The cell phone within the electric fence cannot communicates with the outside

Prison Cell Phone Jammer System Solution

1 Prison cell phone jammer shielding need analysis and solution

The cell phone jammer system has passed the strict testing of Testing Center for Quality of Security & Police Electronic Product under the Ministry of Public Security of P.R. China and Safety product Testing Certification Center of PLA.

The indices and technologies of cell phone jammer system are of the world advanced level. The cell phone jammer runs stably in the practical use in central government agency secrecy units, state agency secrecy units, air force, navy, general staff, Nanjing war zone, Guangzhou war zone, People’s Liberation Army garrison in Hong Kong and Macao and so on.

The cell phone jammer has gain the support from the China Mobile, China Unicom and radio management committee and so on in Changchun, Shenyang, Jinzhou, Jinan and so on. According to actual requirement of the customer, the real signal field strength for the four prison areas have been measured through using the specific cell phone signal testing tool.

The solution is as follows taking into account that the prison area and cell phone signal base station are close and every prison area is the building floor structure.

1.1 Outdoor installation of cell phone jammer system

The overall architectural structure features are as follows: there are four areas with three cell phone signal base stations spaced from east to west and a road spaced from south to north; the environment is complicated and the area of every prison zone is big. Therefore, HTCX-100B (direction) cell phone jammer is recommended to be installed around every prison zone.

Note: HTCX-100 is middle-type omnidirectional cell phone jammer. HTCX-100A is the small-type directional cell phone jammer. HTCX-100B is large-type directional cell phone jammer. CONSDATA-1000A is warfield-type directional cell phone jammer.

For the site situation (such as the architectural layout and floor situation and so on) is not that clear, especially the signal strength is not measured, two kinds of allocation plans are recommended. Plan 1 (economic): 15 sets of large-type directional cell phone jammers are adopted. If the base station signal is too strong to be suppressed, 1 or 3 large-type directional cell phone jammer(s) should be added.

Plan 2: 5 large-type directional cell phone jammers and 2 outdoor warfield-type directional cell phone jammers should be adopted. The plan has no special requirements about the architectural layout, floor situation and base station signal strength.

1.2 Outdoor installation schematic diagram of cell phone jammer system

Plan 1: 15 large-type directional cell phone jammer allocation layout. Note: ★ means the specific installation position of cell phone jammer.

Plan 2: 5 large-type directional cell phone jammer and 2 outdoor warfield-type directional cell phone jammer.

2 Design principle of prison cell phone jammer system

The communication characteristic of mobile phone: the GSM or CDMA cell phone has a forward channel to send the message and a backward channel to receive the message. During communication, the cell phone turns the voice or data information into the data frames with the length of several milliseconds and continuously transmits the information in the form of data chain through the digital cellular net.

The cell phone jammer designs the shielding signal starting device controlled by the computer for these characteristics. The device can generate a spherical electric fence to act on various cell phone forward channels to completely shut off the cell phone data chain so that the cell phone within the electric fence cannot communicates with the outside with the specific behavior of searching net, no signal and no service and so on.

3. Beijing Consdata Company Introduction

Beijing Consdata Company, locating in Beijing High and New Technology Development Area, is a high-tech enterprise. The company has a group of high-tech talents and first-class research and development equipments with developing and manufacturing the safety cell phone jammer product as the main target of the company.

Our company finally finds a technical track to effectively prevent cell phone leaking and successfully manufactures the cell phone jammer of independent intellectual property through using the electromagnetic emission suppression technology after deeply analyzing the cell phone communication principle.