Filters for TEMPEST, often referred to as Transient ElectroMagnetic Pulse Emanation Standard, prevent eavesdropping on data radiated as signals from computers and peripherals via conducting lines (such as power, telephone or control line cables). These signals may be intercepted by an enemy's intelligence services, or a business rival. MPE manufactures Extended Performance and Very High Current ranges of power line filters which support the highest level of TEMPEST hardening. According to the company, they provide exceptional insertion loss performance across a wide frequency spectrum, in standard or custom formats. The mains supply filters meet the industry standard for TEMPEST EMI filter performance (insertion loss) of 100dB in a frequency range from 10kHz to 10GHz. Secondary level of TEMPEST protection is 60dB from 100kHz to 1GHz on individual pieces of equipment. This may call for additional power, data, telephone and control line filters to cover all systems under threat. Housed in electroplated steel cases, the filters are compact for flexible, bulkhead or chassis mounting into rack systems and standalone computer equipment, especially where low earth leakage is critical. The filters are available in ratings from six to 2400A in both single- and three-phase versions and meet international TEMPEST standards for emanation security.
