiple Access/Collision Carrier Sense Multiple Access/Collision Detection. Channel accessaccess method transmission of light signalsincoming IEEEﬂow control Mbpscontrol. See also asymmetric ﬂow control, ﬂow control, pause frame INDEX SymbolsNumbers Page Switch 9300 3-2, 3-3 Page STANDARD WARRANTY SERVICE 3Com Corporation LIMITED WARRANTYHARDWARE SOFTWARELIMITATION OF LIABILITY FCC CLASS A VERIFICATION STATEMENTGOVERNING LAW