We assume that ABC Corporation has two business offices. These offices are in the cities of Orlando and Miami. These cities are located 220 miles apart. We assume that there are 3 employees in Orlando and 6 employees in Miami. Further, we assume that each employee calls the other site 4 times a day and talks for an average of 5 minutes. Further, each employee calls others in the same office 10 times a day for an average of 3 minutes. We will assume that 20% of the calls happen in the peak hours of the day. A blocking rate of 5% is acceptable for calls between the 2 sites.

a. What is the cost of PSTN (straightforward) solution? b. Perform the Erlang calculation c. Calculate the Blocking d. Number of links required between these sites with respect to 5% blocking rate. e. Number of Leased lines and PSTN lines f. Total cost of your design

The cost of communications services and components

Item	Cost
Line to PSTN	$25/Month
Local Call	$0.05/Minute
Long Distance Call	$0.40/Minute
PBX	$2000 Purchase Price
Leased Line	$275/Month