.. _sphx_glr_api_gallery_probability_queueing:

Queueing theory
----------------

Erlang's loss formula for telephone traffic.


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    <div class="sphx-glr-thumbcontainer" tooltip="For Poisson call arrivals offering A erlangs of traffic to c lines, a call is lost with probability B(c, A). Erlang&#x27;s formula answers the engineer&#x27;s question: how many lines keep losses below 1%?">

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  .. image:: /api/gallery/probability/queueing/images/thumb/sphx_glr_plot_01_erlang_b_thumb.png
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  :doc:`/api/gallery/probability/queueing/plot_01_erlang_b`

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      <div class="sphx-glr-thumbnail-title">Erlang's loss formula: how many telephone lines?</div>
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    </div>


.. toctree::
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   /api/gallery/probability/queueing/plot_01_erlang_b