See symmetric ﬂow control, Detection, Csma/Cd | 3Com Hub 1000 SX

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3Com Hub 1000 SX See symmetric ﬂow control, Carrier Sense Multiple Access/Collision Detection. Channel access, Csma/Cd

Contents

A member of the 3Com SuperStack II System SuperStack II Hub 1000 SXUser Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California UNITED STATES GOVERNMENT LEGENDS ABOUT THIS GUIDE 1 INTRODUCTION CONTENTS2 INSTALLING THE HUB POST Messages A USING THE CONSOLE PORT3 MAKING CONNECTIONS TECHNICAL SUPPORT SPECIFICATIONSGLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page TABLES Port Conﬁguration MenuPage Notice Type ABOUT THIS GUIDEIcon Description Menu commands CommandsSETDEFAULT !0 -IP NETaddr = and buttons General Description INTRODUCTIONHub 1000 SX Full-Duplex Downlinksand Uplink Operation Flow Control Features and Functions INSTALLING THE HUB SuperStack II Hub 1000 SX User Guide Hub Description The hub’s front and rear panels are shown in Figure Installing and Connecting the Hub 4 Repeat steps 2 and 3 for the other side of the hub Maximum Cable ConnectorTable 2-1 Downlink Connections Type Color Table 2-2 Hub 1000 SX IndicatorsIndicator Status The gigabit interface connector GBIC port on the rear panel of the Connecting aGBIC Module Using Optional Power Systems Power Modules Cabling Options A hub connects to a UPS unit through the hub’s AC power cord Table 2-4 Advanced RPS Conﬁguration Options 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 Page MAKING CONNECTIONS Table 3-1 Gigabit Ethernet Maximum Cable Lengths Servers Power WorkgroupAggregating connecting to the network backbone. See Figure You can use the Hub 1000 SX downlinks to aggregate 10/100 Mbps SwitchesThe Hub 1000 SX does not support bandwidth aggregation trunking Figure 3-3 Aggregated Switches Connection 3-4 CHAPTER 3 MAKING CONNECTIONS The best use of the hub uplink is as a backbone connection to a 3Com ConnectingFigure 3-4 Mixed Connection Symptom Figure 3-6 Uplink Connection to a 10/100 Mbps SwitchTable 3-2 Troubleshooting Tips Solution USING THE CONSOLE PORT Requirements Connecting theWith Power Console Port Connecting the Console Port A-3 from powerTo connect the console port when the hub is disconnected Disconnected After 4 minutes of inactivity, the CLI logs off automatically Logging Onmessage, return the hub to the supplier Changing the PasswordPort Settings Conﬁguring To display the Port Conﬁguration menu Configuring Port Settings Table A-2 Port Conﬁguration Menu A-8 APPENDIX A USING THE CONSOLE PORT Configuring Port Settings and be conﬁgured to receive pause frames Configuring Port Settings A-11 matrix, Y indicates yes and n indicates no. See Table A-3 DisplayingHub Status Table A-3 Hub Status Information Displaying Hub Status A-13 Restoring the Factory Default Settings A-14 APPENDIX A USING THE CONSOLE PORT entering option Updating theFirmware Image Checking the Xmodem-CRC To transfer the ﬁrmware image ﬁle log in again. To restart the ﬁle transfer, repeat steps 6 and during a ﬁrmware update, the CLI displays the following messageLogging Off While saving port settings or Table A-4 File Transfer Error MessagesTable A-5 Fatal Error Messages Environmental Operating Ranges SPECIFICATIONSPhysical Dimensions Page TECHNICAL SUPPORT ServicesBoard Service Online Technical 1 408 654 Access by Analog ModemAccess by Digital Modem C-2 APPENDIX C TECHNICAL SUPPORT Local access numbers are available within the following countries Central European HQ Santa Clara, CaliforniaCzech Republic/Slovak 305 261 3266 Miami, Florida To obtain an RMA number, call or fax Page GLOSSARY access method Carrier Sense Multiple Access/Collision Detection. Channel accesscable is based on CSMA/CD Carrier Sense Multiple Access/Collision transmission of light signals ﬂow control IEEEincoming Mbps control. See also asymmetric ﬂow control, ﬂow control, pause frame Numbers SymbolsINDEX Page Switch 9300 3-2, 3-3 Page HARDWARE 3Com Corporation LIMITED WARRANTYSTANDARD WARRANTY SERVICE SOFTWARE GOVERNING LAW FCC CLASS A VERIFICATION STATEMENTLIMITATION OF LIABILITY