| Electrically, all K-COM Filters operate in the common-mode. While not
dismissing other modes of interference and other possible measures for interference
rejection, K-COM finds the majority of Telephone Interference cases to be those in which
RF currents flow in the common mode (on both sides of a telephone pair and/or on all
conductors in telephone wiring). These findings concur with numerous organizations and
entities who have studied the cause and effect of RFI on telephone devices. K-COM
Filters are transparent in the differential mode. Because they introduce negligible
impedance at the frequencies of telephone signals, K-COM filters have no effect on proper
operation of telephone equipment. This is a critical benefit in "hot" RF
environments where practical reduction of massive RF current flow (and thus reduction of
the interference) can be achieved only with numerous filters in the telephone wiring.
Test bed criteria for the following laboratory findings specified measurement in the
common mode. Analysis showed remarkable consistency from filter-to-filter.
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