Question

We assume that ABC Corporation has two business offices. These offices are in the cities of...

We assume that ABC Corporation has two business offices. These offices are in the cities of Orlando and Atlanta. These cities are located about 450 miles apart. We assume that there are 2 employees in Orlando and 4 employees in Atlanta. 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

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

The cost of communications services and components

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