Classification of Repeaters

3-9

Classification of

The IEEE 802.3 standard defines two classes of repeaters for 100BASE-T

Repeaters

Fast Ethernet networks, as detailed below.

Class I Repeaters A Class I repeater is a hub with internal delay such that only one repeater can exist between any two DTE (data terminal equipment) devices within a single collision domain when two maximum-length cable segments are used.

The LinkBuilder FMS 100-TX Hub (product number 3C250-TX/1) is a Class I device only.

Internal delay is the time delay between the sensing of the first data bit received and the sensing of the first bit transmitted on a 100 Mbps CSMA/CD network. Propagation time delays also affect repeater classification. Class I repeater delays are longer than Class II repeater delays.

A Class I network topology consists of one hub (or hub stack) in a single collision domain existing between any two end stations. The stack of LinkBuilder FMS 100-TX Hubs in this configuration can contain up to eight hubs.

Figure 3-8 shows a single collision domain containing one Class I hub stack between two end stations, with the distance between end stations being 200 meters. If one of the hub-to-node segments is implemented with fiber cabling (by using the 100BASE-FX transceiver interface module), the total span can be 260.8 meters. That is, up to 100 meters can consist of UTP cabling, with up to 160.8 meters of fiber cabling.

200 meters: maximum UTP distance

(260.8 meters: mixed UTP and fiber cable)

100 meters maximum

 

(160.8 meters: fiber cable)

100 meters maximum

Class I configuration

Figure 3-8 Class I Hub

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3Com 100 TX manual Classification, Repeaters
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100 TX specifications

The 3Com 100 TX is a leading networking device that revolutionized Ethernet connectivity in both small and large enterprise environments. As a part of the 3Com family, this device was designed to provide reliable and efficient network performance, supporting the growing demands of networking technologies in the late 1990s and early 2000s.

One of the main features of the 3Com 100 TX is its compliance with the 100BASE-TX standard, enabling rapid data rates of up to 100 Mbps. This makes it ideal for high-speed local area networks (LANs) that require swift data transfer among connected devices. The device effectively accommodates the increasing bandwidth needs brought on by resource-heavy applications and the proliferation of internet services.

The 3Com 100 TX employs a Category 5 cabling system, which is crucial in achieving optimal performance. This cabling type allows for improved signal quality and reduced crosstalk, particularly over longer distances. By integrating this technology, the 3Com 100 TX can maintain a reliable point-to-point connection, ensuring minimal packet loss and superior data integrity.

Another significant characteristic of the 3Com 100 TX is its innovative design, which facilitates easy installation and integration into existing network infrastructures. The device features auto-negotiation capabilities, allowing it to automatically detect and adapt to the speed and duplex settings of connected devices. This plug-and-play functionality minimizes configuration time, making it user-friendly for both seasoned network engineers and those new to networking.

In terms of network management, 3Com incorporated various tools to help administrators monitor and troubleshoot network performance efficiently. The device includes diagnostic indicators such as Link and Activity LEDs, providing real-time feedback on connection statuses. This aids in quick identification of potential issues or downtime, ensuring network reliability.

Overall, the 3Com 100 TX remains a noteworthy component in the evolution of Ethernet technology. Its exceptional speed, flexible cabling compatibility, and user-oriented design make it an enduring choice for businesses seeking to enhance their network infrastructure. By investing in such devices, organizations can achieve optimal connectivity, laying a strong foundation for a robust digital ecosystem.
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