Transmission modes


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signals,types of signal,duplex


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Contents :

Contents Transmission mode. Types of transmission mode. Signal. Analog signal and Digital signal. Data transmission. Parallel or Serial transmission. Asynchronous or Synchronous transmission.

Transmission mode:

Transmission mode Transmission mode defines the direction of the flow of information between two communication devices.

Types of Transmission Modes :

Types of Transmission Modes Simplex Half-duplex (HDX) Full-duplex (FDX)

Simplex mode:

Simplex mode In simplex transmission mode information is sent in only one direction. sender Receiver Only one way

Half duplex (HDX):

Half duplex (HDX) In half-duplex transmission data can be sent in both the directions but only in one direction at a time. sender Receiver Both ways, but only one way at a time

Full duplex (FDX):

Full duplex (FDX) In full-duplex transmission, data can be sent in both the directions simultaneously Sender Receiver BOTH WAYS SIMULTANEOUSLY

Signal :

Signal Electrical signal is represented as a change in voltage over time. In Computer networking information flows from one system to anther in the form of signal.

Analog Signal:

Analog Signal An analog signal is a continuous wave form that changes smoothly over a time.

Characteristics of Analog Signal:

Characteristics of Analog Signal Amplitude:-it refers to the height of the signal. It is equal to the vertical distance from a given point on the waveform to the horizontal axis.

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Period:-it refers to the amount of time in which a signal completes one cycle. It is measured in seconds.

Digital signal:

Digital signal A digital signal is a discrete form. Digital signal are represented by square wave. 1 1 1 0 0 0

Characteristics of digital Signal:

Characteristics of digital Signal Bit interval:-it is the time required to send one single bit. Bit rate:-it refers to the number of bit intervals in one second. therefore bit rate in one second. Bit rate is expressed in bits per second (bps).

Data Transmission:

Data Transmission Data Transmission refers to the movement of data in form of bits between two or more digital devices.

Types of Data transmission:

Types of Data transmission Parallel Transmission Serial Transmission.

Parallel Transmission:

Parallel Transmission In parallel transmission, all the bits of data are transmitted simultaneously on separate communication lines. sender Receiver 1 1 1 0 0 0

Parallel Transmission:

Parallel Transmission Advantage:- Speed :-multiple bits are transmitted simultaneously with a single line. Disadvantage :- Costly :-because it require n lines to transmit n bits at a time.

Serial Transmission:

Serial Transmission In Serial Transmission, the various bits of data are transmitted serially one after the other. Sender Receiver Single line

Serial Transmission:

Serial Transmission Advantages :- Use singe transmission line. Disadvantage:- Slower:-because bits are transmitted serially and after the other

Asynchronous Transmission:

Asynchronous Transmission Asynchronous transmission sends only one character at a time where a character is either a letter of the alphabet or control character.

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Bit synchronization between two devices is made possible using start bit and stop bit. 1 1 1 1 1 1 0 0 0 0 0 Start bit Stop bit data

Synchronous Transmission:

Synchronous Transmission Synchronous transmission does not use start or stop bits. In synchronous transmission, the two units share a common clock frequency and bits are transmitted continuously at the rate dictated by the clock pulse.

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Advantage:- The method is faster as compared to asynchronous as there are no extra bits and also there is no gap between individual data bytes. Disadvantage Costly:-it requires local buffer storage at the two ends of line it assemble blocks.

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