Homework 5: Due October 12
 What is multiplexing? What is the economic rationale for its use?
 What is frequency division multiplexing?
 How does statistical TDM differ from synchronous TDM?

Three terminals A, B, and C are to be connected to three computers D, E and F so that A is connected D, B to E and C to F. All are in different cities. A and D are 1500 miles apart as are B and E and C and F. The locations of the terminals are 25 miles apart (i.e., A is 25 miles from B and C and B is 25 miles from C). The same is true for the locations of the computers D, E and F.
 If telephone lines cost $1 per mile, what is the line cost for three independent lines?
 If a multiplexer/demultiplexer pair costs $2000, can you save money by another arrangement of lines? If so, how much?
 Investigate the pricing structure of a T1 line from Pittsburgh to Philadelphia? How does it compare to a 56Kbps DDS line? Document your source.
 What is the cost of a 24 port multiplexer that can support 24 56/64Kbps channels on the user side? What is the cost of CSU/DSU that can be used with 56Kbps service? Document your source.
 Given your investigation of costs of T1 and 56Kbps service, under what conditions would you recommend multiplexing?
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Ramayya
Krishnan rk2x@andrew.cmu.edu