Ethernet - (2)

Ethernet - (2)

Summary on What we have studied in last Tutorial ? :-

• Network involves connection of computers, Workstation and network devices such as routers, switches, and firewalls.
• Ethernet is most widely used Local Area Network ( LAN ) technology and is formally defines by IEEE 802.3 standard.
•  High speed Ethernet was developed in order to increase the connectivity speed between the terminals or computers in a particular network.
• Fast Ethernet is further sub-divided into two categories :- (1). Copper Cabled Ethernet & (2). Fiber Optic Cabled Ethernet.

# Fiber optic Ethernet :-

      Fibre cabled to Ethernet employes fibre optic cables for transmission of signals in which the electrical signals are converted to optical signals ( light signals ) for transmission through the cable which is made up of thin glass. These transmitted signals are again converted

from light to electrical signals at the receiver end.

     Types of cabling standards used for fibre optic cable are :-

• 100base-FX - Defines Fast Ethernet version over Optical Fibre. It uses two standards of multi-mode Optical Fibre to receive and transmit and uses long wavelength light source. 100Base-FX, which supports maximum cable length of 400 meters, is an enhanced version of 10Base-FL and it looks similar to 10Base-FL. Both use the same multi-mode fiber optic cables and SC or ST connectors.
• 100-Base-SX - Defiens Fast Ethernet version over Optical Fibre. It uses two standards of multi-mode Optical Fibre to receive and transmit. It uses less expensive short wavelength light source and other optical components.
• 100Base-BX - Refers to a version of fast Ethernet over a single strand of Optical Fibre that uses single-mode fibre for transmission of signal.

Fiber Optic Cable

The advantages of 100Base-T Ethernet are :-

• Speed - Ten times faster than regular 10Base-T Network.

• Throughput - Faster for video, Multimedia, Graphics, Internet Surfing and other Application that requires high speed.

• Error-Detection - Supports stronger error detection and correction.

• Cost - 100Base-T Ethernet hardware is slightly costlier than 10Base-T hardware.

• Installation - Easy to Install and Maintain.

Disadvantages of 100Base-T Ethernet are :-

• Mode of Data Transfer - 100Base-T4 cannot support full Duplex mode of Data Transfer

• Wiring - 100Base-T4 requires four pair of wiring for Data Transfer.

• Category of Cable - 100Base-TX Ethernet requires CAT 5 cables for all patch panel and Jumper Blocks.

• Switch Requirements - The full Duplex mode operation of 100Base-TX Ethernet requires full Duplex Switches.

(1.2) Gigabit Ethernet :-

      1000Base-X is the first version published by the 802.3z standard. It is divided into a number of standards such as 1000Base-CX, 1000Base-SX and, 1000Base-LX. The 802.3ab standard defines a single UTP solution called 1000Base-T. Out of these standards, 1000Base-T is the most popular Gigabit Ethernet Standard. Gigabit Ethernet Provides speed of 1000Mbps.
      It transmits data over UTP category 5e, or 6 cabling.Gigabit Ethernet is divided into following standards.

• 1000Base-SX - Fiber optic Gigabit Ethernet standard which operates over multi-mode (LED) fiber using 850 nanometer and the maximum cable length is 500 meters.

• 1000Base-LX - Fiber optic Gigabit Ethernet standard which operates over single-mode (laser) cables and sends data upto 5 kilometers. Sometimes special repeaters are used to increase distance upto 70 kilometers.

• 1000Base-T - Specifies a standard for Gigabit over Copper wiring. It requires minimum Category 5 cable. But, Category 5e and Catogery 6 cable may also be used and often recommended.

• 1000Base-TX - Created and and promoted by Telecommunicaions Industry Association (TIA) is a version of 1000Base-T. 1000Base-TX is simpler to implement and requires Category 6 Cable.

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