What is PIM?

The Cost of PIM

In our experience, a simple rule of thumb is that for each dB of Passive Intermodulation, throughput is reduced by approximately 8%. Hence a 6 dB PIM interferer can reduce throughput by half. In extreme cases, new sites cannot be put into service until the interference is resolved.

The reduction in throughput directly impacts revenue. Indirectly, slower speeds impact competitiveness and drives up subscriber churn. If you are interested in an impact analysis for your network, contact us for more information.

Calculating PIM

The incidence of PIM is growing as new bands increase the amount of spectrum in use and wireless networks continue to add more small cells and cell sites.  It typically takes time, experienced technicians, and sophisticated equipment to identify and locate the sources of PIM.

PIM occurs when frequencies mix, caused by a variety of factors.  The likelihood of PIM being present can be predicted by formulas that use the frequency bands of interest in the equation.  The same calculation can be used to confirm the degradation comes from PIM and not some other type of interference and can help identify potential sources.  A PIM calculator is a tool programmed to perform those calculations. It allows network operators to resolve the impaired network condition more quickly, saving time and money.

Use ISCO's PIM Calculator to determine whether your frequency bands or others in use in the area have the potential to create PIM in your bands of interest.