3Com 3C16702A Switch User Manual
Contents
1. SCOM OfficeConnect Ethernet Hub 16C 3C16702A User Guide 3Com Corporation m 5400 Bayfront Plaza m Santa Clara California m 95052 8145 Copyright 2002 3Com Technologies All rights reserved Microsoft MS DOS Windows and Windows NT are registered trademarks of Microsoft Corporation Novell and NetWare are registered trademarks of No part of this documentation may be reproduced in any form or by any means Noell hae or used to make any derivative work such as translation transformation or adaptation without written permission from 3Com Technologies All other company and product names may be trademarks of the respective 3Com Technologies reserves the right to revise this documentation and to make A sal esse 0 changes in content from time to time without obligation on the part of 3Com Please e mail any comments about this document to 3Com at Technologies to provide notification of such revision or change pddtechpubs_comments 3Com com Please include the document title OfficeConnect Ethernet Hub 16C part number DUA1670 2AAA04 and if 3Com Technologies provides this documentation without warranty term or appropriate the page number condition of any kind either implied or expressed including but not limited to the implied warranties terms or conditions of merchantability satisfactory quality and fitness for a particular purpose 3Com may make improvements or changes in the product s and or the program s des2. temperature 185 4 mm 7 3 in 15 2 mm 0 6 in Oo humidity 960 g 2 1 Ib for coaxial port 0 to 90 condensing a A non con g 17 Standards Functional Safety EMC Environmental ISO 8802 3 IEEE 802 3 UL 1950 EN 60950 CSA 22 2 950 IEC 60950 EN 55022 Class Bt EN 55024 FCC Part 15 Class B ICES 003 Class B YCC Class B CNS 13438 Class A EN 60068 IEC 68 Various parts tCategory 3 or 5 screened or unscreened cables can be used to comply with the Class B requirements Refer to Regulatory Notices on page 19 for conditions of operation ENVIRONMENTAL STATEMENTS It is the policy of 3Com Corporation to be environmentally friendly in all operations To uphold our policy we are committed to Establishing environmental performance standards that comply with national legislation and regulations Conserving energy materials and natural resources in all operations Reducing the waste generated by all operations Ensuring that all waste conforms to recognized environmental standards Maximizing the recyclable and reusable content of all products Ensuring that all products can be recycled reused and disposed of safely Ensuring that all products are labelled according to recognized environmental standards Improving our environmental record on a continual basis 13 End Of Life Statement 3Com processes allow for the recovery recl
3. Clip The stacking clip allows you to stack your OfficeConnect units together neatly and securely A CAUTION You can stack up to a maximum of four units Smaller units must be stacked on top To fit the clip 1 Place your unit on a flat surface 2 Fit the clip across the top of the unit as shown in Figure 2 picture 1 ensuring that the longer sections of the fastening pieces are pointing downwards 3 Align the fastening pieces over the slots found on each side of the unit 4 Push the clip down gently to secure it ensuring the fastening pieces snap into the slots on the unit To fit another unit 1 Rest the second unit on top of the clip and align it with the front of the unit below 2 Press down gently on the unit to secure it onto the clip ensuring the fastening pieces fit into the slots on the unit below as shown in Figure 2 picture 2 Figure 2 Stacking Your Units Together l Fastening 2 To remove the clip 1 Remove the top unit together with the clip If you hook a finger around one of the the fastening pieces and then pull it gently from out of the slot the clip should come away with the upper unit attached to it 2 Push the clip in the center so it bends towards the base of the unit and then separate once the clip is loose Positioning Your OfficeConnect Hub When installing your OfficeConnect hub ensure m It is out of direct sunlight and away from sources of heat m Cablin
4. partitioned due to a fault on that segment The Coaxial port LED can only be yellow gt Network Utilization LEDs green yellow orange Indicates how much your network is being used eg 3167028 i Port en A Network Utilization CAN i 2 B os B 6 7 8 3com Alert Power Collision 6 10 n 12 i 14 5 16 COAX 1 2 3 6 12 25 50 80 Green OK Yellow Partitioned OfficeConnect Ethernet Hub 16C y DIL Ethernet Hub 16C Rear gt Power Adapter socket Only use the power adapter that is supplied with this OfficeConnect hub Do not use any gt Coaxial port Can be used to connect your hub to other OfficeConnect hubs and equipment with 10BASE 2 Coaxial gt Uplink Normal switch Affects the operation of port 16 If you are connecting a hub to the port set to Uplink in otherwise set to Normal out See the Connecting OfficeConnect Hubs Together section gt Sixteen 10BASE T RJ 45 ports Use suitable TP cable with RJ 45 connectors You can connect the OfficeConnect hub to any workstation or OfficeConnect hub that has a 10BASE T port See the Connecting OfficeConnect Hubs Together section YUU LUE These are shielded RJ 45 data sockets They cann
