My class reflection: Week two- Data Communication

Today is week 2 of the class and today we learn about data communication. ^^

It is basically define as

collection and distribution of electronic information to and from remote facilities by means of electrical transmission system.

Some of the communication devises include telephones lines, satellites or coaxial cable

Information need to be converted into signal understood by the media so that data can be transmitted. There are 2 types of signal : Analog vs Digital

Analog signal needs to be converted to digital signal of binary digit 0 and 1 as it is the language of computer. This process is called modulation while the reverse is called demodulation

Binary digit is the smallest unit of measurement in digital and it consist of 0 and 1.

8 bits = 1 byte
1024 /1000 bytes = 1 kilobyte
1000 kilobytes = 1 megabyte
1000 megabytes= 1 gigabyte

Parallel transmission is the transfer of data simultaneously while in series transmission, each bits is transfer after one another using the same line. For this reason, it is slower than parallel transmission.

There are three types of data flow ; Simplex, Half - Duplex and Full Duplex.

Simplex

transmission in one direction only
no interaction between both receiver and transmitter as their role is fixed
etc: TV, radio

Half- Duplex

Message can flow in 2 direction but never at the same time
One station transmit info to another without interruption and the other station will respond after the transmission is complete.
etc: Walkie- talkie

Full- Duplex

Both station can transmit and receive signal at the same time. It is the most interactive way of communication among the three.
etc: telephone line, tele- conference