Glossary of Terms

Understand basic Public Safety definitions and terms.

Wireless Telecommunications

Definition:

The family of telecommunications services under the heading of Commercial Mobile Radio Service. Includes Cellular,
Personal Communications Services (PCS), Mobile Satellite Services (MSS), and Enhanced Specialized Mobile Radio
(ESMR).

HSS

Home Subscriber Server (or Service).

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ESN

1. Emergency Service Number A three-digit number that is assigned to the caller's telephone number in the tandem office translations. The emergency...

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TOS

Type of Service.

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POTS

Plain Old Telephone Service.

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