We have learnt about the cables earlier. Once these cables are connected to the devices, they carry electric charge. We are also aware that the data is transmitted in the form of binary numbers, ones and zeroes. These ones and zeroes are sent through a process called Modulation. Modulation is the way altering the voltage of the charge moving in the cables. The kind of modulation used in the computer networks is specifically termed as line coding. The devices on the end can interpret the signals based on the state of certain charge as one and other as zero.

The process of transmitting data between the two devices or the communication between the two devices can be termed as Transmission. Transmission mode is also known as Communication mode. Networks are created to allow communication between the devices.

Before we go to the types of transmission modes, a small note. The most common type of cabling used for connecting computing devices is known as twisted pair, as it have pairs of twisted copper wires. Their twisted nature helps protect against electromagnetic interference and crosstalk from neighbouring pairs. 

Types of transmission Modes:

• Simplex Communication: The data flow here is uni-directional, as a one-way. The devices connected can either send or receive data, but not both. Through this, the entire cable can used for transmission. Ex: Keyboard can only send input.
• Duplex Communication: The data flow here is bi-directional. The way networking cables ensure that duplex communication is possible is by reserving one or two pairs for communicating in one direction. They then use the other one or two pairs for communicating in the other direction.
  • If the communication can occur from both the sides at a time. it is full duplex communication. Ex: Telephone.
  • If only one device can communicate at a time, then it is said to be half duplex communication. Ex: Walkie-talkie.

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