3Com 3C16723A, 3C16721A Connecting 100BASE-TX Hubs, Connecting to 10BASE-T Networks, Spot Checks

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Connecting 100BASE-TX Hubs

You can connect two OfficeConnect hubs together, as seen in Figure 4, with 100BASE-TX in a number of ways, but for simplicity we recommend the following method:

1Connect the highest-number port (port 4 on Hub 4, port 8 on Hub 8, port 12 on Hub 12) of the lower hub to any port of the upper hub.

2Set the Uplink/Normal switch on the lower hub to Uplink (in). If you use the highest-number port of the upper hub ensure that its Uplink/Normal Switch is set to Normal.

Figure 4 Correct Hub Connections Using 100BASE-TX

Switch set to

 

Uplink/Normal

 

 

8

 

Normal (out)

 

 

 

Switch set to

 

 

 

Uplink (in)

 

 

 

 

 

 

1X

 

POWER

Uplink/Normal

 

 

 

 

 

 

100BASE-TX cable

1X

 

 

with RJ-45 connectors

 

Connecting to 10BASE-T Networks

Your OfficeConnect Hub can be connected to a 10BASE-T network through an OfficeConnect switch (for example, an OfficeConnect Dual Speed Switch 8).

Checking Hub Connections

When you have connected your hubs, power them on. The 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.

Spot Checks

At frequent intervals, visually check that:

The Alert LED is off — this is the best way to find out if there are problems with your network.

Case vents are not obstructed.

Cabling is secure and not pulled taut.

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Contents OfficeConnect Fast Ethernet Hub 4, Hub 8, Hub 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Introduction Creating Your Network Page Introduction Creating Your Network Fast Ethernet Hub 4 and Hub 8-Front100BASE-TX RJ-45 ports Power adapter socketFast Ethernet Hub 4 and Hub 8-Rear Alert LED Power LED Collision LED Fast Ethernet Hub 12-FrontUplink/Normal switch Fast Ethernet Hub 12-RearHub Connections Before You StartWorkstation Connections Stacking Clip Stacking the Units TogetherRubber Feet Positioning Your OfficeConnect Hub Securing Your HubExample Connecting Workstations and Other Equipment to Your HubConnecting OfficeConnect Hubs Together Checking Hub Connections Connecting 100BASE-TX HubsConnecting to 10BASE-T Networks Spot ChecksProblem Solving Straight-through Cable/Crossover Cable Networking Terminology OfficeConnect Fast Ethernet Hub Dimensions and StandardsDimensions and Operating Conditions Standards EMCRegulated 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, South Africa, and Middle East Country Telephone Number Asia, Pacific RimEurope Country Telephone Number Latin America North AmericaReturning Products for Repair Country Telephone Number Fax Number3Com Corporation Limited Warranty Warranties Exclusive Disclaimer Electromagnetic Compatibility Page Page Page Part No. DUA 1672-1AAA03 Published June

3C16723A, 3C16721A, 3C16722A specifications

The 3Com 3C16722A, 3C16721A, and 3C16723A are part of a series of networking devices designed to enhance network performance, reliability, and management capabilities in various environments. These devices are primarily used in enterprise networks, catering to different sizes and types of network infrastructures.

The 3C16722A is a high-performance Ethernet switch featuring 24 ports that support 10/100/1000 Mbps speeds. Its main features include auto-MDI/MDI-X capabilities, which automatically detect connections and configure the ports accordingly, facilitating seamless integration. This switch supports VLAN (Virtual Local Area Network) functionality, enabling network segmentation and improved security. With robust forwarding capabilities, the 3C16722A ensures efficient data transfer within a network, making it ideal for organizations that require high bandwidth for data-intensive applications.

The 3C16721A, while similar to the 3C16722A, is designed for users who require fewer ports but still demand high-speed connectivity. Offering 16 ports, the 3C16721A also operates at 10/100/1000 Mbps and incorporates advanced features such as Quality of Service (QoS) settings. QoS prioritizes critical network traffic, ensuring that voice and video data are transmitted with minimal latency, which is essential for businesses that depend on real-time communication tools.

Lastly, the 3C16723A combines the functionalities of both its counterparts but extends the port offerings to cater to larger networks. Featuring 48 ports, this switch can support multiple devices simultaneously, providing extensive connectivity options. Additionally, it offers stacking support, allowing multiple switches to operate as a single unit. This capability enables network administrators to manage larger systems more efficiently and simplifies the overall network architecture.

Each of these devices utilizes advanced technologies such as Spanning Tree Protocol (STP) for loop prevention and link aggregation to enhance throughput by combining multiple connections. Security features, including port security and access control lists, are also integrated to protect sensitive data and maintain network integrity. Overall, the 3Com 3C16722A, 3C16721A, and 3C16723A are versatile networking solutions that deliver performance, scalability, and security for modern enterprise networks.