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Effect of Timing Error The timing requirements for this scheme are modest(适中的)For example, IRA (International Reference Alphabet )character are typically sent as 8-bit units, including the parity bit. If the receiver 5 percent slower or faster than the transmitter, the sampling of the eight character bit will be displaced(EJ)45 percent and still b correctly sampled. Figure 6. 1(c)shows the effects of a timing error of sufficient magnitude to cause an error in reception. In this example we assume a data rate of 10, 000 bits per second(10kbps); therefore each bit is0.1 ms. or 100us. duration. assume that the receiver is fast by 6 percent, or 6us per bit time. Thus, the receiver samples the incoming character every 94us. As can be seen, the last sample is erroneous 网络通信网络通信 6 Effect of Timing Error • The timing requirements for this scheme are modest(适中的). For example, IRA (International Reference Alphabet) character are typically sent as 8-bit units, including the parity bit. If the receiver is 5 percent slower or faster than the transmitter, the sampling of the eight character bit will be displaced(移动)45 percent and still be correctly sampled. Figure 6.1(c)shows the effects of a timing error of sufficient magnitude to cause an error in reception. In this example we assume a data rate of 10,000 bits per second (10kbps); therefore, each bit is 0.1 ms, or 100us, duration. Assume that the receiver is fast by 6 percent, or 6us per bit time. Thus, the receiver samples the incoming character every 94us. As can be seen, the last sample is erroneous
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