tools for transmitting and receiving

REFER TO PAGES 182- 188

Data can be moved in two ways serial or parrallel.


SERIAL DATA TRANSMISSION: is a form on transferring digital infromation. in serial system, the digital data sent one bit and a time.
indivual data peieces running on the same line or transmission.
hence PARALLE DATA TRANMISSION consestes of more line...

**** controlling the flow

what is a full duplex? its the fastest and most efficent way yo controll the movement of data between system or devices.

half duplex allows data to move in both derections but not at the same time.

- simplex data links allow the data to move in only one derection in a simplex system there is no end to reciving transmission.
signal timming
-asynchronous communincation link has no set time data to be trasnmitted or recieved.
-synchronous communication links uses agreed times for data to be transmitted adn recieved

Data speed
the speed in which decuces send data to each other is another wital factor in communications links.
-baud
-bits per second
-broadband

Data and information

data is collected from the environment of an information system, it is relatvely raw and is basically unproessed facts or details, information results when the data is analysed by information system to give it meaning...

the seven infromation processes
(coast pd)
collecting- the process by dadt in entered into or captured by a computer system, including
-deciding what data is required
-how it is spurced
-how it is encoded for entry into the system
Organising- the process by which data is structured into a form appropriate fo the use of other informayion processes such as the format in which data will be represented
analysing- the process by which data is inperpreted, transforming it into information
storing and retrieving- the process by which data can be accsessed late
processing- a proedure that manipulates data and information
displaing- the process that contrils the format of information presented o the participant or use