# Call volume (telecommunications) Redirected from **Calls per second**

In telecommunications, **call volume** refers to the number of telephone calls made during a certain time period. Depending on context, the phrase may refer to either the number of calls made to a specific physical area or telephone number (such as an emergency service) or the number of calls made between two or more areas (e.g. cities).

**Calls Per Second** or **CPS** refers to how many telephone calls can be handled in a second.
CPS is one measure of the performance of Switching systems. It helps in estimating Busy-hour call attempts (BHCA) and Busy-hour call completion (BHCC) of Switching systems.

Various formulas exist to forecast the number of calls that might be made; another key distinction concerns whether long or short-term trends are to be predicted.^{[1]}

## Forecast Formulas

Perhaps the simplest formula used to forecast call volume is the linear equation

where *y* is the expected call volume, *x* is time, and *m* and *b* are constants.

However, this is suitable for long-term trends only,^{[1]} and further assumes that growth will be linear. Another formula, seen in a mathematics textbook,^{[2]} is the inverse square equation

where *C* is the number of expected calls between two cities (during one day), *P*_{1} is the population of the first city (in thousands), *P*_{2} is the population of the other city (also in thousands), and *d* is the distance between them (units unclear in the book, but probably miles).

## See also

## References

- ^
^{a}^{b}See How to Do Call Volume Forecasting for Service Desks Archived 2007-11-04 at the Wayback Machine **^**Blitzer, Robert (2006).*Introductory and Intermediate Algebra for college students -- 2nd ed*. Pearson Prentice Hall. p. 507. ISBN 0-13-149259-4.

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