5. workstations 3 One Straight through 10BASE T cable for every workstation or piece of equipment A Straight through cable is one where the pins of one connector are connected to the same pins of the other connector 10BASE T cables can be shielded or unshielded We recommend you use shielded The maximum length you can use Is 100m 328ft gt In order to comply with the 10BASE T standard ports designed for workstation connections have been marked with the graphical symbol x This denotes a crossover in the port s internal wiring for example 1x 2x 3X Hub Connections If you have additional hubs you want to connect using 10BASE 2 Coaxial you need m One 10BASE 2 50 Ohm cable for each additional hub The minimum cable length you can use is 0 5m 1 6 ft The maximum segment length you can have is 185m 607ft m One 10BASE 2 Y piece for each hub You can use T pieces but Y pieces provide optimum clearance of the other ports m Two 10BASE 2 50 Ohm terminators end pieces If you want to connect additional hubs using 10BASE T you need m One Straight through 10BASE T cable for each additional hub Stacking the Units together The Rubber Feet The four self adhesive rubber feet prevent your hub from moving around on your desk Stick the feet to the marked areas at each corner of the underside of your hub Do not fix the feet if you are going to use the clip The Stacking
6. 2 Stock No 004 000 00345 4 In order to meet FCC emissions limits this equipment must be used only with cables which comply with IEEE 802 3 Wall mounting screw hole guide 142mm 5 6in 20 Part No DUA 1670 2AAA04 Published April 2002
7. amation and safe disposal of all end of life electronic components Regulated Materials Statement 3Com products do not contain any hazardous or ozone depleting material Environmental Statement about the Documentation The documentation for this product is printed on paper that comes from sustainable managed forests it is fully biodegradable and recyclable and is completely chlorine free The varnish is environmentally friendly and the inks are vegetable based with a low heavy metal content Environmental Statement about the Product Packaging The packaging for this product is fully recyclable It has a recycled post consumer waste content of at least 40 by weight and no heavy metal content REGULATORY NOTICES FCC STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules and the Canadian Department of Communications Equipment Standards entitled Digital Apparatus ICES 003 These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment causes interference to radio or television re
8. ception which can be determined by turning the equipment off and on try to correct the interference by using one or more of the following measures m Reorient the receiving antenna m Relocate the equipment with respect to the receiver m Move the equipment away from the receiver m Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits m Consult the dealer or an experienced radio television technician for help CSA STATEMENT This Class B digital apparatus meets all requirements of the Canadian interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du Reglement sur le mat riel brouilleur du Canada CE STATEMENT EUROPE This product complies with the European Low Voltage Directive 73 23 EEC and EMC Directive 89 336 EEC as amended by European Directive 93 68 EEC 19 VCCI STATEMENT CORB FR UEREFERHEBEH HZ VCCI ORE IOS TIA B RHEE CT CORB FERCA eANELTRETM CORBMIVTPCTL EVs RERET RINDE AEREA E CIEN GOES Ra AAS ICE TELM RORWELTEA BSMI STATEMENT Wi Pe ok FS SEE ESA m EEN HOARE gt TAG CGR IE BUT gt GF Or ERR BR o INFORMATION TO THE USER The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington DC 2040
