Transmission Modes
- Transmission mode, also known as communication mode, refers to how data is transferred from one device to another.
- It is also referred to as directional mode because each communication channel has a specific direction, often determined by the transmission media.
- Transmission mode is primarily defined within the physical layer of the network.
The transmission mode is categorized into three types:
- Simplex Mode
- Half - duplex Mode
- Full - duplex Mode
Simplex Mode
- Simplex mode facilitates unidirectional communication, where data flows in one direction only.
- Devices in simplex mode can either send or receive data, but not both simultaneously.
- This mode is less popular for communications requiring two-way data exchange.
- Utilized in scenarios like one-way sales transactions in business.
- Examples include radio stations transmitting signals to listeners and keyboards receiving input from users.
- Advantages of simplex mode include the full utilization of communication channel capacity during transmission.
Advantage of Simplex Mode
- In simplex mode, the station can fully utilize the bandwidth of the communication channel, allowing for the transmission of more data at once.
Disadvantage of Simplex Mode
- Communication in simplex mode is unidirectional, meaning there is no bidirectional exchange of data between devices.
Half - duplex Mode
- In half-duplex mode, stations can both transmit and receive data, but not simultaneously.
- Messages flow in both directions, one at a time, utilizing the entire bandwidth of the communication channel.
- Error detection is possible, with receivers requesting retransmission of data if errors occur.
- A walkie-talkie exemplifies half-duplex mode, where one party speaks while the other listens, and then roles switch.
Advantage of Half - duplex Mode
- In half-duplex mode, both devices have the capability to both send and receive data, allowing for the utilization of the entire bandwidth of the communication channel during data transmission.
Disadvantage of Half - duplex Mode
- In half-duplex mode, when one device is transmitting data, the other must wait, resulting in delays in sending data at the appropriate time.
Full - duplex Mode
- Full-duplex mode enables bidirectional communication, with data flowing in both directions simultaneously.
- Both stations can send and receive messages at the same time.
- Full-duplex mode consists of two simplex channels, each with traffic moving in opposite directions.
- Known for its speed, making it the fastest communication mode between devices.
- Commonly exemplified by the telephone network, where two parties can talk and listen simultaneously during a call.
Advantage of Full - duplex Mode
- Both stations have the capability to both send and receive data simultaneously.
Disadvantage of Full - duplex Mode
- If no dedicated path exists between the devices, the capacity of the communication channel is divided into two parts.
Different between Simplex, Half - duplex and Full - duplex mode
More topic in Computer Network
