We assume that EFG 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 the 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