Homework 5: Due March 4

• 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?

• what is the switching technique used in the PSTN?

• what is common channel signalling? Name three services that it enables on the PSTN?

• Answer the following questions after reading the Booz, Allen, Hamilton study on the telecommunications network for the State of Maryland.
  • How does the State of Maryland obtain voice services? Is it a private network?

  • What does the study suggest with respect to implementation of ISDN? What services is it expected to support. Be specific.

  • With respect to the decision to implement PBX vs. Centrex, what is the State currently doing? Do you agree with the implementation path the State is pursuing? Provide your rationale?

  • Is there a role for ACD-based call centers in the study?

  • What does the study propose with respect to implementation of the recommended concepts for voice services over a 2 year, 5 year and 10 year horizon?

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