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1. Consider a 40-meter communication link operating at 2 Mbps. The velocity of propagation in optical fibers is about 2 x 108 m/s. A frame of 4000 bits is sent from a source node to a destination node (assume the nodes are connected with a direct link). If we send frames continuously over 48 hours, the probability of receiving 1 bit in error is: a. 6.94 x 10-7 b. 1.157 x 10-8 C. 2.89 x 10-12 d. None of the above 2. A communication system uses delta modulation with a sampling rate of 5 samples/sec. The bit duration in this system is: a. 0.2 seconds b. 0.4 seconds C. 5 seconds d. None of the above 3. The following system uses TDM to multiplex four 106 bytes/s channels. Assume that 4 bytes are multiplexed at a time. The output bit rate will be 106 bytes/s 106 bytes/s MUX 106 bytes/s 106 bytes/s a. 106 bps b. 2 x 106 bps C. 8 x 106 bps d. 32 x 106 bps 4. Continuing with Question (3), the output frame rate will be: a. 106 frames/s b. 250 x 103 frames/s C. 4 x 106 frames/s d. None of the above 5. Consider a communication system in which several source landline telephones are to share a cable that connects them to several destination landline telephones. The sharing of the cable is best achieved by: a. Using TDM only b. Using FDM only C. Either using TDM or FDM d. Using FM modulation