Classification of Modems
Modem word came from the combination of two words modulator and demodulator. A modem is a hardware device that enables the computers to transmit data over cable or satellite connection.A…
Types of Modems
• Modems can be of several types and they can be categorized in a number of ways. • Categorization is usually based on the following basic modem features: 1. Directional…
What is a Modem?
Modem is abbreviation for Modulator – De-modulator. Modems are used for data transfer from one computer network to another computer network through telephone lines. The computer network works in digital mode, while analog technology is…
Quadrature Phase Shift Keying
The Quadrature Phase Shift Keying QPSKQPSK is a variation of BPSK, and it is also a Double Side Band Suppressed Carrier DSBSCDSBSC modulation scheme, which sends two bits of digital information at a time, called…
Phase Shift Keying
Phase Shift Keying PSKPSK is the digital modulation technique in which the phase of the carrier signal is changed by varying the sine and cosine inputs at a particular time. PSK technique…
Frequency Shift Keying
Frequency Shift Keying FSKFSK is the digital modulation technique in which the frequency of the carrier signal varies according to the digital signal changes. FSK is a scheme of frequency modulation. The…
Amplitude Shift Keying
Amplitude Shift Keying ASKASK is a type of Amplitude Modulation which represents the binary data in the form of variations in the amplitude of a signal. Any modulated signal has a high…
What is parallel transmission?
When data is sent using parallel data transmission, multiple data bits are transmitted over multiple channels at the same time. This means that data can be sent much faster than using serial transmission…
What is serial transmission?
When data is sent or received using serial data transmission, the data bits are organized in a specific order, since they can only be sent one after another. The order of the data…
Quantization
The digitization of analog signals involves the rounding off of the values which are approximately equal to the analog values. The method of sampling chooses a few points on the…
