Introduction part 2 Essay - 3,071 words

... Very little delay is introduced by this quick movement of data across the repeater; thus two Class II repeaters are allowed per Fast Ethernet segment. Class I repeaters are slower (140 bit times for its round-trip delay) compared to Class II (92 bits times or less), but provide translation that ensures compatability. Class II repeaters, although faster, support only a single technology. Standard topologies for 100BaseT networks are one Class I repeater, which allow network diameter of 200 m using copper cable and stations that may be 100 m from the repeater, and two Class II repeaters. The latter are attached via a 5-m cable that provides a diameter of 205 m and stations that may be 100 m from each repeater. Wide-spread popularity of Fast Ethernet is accounted for its low cost implementation, excellent compatibility with most existing networks, besides Fast Ethernet is still Ethernet, with all it proved reliability and wide-spread popularity.


Due to the above reasons Fast Ethernet has become de facto standard in the industry. Gigabit Ethernet The growing use of high-speed LAN technologies created a need for an even higher speed network technology in the systems including desktop and beyond. Though Fast Ethernet did considerably boost network performance, it is still inadequate for the constantly increasing network traffic. Besides it has created a traffic jams at server connections, switch stacks, and other points of aggregation . Gigabit is the next development of Ethernet technology. The transfer rate of information is astonishing 1,000 Mega-bits per second (Mbps) , thereby increasing the speed of a 10Mbps or 100Mbps network by a factor of 100 or 10 respectively. Gigabit Ethernet uses many of the same technical standards as previous Ethernet versions, and therefore, represents logical and appropriate solution for upgrading the network. Intel and other networking vendors believed that Gigabit Ethernet had two advantages definite strong points to become next de facto standards in networking.


First, upgrading to Gigabit from previous Ethernet networks is relatively easy. Current users will be able to upgrade their Ethernet networks at reasonable cost without interrupting existing service. Secondly, Ethernet was traditionally an open technology. The Institute of Electronic and Electrical Engineers (IEEE) established standards for Ethernet, thereby permitting numerous vendors to market and distribute the technology, making it the standard for LANs. Initially, GE has three transmission media: long-wave laser over single-mode and multi-mode fiber (1000BaseLX), short-wave laser over multi-mode fiber (1000BaseSX), and balanced shielded 150-ohm copper cable (1000BaseCX). However, the acceptance of the 1000BaseT standards in 1999, has opened the existing copper infrastructure for widespread deployment of Gigabit . Now, organizations can utilize the copper cabling they already have in place to upgrade their LAN at a small cost. The fiber optics and balanced shielded cables can be employed at the following range: 1000BaseLX is suitable for long-distance transmissions of 200 meters, 1000BaseSX is suitable for shorter transmissions of 50 meters, and balanced shielded 150-ohm copper cable is suitable for intra-rack connections.


The current speed allowable over these types of media with GE is 1.25 Gbps half-duplex, and 2.50 Gbps fullduplex. GE has definite advantages in conquering networks compared with competing standards, like Asynchronous Transfer Mode. Cost of implementing and maintaining GE is undeniably lower, it is widely adopted, and closely resembles its predecessors, 10BaseT, and 100BaseT. No extra effort needed in making it compatible with other popular protocols, and virtually every network specialist is familiar with the existing Ethernet protocol. Compatibility with existing network and computer hardware is a tough issue for any newcomer, but not for GE. Already many organizations upgrade their networks using GE standard, addressing narrow points at server connections, boosting bandwidth of switch link and bringing down GE power down to workstations.


An increase in server capacities has enabled procession of increasingly larger files, which in turn creates jams over 100BaseT. This problem is more acute when the network involves a lot of server-to-server communication. Upgrading high-capacity servers with Gigabit NICs can spectacularly improve network traffic. With the price of Gigabit NICs averaging $200 , going with a 1000BaseT solution here provides the most performance enhancement for the money. Gigabit switch uplink solution can relieve an especially overloaded switched lines. The 1000BaseT standard provides high-bandwidth connectivity from desktop switches to servers.


A Gigabit solution here can help ensure smooth operations by moving traffic quickly from the back end to the front end. Endpoints of each segment may benefit greatly from deployment of Gigabit uplink switches. These uplink switches can be purchased at reasonable prices from various vendors, such as Cisco and 3-Com. The final level of GE employment is ultimately a desktop. Some organizations may find that more bandwidth is needed for high-performance workstations. As Gigabit adapters price goes steadily down, an increasing number of companies will consid ...................................................................................................................................................................................................................................................................................................................................................................

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Essay Tags: ethernet, gigabit ethernet, fast ethernet, fiber, bandwidth

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