Basics of Data Communication

Satisfactory Essays
COMPUTER NETWORKS - CS65

Department of EEE,MEPCO

Page 2

Data communications (Datacom) is the engineering Datacom) discipline concerned with the communication between devices. A network is a set of devices (often referred to as nodes) nodes) connected by communication links. links. A computer network is any set of computers or devices connected to each other via some form of transmission medium with the ability to exchange data. Here information is presented in a form which is agreed upon by the parties creating and using the data. A computer network must be able to meet a certain number of criteria. The most important of these are criteria. Performance : measured in “throughput” & “delay” Reliability : measured by the frequency of failure or time taken by the link to recover from failure. failure. Security : protecting from unauthorized access or damage
January 25, 2011

BASICS OF DATA COMMUNICATION

Page 3

Page 4

- Direct – Simple and directly connected COMPONENTS Five components of communication 1. Message 2. Sender 3. Receiver 4. Transmission Medium 5. Rules to be followed for communication(Protocol)
DIRECT NETWORK

- Indirect – Two entities must depend on the functioning of other entities to exchange data. All the entities may be within a group or two or more group.

January 25, 2011

January 25, 2011

Prepared by Dr.S.Muralidharan

1

COMPUTER NETWORKS - CS65

Department of EEE,MEPCO

Page 5

Page 6

PHYSICAL TOPOLOGY : Refers to the way in which a network is laid out physically. Two or more devices connect to a link; two or more links form a topology. A fully connected mesh topology (five devices)

January 25, 2011

January 25, 2011

Page 7

Page 8

Advantages :
• • • •

A star topology connecting four stations

Dedicated connection between a pair of computers guarantees the congestion free data transfer Failure of one link does not affect the data transfer Each message travels through dedicated path.

You May Also Find These Documents Helpful

  • Satisfactory Essays

    STRATHMORE UNIVE ERSITY FACULT OF INFO TY ORMATION TECHNOLOGY ACHELOR O SCIENC IN TELEC OF CE COMMUNIC CATIONS BA BTC 120 Basic Dat and Voice Communica 02: ta ations DATE: 13th March 20 3 012 Instructio ons: Answer q question 1 and any other t questions d two s All Quest tions carry 20 marks each HRS TIME: 2 H QUESTIO 1 (COMPULSORY) ON a. Match the followin functions t a layer of th OSI model h ng to he i. ii. iii. iv. v. (5 Marks) Reliable pr rocess-to-process…

    • 1046 Words
    • 5 Pages
    Satisfactory Essays
  • Better Essays

    Data Communications

    • 6424 Words
    • 26 Pages

    used, a high voltage on a communications medium can represent a logical 1 and a low voltage of can represent a logical 0. Different methods of encoding exist these are used for different types of communication between electrical devices. Distortion, noise, and cross talk on a cabling medium are factors that prevent the accuracy of transmitted data to be intact. For these reasons different encoding methods exist. An example is when 2 wires are used to transmit music data to a speaker Digital signals…

    • 6424 Words
    • 26 Pages
    Better Essays
  • Satisfactory Essays

    Data Communications

    • 469 Words
    • 2 Pages

    Introduction Data communications (Datacom) is the engineering discipline concerned with communication between the computers. It is defined as a subset of telecommunication involving the transmission of data to and from computers and components of computer systems. More specifically data communication is transmitted via mediums such as wires, coaxial cables, fiber optics, or radiated electromagnetic waves such as broadcast radio, infrared light, microwaves, and satellites. Data Communications = Movement…

    • 469 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    data communication

    • 640 Words
    • 3 Pages

    What is Data Communications? Next Topic | TOC The distance over which data moves within a computer may vary from a few thousandths of an inch, as is the case within a single IC chip, to as much as several feet along the backplane of the main circuit board. Over such small distances, digital data may be transmitted as direct, two-level electrical signals over simple copper conductors. Except for the fastest computers, circuit designers are not very concerned about the shape of the conductor or…

    • 640 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Data Communication

    • 6574 Words
    • 27 Pages

    for67757_fm.fm Page i Saturday, January 7, 2006 12:00 AM DATA COMMUNICATIONS AND NETWORKING for67757_fm.fm Page ii Saturday, January 7, 2006 12:00 AM McGraw-Hill Forouzan Networking Series Titles by Behrouz A. Forouzan: Data Communications and Networking TCP/IP Protocol Suite Local Area Networks Business Data Communications for67757_fm.fm Page iii Saturday, January 7, 2006 12:00 AM DATA COMMUNICATIONS AND NETWORKING Fourth Edition Behrouz A. Forouzan DeAnza College with…

    • 6574 Words
    • 27 Pages
    Satisfactory Essays
  • Powerful Essays

    Basic Communication

    • 2013 Words
    • 9 Pages

    INTRODUCTION These days, communication plays an important part in every job; it is the focus of many careers. The need for communication skills is important in virtually every career, not just those that are traditionally stared as people-oriented. The process of communication is more than the total of number of people involved, understanding them could help clarify what happens when one person stabs to express an idea to others. Communication can be defined as the process by which a message or…

    • 2013 Words
    • 9 Pages
    Powerful Essays
  • Good Essays

    data communications

    • 17792 Words
    • 115 Pages

    CHAPTER 12 ROUTING IN SWITCHED NETWORKS A NSWERS TO Q UESTIONS 12.1 The average load expected over the course of the busiest hour of use during the course of a day. 12.2 The tradeoff is between efficiency and resilience. 12.3 A static routing strategy does not adapt to changing conditions on the network but uses a fixed strategy developed ahead of time. With alternate routing, there are a number of alternate routes between source and destination and a dynamic choice of routes is…

    • 17792 Words
    • 115 Pages
    Good Essays
  • Satisfactory Essays

    Data Communication

    • 758 Words
    • 4 Pages

    02. Compare and contrast between the bus and star topology.  A network architecture in which a set of clients are connected by a shared communications line, called as a bus.  A network consists of one central switch, hub or computer which acts as a conduit to transmit messages, called as a star.  Bus networks are the simplest way to connect multiple clients, but often have problems when two clients want to transmit at the same time on the same bus.  The star topology is a computer…

    • 758 Words
    • 4 Pages
    Satisfactory Essays
  • Good Essays

    Data and Communication

    • 1200 Words
    • 5 Pages

    Databases and Data Communication BIS 320 September 16, 2013 Lisa Ricks Databases and Data Communication Databases are great when you want to create a model of data such as numbers for figuring out how much you can spend on a new home when you are in the buying marketing, you can use excel to figure out how much you can spend and a monthly payment. You can also use a database to track of shipping components from a trade show that you are in charge of. You can use a database to organize…

    • 1200 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Data Communications

    • 1027 Words
    • 5 Pages

    its bandwidth. What is attenuation? Define channel capacity. What key factors affect channel capacity? Problems: Figure 1 shows the frequency domain function for a single square pulse. The signal pulse could represent a digital 1 in a communications system. Note that an infinite number of higher frequencies of decreasing magnitudes is needed to represent the single pulse. What implication does that have for a real digital transmission system? Suppose that a digitised TV picture is to be…

    • 1027 Words
    • 5 Pages
    Good Essays