How data is transmitted?

Assalamualaikum :)

Good evening all~

So, our interesting topic for today is "Data Transmission". In order for data to be transmitted, it needs to travel over a network. So, we are going to learn in what form it is transmitted, what is the amount of data could travel and what is the type, direction and timing of the transmission.

1. Analog vs. Digital

To make it simpler and easy to be understood, analog is an actual replication of sound wave or image. How it works to produce a continuous wave is (signals-frequency or amplitude, electromagnetic current with given frequency). 

Digital transmission convert signals into binary code (two elements 1,0 only). Therefore, the digital format is ideal for digital electronic communication. 

2. Bandwidth

The higher the bandwidth, the faster the data is delivered. So simple isn't it? :)

3. Serial vs. Parallel 

Serial ---> Data is transmitted bit by bit within a long single path. It is used for a short communication.

Parallel ---> Functions the same- one bit at a time but using different path. Parallel transmission is faster and being used for more telecommunication.

4. Transmission timing

You have to know how data is transmitted synchronously (organised by block) , asynchronously (data with bits specified), and isynchronously (data send at the same time as other data).

5. Transmission directions

Simplex

• one way communication (travel in single direction)
• uncommon in computer communication
• eg : door bell

Half Duplex

• two way but one direction at a time
• eg : walkie talkie and USB devices

Full Duplex

• data travel both direction at a time
• ideal for hardware devices that need to pass large amount of data
• eg : telephone, networks and internet connection

6. Circuit Switched, Packet Switched and Broadcast Connections

Circuit Switched

- there's a path that specifically made for data to travel 

Packet Switched 

- this one plays quite a same function with asynchronous (save into packets)

- data send as individual packet but assemble at recipients destination later

Broadcast Connections

- just like how BBM-broadcast messaging works, the data broadcasts and depends on whether the recipients want to take the data or not

Another thing that you need to know is "Data Compression" which is basically a useful communication because it enables devices to transmit or store the same amount of data in fewer bits.

How was that? Just a brief one? I know. I think that's enough for now. 

Till then. Bye~! :D

all images credit to : google images