9. cribed in this documentation at any time If there is any software on removable media described in this documentation it is furnished under a license agreement included with the product as a separate document in the hard copy documentation or on the removable media in a directory file named LICENSE TXT or LICENSE TXT If you are unable to locate a copy please contact 3Com and a copy will be provided to you UNITED STATES GOVERNMENT LEGEND If you are a United States government agency then this documentation and the software described herein are provided to you subject to the following All technical data and computer software are commercial in nature and developed solely at private expense Software is delivered as Commercial Computer Software as defined in DFARS 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a and as such is provided with only such rights as are provided in 3Com s standard commercial license for the Software Technical data is provided with limited rights only as provided in DFAR 252 227 7015 Nov 1995 or FAR 52 227 14 June 1987 whichever is applicable You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in or delivered to you in conjunction with this User Guide Unless otherwise indicated 3Com registered trademarks are registered in the United States and may or may not be registered in other countries 3C
10. do next Perform these actions first m Ensure all equipment is powered on m Power each unit off wait about 5 seconds and then power them on Check the following symptoms and solutions Power LED not lit Check your power adapter connection If there is still no power you may have a faulty power adapter which needs replacing with another OfficeConnect power adapter Do not use any other power adapter with the hub Port Status LED yellow for a 10BASE T port It is likely that there is a loop in your network which has caused this port to partition Examine your connections and remove the loop Each piece of equipment needs only one connection to your OfficeConnect hub The LED will change from yellow to green on receiving a valid packet on the port 14 Link between two OfficeConnect hubs not working Check your hub connections follow the information given in the Connecting OfficeConnect Hubs Together on page 11 With 10BASE T it is likely that an Uplink Normal switch is incorrectly set With 10BASE 2 Coaxial it is likely a terminator end piece is not properly fitted this would cause the Coaxial Port Status LED to light yellow partition Alert LED continuously lit There is either continual excessive use of your network over 80 or more likely a 10BASE T port has partitioned due to a loop in your network in which case the corresponding Port Status LED will be yellow Examine your connections and remove the loo
11. eConnect devices to the desktop or onto a shelf in a rack Connecting Workstations and Other Equipment to Your Hub WARNING Please read the Important Safety Information sheet before you start h WARNHINWEIS Bitte lesen Sie den Abschnitt Wichtige Sicherheitsinformationen sorgf ltig durch bevor Sie das Ger t einschalten AVERTISSEMENT Veuillez lire attentivement la section Consignes importantes de s curit avant de mettre en route A CAUTION Do not power the hub off and on quickly Wait about five seconds between power cycles Connecting workstations and other equipment to your hub is easy Connect them using 10BASE T cables to any of the hub sixteen 10BASE T RJ 45 ports 10BASE T cables are very easy to use To connect a 10BASE T cable simply slot the connector into the relevant RJ 45 port When the connector is fully in its latch locks it into place To disconnect the cable push the connector s latch in and remove it 11 The hub detects all port connections so you can start using your network immediately When you need more ports simply add more OfficeConnect hubs i gt If you are using port 16 to connect to a workstation ensure the Uplink Normal switch is set to Normal out Connecting OfficeConnect Hubs Together You can increase the number of workstations that can connect to your network by adding more OfficeConnect hubs You can use either 10BASE T or 10BASE 2 Coaxial to do
12. egabits per second 10BASE T is the name given to the Ethernet protocol that runs over Twisted Pair TP cable at 10Mbps The OfficeConnect hub uses RJ 45 type connectors for connecting your TP network 10BASE 2 is the name given to the Ethernet protocol that runs over Coaxial cable 16 A Network Loop occurs when two pieces of network equipment are connected by more than one path Your hub detects this and partitions isolates one of its ports to break the loop A segment is the length of cable connected to a port whether this cable is 10BASE T 10BASE 2 Coaxial or another type When you daisy chain equipment together with 10BASE 2 Coaxial cable via single speed hubs the entire cable forms a single segment Packets are the units of information your workstations and other equipment send to each other over the network Collisions are a part of normal Ethernet operation and occur if two or more devices pieces of network equipment attempt to transmit at the same time A sudden sustained increase in the number of collisions can indicate a problem with a device particularly if it is not accompanied by a general increase in traffic On coaxial segments an increase in collisions can also indicate faulty cabling DIMENSIONS AND STANDARDS Dimensions and Operating Conditions 6 73 W 23 00 BThU hr gt 228 mm 9 12 in power requirement _4 54 6 mm 2 1 in O to 40 C 32 to 105 NN gt operating gt GG
