Making Connections | 3Com Hub 1000 SX guide

MAKING CONNECTIONS

3

MAKING CONNECTIONS

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 3-1Gigabit Ethernet Maximum Cable Lengths

					Cable Type

			50/125 ∝	62.5/125 ∝		Shielded
	Laser	Connector	Multimode	Multimode	Single-Mode	Balanced Pair
Signal Type	Wavelength	Type	Fiber	Fiber	Fiber	(Coaxial Jumper)

1000BASE-SX	Short	SC	550 meters	260 meters	N/A	N/A
	(850 nm)
1000BASE-LX*	Long	SC	550 meters	440 meters	3 kilometers	N/A
	(1300 nm)
1000BASE-CX	N/A	HSSDC	N/A	N/A	N/A	25 meters

* The 1000BASE-LX GBIC module requires an external patch cord for connection to MMF cable.

CAUTION: Connecting the downlink of one Hub 1000 SX to the uplink of a second Hub 1000 SX degrades the performance of the second hub.

CAUTION: Connecting a Gigabit Ethernet switch downlink to a Hub 1000 SX downlink degrades the performance on the link to the switch.

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3Com Hub 1000 SX manual Making Connections, 1 Gigabit Ethernet Maximum Cable Lengths

Contents

A member of the 3Com SuperStack II System SuperStack II Hub 1000 SXUser Guide UNITED STATES GOVERNMENT LEGENDS 3Com Corporation 5400 Bayfront Plaza Santa Clara, California ABOUT THIS GUIDE 1 INTRODUCTION CONTENTS2 INSTALLING THE HUB POST Messages A USING THE CONSOLE PORT3 MAKING CONNECTIONS GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY SPECIFICATIONSTECHNICAL SUPPORT FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page Port Conﬁguration Menu TABLESPage Icon ABOUT THIS GUIDENotice Type Description SETDEFAULT !0 -IP NETaddr = CommandsMenu commands and buttons General Description INTRODUCTIONHub 1000 SX and Uplink DownlinksFull-Duplex Operation Flow Control Functions Features and SuperStack II Hub 1000 SX User Guide INSTALLING THE HUB Hub Description The hub’s front and rear panels are shown in Figure Connecting the Hub Installing and 4 Repeat steps 2 and 3 for the other side of the hub Table 2-1 Downlink Connections ConnectorMaximum Cable Type Indicator Table 2-2 Hub 1000 SX IndicatorsColor Status The gigabit interface connector GBIC port on the rear panel of the Connecting aGBIC Module Power Systems Using Optional Cabling Options Power Modules Table 2-4 Advanced RPS Conﬁguration Options A hub connects to a UPS unit through the hub’s AC power cord 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 Table 3-1 Gigabit Ethernet Maximum Cable Lengths MAKING CONNECTIONS Aggregating Power WorkgroupServers 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 3-4 CHAPTER 3 MAKING CONNECTIONS Figure 3-3 Aggregated Switches Connection The best use of the hub uplink is as a backbone connection to a 3Com ConnectingFigure 3-4 Mixed Connection Table 3-2 Troubleshooting Tips Figure 3-6 Uplink Connection to a 10/100 Mbps SwitchSymptom Solution USING THE CONSOLE PORT With Power Connecting theRequirements Console Port To connect the console port when the hub is disconnected from powerConnecting the Console Port A-3 Disconnected After 4 minutes of inactivity, the CLI logs off automatically Logging Onmessage, return the hub to the supplier Port Settings PasswordChanging the Conﬁguring To display the Port Conﬁguration menu Table A-2 Port Conﬁguration Menu Configuring Port Settings A-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 Information Displaying Hub Status A-13 A-14 APPENDIX A USING THE CONSOLE PORT Restoring the Factory Default Settings Firmware Image Updating theentering option 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 Board Service ServicesTECHNICAL SUPPORT Online Technical Access by Digital Modem Access by Analog Modem1 408 654 C-2 APPENDIX C TECHNICAL SUPPORT Local access numbers are available within the following countries Czech Republic/Slovak Santa Clara, CaliforniaCentral European HQ 305 261 3266 Miami, Florida To 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 signals incoming IEEEﬂow control Mbps control. See also asymmetric ﬂow control, ﬂow control, pause frame Numbers SymbolsINDEX Page Switch 9300 3-2, 3-3 Page STANDARD WARRANTY SERVICE 3Com Corporation LIMITED WARRANTYHARDWARE SOFTWARE GOVERNING LAW FCC CLASS A VERIFICATION STATEMENTLIMITATION OF LIABILITY