TIA 504 : A1998
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TELECOMMUNICATIONS - TELEPHONE TERMINAL EQUIPMENT - MAGNETIC FIELD AND ACOUSTIC GAIN REQUIREMENTS FOR HANDSET TELEPHONES INTENDED FOR USE BY THE HARD OF HEARING
12-01-2013
Defines magnetic field requirements for all handset telephones intended to couple magnetically with hearing aids. This standard also covers requirements for receive-amplified handset telephones intended for use by the hard of hearing. Not applicable to cover other devices for the hard of hearing to use the telephone network.
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