A) Transmission speed
B) Data Accuracy
C) Error detection and correction
D) Data compression
E) None of these
Correct Answer: B
Solution :
A modem is a device us to allow a computer communicate over a telephone line. A modem is characterized by ? ? Transmission speed: the sprat which data can be transmitted over a telephone line "This has increased steadily Modern moderns can opens at speeds up to 56.6 kbps. ? Compression: Date can be transferred between two computers more quickly if it is compressed before it is transmitted. Modem compress data connected to sending computer and decompress data connected to receiving, computer. ? Error correction & Detection When data is sent over a telephone line it often encounter noice. Noise is electrical interference which corrupts the data that is received. The modem receiving data, detects 'whether or not the data has been corrupted. If it has been corrupted the modem will attempt to correct it validation checks such as parity checks CRC can be used to detect & correct errors
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