DATA TRANSMISSION

The factors that will affect the data tansmission :
  ( 1 )  Bandwidth
  ( 2 )  Protocols

Bandwidth

~Measurement of the width or capacity of the communication channel.

~The amount of information that can be sent through a connection between two computers in a given amount of time.

~Computers may be connected by telephone wires, by coaxial cable, or through radio waves or microwaves.

~A connection that can be transmit more data in a shorter period of time is said to have more bandwidth than another, slower connection.

~To get more information about brandwidth, please refer to http://wiki.answers.com/Q/What_is_the_definition_of_bandwidth_in_data_transmission

 

~There have 4 types of brandwidth :

   1)  Voiceband

        -- also know as low bandwidth.

        -- used for standard telephone communication. Microcomputers with telephone modems & dail-up service use this bandwidth.

        -- Transmission of text documents it is too slow for many types of transmission, including high-quality audio & video.

 

   2)  Medium band 

        -- connect microcomputers and mainframes to tansmit data over long distances.

        -- capable for high-speed data transfer.

        -- for more informations please refer to http://en.wikipedia.org/wiki/Medium_wave

   

   3)  Broadband

        -- widely used for DSL, cable, & satallite connect to internet.

        -- use single broadband connection to high-speed data transfer.

        -- used consistently with different types of internet connections.

        -- For more informations, please refer to http://en.wikipedia.org/wiki/Broadband , 

http://www.tech-faq.com/broadband.html

 

 

                                                         http://blog.irwan.name/?p=209

 

   4)  Baseband

        -- weidely use by those individual computers are located close to one another.

        -- able to suppoert to high-speed transmission.

        -- only can carry a single signal at one time.

        -- the information could also be carried in analog form.

        -- For more informations, please refer to http://www.tech-faq.com/baseband.html

 

 

Protocols

~Data transmission to be sucessful, sending and receiving devices must follow the set of communication rules for exchange of informations.

~Standard protocol for the Internet is TCP/IP (transmission control protocol/Internet protocol)

~Protocols may include signaling, authentication and error detection and correction capabilities.

~A protocol describes the syntax, semantics, and synchronization of communication and may be implemented in hardware or software, or both.

~For more informations, please refer to http://en.wikipedia.org/wiki/Communications_protocol

~The 2 features of protocol is :

  1) Identification

      -- Each computer have unique numeric address called an IP address(Internet Protocol address)

      -- Numerical addresses are difficult to use & remember, a system are automatically convert text-based addresses to numeric IP addresses.This system are call domain name server(DNS).

 

  2)  Packetization

      -- Informations there are transmitted across internet through numerous interconnected networks.

      -- Before the information are sent, it is reformatted or broken down into small parts called packets.

      -- Each information will sent separately.

      -- At the receiving end, the packets are reassembled into the correct order. 

 

 

http://www.maximumpc.com/article/news/border_gateway_protocol_a_gaping_security_hole_internet

 

 

 

Citations :

- More of the information are from Computing Essentials Complete 2010

- http://wiki.answers.com/Q/What_is_the_definition_of_bandwidth_in_data_transmission

- http://en.wikipedia.org/wiki/Medium_wave

- http://en.wikipedia.org/wiki/Broadband 

- http://www.tech-faq.com/broadband.html

- http://www.tech-faq.com/baseband.html

- http://en.wikipedia.org/wiki/Communications_protocol