OfficeConnect ® Ethernet Hub 4, 4C, 8, 8C (3C16704A, 3C16703A, 3C16700A, 3C16701A) User Guide
3Com Corporation ■ 5400 Bayfront Plaza Copyright © 2002, 3Com Technologies. All rights reserved. No part of this documentation may be reproduced 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 Technologies.
Introduction 5 Spot Checks 14 Creating your Network 6 What Else Do I Need? 6 Product Registration 6 Workstation Connections 6 Transceiver Connections 6 Hub Connections 7 10BASE-2 7 10BASE-T 7 Twisted Pair (TP) Cables 7 Stacking the Units Together 8 The Rubber Feet 8 The Stacking Clip 8 Positioning Your Hub 9 Securing Your Hub 9 Using Your Hub 9 Problem Solving for the Hub 4 and 4C 15 The OfficeConnect Ethernet Hub 4 and 4C 10 Ethernet Hub 4 and 4C—Front 10 Ethernet Hub 4 and 4C—Rear 11 Connecting Workst
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 advantage of networking. The OfficeConnect® product range from 3Com has changed this, bringing networks into the small office.
CREATING YOUR NETWORK 1 10BASE-T connections for all What Else Do I Need? your equipment. 3Com produce a range of easy to install network adapter cards, which provide your workstations with 10BASE-T connections. Your OfficeConnect hub comes with: ■ One power adapter for use with the OfficeConnect hub. ■ Four rubber feet. ■ A stacking clip.
Figure 2 Hub Connections Some of the 10BASE-2 Equipment You May Need Depending on what ports your hub has, you can use either 10BASE-T or 10BASE-2 to connect your hubs together: ■ With 10BASE-2 you can connect up to 30 hubs on a single segment, leaving all of the 10BASE-T ports free. ■ With 10BASE-T you can connect up to four hubs in series.
To fit another unit: Stacking the Units Together 1 Rest the second unit on top of the clip and align it with the front of the unit below. The Rubber Feet 2 Press down gently on the unit to secure it onto the clip, The four self-adhesive rubber feet prevent your hub from moving around on your desk. Only stick the feet to the marked areas at each corner of the underside of your hub if you intend to place the unit directly on top of the desk. Do not fix the feet if you are going to use the clip.
Remove any connections to the hub and locate it over the screw heads. When in line, gently push the hub on to the wall and move it downwards to secure. When making connections, be careful not to push the hub up and off the wall. Positioning Your Hub When installing your OfficeConnect hub, ensure: ■ It is out of direct sunlight and away from sources of heat.
THE OFFICECONNECT ETHERNET HUB 4 AND 4C Ethernet Hub 4 and 4C—Front Alert LED Activity LED 10BASE-T Port Status LEDs Network Utilization LEDs (Hub 4C only) orange Alerts you to excessive network use or an isolated (partitioned) 10BASET port. (Hub 4 only) yellow Flashes each time a packet is received on a port. green/yellow Indicates the status of each 10BASE-T port. green — The link between the port and the next piece of network equipment is OK.
Ethernet Hub 4 and 4C—Rear 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. Connecting Workstations and Other Equipment to Your Hub WARNING: Please read the ‘Important Safety Information’ sheet before you start. Connecting Transceivers to the AUI Port You can connect a 10Mbps Ethernet transceiver to your hub (Hub 4C only), using a standard AUI cable.
Figure 4 Connecting Hubs Using 10BASE-2 Connect a 10BASE-2 ‘Y’ piece to each of your hubs (Hub 4C only). Connect the ‘Y’ pieces with 10BASE-2 cable to form a single segment, as shown in Figure 4. Remember to terminate the two free ends of the segment by fitting terminators (end pieces). Correct Hub Connections Using 10BASE-2 50 Ohm terminator AU I Up li No nk rm al To disconnect a 10BASE-2 cable, twist each connector counter-clockwise to unlock it, and remove it.
If you suspect there is a problem, refer to “Problem Solving for the Hub 4 and 4C” on page 15. Connecting Hubs Using 10BASE-T You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method, as shown in Figure 5: Figure 5 Correct Hub Connections Using 10BASE-T 1 Starting from the bottom, connect the port 4 of the Switch set to Normal (out) lower hub to port 3 of the hub immediately above. Repeat this for each hub.
