Prison mobile phone shielding system must have the use requirements

1. Act on all current domestic public communication standard mobile phones CDMA, GSM, DCS, PHS, 3G (CDMA2000/TD-SCDMA/WCDMA), and shall not affect the normal operation of other electronic equipment systems in the prison;

2. Within the prison area (including but not limited to prison room, walkway, corridor, window, etc.), the effective shielding rate should reach 99.9% or more;

3. In the production area, the effective shielding rate should reach 99% or more;

4. In confined narrow spaces (including but not limited to conversation rooms, storage rooms, toilets, etc.) and more hidden places with greater possibility of violations, the effective shielding rate should reach 99.9% or more;

5. In non-shielded areas (including but not limited to administrative buildings, armed police buildings and surrounding units or residential areas, etc.), smooth communication must be ensured;

6. After the signal jammer achieves the shielding effect, it must pass the electromagnetic radiation safety test on the shielding site;

7. Fully retain the output redundancy of the equipment, increase the service life and adapt to future development requirements;

8. The system must use centralized power supply.

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