Glossary

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Courtesy Tone

A short audible tone heard at the end of a repeater's transmit cycle.

DSL

Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. In telecommunications marketing, the term DSL is widely understood to mean asymmetric digital subscriber line (ADSL), the most commonly installed DSL technology, for Internet access. DSL service can be delivered simultaneously with wired telephone service on the same telephone line. This is possible because DSL uses higher frequency bands for data. On the customer premises, a DSL filteron each non-DSL outlet blocks any high-frequency interference to enable simultaneous use of the voice and DSL services.

More information is available here: https://en.wikipedia.org/wiki/Digital_subscriber_line

FCC

Federal Communications Commission

PTT

Push-to-Talk

Repeater

A repeater is a device that retransmits a received signal with more power and to an extended geographical or topological boundary than what would be capable with the original signal.

RF

Radio Frequency

VoIP

VOIP is an acronym for Voice Over Internet Protocol, or in more common terms phone service over the Internet.
If you have a reasonable quality Internet connection you can get phone service delivered through your Internet connection instead of from your local phone company.

More information: https://www.voip-info.org/wiki/view/What+is+VOIP