HUB – AMPLIFIER - REPEATER

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Presentation transcript:

HUB – AMPLIFIER - REPEATER Computer Networks HUB – AMPLIFIER - REPEATER By Harsh Seksaria(1741122) Mohnish Vedi(1741135) Rajesh Patel(1741140)

HUB Ethernet was invented in 1973 by Bob Metcalfe Connect multiple ethernet devices together Multiple input-output ports Broadcasting by nature Signal introduced at input of any port appears at output of every port except the original incoming port Sends frames to all devices on a network

HUB Advantages Disadvantages Historically, main reason for purchasing hubs was their price Hubs are generally easy to install and maintain A good option for home networking Disadvantages A frame is passed along or "broadcast" to every one of its ports which results in unnecessary traffic This places a lot of traffic on the network and can lead to poor network response times

Uses of Hub Hubs are used to create small Home Networks Hubs are used in Organizations and Computer Labs for connectivity It Makes one device or peripheral available throughout the whole network

AMPLIFIER An amplifier is an electronic device that can increase the power of a signal

Input Signal Output Signal Working of Amplifier

REPEATER Repeater is a device that receives a signal and retransmits it. Repeaters work at the physical layer of OSI model. Used to extend transmissions so that signal can cover long distances Some types of repeaters broadcast an identical signal, but alter its method of transmission It consists of three components – receiver, frequency converter and transmitter.

LAN

REPEATER Advantages Disadvantages Easily extend the length of the network No overhead processing, so very little performance degradation(if any) It can connect signals from same network type that uses different types of cables Disadvantages Does not support connection of different network architecture. Number of repeaters between two ends should be limited.

How is Hub and Repeater related? A repeater and a hub both work on the Physical Layer of the OSI Model. A Hub is essentially a multiport repeater. Both are very “dumb” devices (no offense to any of you repeaters out there).

How is Repeater different from Amplifier?

Amplifier is used to magnify a signal, whereas repeater is used to receive and retransmit a signal with a power gain. Repeater has an amplifier as a part of it. Sometimes, amplifiers introduce some noise to the signal, whereas repeaters contain noise eliminating parts.

Thank You