3Com manual Creating Your Network, Dual Speed Hub 8-Front

Page 6

CREATING YOUR NETWORK

Dual Speed Hub 8—Front

Alert LED

Power LED

Collision LEDs

orange

green

yellow

Off when the Hub is operating

Indicates that

Flash each time a

correctly. Lit for a short period of

the power

collision is detected on

time after power on, for self test.

supply to the

the Hub's 100Mbps or

If the LED is continuously lit, there

Hub is

10Mbps segment.

may be a problem. Refer to the

present.

Collisions are a normal

“Problem Solving” section.

 

part of network

 

 

operation.

Port Status LEDs

green (top row:100Mbps; bottom row:10Mbps)

If the LED is on, the link between the port and the next piece of network equipment is OK. If the LED is off, nothing is connected, or the connected device is switched off, or there is a problem with the connection (refer to the “Problem Solving” section). If flashing, the port is partitioned, possibly due to a network loop.

Network Utilization LEDs

green/yellow/orange (top row:100Mbps; bottom row:10Mbps) Indicate how much the 100Mbps and 10Mbps segments of your network are being used.

 

 

 

 

 

 

Port Status

 

 

 

 

 

Network Utilization

 

 

 

 

100M

 

 

 

 

 

 

 

100M

 

 

 

 

 

 

 

100M

 

 

 

 

 

3

4

5

 

7

 

 

 

 

 

 

 

 

 

Collision

1

2

6

8

1%

2%

3%

6%

12%

25%

50%

80%

Alert

Power

10M

 

 

 

 

 

 

 

10M

 

 

 

 

 

 

 

10M

 

Green = OK Flash = Partitioned

 

 

 

 

 

OfficeConnect Dual Speed Hub 8

 

 

 

 

 

 

 

 

 

6

Image 6
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-RearTwisted Pair TP Cables Before You StartWorkstation Connections Hub ConnectionsStacking the Units Together Rubber FeetStacking Clip Positioning Your Hub Securing Your HubConnecting Workstations and Other Equipment to Your Hub Connecting Another OfficeConnect HubFast Ethernet 100Mbps Configuration Rules Ethernet 10Mbps Configuration Rules Example of an Ethernet 10Mbps NetworkMaking the Connection to Another Hub Checking Hub ConnectionsSpot Checks Problem Solving Straight-through Cable/Crossover Cable Networking Terminology Dimensions and Standards Dimensions and Operating ConditionsStandards Regulated Materials Statement Environmental StatementsEnd Of Life Statement Environmental Statement about the DocumentationImportant Safety Information Wichtige Sicherheitshinweise Consignes Importantes DE Sécurité Technical Support Online Technical Services3Com Knowledgebase Web Services 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.