2B) A channel has a data rate of 6 kbps and a propagation time of 40 ms. Identify range of frame sizes does stop-and-wait give a line efficiency of at least 50%? 2C) The bipolar-AMI waveform representing the binary sequence 0100101011 is transmitted over a noisy channel. The received waveform is shown in Figure Q2C it contains a single error. Locate the position of this error and justify. 1 2 3 4 5 6 7 8 9 10 Figure Q2C.
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Texts: 1. In a stop-and-wait ARQ system, the bandwidth of the line is 10 Mbps. A bit takes 3 ms to travel from source to destination. The length of the data frame is 5000 bits. Three channels, each sending 128 bytes/second, are multiplexed using TDM. Multiplexing is done 1 byte per channel. a) What will be the size of the frame? b) What will be the frame rate and the bit rate of the output channel?
Adi S.
(a) A teleprinter system operating at 200 baud, represents each alphanumeric character by a 5 bit codeword and each binary state by ± 10 V. If the line attenuation over a regenerator section is 46 dB and the rms noise voltage at the regenerator input is 17.2 mV, calculate the average character error rate per minute. Assume equal probability of each binary state and an optimum reference level for the decision comparator, stating its value in volts. Comment generally on the effect of each of the following on the error rate: (i) non-equal probability of state occurrence, (ii) inclusion of a parity bit in each codeword, (iii) use of two threshold levels with double the voltage swing at the teleprinter output, (iv) cascading n such regenerator sections. (b) Justify the following relationship for a single-error-correcting Hamming code, having R check bits and M data bits, with a Hamming distance of 3: M + R ≤ 2^R - 1 Outline a possible code table for such a Hamming code using 3 data bits and illustrate its error correction action by assuming an error in one of the received data bits.
Lien L.
Consider a data sequence 1 0 0 0 0 0 0 0 0 1 0 1 that is transmitted at a rate of 5 kb/s. The sequence is to be transmitted using NRZ-L, B8ZS, Manchester, AMI, polar RZ, NRZ-I, and differential Manchester techniques. a- Draw the waveform for each scheme. b- Which scheme is being used in LAN? c- Determine the bandwidth for each scheme. d- Which schemes cannot use AC coupling? e- Which schemes have self-synchronization capability?
Akash M.
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