3Com manual Before You Start, Workstation Connections, Twisted Pair TP Cables, Hub Connections

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Before You Start

Your OfficeConnect hub comes with:

One power adapter for use with the OfficeConnect hub.

A Product Registration card for you to fill out and return.

Four rubber feet.

A stacking clip.

Two unit labels and eight cable ties.

An OfficeConnect Network Assistant CD-ROM.

The extra parts mentioned in the next section are not supplied with the hub.

Workstation Connections

To connect workstations or other equipment to your hub, you need:

1One 10BASE-T,

10/100BASE-TX, or

3

100BASE-TX adapter card

 

for each workstation. 3Com

2

produce a range of

1

 

easy-to-install network

 

adapter cards, which

provide your workstations with a suitable connection.

2An operating system (for example, Netware or Windows 95/98) with network support configured, running on your workstations.

3One suitable TP cable for each workstation.

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...

Twisted Pair (TP) Cables

To connect your workstations and other equipment to the Hub, use ‘straight-through’ TP cables with RJ-45 connectors (all OfficeConnect products use RJ-45 type connectors). A ‘straight-through’ cable is one where each pin of one connector is connected to the same pin of the other connector. Cables can be shielded (screened) or unshielded; we recommend that you use shielded cable. Cables used for 100BASE-TX or 10/100BASE-TX connections must be data grade (Category 5). Your supplier should stock suitable cables.

The maximum length of a single cable is 100m (328ft). Refer to “Fast Ethernet (100Mbps) Configuration Rules” on page 11 for further information on cable lengths in a 100Mbps network.

Hub Connections

To connect other OfficeConnect units to your Hub, you need one suitable TP cable for each unit.

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Contents OfficeConnect Dual Speed Hub 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Introduction Creating your Network Page Introduction Small Network With OfficeConnect HubCreating Your Network Dual Speed Hub 8-FrontPower Adapter socket Dual Speed Hub 8-RearBefore You Start Workstation ConnectionsTwisted Pair TP Cables Hub ConnectionsStacking Clip Stacking the Units TogetherRubber Feet Positioning Your Hub Securing Your HubFast Ethernet 100Mbps Configuration Rules Connecting Workstations and Other Equipment to Your HubConnecting Another OfficeConnect Hub Ethernet 10Mbps Configuration Rules Example of an Ethernet 10Mbps NetworkSpot Checks Making the Connection to Another HubChecking Hub Connections Problem Solving Straight-through Cable/Crossover Cable Networking Terminology Standards Dimensions and StandardsDimensions and Operating Conditions Environmental Statements End Of Life StatementRegulated Materials Statement Environmental Statement about the DocumentationImportant Safety Information Wichtige Sicherheitshinweise Consignes Importantes DE Sécurité Online Technical Services 3Com Knowledgebase Web ServicesTechnical Support World Wide Web SiteSupport from Your Network Supplier Support from 3ComEurope North America Returning Products for Repair Country Telephone Number Fax Number3Com Corporation Limited Warranty Warranties Exclusive Disclaimer Electromagnetic Compatibility Wall mounting screw hole guide 142mm 5.6in Part No. DUA 1675-0AAA03 Published June

Hub specifications

3Com Hub: A Cornerstone of Early Networking Technology

The 3Com Hub represents one of the pioneering devices in the realm of computer networking. Developed by 3Com Corporation in the late 1980s, it played a significant role in facilitating communication within local area networks (LANs). As an essential component during the rise of networked computing, the 3Com Hub laid the groundwork for the development of more advanced networking technologies that followed.

One of the main features of the 3Com Hub is its ability to connect multiple devices within a network in a straightforward manner. Operating primarily at the data link layer (Layer 2) of the OSI model, the hub allows for the interconnection of computers, printers, and other network devices using twisted-pair Ethernet cables. Typically available in 8, 16, or 24 ports, it offered scalability to organizations as they expanded their networks.

The hub operates using Ethernet technology, which was evolving rapidly at the time. It effectively transmitted data packets by broadcasting signals to all connected devices. While this method is simple and efficient for smaller networks, it also means that bandwidth is shared among all devices. This mechanism could lead to collisions when multiple devices attempted to send data simultaneously, a common limitation during the era of hubs.

In terms of characteristics, the 3Com Hub is a plug-and-play device, meaning it requires no complex configuration. This ease of installation was particularly advantageous for organizations that were just beginning to adopt networking technologies. The hub also supported a variety of Ethernet standards, including 10BASE-T and 100BASE-T, allowing for flexible implementation as network requirements evolved.

3Com hubs were designed with durability in mind, with a robust chassis that could withstand the rigors of office environments. They typically featured LED indicators for power and link status, providing users with immediate feedback about the operation of the network. Although modern networking has moved toward switches and routers that provide greater efficiency and intelligence, the 3Com Hub remains an iconic representation of early networking solutions.

In conclusion, the 3Com Hub played a vital role during the formative years of computer networking, providing the foundation for many of the technologies that dominate today’s networks. While it may seem primitive in the context of advanced networking options available today, its influence on the development of LAN technologies is undeniable. As organizations continue to navigate the evolution of networking, the legacy of the 3Com Hub endures.