The MP-1A device is designed to protect a telephone set in call waiting mode from leakage of room signals in the audio frequency range through an analog telephone line. Information leakage from signal sources due to acoustoelectric transformations, as well as information retrieval using active methods of influence, is excluded. The device provides two levels of protection: passive and active. The MP-1A device is structurally designed as a printed circuit board with elements filled with compound and can be placed in a plastic housing of a telephone socket. The device contains a noise generator, nonlinear circuits and a low-level signal suppression unit, with the help of which a noise signal is introduced into the subscriber line, a low-level signal is attenuated from the telephone set towards the subscriber line and information is protected from leakage during active methods of influence in call waiting mode.
Distinctive features: Providing two levels of protection - active and passive.
The product is certified by the FSTEC of Russia and can be installed in designated premises up to and including category 1.
Technical specifications: Purpose protection of analog telephone sets Protection against microphone effect Yes Noise signal frequency band 0.02 - 30 kHz Insertion attenuation not less than 68 dB Noise signal voltage in the line not less than 12 mV Consumption current not more than 0.42 A Mean time between failures not less than 100,000 h Dimensions without housing not more than 32 x 15 x 13 mm