Manuale d’uso / di manutenzione del prodotto Hub 1000 SX del fabbricante 3Com
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® http://www.3com.com/ SuperStack ® II Hub 1000 SX User Guide A member of the 3Com SuperStack II System Part No. 09-1354-000 Published March 1998.
ii 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 Copyright © 1998, 3Com Corporation. All rights reserved. No part of this documentation may be r eproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.
C ONTENTS A BOUT T HIS G UIDE 1 I NTRODUCTION Hub 1000 SX General Description 1-1 Downlinks and Uplink 1-2 Full-Duplex Operation 1-2 Flow Control 1-2 Asymmetric Flow Control 1-3 Symmetric Flow Control.
iv 3 M AKING C ONNECTIONS Aggregating Servers 3-2 Connecting a Power Workgr oup 3-2 Aggregating Switches 3-3 Mixing Connections 3-4 Connecting Through the Uplink 3-5 T roubleshooting 3-6 A U SING THE .
v B S PECIFICATIONS C T ECHNICAL S UPPORT Online T echnical Services C-1 World Wide Web Site C-1 3Com Bulletin Board Service C-1 Access by Analog Modem C-2 Access by Digital Modem C-2 3ComFacts Automa.
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vii F IGURES 2-1 Hub 1000 SX Front and Rear Panels 2-2 2-2 Attaching a Bracket for Rack Mounting 2-4 2-3 Rack Mounting the Hub 2-4 2-4 Sample GBIC Module 2-7 3-1 Server Farm Connection 3-2 3-2 Power W.
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ix T ABLES 1 Notice Icons 1 2 T ext Conventions 2 2-1 Downlink Connections 2-5 2-2 Hub 1000 SX Indicators 2-6 2-3 GBIC Modules 2-7 2-4 Advanced RPS Configuration Options 2-10 3-1 Gigabit Ethernet Max.
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A BOUT T HIS G UIDE This guide contains installation pr ocedur es and technical information about the 3Com ® SuperStack ® II Hub 1000 SX Gigabit Ethernet full-duplex repeater (part number 3C510-SX).
2 A BOUT T HIS G UIDE T able 2 T ext Conventions Convention Description Screen displays This typeface represents information as it appears on the screen. Commands The word “command” means you must enter the command exactly as shown in text and press Return or Enter.
1 I NTRODUCTION Gigabit Ethernet technology allows signal transmission at the rate of one gigabit per second (1 Gbps, or 1000 Mbps), while continuing to support IEEE 802.
1-2 C HAPTER 1: I NTRODUCTION Downlinks and Uplink The hub’ s eight 1000BASE-SX full-duplex downlink ports (downlinks) can connect to servers or clients that ar e equipped with Gigabit Ethernet network interface car ds (NICs) or to 10/100 Mbps switches that ar e equipped with Gigabit Ethernet uplink devices.
Flow Control 1-3 When the receiver’ s input buf fers can store packets again, it can either send another pause frame to tell the transmitter to r esume transmission, or wait for transmission to r esume. If the Hub 100 SX receives a pause frame, it does not remove the frame from the network.
1-4 C HAPTER 1: I NTRODUCTION Features and Functions The hub can be mounted in a 19-inch standar d rack or placed on a flat surface. It supports the 1000 Mbps media access contr ol (MAC) as specified in the IEEE 802.3z standard. In addition, the hub has these features: ■ LED indicators report the status of each port and of hub operations.
2 I NSTALLING THE H UB This chapter describes the Hub 1000 SX package contents and pr ovides installation procedur es for the hub and for optional GBIC modules and power systems.
2-2 C HAPTER 2: I NSTALLING THE H UB If you need to return the hub to 3Com, pack it in the original (or equivalent) packing material to maintain the warranty . If you order ed a GBIC module or optional power system, it is packaged separately from the hub.
Preparing the Site 2-3 Rear Panel The AC input socket accepts a 100–240 V AC power cord. Power can be supplied through optional 3Com SuperStack II Advanced Redundant Power System (Advanced RPS) and SuperStack II Uninterruptible Power System (UPS) units.
