GAI-Tronics IDR1000A, User And Installation Manual

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Definitions and Acronyms
Term Definition
CSQ
Carrier squelch
CTCSS
A means of grouping users of a common radio channel. Subaudible tones are transmitted
with audio; a particular radio’s speaker (or the speakers of a group of radios) will unmute
to broadcast a transmission only if the associated subaudible tone identifies it as
belonging to the radio's user group.
CDCSS
A system analogous to CTCSS but using low speed digital signaling instead of subaudible
tones.
HLGT
High level guard tone
LLGT
Low level guard tone
PTT
Push-to-talk