# 1. You have 24 point-to-point connections that each requires a 64 kbps peak transmission rate. A 64 kbps circuit costs…

1. You have 24 point-to-point connections that each requires a 64 kbps peak transmission rate. A 64 kbps circuit costs \$400 per month. A 384 kbps fractional T1 circuit costs \$800 per month. A 1.544 Mbps T1 circuit costs \$1,700 per month. Because of bustiness, lines are in use only 10% of the time. Compare the monthly operating costs of transmission with individual connections (no multiplexing), with time division multiplexing (TDM), and with statistical TDM, respectively. A pair of 24-port TDM multiplexers lease for \$300 a month. A pair of 24-port STDM multiplexers lease for \$600 a month. Recommend a most economical solution. Hint:

Do not consider 3 x 3 = 9 scenarios. For each type of circuit, there is only one (1) sensible solution.

2. You have a modem that can operate at a symbol rate of 3,600. Design a modulation system to allow the modem to transmit at a data rate of 28,800 bps. Your design should vary both the amplitude and the phase of the carrier wave signal. A diagram of your design can be helpful, but it is not required.

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