2-4 C HAPTER 2: I NSTALLING THE H UB . Figure 2-2 Attaching a Bracket for Rack Mounting 3 Insert the two scr ews and tighten with a scr ewdriver . Do not overtighten the screws. 4 Repeat steps 2 and 3 for the other side of the hub. 5 Mount the hub in the rack and secur e it with suitable scr ews, as shown in Figure 2-3.
Interpreting Hub Indicators 2-5 7 Apply power to the hub in either of these ways: ■ Plug one end of the power cor d into the AC input socket and the other end into a power sour ce. ■ Connect the hub to a power supply , as described in “Using Optional Power Systems” later in this chapter .
2-6 C HAPTER 2: I NSTALLING THE H UB T able 2-2 Hub 1000 SX Indicators Indicator Color Status Meaning % BW usage meter Green Fluctuating The meter indicates the percentage of bandwidth that the hub is using. Because the hub can be connected to multiple network segments, this meter represents the aggregate load on the hub.
Installing and Connecting a GBIC Module 2-7 Installing and Connecting a GBIC Module The gigabit interface connector (GBIC) port on the r ear panel of the Hub 1000 SX chassis accepts an optional 3Com GBIC module that permits connection to a Gigabit Ethernet device.
2-8 C HAPTER 2: I NSTALLING THE H UB T o install and connect a GBIC module, follow these steps: 1 Disconnect all power to the Hub 1000 SX. Disconnect the AC power cor d. If you ar e using an Advanced RPS unit, disconnect the RPS cable fr om the DC power connector .
Using Optional Power Systems 2-9 Power Modules At least one SuperStack II Advanced Redundant Power System Power Module T ype 2 is requir ed for each SuperStack II hub that you want to protect. The Hub 1000 SX requires the 100-watt, 3.3-volt version of the module (part number 3C16074).
2-10 C HAPTER 2: I NSTALLING THE H UB When switching from Advanced RPS (DC) to AC power or from AC power to Advanced RPS power , the Hub 1000 SX unit resets itself. For example, if both the RPS and AC cables are plugged in, and then either is removed, the unit resets itself when it changes to the other power source.
Using Optional Power Systems 2-11 Y ou 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. T o verify that the UPS unit’ s maximum wattage is not exceeded, calculate the total power consumption of all units connected to the Advanced RPS.
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3 M AKING C ONNECTIONS This chapter contains guidelines for making typical Hub 1000 SX network connections and for tr oubleshooting pr oblems with the hub. When making hub connections, follow the rules for maximum cable lengths, which are summarized in T able 3-1.
3-2 C HAPTER 3: M AKING C ONNECTIONS Aggregating Servers Y ou can use the Hub 1000 SX downlinks to aggregate servers into server farms . First, install 3Com 3C985-SX Gigabit EtherLink ® Server NICs in each server . Then, connect up to eight servers through the downlinks.
Aggregating Switches 3-3 Figure 3-2 Power W orkgroup Connection Aggregating Switches Y ou can use the Hub 1000 SX downlinks to aggregate 10/100 Mbps switches such as the 3Com SuperStack II Switch 1000, Switch 3000, or Switch 3900.
3-4 C HAPTER 3: M AKING C ONNECTIONS Figure 3-3 Aggr egated Switches Connection Mixing Connections Y ou can vary connections according to your r equirements. For example, you can connect a number of servers and 10/100 Mbps switches thr ough the downlinks, and connect to the network backbone thr ough the uplink, as shown in Figur e 3-4.
Connecting Through the Uplink 3-5 Figure 3-4 Mixed Connection Connecting Through the Uplink The best use of the hub uplink is as a backbone connection to a 3Com SuperStack II Switch 9300 Gigabit Ethernet switch, as shown earlier in Figure 3-1 thr ough Figure 3-2.
3-6 C HAPTER 3: M AKING C ONNECTIONS 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 Figur e 3-6).
A U SING THE C ONSOLE P ORT The Hub 1000 SX is ready to use and r equires no configuration. However , on rare occasions you may need to confi rm a POST failure, change a port’ s configuration, or update the firmwar e image to install a bug fix or a standards update.
