by Dinesh Thakur Category: Communication Networks

With the advancement of time and intensive use of LAN, more workstations and more active users have resulted in more LAN traffic. Increased use of graphics and other bandwidth-intensive applications have increased LAN traffic. Other applications like video conferencing and multimedia have created a demand for fast LANs. Bandwidth of 10 Mbps, 16 Mbps and even 20 Mbps are becoming bottleneck. In response to this, Fast LANs have been developed, offering bandwidth of 100 Mbps and soon to 1 Gbps. Fast LAN options currently include:

100Base T 

100BaseT is a high-speed LAN standard and is considered a variation of 10BaseT.This is standardized as IEEE 802.3u. This operates with an access mechanism as CSMA/CD and provides a transmission speed of 100 Mbps through an Ethernet switching hub. Multiple 10 Mbps connections are supported through multiple ports on the switch. Cat 3, 4, or 5 UTP can be used in 4-pair configuration. Cat 5 UI'P is generally used for a maximum LAN diameter of 500 meters.

Three pairs are used for transmission, with the fourth pair used for signaling and control (CSMA/CD) in half duplex mode. Connections to nodes, servers and other switching hubs are provided at 100 Mbps, supporting ten 10-Mbps channels. The 100 Mbps media include fiber (up to 30 miles or 50 km without repeaters) and Cat 5 UTP at 100 meters.

Type of 100Base T 

The 100BaseT can be divided into 100BaseTX, 100BaseT4 and 100BaseFX, depending on the type of transmission media used as explained above. Two pair category 5 UTP, four pair category 3 UTP and optical fiber cable are used for 100BaseTX, 100BaseT4 and 100BaseFX, respectively. This standard has been defined in IEEE802.3u.

                         100BaseTx Hardware Configuration

The hardware configuration of 100BaseTx. As with 100Baset, terminals are connected to the hub with 100BaseTx.CatS UTPs are used for connection. 100BaseTx has been developed based on 10BaseT to enable a higher transmission speed, vendors can readily develop peripheral equipment for 100BaseTx. Virtually, all hubs and NICs for 100BaseTxcan also be used for 10BaseT.

The hardware configuration of 100BaseT4. It is same as that for 100BaseTx. Cat3 UTPs are used for connection. Although originally intended for use as transmission lines at 10Mbps, cables of this type now offer a transmission speed of 100 Mbps as a result of special arrangements, including improved signal processing and simultaneous use of three out of four pairs for transmission or reception. This enables the trouble free introduction of a 100 Mbps LAN without the need to replace 10BaseT cables. However, these cables must be four pair cables.

The hardware configuration of 100BaseFx. The SC connector that is a push-lock type is recommended for use as an interface connector. However, some other connectors including the ST connector are also defined as options. Two fiber cables one for transmission and the other for reception are required for each connection.

                                         100BaseFx Hardware Configuration

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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