And be conﬁgured to receive pause frames | 3Com Hub 1000 SX guide

and be conﬁgured to receive pause frames.

A-10APPENDIX A: USING THE CONSOLE PORT

Because option 7 has been selected, the settings will persist after a hub reset.

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Port Configuration Menu

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(1)Enable port

(2)Disable port

(3)Enable Auto-Negotiation

(4)Disable Auto-Negotiation (Force link)

(5)Show port settings

(6)Use factory default settings

(7)Save new port settings

(8)Exit without change to settings

(9)Apply changes and exit

Selected ports: 1

Enter choice -> 9

Changes applied

Conﬁguring The uplink (port 9) defaults to symmetric (both outgoing and incoming) the Uplink for ﬂow control. You must conﬁgure the uplink for asymmetric ﬂow control Asymmetric to connect it to a server or 10/100 Mbps switch. The server or switch Flow Control must have the appropriate NIC or uplink device, support ﬂow control,

and be conﬁgured to receive pause frames.

The following example shows how to conﬁgure the uplink for asymmetric ﬂow control by disabling auto-negotiation, enabling outgoing ﬂow control, and disabling incoming ﬂow control. With this conﬁguration, the uplink is set to forced link and can send pause frames but ignores pause frames that it receives. (For more details on ﬂow control, see “Flow Control” in Chapter 1.)

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**Hub 1000 Configuration Menu **

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[1]Configure port settings

[2]Display hub status

[3]Update firmware image

[4]Change password

[5]Logout

Enter choice -> 1

Enter port number(s), from 1 to 9: 9

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3Com Hub 1000 SX manual and be conﬁgured to receive pause frames

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 SPECIFICATIONS GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTYTECHNICAL SUPPORT FCC CLASS A VERIFICATION STATEMENTPage FIGURES Page TABLES Port Conﬁguration MenuPage ABOUT THIS GUIDE IconNotice Type Description Commands SETDEFAULT !0 -IP NETaddr =Menu commands and buttons General Description INTRODUCTIONHub 1000 SX Downlinks and UplinkFull-Duplex 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 Connector Table 2-1 Downlink ConnectionsMaximum Cable Type Table 2-2 Hub 1000 SX Indicators IndicatorColor 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 Power Workgroup AggregatingServers 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 Figure 3-6 Uplink Connection to a 10/100 Mbps Switch Table 3-2 Troubleshooting TipsSymptom Solution USING THE CONSOLE PORT Connecting the With PowerRequirements Console Port from power To connect the console port when the hub is disconnectedConnecting the Console Port A-3 Disconnected After 4 minutes of inactivity, the CLI logs off automatically Logging Onmessage, return the hub to the supplier Password Port SettingsChanging the 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 Displaying Hub Statusmatrix, Y indicates yes and n indicates no. See Table A-3 Table A-3 Hub Status Information Displaying Hub Status A-13 Restoring the Factory Default Settings A-14 APPENDIX A USING THE CONSOLE PORT Updating the Firmware Imageentering 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 Services Board ServiceTECHNICAL SUPPORT Online Technical Access by Analog Modem Access by Digital Modem1 408 654 C-2 APPENDIX C TECHNICAL SUPPORT Local access numbers are available within the following countries Santa Clara, California Czech Republic/SlovakCentral European HQ 305 261 3266 Miami, Florida To obtain an RMA number, call or fax Page GLOSSARY Carrier Sense Multiple Access/Collision Detection. Channel access cable is based on CSMA/CD Carrier Sense Multiple Access/Collisionaccess method transmission of light signals IEEE incomingﬂow control Mbps control. See also asymmetric ﬂow control, ﬂow control, pause frame Numbers SymbolsINDEX Page Switch 9300 3-2, 3-3 Page 3Com Corporation LIMITED WARRANTY STANDARD WARRANTY SERVICEHARDWARE SOFTWARE GOVERNING LAW FCC CLASS A VERIFICATION STATEMENTLIMITATION OF LIABILITY