Device for protecting telephone sets of digital PBX from unauthorized access MP-7 "Gvard"

The MP-7 "Guard" protection device is designed to protect a digital telephone set (DTS) in call waiting mode from leakage of room signals in the audio frequency range (acoustoelectric conversions) through the telephone and microphone capsules of the handset, the speaker and microphone of the loudspeaker, as well as disabling the room listening mode.

To prevent information leakage due to non-standard acoustoelectric converters of the DTS, the MP-1Ts protection device must be additionally used, which in such cases eliminates information leakage, and also provides protection against active methods of influence in call waiting mode.

The MP-7 device is structurally implemented as a printed circuit board installed inside the TA.

The device contains: switching units for acoustoelectric converters of the telephone; a unit for protection against leakage through the speaker of the GGS; a unit for monitoring the state of activity of the TA.
The device is connected to the TA using a cable.

The product is certified by FSTEC of Russia and can be installed in dedicated rooms up to category 2 inclusive.

Technical specifications:
Insertion loss from acoustoelectric transducers of the TA towards the circuit elements in the frequency band of 0.01 - 20 kHz for acoustic signals of the room is not less than 80 dB
Insertion loss for signals coming to the loudspeaker of the loudspeaker is not more than 1 dB
Current consumption of the device from the TA is not more than 10 mA
Overall dimensions of the device without a loop are not more than 50x40x3 mm
Weight of the product is not more than 30 g