About Erlang Calculator
The Erlang B traffic model is used by telephone system designers to estimate the number of lines required for PSTN connections (CO trunks) or private wire connections. The three variables involved are Busy Hour Traffic...
The Erlang B traffic model is used by telephone system designers to estimate the number of lines required for PSTN connections (CO trunks) or private wire connections. The three variables involved are Busy Hour Traffic (BHT), Blocking and Lines:
Busy Hour Traffic (in Erlangs) is the number of hours of call traffic there are during the busiest hour of operation of a telephone system.
Blocking is the failure of calls due to an insufficient number of lines being available. E.g. 0.03 mean 3 calls blocked per 100 calls attempted.
Lines is the number of lines in a trunk group.
Previous Versions
Here you can find the changelog of Erlang Calculator since it was posted on our website on 2019-10-25 11:32:57.
The latest version is 8.0 and it was updated on 2026-06-27 16:20:49. See below the changes in each version.
Erlang Calculator version 8.0
Updated At: 2018-05-14
Changes: Added support for Android 8
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