Technology Behind a 911 Call

TECHNOLOGY BEHIND A 911call Enhanced 911 A system used in North America that links emergency callers with the appropriate public resources 91| WAS CHOSEN AS THE EASY ACCESS CODE > The system tries to automatically associate a location with the origin of the call > Typically answered at the Public Safety Answering Point (PSAP) > The PSAP is a governmental agency that has jurisdiction over the caller's location Wireline Wireless enhanced 911 enhanced 911 The (FCC) has several requirements applicable to wireless telephones 1) Phase 1: Wireless operators identify the callers phone number within 6 minutes by PSAP 2 Phase 2: Wireless operators provide the callers location ALI Failure ANI • When a 911 call is placed, this phone is identified through the Automatic Number Identification (ANI) and passed to the PSAP • Occurs if the phone number is not in the ALI database • The call is then passed to the trunk group's default Emergency Service Number (ESN) 2 • The PSAP operator must then ask the incoming caller for their location and redirect them to the correct PSAP • The Automatic Location Identification (ALI) maintains the database of: - Subscriber's Name - Physical address for a wired phone account - Billing information Location is an important concept in the way the enhanced 911 system works 3 Selective Router Automatic Location Information (ALI) Location determination depends on the Automatic Location Information (ALI) database • A Master Street Address Guide (MSAG) matches the caller's location • Used to determine the caller's location Public Safety Answering Point (PSAP) Third Party Third Party Emergency Medical Devices Home Security Systems In charge of transferring calls to other public or safety agencies to dispatch emergency A state-managed local call center where 911 calls are routed services The final destination of an E911 call (where the 911 operator sits) is a PSAP Operated 24 hours a day There are 6,100 PSAPS in the U.S. Assigned the responsibility of receiving 911 cals Personnel at the PSAP determine what action to take to best manage an emergency situation Capable of directly dispatching emergency services Emergency Response Services Emergency Medical Services Police Services Fire Services PSAP statistics Washington DC receives 240 million calls to 911 each year, with 1/3 of them wireless Los Angeles receives 5 million calls per year 80% of 911 calls 1.8 million calls per year 99% of the population is covered by basic 911 on non-emergencies SOURCES: http://en.wikipedia.org/wiki/Enhanced_9-1-1#Location http://www.maine911.com/psap/index.htm http://testdrive.mapinfo.com/techsupp/miprod.nsf/kbase_by_product/2312A3A6B51764F485256B4400572CE4 http://www.ct.gov/despp/cwp/view.asp?a=4153&Q=494106&desppNav_GID=2066 http://www.911dispatch.com/info/fact_figures.html ALI Database/ MSAG EXCHANGE Location Database