PROBLEM SOLVING FOR THE HUB 4 AND 4C 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 do next. 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.
Port Status LED not lit for a 10BASE-T port that has a connection. There is a problem with this connection. Check that you are using a straight-through 10BASE-T cable which is properly connected at both ends, and is not damaged. If the cable is connected to port 4, ensure that the Uplink/Normal switch is set to Normal (out). Also check that the equipment being connected to the hub is powered on and operating correctly.
THE OFFICECONNECT ETHERNET HUB 8 AND 8C Ethernet Hub 8 and 8C—Front Alert LED Activity LED Port Status LEDs orange Alerts you to excessive network use or an isolated (partitioned) 10BASET port. (Hub 8 only) yellow Flashes each time a packet is received on a port. green/yellow Indicates the status of each port. green — The link between the port and the next piece of network equipment is OK. yellow — The port has partitioned due to a fault on that segment.
Ethernet Hub 8 and 8C—Rear 18
The hub detects all port connections, so you can start using your network immediately. When you need more ports, simply add more OfficeConnect hubs. Connecting Workstations and Other Equipment to Your Hub WARNING: Please read the ‘Important Safety Information’ sheet before you start. Connecting OfficeConnect Ethernet Hubs Together WARNHINWEIS: Bitte lesen Sie den Abschnitt ‘Wichtige Sicherheitsinformationen’ sorgfältig durch, bevor Sie das Gerät einschalten.
Figure 7 Connecting Hubs Using 10BASE-2 Correct Hub Connections Using 10BASE-2 Connect a 10BASE-2 ‘Y’ piece to each of your hubs (Hub 8C only). Connect the ‘Y’ pieces with 10BASE-2 cable to form a single segment, as shown in Figure 7. Remember to terminate the two free ends of the segment by fitting terminators (end pieces). To disconnect a 10BASE-2 cable, twist each connector counter-clockwise to unlock it, and remove it.
If you suspect there is a problem, refer to “Problem Solving for the Hub 8 and 8C” on page 22. Connecting Hubs Using 10BASE-T You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method, as shown in Figure 8: Figure 8 Correct Hub Connections Using 10BASE-T 1 Starting from the bottom, connect the port 8 of the lower hub to port 7 of the hub immediately above. Repeat this for each hub.
PROBLEM SOLVING FOR THE HUB 8 AND 8C 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 do next. loop. Each piece of equipment needs only one connection to your OfficeConnect hub. Port Status LED yellow for a 10BASE-T port.
Port Status LED not lit for a 10BASE-T port that has a connection. There is a problem with this connection. Check that you are using a straight-through 10BASE-T cable which is properly connected at both ends, and is not damaged. If the cable is connected to port 8, ensure that the Uplink/Normal switch is set to Normal (out). Also check that the equipment being connected to the hub is powered on and operating correctly.
NETWORKING TERMINOLOGY A Network is a collection of workstations (for example, IBM-compatible personal computers) and other equipment (for example, printers), connected for the purpose of exchanging information. Networks vary in size, some are within a single room, others span continents. A segment is the length of Ethernet cable connected to a port, whether this cable is 10BASE-T, 10BASE-2, or other type.
DIMENSIONS AND STANDARDS Dimensions and Operating Conditions Standards Functional: ISO 8802/3 IEEE 802.3 Safety: UL 1950 EN 60950 CSA 22.2 #950 IEC 60950 EMC: EN 55022 Class B† EN 55024 FCC Part 15 Class B†* ICES-003 Class B VCCI Class B† CNS 13438 Class A Environmental: EN 60068 (IEC 68) Various parts 225mm (9in.) 0-40°C (32-105°F) operating temperature 35.8mm (1.4in.) 0-90% (non-condensing) humidity 135.4mm (5.3in.) + 15.2mm (0.6in.) for 10BASE-2 port (if applicable) Power Weight 2.33 W 7.
ENVIRONMENTAL STATEMENTS It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we are committed to: End Of Life Statement 3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components. ■ Establishing environmental performance standards that comply with national legislation and regulations. Regulated Materials Statement ■ Conserving energy, materials and natural resources in all operations.
REGULATORY NOTICES VCCI STATEMENT 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.
Wall mounting screw hole guide 150 mm (5.
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