Glossary of Terms

Understand basic Public Safety definitions and terms.

Busy Tone

Definition:

The sound provided to a caller to indicate the desired destination is unavailable. (60 IPM (interruptions per minute).)

Traceroute

Traceroute is a network diagnostic tool used to track the pathway taken by a packet on an IP network from source to destination in real time,...

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Alternate PSAP

An Alternate PSAP is designated to receive 9‐1‐1 calls if the call cannot be delivered to the primary PSAP.

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Alternate Routing

A method by which 9‐1‐1 calls are routed to a designated alternate location if all IEN or wireless lines to the primary PSAP are busy, or the primary...

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Back-Haul

A communications path that takes traffic farther than the ultimate destination and then routes it back. The cost of transmission to the more remote...

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