All products from this site support the following models.

Model Applications
Erlang B Designing public phone systems where:   
  • blockage is very low and hence retries are uncommon (and can be neglected), or
  • blockage may be high, but blocked calls overflow to some other facility (modeled separately)
  • Grade of Service, non-USA Telcos
  • Grade of service in commercial (low blockage) networks
Poisson
  • Grade of Service, USA Telcos
  • Grade of service in commercial networks
  • PBX trunk sizing in large offices
Erlang C
  • Calculating staffing levels (i.e.. required agents) for customer call centers
  • Auto-Attendants, Auto Call Distributors (ACDs)
  • Latency in data transmission circuits
  • Bank Teller, Supermarket, etc. lines
Engset Designing private phone systems (PBXs) where:
  • blockage is very low and hence retries are uncommon (and can be neglected), or
  • blockage may be high, but blocked calls overflow to some other facility (e.g. public phone system)
Binomial Designing private phone systems (PBXs) where:
  • Office size (sources) is small
  • Where there is no overflow
  • Networked servers (e.g. Fax Servers, Modem Pools,)
  • Help Desk phone traffic.
Delay
  • Networked servers (e.g. Fax Servers, Modem Pools,)
  • Repair turnaround.
Call Center This is built on top of the Erlang C model. It is specifically designed for modeling telephone call centers, and allows you to calculate:
  • Required numbers of agents to 'answer xx% of calls within yy seconds'
  • Required number of incoming phone lines (trunks)
  • Average delay, agents busy, etc.

 

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Last modified: March 25, 2015