Given a movie of 45 frames, each frame containing 480 * 430 pixels with 256 color depth:

How many bits are there in the full-motion image?

480*430*45*8

74,304,000 bits

Suppose that the movie is to be sent over a line at 4Mbps. How long will it take, ignoring any overhead?

74,304,000 bits / 4,000,000 bits/sec

18.576 seconds

Assume the movie is transmitted over a line with a bandwidth of 3400Hz and we use a modulation technique that sends 4 bits per symbol.  How long will it take?

3400 cycles * 4 bits = 13,600 bits/sec

5,463.5 seconds

What is the lowest transmission rate that can send the movie in 3 seconds?

74,304,000 bits / 3 seconds

24,768,000 bits/sec 

Draw how the ASCII character sequence "rJ" would be encoded to digital signal using the following encoding schemes.

ASCII
r = 01110010 J=01001010

NRZI
0111001001001010

Manchester
10 01 01 01 10 10 01 10 10 01 10 10 01 10 01 10

Differential manchester (start high)  Alternate 01 or 10 when you encounter a "1"
10 10 10 10 01 10 10 01 | 10 10 01 10 10 01 01 10

Calc. nuber of bits used to send a 3-minute telephone call using telco-standard PCM.

8 bits / sample * 8000 samples /sec * 180 seconds = 368,640,000 bits

When a document is transmitted from a ground station to another ground station through the satellite, determine the propogation delay.

The distance between a ground station and satellite is 35,780 km

35,780,000 meters / 300,000,000 meters/sec == 0.1193 sec * 2 = 0.2385 sec
(3.0 * 10^ 8 is propagation rate of EM radiation through a vacuum)