13. g is away from power lines fluorescent lighting fixtures and sources of electrical noise such as radios transmitters and broadband amplifiers m Water or moisture cannot enter the case of the unit m Air flow around the unit and through the vents in the side of the case is not restricted We recommend you provide a minimum of 25 4 mm 1in clearance 10 Securing the OfficeConnect Hub There are two slots on the underside of the OfficeConnect hub which can be used for wall mounting It is recommended that you mount the hubs with the LEDs facing upwards to prevent dust entering the cooling vents When wall mounting the unit ensure that it is within reach of the power outlet You need two suitable screws Ensure that the wall you are going to use is smooth flat dry and sturdy Make two screw holes which are 142mm 5 6in apart Use the guide at the back of this manual to mark the position of the holes Fix the screws into the wall leaving their heads 3mm 0 12in clear of the wall surface Remove any connections to the unit and locate it over the screw heads When in line gently push the unit on to the wall and move it downwards to secure When making connections be careful not to push the unit up and off the wall N CAUTION Only wall mount single units do not wall mount stacked units Also available from 3Com is the OfficeConnect Mounting Unit part number 3C16765 This allows you to firmly secure a stack of Offic
14. ideal for creating small networks It is compact and attractively designed for desktop use This product forms part of the OfficeConnect range which neatly stack together with the OfficeConnect stacking clip When referring to the OfficeConnect Ethernet Hub 16C this guide uses the term OfficeConnect hub A single OfficeConnect hub allows you to create a small network with up to sixteen workstations as shown in Figure 1 Figure 1 Small Network With OfficeConnect Hub And Optional Print Server HP JetDirect OfficeConnect print server OfficeConnect hub IF you need to connect more workstations simply use the stacking clip to connect another OfficeConnect hub to form a stack each hub is a single repeater The OfficeConnect Ethernet Hub 16C has sixteen 10BASE T ports and one 10BASE 2 Coaxial connector CREATING YOUR NETWORK Ethernet Hub 16C Front gt Alert LED gt Power LED gt Collision LED orange green yellow Alerts you to Indicates that the Flashes each time excessive network power supply to a collision is use or an isolated the hub is present detected on the partitioned network 10BASE T port Collisions are part of normal network operation Port Status LEDs green yellow Indicates the status of each port If the LED is green the link between the port and the next piece of network equipment is OK If nothing is connected the LED is off If yellow the port has
15. om and OfficeConnect are registered trademarks of 3Com Corporation The 3Com logo is a trademark of 3Com Corporation Introduction 5 Creating Your Network 6 Ethernet Hub 16C Front 6 Ethernet Hub 16C Rear 7 Before You Start 8 Product Registration 8 Workstation Connections 8 Hub Connections 8 Stacking the Units together 9 The Rubber Feet 9 The Stacking Clip 9 Positioning Your OfficeConnect Hub 10 Securing the OfficeConnect Hub 10 Connecting Workstations and Other Equipment to Your Hub 11 Connecting OfficeConnect Hubs Together 11 Connecting Hubs Using 10BASE 2 Coaxial 12 Connecting Hubs Using 10BASE T 13 Checking Hub Connections 13 Spot Checks 13 Problem Solving 14 Networking Terminology 16 Dimensions and Standards 17 Dimensions and Operating Conditions 17 Standards 17 Environmental Statements 18 End Of Life Statement 18 Regulated Materials Statement 18 Environmental Statement about the Documentation 18 Environmental Statement about the Product Packaging 18 Regulatory Notices 19 INTRODUCTION Welcome to the world of networking with 3Com In the modern business environment communication and sharing information is crucial Computer networks have proved to be one of the fastest modes of communication but until recently only large businesses could afford the networking advantage The OfficeConnect product range from 3Com has changed this bringing networks to the small office The OfficeConnect Ethernet Hub 16C is
