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Countering Contraband Cell Phone Use in Prisons

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Countering Contraband Cell Phone Use in Prisons. A Technical Explanation of Available Technologies. Electronic Sniffers. Sniffer emits low power radio signal and detects reflections from nearby electronics Must be close to the cell phone to detect it - PowerPoint PPT Presentation

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Page 1: Countering Contraband Cell Phone Use in Prisons

Countering Contraband Cell Phone Use in Prisons

A Technical Explanation of Available Technologies

Page 2: Countering Contraband Cell Phone Use in Prisons

Electronic Sniffers• Sniffer emits low power radio signal and

detects reflections from nearby electronics– Must be close to the cell phone to detect it– Detects cell phones whether they are on or off and

does not depend on frequency band

Sniffer

Emits Signal

Detects Response

Page 3: Countering Contraband Cell Phone Use in Prisons

Passive Detection• Listens for cell phone signals

– Only detects a cell phone when it is active– Calls can be connected– Network of sensors triangulate cell phones – Hand-held detectors are also available

Detector

Detector Detector

System Provides Location Of DevicesPrison Building Footprint

Page 4: Countering Contraband Cell Phone Use in Prisons

Jamming• Jamming is the deliberate radiation for the purpose of disrupting use

of electronic devices, equipment, or systems• Cell Phone Jammers:

– Are frequency band specific, transmit on same radio frequencies as the cell phone to overpower desired signals and disrupt link between phone & tower

– Do not discriminate among cell phones within range of the jamming signal – both contraband and legitimate cell phones are disabled

Jammer

Jammer Jammer

Radio Signal

Generator

Prison Building Footprint

Can be a Network ofIndividual Jammers or

Use “Leaky” Cable

All Calls Blocked

Page 5: Countering Contraband Cell Phone Use in Prisons

Inmate Call Capture Technologies• Effectively a mini-cell site• Impermissible calls are not connected (blocked)• Permissible calls are released and connected as usual• Policies selectable by system administrator• All 911 calls can be connected

Prison Building Footprint

Permitted Calls Connected to Cell Network As Usual

Prison ManagedAccess Cell Site

Blocks impermissibleCalls

Captured & Released