3Com Hub 1000 SX 6 Uplink Connection to a 10/100 Mbps Switch, 2 Troubleshooting Tips, Symptom

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Figure 3-6Uplink Connection to a 10/100 Mbps Switch

3-6CHAPTER 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.

Single-mode fiber-optic cable

Maximum distance: 3 km

SuperStack II	10/100 Mbps switch
Hub 1000 SX	with 3C16925 uplink device

Figure 3-6Uplink Connection to a 10/100 Mbps Switch

Troubleshooting Table 3-2 summarizes some common problems and their solutions.

Table 3-2Troubleshooting Tips

Symptom

Explanation

Solution

LINK LED does not light on a port.

ACTIVITY LED does not light on a port.

There is no link connection.

The port is not receiving data.

You may be attempting to connect to equipment that does not comply with Gigabit Ethernet standards or does not support auto-negotiation. Or, the link may be physically damaged (for example, the cable may be damaged).

Disable auto-negotiation on the port (see Appendix A). Configure the other end of the link for forced configuration (see the configuration guidelines for the device on the other end of the link). A restored connection rules out physical damage.

Make sure that the link is connected at both ends.

OVERTEMP LED is lit.	The unit has overheated.	Return the unit to the supplier.
	The fan may have failed.
Amber UNIT STATUS LED stays	POST software may	Use the command line interface (CLI) to confirm the
lit longer than 30 seconds.	be corrupted.	POST error. (See Appendix A.) If POST reports errors,
		return the unit to the supplier.

PAUSE LED remains lit.	A flickering PAUSE LED
	indicates normal flow control.
	A PAUSE LED that remains lit
	indicates that there is too
	much traffic.

Check for problems with the device attached to the Hub 1000 SX uplink.

POST FAIL messages appear	There is a fatal	Return the unit to the supplier.
in the CLI.	hardware error.

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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 TECHNICAL SUPPORT SPECIFICATIONSGLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page TABLES Port Conﬁguration MenuPage Notice Type ABOUT THIS GUIDEIcon DescriptionMenu commands CommandsSETDEFAULT !0 -IP NETaddr = and buttonsHub 1000 SX INTRODUCTIONGeneral Description Full-Duplex Downlinksand Uplink 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 Maximum Cable ConnectorTable 2-1 Downlink Connections TypeColor Table 2-2 Hub 1000 SX IndicatorsIndicator StatusGBIC Module Connecting aThe gigabit interface connector GBIC port on the rear panel of the Using 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 LengthsServers Power WorkgroupAggregating 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 Figure 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 Symptom Figure 3-6 Uplink Connection to a 10/100 Mbps SwitchTable 3-2 Troubleshooting Tips SolutionUSING THE CONSOLE PORT Requirements Connecting theWith Power Console PortConnecting the Console Port A-3 from powerTo connect the console port when the hub is disconnected Disconnectedmessage, return the hub to the supplier Logging OnAfter 4 minutes of inactivity, the CLI logs off automatically Changing the PasswordPort Settings 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 matrix, Y indicates yes and n indicates no. See Table A-3 DisplayingHub Status Table A-3 Hub Status InformationDisplaying Hub Status A-13 Restoring the Factory Default Settings A-14 APPENDIX A USING THE CONSOLE PORTentering option Updating theFirmware Image 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 TECHNICAL SUPPORT ServicesBoard Service Online Technical1 408 654 Access by Analog ModemAccess by Digital Modem C-2 APPENDIX C TECHNICAL SUPPORTLocal access numbers are available within the following countries Central European HQ Santa Clara, CaliforniaCzech Republic/Slovak 305 261 3266 Miami, FloridaTo 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 signalsﬂow control IEEEincoming Mbpscontrol. See also asymmetric ﬂow control, ﬂow control, pause frame INDEX SymbolsNumbers Page Switch 9300 3-2, 3-3 Page HARDWARE 3Com Corporation LIMITED WARRANTYSTANDARD WARRANTY SERVICE SOFTWARELIMITATION OF LIABILITY FCC CLASS A VERIFICATION STATEMENTGOVERNING LAW