Cuyahoga County: Public Safety Answering Point ... - Cleveland.com

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Cuyahoga County: PSAP Assessment The diagram above represents a typical Phase II Wireless 911 call process flow, and listed below are the six key steps. 1. A 9-1-1 cell phone call is transmitted to the closest cellular tower. 2. The Tower equipment identifies this as an emergency call and transmits the voice signal, wireless phone’s callback number, and tower’s ID code to the Mobile Switching Center (MSC). 3. The MSC assigns a unique 10-digit routing number called an Emergency Services Routing Digit (ESRD) to the call. The ESRD is a 10-digit routable number that is used for routing on a per origination cell sector basis. Cellular services use three antennas on each tower, and each antenna face is assigned a unique ESRD. Also assigned is an Emergency Services Routing Key (ESRK). The ESRK is also 10-digit routable number that is used for routing. 4. The cellular carrier’s position-determining system uses GPS satellites to find the caller’s location. 4 http://fletch911.wordpress.com/article/cellular-e911-location-discovery-1558rwj796sda-10/ 4 Page 42
Cuyahoga County: PSAP Assessment 5. The MSC sends the call to the Local Exchange carrier who receives both the voice signal and the 10-digit ESRD and ESRK routing numbers. The call is now in the traditional E911 Tandem system used for wired calls, and the call is processed by a Selective router or 911 Tandem. The routing number is used to decide automatically which emergency call center is appropriate and passes the call on specialized E911 trunks, where the PSAP receives a 20-digit Automatic Number Identification (ANI) consisting of the ESRD and the ESRK. 6. The emergency call center operator receives the 9-1-1 voice call and a computer receives the unique 10-digit ESRK routing number. Using the ESRK routing number, the computer then connects to the location information database and retrieves the data that has been populated including the caller’s wireless number, the tower’s address, and the caller’s exact latitude/longitude coordinate location. At the same time, a computer mapping application (if available) can then use the latitude/longitude data and display this information on a map on the call taker’s PC. 9.3 Infrastructure Cuyahoga County can and should update its aged 9-1-1 infrastructure to include a distributed network with SONET ring technology. This new architecture and investment would assume four to five host sites for Regional Dispatching. There are huge benefits to investing in such a platform, not limited to the importance of load-balancing of the calls and the ability to failover call dispatching in the event of a disaster. The new 9-1-1 technology supports many groups sharing a single controller. On Windows Server Systems, a 9-1-1 controller is a server that responds to security authentication requests (logging in, checking permissions, etc.) within the Windows Server domain. A domain is where a user may be granted access to a number of computer resources with the use of a single username and password combination. 9.4 Technology Roadmap Cuyahoga County should create a prioritization plan to upgrade/update those PSAPs that will not be consolidating quickly (e.g., within the next two years to be 9-1-1 Phase Two Technological compliant). All 9-1-1 Controllers with the exception of Fairview Park are considered “end of life” and should be replaced to avoid any immediate issues in delayed response time related to dispatching. Page 43
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