A-2 A PPENDIX A: U SING THE C ONSOLE P ORT Requir ements T o use the console port and CLI, you need: ■ A PC with a serial port ■ A null modem cable ■ A terminal-emulation pr ogram If you need to perform a firmwar e update, the terminal-emulation program must support one of these fi le transfer protocols: Xmodem, Xmodem-1K, or Xmodem-CRC.
Connecting the Console Port A-3 With Power Disconnected T o connect the console port when the hub is disconnected from power: 1 Connect a null modem cable between the PC serial port and the console port on the Hub 1000 SX r ear panel. 2 T ur n on the PC.
A-4 A PPENDIX A: U SING THE C ONSOLE P ORT Hardware Version 0 Bootcode Version 1.00, 02/05/98 Firmware Version 1.00, 02/05/98 **************************************************** * * * SuperStack II (.
Changing the Password A-5 Changing the Passwor d Y ou can change the password if you need to. The new passwor d must be eight characters or fewer and cannot contain spaces or tabs.
A-6 A PPENDIX A: U SING THE C ONSOLE P ORT T o display the Port Configuration menu: 1 At the Configuration menu pr ompt, enter: 1 2 At the next prompt, enter the numbers of the ports that you want to configure.
Configuring Port Settings A-7 Disabling Ports The following example shows how to disable ports 3, 5, 6, and 7 and apply the changes. *************************************************** ** Hub 1000 Con.
A-8 A PPENDIX A: U SING THE C ONSOLE P ORT (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 po.
Configuring Port Settings A-9 *************************************************** ** Hub 1000 Configuration Menu ** *************************************************** [1] Configure port settings [2] .
A-10 A PPENDIX A: U SING THE C ONSOLE P ORT Because option 7 has been selected, the settings will persist after a hub reset. **** Port Configuration Menu **** (1) Enable port (2) Disable port (3) Enab.
Configuring Port Settings A-11 **** Port Configuration Menu **** (1) Enable port (2) Disable port (3) Enable Auto-Negotiation (4) Disable Auto-Negotiation (Force link) (5) Show port settings (6) Use f.
A-12 A PPENDIX A: U SING THE C ONSOLE P ORT Displaying Hub Status Hub status includes a matrix of information about the hub ports. In this matrix, Y indicates yes and n indicates no. (See T able A-3.) T able A-3 Hub Status Information Category State Description Port is enabled Y The port is enabled for linking.
Displaying Hub Status A-13 Hub status also includes POST and fan status, bandwidth utilization, hardwar e and firmware version, and MAC addr ess. The sample hub status display that follows is the r esult of the changes made in the previous section.
A-14 A PPENDIX A: U SING THE C ONSOLE P ORT Restoring the Factory Default Settings T o restor e port settings to factory defaults: 1 At the Configuration menu pr ompt, enter: 1 2 Enter the numbers of the ports to be r estored to factory defaults. 3 At the Port Configuration menu pr ompt, enter: 6 4 Apply the changes.
Updating the Firmware Image A-15 **** Port Configuration Menu **** (1) Enable port (2) Disable port (3) Enable Auto-Negotiation (4) Disable Auto-Negotiation (Force link) (5) Show port settings (6) Use.
A-16 A PPENDIX A: U SING THE C ONSOLE P ORT T ransferring the Firmware Image File Make sure that the terminal-emulation pr ogram supports one of the following file transfer protocols: Xmodem, Xmodem-1K, or Xmodem-CRC.
Logging Off A-17 7 When prompted, enter the fi lename of the firmware image file. The terminal-emulation pr ogram begins to transfer the firmwar e image file. If you want to stop the file transfer , use the appropriate command in the terminal-emulation pr ogram.
A-18 A PPENDIX A: U SING THE C ONSOLE P ORT T able A-5 lists fatal error messages. These messages indicate that the memory unit has failed. If you see a fatal err or message, return the unit to the supplier . T able A-4 File T ransfer Error Messages Message Meaning Action Xmodem error: Timed out sending NAK.
