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Part II
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data over the phone lines by means of a modem Serial communications and the RS-232 standard are discussed in the next section The RS-232 Standard The primary reason why parallel transmission of data is not used exclusively is the limited distance range over which it is possible to transmit data on a parallel bus Although there are techniques which permit extending the range for parallel transmission, these are complex and costly Therefore, serial transmission is frequently used, whenever data is to be transmitted over a signi cant distance Since serial data travels along one single path and is transmitted one bit at a time, the cabling costs for long distances are relatively low; further, the transmitting and receiving units are also limited to processing just one signal, and are also much simpler and less expensive Two modes of operation exist for serial transmission: simplex, which corresponds to transmission in one direction only; and duplex, which permits transmission in either direction Simplex transmission requires only one receiver and one transmitter, at each end of the link; on the other hand, duplex transmission can occur in one of two manners: half-duplex and full-duplex In the former, although transmission can take place in both directions, it cannot occur simultaneously in both directions; in the latter case, both ends can simultaneously transmit and receive Full-duplex transmission is usually implemented by means of four wires The data rate of a serial transmission line is measured in bits per second, since the data is transmitted one bit at a time The unit of 1 bit/s is called a baud; thus, reference is often made to the baud rate of a serial transmission The baud rate can be translated into a parallel transmission rate in words per second if the structure of the word is known; for example, if a word consists of 10 bits (start and stop bits plus an 8-bit data word) and the transmission takes place at 1,200 baud, 120 words are being transmitted every second Typical data rates for serial transmission are standardized; the most common rates (familiar to the users of personal computer modem connections) are 300, 600, 1,200, and 2,400 baud Baud rates can be as low as 50 baud or as high as 19,200 baud Like parallel transmission, serial transmission can also occur either synchronously or asynchronously In the serial case, it is also true that asynchronous transmission is less costly but not as fast A handshake protocol is also required for asynchronous serial transmission, as explained in the following The most popular data-coding scheme for serial transmission is, once again, the ASCII code, consisting of a 7-bit word plus a parity bit, for a total of 8 bits per character The role of the parity bit is to permit error detection in the event of erroneous reception (or transmission) of a bit To see this, let us discuss the sequence of handshake events for asynchronous serial transmission and the use of parity bits to correct for errors In serial asynchronous systems, handshaking is performed by using start and stop bits at the beginning and end of each character that is transmitted The beginning of the transmission of a serial asynchronous word is announced by the start bit, which is always a 0 state bit For the next ve to eight successive bit times (depending on the code and the number of bits that specify the word length in that code), the line is switched to the 1 and 0 states required to represent the character being sent Following the last bit of the data and the parity bit (which will be explained next), there is one bit or more in the 1 state, indicating idle The time period associated with this transmission is called the stop bit interval
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