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Oakland Identifies Interference to P25 System from AT&T 2G Service (8/27/12)
AT&T Wireless’ network was interfering with the city of Oakland, Calif., Project 25 (P25) public-safety radio system, and the carrier has shut down 850 MHz antennas at 16 sites to alleviate the problem, according to city officials.
The city began investigating interference problems that occurred with the P25 radio system during a presidential visit last month. The FCC began an enforcement investigation into the issue as well.
After reviewing communications logs and discovering a pattern to reports of interference, the city’s team shared its findings with the FCC. The city and AT&T Wireless’ engineering teams jointly conducted testing and validation of the RF conditions at an AT&T tower location on East Ninth St. Both teams concluded that the AT&T 850 MHz GSM cell site was causing significant interference to the city of Oakland’s P25 system.
City officials said it had data proving many of the carrier’s cell sites were exhibiting the same program. AT&T shut down 2G 850 MHz GSM antennas at 16 cell sites to resolve the problem. The carrier still has active 2G 1.9 GHz, 3G and 4G service at the sites.
“The P25 team will review AT&T cell sites in neighboring cities whose signals transmit into Oakland, as well as cell sites used by other wireless service providers,” a city statement said.
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