B S PECIFICA TIONS This appendix lists the specifications for the SuperStack II Hub 1000 SX. Physical Dimensions Environmental Operating Ranges Power Requirements Height: 4.37 cm (1.72 in.) Width: 43.94 cm (17.3 in.) Depth: 30.48 cm (12 in.) Weight: 5.
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C T ECHNICAL S UPPORT 3Com provides easy access to technical support information thr ough a variety of services. This appendix describes these services. Information contained in this appendix is corr ect at time of publication. For the very latest, we r ecommend that you access 3Com Corporation’ s World Wide Web site.
C-2 A PPENDIX C: T ECHNICAL S UPPORT Access by Analog Modem T o reach the service by modem, set your modem to 8 data bits, no parity , and 1 stop bit. Call the telephone number near est you: Access by Digital Modem ISDN users can dial in to 3ComBBS using a digital modem for fast access up to 56 Kbps.
Support from Your Network Supplier C-3 Local access numbers ar e available within the following countries: 3ComForum on CompuServe Online Service 3ComForum contains patches, softwar e, drivers, and technical articles about all 3Com products, as well as a messaging section for peer support.
C-4 A PPENDIX C: T ECHNICAL S UPPORT Support fr om 3Com If you are unable to r eceive support from your network supplier , technical support contracts ar e available from 3Com. Contact your local 3Com sales of fice to find your authorized service provider using one of these numbers: Regional Sales Office Telephone Number 3Com Corporation P.
Returning Products for Repair C-5 Returning Products for Repair Before you send a pr oduct directly to 3Com for r epair , you must first obtain a Return Materials Authorization (RMA) number . Products sent to 3Com without RMA numbers will be r eturned to the sender unopened, at the sender’ s expense.
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G LOSSARY 10BASE-T The IEEE 802.3 physical layer specification for a 10 Mbps Ether net network over two pairs of Category 3, 4, or 5 UTP wir e. 100BASE-T The group of IEEE 802.3 physical layer specifications for a 100 Mbps Ethernet network over various wiring specifications.
2 G LOSSARY bidirectional flow control See symmetric flow control. CSMA/CD Carrier Sense Multiple Access/Collision Detection. Channel access method used by Ethernet and IEEE 802.3 in which devices transmit only after finding the data channel clear for some period.
G LOSSARY 3 IEEE Institute of Electrical and Electr onics Engineers. Committees that develop and propose computer standar ds, such as the 802 protocols, which define the physical and data link pr otocols of communication networks. Members r epresent an international cr oss section of users, vendors, and engineering pr ofessionals.
4 G LOSSARY SC A fiber -optic cable connector . When it is pushed into place, the connector is seated automatically . STP Shielded twisted-pair . Shielded four -conductor electrical cable that offers high-speed transmission for long distances.
I NDEX Symbols % BW usage meter 2-6 Numbers 1000BASE-CX 1-2 1000BASE-LX 1-2 1000BASE-SX 1-2 1000BASE-X cables and connectors 3-1 3C16925 Gigabit Ether net SX uplink module 3-3 3C985-SX Gigabit EtherLi.
2 I NDEX E environmental operating ranges B-1 F factory defaults, restoring port configuration A-14 fax service (3ComFacts) C-2 firmware image, updating A-15 flow control 1-2, A-10 flow control, a.
I NDEX 3 POST description 1-4 diagnostics 2-6 messages A-3 power requir ements B-1 systems, optional 2-8 power consumption calculation for Advanced RPS 2-11 Power Modules 2-9, 2-10 power on 2-5 power .
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3Com Corporation L IMITED W ARRANTY +5 Limited Warranty The duration of the warranty for the SuperStack II Hub 1000 SX is five (5) years, with the exception of the product’s fans and power supplies, which are warranted for the first year only.
L IMITATION OF L IABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CO.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il 3Com Hub 1000 SX è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del 3Com Hub 1000 SX - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com Hub 1000 SX imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com Hub 1000 SX ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com Hub 1000 SX, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del 3Com Hub 1000 SX.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com Hub 1000 SX. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com Hub 1000 SX insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
