Telecommunications Technology and 9-1-1 Systems Flashcards
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What is the significance of 'Phase I' wireless 9-1-1 capability?
Answer: It delivers the callback number and the location of the cell tower serving the call
Wireless Phase I provides the caller's callback number and the location of the cell sector or tower routing the call, not the device's exact location.
A dispatcher receives a 9-1-1 call where the caller is silent. Which technology helps identify the caller's location when no verbal information is provided?
Answer: ALI database lookup via ANI
When a caller cannot speak, the dispatcher can use ALI data retrieved via the caller's ANI to identify and dispatch to the registered location.
What does 'redundancy' mean in the context of PSAP infrastructure?
Answer: Duplicating critical systems so operations continue if one component fails
Redundancy means critical PSAP components such as power, servers, and network connections are duplicated to prevent single points of failure.
Which of the following best describes a 'secondary PSAP'?
Answer: A PSAP that receives transferred calls from a primary PSAP for dispatch of specific services
A secondary PSAP receives 9-1-1 calls transferred from a primary PSAP and is responsible for dispatching specific services such as fire or EMS.
What is the purpose of 'call detail records' (CDRs) in a PSAP?
Answer: They document metadata about each call including time, duration, and trunk used
CDRs capture technical data about each call — such as timestamps, trunk ID, and call duration — used for billing, audits, and performance analysis.
A PSAP is testing its backup power system. Which sequence correctly describes the power backup hierarchy during an outage?
Answer: UPS bridges the gap until the generator starts, then generator sustains operations
UPS (Uninterruptible Power Supply) provides instant battery backup while the generator spins up, then the generator takes over for sustained power.
What does 'pseudo-ANI' refer to in wireless 9-1-1 call handling?
Answer: A temporary number assigned to a wireless 9-1-1 call for routing and callback purposes
Pseudo-ANI is a 10-digit number assigned to a wireless 9-1-1 call — not the caller's actual number — used by the network to route the call and enable callbacks.