What is the use of MODEM at the transmitting end?
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@writeacher.... duh ~……… Dats not an answer...
Of course not. The point is that you learn to find your own answers!
@writeacher.... Well... ur ryt too...Thnx :-)
A MODEM (Modulator-Demodulator) is a device used for transmitting digital data over analog communication channels. It performs the important function of converting digital signals from a computer or a network device into analog signals that can be transmitted over a telephone line, cable connection, or any other analog medium.
At the transmitting end, the MODEM plays the following roles:
1. Modulation: The MODEM converts digital data into analog signals that can be transmitted over the communication channel. It achieves this by using modulation techniques, where it combines the digital signal patterns with a carrier signal, altering certain aspects of the carrier wave such as amplitude, frequency, or phase. This process converts the digital data into a format suitable for transmission over analog channels. The specific modulation method used depends on the type of MODEM and the communication standard being used.
2. Encoding: In addition to modulation, the MODEM performs encoding of the digital data. This encoding process prepares the digital signal for modulation and ensures error-free transmission. Various encoding techniques, such as error correction and data compression, are used to maximize the efficiency and reliability of the data transmission.
3. Channel Access: The MODEM manages the access to the communication channel. It establishes a connection with the receiving end, verifies the availability of the channel, and ensures that the communication can take place without interference or conflicts with other devices. This involves protocols such as carrier sensing, handshake signals, and channel negotiation.
4. Signal Conditioning: The MODEM also performs signal conditioning to optimize the analog signal for transmission. The signal is amplified, equalized, and filtered to compensate for noise, distortion, and interference that can occur during transmission, thereby improving the overall signal quality.
By combining these functions, the MODEM enables reliable and efficient transmission of digital data over analog communication channels, facilitating communication between computers or network devices over long distances.