View of cell tower from behind barbed wire fence

Managing cellular access means really managing it, sometimes daily

The Mississippi State Penitentiary in Parchman was the first prison in the country to use the Intelligent Network Access Controller (iNAC), which blocks service for contraband cell phones inside the prison walls. Being on the cutting edge involved some learning, said Sean Smith, who heads the state’s Corrections Investigation Division.


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“Our biggest misconception was the idea that it was plug-and-play,” Smith said. “It is not. It’s called managed access for a reason.”

The reason is that the system can require daily management to keep it tuned to the precise footprint needed.

Precision is critical for iNAC. It is a local base station intended to be the preferred cellular service for all devices within a given area, so that usage can be controlled and unauthorized users, meaning the inmates, kept off the network. But the signal should not extend outside the gray walls, where it could pick up legitimate cell phones and deny them service because they are not on the prison’s approved list.

iNAC, from Tecore Networks, accomplishes this all-or-nothing feat with multiple directional antennas that can be positioned and their power adjusted to cover a required area. It can take several weeks to get a system configured to operate within the required parameter. But the RF environment is not static, and additional adjustments can be needed on a daily basis. Signal strength, direction and penetration can vary depending on physical changes in the environment, weather and outside signals from carriers’ cell sites.

Deployment of the system so far is in the early stages, with only two prisons using it, but Tecore is beginning a mainstream rollout of the product, showcasing it at the American Correctional Association’s annual conference in August. Smith had some advice for institutions considering the technology.

“Do as much research as you can, and understand what managed access does,” he said. "Understand your facility, what you need to do and what not to do."

About the Author

William Jackson is a Maryland-based freelance writer.

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Reader Comments

Tue, Sep 29, 2015

Regarding the positioning of these antennas. When an inmate calls another cell phone with a recording app installed. Dies the cell phone @ the cell phone pick up and transmitted audio waves (conversations among staff) to the cell phone with he recording app? Because during playback there is some pretty bizzara stuff.AKA XXX Where female voices are heard in the recording curricular activity. JUST ASKING.

Mon, Dec 2, 2013 Prisoner 99 In the Tower

Word in the prisons is the system is defeated B4 even going live, Voice over LTE is not blocked use an iPhone 5. Then for the high tech you could simply block the jamming services SID with a edited PRL which is used commonly on CDMA carriers. Blocking the SID would cause the phone to never see the jammer and work. Just a Managed Access SCAM on the tax payers, the system is a waste of money. The prison shouldn't have these phones inside if the administration did its job in the first place!

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