Which incident would most likely occur if the end office feeding the 911 system is disconnected from the Tandem Switch?

Which incident would most likely occur if the end office feeding the 911 system is disconnected from the Tandem Switch?

• A. Isolation of an end office
• B. Loss of a DBMS
• C. Loss of a central office
• D. Loss of a PSAP

Answer: (A)

When a 911 call from an area is routed through an end office to the Tandem Switch, the Tandem Switch is the hub that connects that end office to the 911 network and to the database for the caller’s location. If the connection between that end office and the Tandem Switch is cut, that end office loses access to the 911 routing path. In other words, the end office becomes isolated from the 911 system, because there’s no path for its calls to reach the PSAP or to retrieve location data. The other options describe failures at different components that don’t specifically reflect the loss of the route from that particular end office to the 911 network.

When a 911 call from an area is routed through an end office to the Tandem Switch, the Tandem Switch is the hub that connects that end office to the 911 network and to the database for the caller’s location. If the connection between that end office and the Tandem Switch is cut, that end office loses access to the 911 routing path. In other words, the end office becomes isolated from the 911 system, because there’s no path for its calls to reach the PSAP or to retrieve location data. The other options describe failures at different components that don’t specifically reflect the loss of the route from that particular end office to the 911 network.