The MP-1C device is designed to protect a telephone set in call waiting mode from leakage of room signals in the audio frequency range through a digital 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-1C 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, which provide for the introduction of a noise signal into the subscriber line, attenuation of a low-level signal from the telephone set towards the subscriber line and protection of information from leakage during active methods of influence in call waiting mode.
Distinctive features: Provision of two levels of protection: active and passive.
The product is certified by FSTEC of Russia and can be installed in dedicated premises up to and including category 1.
Technical specifications: Purpose protection of digital telephone sets Protection from microphone effect Yes Noise signal frequency band 0.02 - 300 kHz Insertion attenuation not less than 43 dB Noise signal voltage in the line not less than 32 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