Estimate Number of Telephone Lines
Use the following applet to estimate telephony traffic items using an Erlang
B algorithm. It can also be used to determine how many checkout points
are needed in a supermarket.
You can cut and past the data generated from the calculations.
Notes
Simply stated, the Erlang B algorithm calculates the percentage of calls
blocked whereas the Erlang C algorithm calculates the percentage of calls
that will be waiting to be answered and assumes there is a queue in which
the calls are held before being answered.
Another way of stating this is that the Erlang B algorithm calculates the
percentage number of callers who get a busy tone whilst the Erlang C algorithm
calculates the percentage number of callers who have to wait to be answered.
Posted on 23 March 2000 by Graham Lawrence