1 / 18

Punjab College Of Technical Education

Punjab College Of Technical Education. Presentation of Computer Networks. Topic: “Aloha & Sonet ”. Submitted To:- Submitted By:- Mr. Navdeep Bhandari Aman Bassi

bevan
Download Presentation

Punjab College Of Technical Education

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Punjab College Of Technical Education Presentation of Computer Networks Topic: “Aloha & Sonet” Submitted To:- Submitted By:- Mr. NavdeepBhandariAmanBassi (Faculty, I.T. Deptt.) GurleenKaur GurpreetKaur (BCA2A)

  2. Sub Topics: 1. ALOHA 1.1 Introduction 1.2 Overview 1.3 Aloha Protocol 1.4 Types of Aloha 1.4.1 Pure Aloha 1.4.2 Slotted Aloha 1.5 Aloha Throughtput 2. SONET 2.1 Introduction 2.2 Architecture 2.3 Advantages 2.4 Sonet Protocol 2.5 Basic Frame

  3. INTRODUCTION • World ‘s First computer communication N/W using low cost ham like radios, named ALOHA net. • First Functioning network in the USA • Conceived & Implenmented at the University of Hawaii Campus at MANOA • Purpose was to link the University mainframe Computer to client Computers

  4. OVERVIEW. . . . . . • Created in 1970 by Norman Abramson • Idea was to Use low cost amateur radio like system to create C/N. • Original version of ALOHA used two distinct frequencies in a hub/star configuration • Used a shared medium for transmission

  5. ALOHA PROTOCOL. . . . . • An OSI layer 2 protocol for LAN networks with broadcast topology • Two Conditions • 1. If you have a data to send, send the data • 2. If the message collides with other transmission, try resending “later”

  6. TYPES. . . . Pure Aloha Pure Aloha Vulnerable Time = 2 x Tfr

  7. 2. Slotted Aloha Slotted Aloha Vulnerable Time = Tfr

  8. SONET (Synchronous Optical Network ) • A Multiplexing Protocol for transferring multiple digital bit streams using laser or LED. • Basically a TDM • Supports both electrical & Optical signal • Is a set of standards for interfacing OTC optical networks. • Implemented for long haul traffic

  9. Sonet Transmission Network is composed of several pieces of equipment, including: • Terminal multiplexer (TM) • Add-drop multiplexer (ADM) • Repeater • Digital cross-connect system (DCS)

  10. Architecture In SONET • The architecture used in SONET technology is SONET rings, known as "self-healing rings,“. • use two or more transmission paths between network nodes, which are typically digital cross-connects (DCSs) or (ADMs). Two Fiber Unidirectional

  11. Two Fiber Bidirectional

  12. Four Fiber Bidirectional

  13. ADVANTAGES • Higher speed • Provides advanced network management and maintenance features • flexibility to accommodate any networks • used in the three traditional telecommunications areas: • 1. Long haul networks • 2. Local Networks • 3. Loop Carriers

  14. SONET Protocol: Consist of Four Layer Photonic layer Section layer Line layer Path layer

  15. THE BASIC FRAME 3 basic parts to each frame Section overhead Line overhead Synchronous payload To Conclude. . . .

  16. REFERENCES  1. Kuo, Franklin F (1973). "The ALOHA system" in Computer Networks. Prentice-Hall. pp. 501–518.  2. Kuo, Franklin F (1995). "The ALOHA system". ACM Computer Communication. 3. International Engineering Consortium SONET Tutorial, undated, URL retrieved on 21 April 2007. Thanks

More Related