3Com Hub manual Important Safety Information

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IMPORTANT SAFETY INFORMATION

WARNING: Warnings contain directions that you must follow for your personal safety. Follow all directions carefully.

You must read the following safety information carefully before you install or remove the unit:

■Exceptional care must be taken during installation and removal of the unit.

■Only stack the OfficeConnect hub with other OfficeConnect units.

■To ensure compliance with international safety standards, only use the power adapter that is supplied with the unit.

■The socket outlet must be near to the unit and easily accessible. You can only remove power from the unit by disconnecting the power cord from the outlet.

■This unit operates under SELV (Safety Extra Low Voltage) conditions according to IEC 950. The conditions are only maintained if the equipment to which it is connected also operates under SELV conditions.

■There are no user-replaceable fuses or user-serviceable parts inside the hub. If you have a physical problem with the unit that cannot be solved with problem solving actions in this guide, contact your supplier.

■Disconnect the power adapter before moving the unit.

WARNING: RJ-45 ports. These are shielded RJ-45 data sockets. They cannot be used as telephone sockets. Only connect RJ-45 data connectors to these sockets.

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Contents OfficeConnect Dual Speed Hub 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Introduction Creating your Network Page Small Network With OfficeConnect Hub IntroductionDual Speed Hub 8-Front Creating Your NetworkDual Speed Hub 8-Rear Power Adapter socketHub Connections Before You StartWorkstation Connections Twisted Pair TP CablesRubber Feet Stacking the Units TogetherStacking Clip Securing Your Hub Positioning Your HubConnecting Another OfficeConnect Hub Connecting Workstations and Other Equipment to Your HubFast Ethernet 100Mbps Configuration Rules Example of an Ethernet 10Mbps Network Ethernet 10Mbps Configuration RulesChecking Hub Connections Making the Connection to Another HubSpot Checks Problem Solving Straight-through Cable/Crossover Cable Networking Terminology Dimensions and Operating Conditions Dimensions and StandardsStandards Environmental Statement about the Documentation Environmental StatementsEnd Of Life Statement Regulated Materials StatementImportant Safety Information Wichtige Sicherheitshinweise Consignes Importantes DE Sécurité World Wide Web Site Online Technical Services3Com Knowledgebase Web Services Technical SupportSupport from 3Com Support from Your Network SupplierEurope North America Country Telephone Number Fax Number Returning Products for Repair3Com 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.
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