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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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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– Detects cell phones whether they are on or off and
does not depend on frequency band
Sniffer
Emits Signal
Detects Response
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
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
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