16. ot be used as teleohone sockets Only connect RJ 45 data connectors to these sockets Dies sind abgeschirmte RJ 45 Datenbuchsen Sie k nnen nicht als TelefonanschluBbuchsen verwendet werden An diesen Buchsen durfen nur RJ 45 Datenstecker other adapter cabling rn III 8X rT a Uplink Normal 16 Br E dei 10BASE T WARNING RJ 45 ports WARNHINWEIS RJ 45 Anschl sse AVERTISSEMENT Ports RJ 45 Il s agit de prises femelles blind es de donn es RJ 45 Vous ne pouvez pas les utiliser comme prise de t l phone Branchez uniquement des connecteurs de donn es RJ 45 Before You Start Your OfficeConnect hub comes with m One power adapter for use with the OfficeConnect hub m Four rubber feet m A stacking clip m One Support and Safety Information Sheet m One Warranty Flyer The extra parts mentioned in the next section are not supplied with the hub Product Registration You can now register your OfficeConnect hub on the 3Com web site and receive up to date information on your product http support 3com com registration frontpg pl Workstation Connections To connect workstations or other equipment to your hub you need 1 10BASE T connections for all your equipment 3Com produce a range of easy to install network adapters which provide your workstations with 10BASE T connections 2 An operating system for example Netware or Windows 95 98 with network support configured running on your
17. p Each piece of equipment needs only one connection to your OfficeConnect hub Port Status LED not lit for a port that has a connection There is a problem with this connection Check that you are using a Straight through cable which is properly connected at both ends and is not damaged If the cable is connected to port 16 ensure that the Uplink Normal switch is set to Normal out Also check that the equipment being connected to the hub is powered on operating correctly and contains the correct type of connection Refer to Figure 5 below to compare the wiring of a straight through and a crossover cable Figure 5 Straight through Cable Crossover Cable Uplink Normal 15 NETWORKING TERMINOLOGY A Network is a collection of workstations for example IBM compatible PCs and other equipment for example printers connected for the purpose of exchanging information or sharing resources Networks vary in size some are within a single room others span continents A Local Area Network LAN is a network usually in an office that spans no more than a single site Ethernet is a type of LAN referring to the technology used to pass Information around the network It operates at 10Mbps m
18. r with 10BASE T in a number of ways but for simplicity we recommend the following method 1 Starting from the bottom connect port 16 of the lower hub to port 15 of the hub immediately above Repeat for each hub as shown in Figure 4 2 Set all Uplink Normal switches to Uplink in except for Switch set to the top hub the one with port 16 not connected to Bone ou another hub This unused port can be connected to a workstation provided that the Uplink Normal switch is set to Normal out Checking Hub Connections Switch set to When you have connected your hubs power them on The Uplink in Port Status LEDs for the ports you have used on the hubs should be green If they are not check your connections and the settings of the Uplink Normal switches 10BASE T cable with RJ 45 connectors Spot Checks Maximum length is 100m 328ft At frequent intervals visually check that m The Alert LED is off this is the best way to find out if there are problems with your network m Case vents are not obstructed m Cabling is secure and not pulled taut 13 PROBLEM SOLVING The OfficeConnect hub has been designed to aid you when detecting and solving possible problems with your network These problems are rarely serious the cause is usually a disconnected or damaged cable or incorrect configuration If this section does not solve your problem contact your supplier for information on what to
19. this m With 10BASE 2 Coaxial you can connect up to 30 hubs on a single segment leaving all of the RJ 45 ports free m With 10BASE T you can connect up to four hubs in series CAUTION Do not connect the same two hubs together using both 10BASE T and 10BASE 2 Coaxial This causes a network loop Connecting Hubs Using 10BASE 2 Coaxial Figure 3 Correct Hub Connections Using 10BASE 2 Coaxial i gt When using 10BASE 2 Coaxial cable it is important that both ends of the segment are properly terminated with 50 Ohm terminators end pieces i gt Only use 50 Ohm 10BASE 2 Coaxial cables and use a Y piece for each hub You can use T pieces but Y pieces provide optimum clearance of the other ports 50 Ohm terminator Connect a 10BASE 2 Y piece to each of your hubs Daisy chain each Y piece with 10BASE 2 Coaxial cable to form a single segment as shown in Figure 3 Remember to terminate the two free ends of the segment by fitting terminators end pieces To disconnect a 10BASE 2 Coaxial cable twist each connector counter clockwise to unlock it and remove it pr terminator Maximum segment length is 10BASE 2 50 Ohm cable 185m 607 ft Minimum length is 0 5m 1 6ft from terminator to terminator 12 Connecting Hubs Using 10BASE T Figure 4 Correct Hub Connections Using 10BASE T You can connect hubs togethe
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