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911 Emergency Calling Systems Compatability


In this section, we review the prior Commission actions leading up to the present rules and proposals concerning 911 and E911 requirements for wireless and VoIP services.  The Commission has adopted rules requiring commercial wireless carriers to provide both basic 911 service, which connects the caller to a PSAP, and E911 service, which provides call-back and location information.  The E911 information requirements consist of two parts: Phase I – which requires wireless carriers to deliver to a PSAP the telephone number of the wireless 911 caller and the location of the cell site or base station that received the call, and Phase II – which requires wireless carriers to provide the location (latitude and longitude) of the caller within particular accuracy parameters, depending on the location technology that the carriers have chosen. In its initial E911 Report and Order, released on July 26, 1996, the Commission adopted Section 20.18(h), which specifies the accuracy requirements for the provision of E911 by wireless carriers. As amended by today’s Second Report and Order, Section 20.18(h) requires licensees subject to the wireless E911 requirements, to ultimately comply with the following Phase II location accuracy and reliability standards at the county or PSAP service area level, based on certain benchmarks, limitations, and exclusions:  for network-based technologies: 100 meters for 67 percent of calls, 300 meters for 90 percent of calls; for handset-based technologies: 50 meters for 67 percent of calls, 150 meters for 90 percent of calls.


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