GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 171)

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Definitions and Acronyms
Term Definition
CSQ Carrier squelch
Capcode The identifying number on the outside of the radio pager. It is related to the tone or
digital code that gives the address and other information about this particular pager.
Carrier
Squelch Detection of a valid mobile signal is based on loss (squelch) of random channel noise.
CTCSS Continuous Tone Controlled Subaudible System – 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 Continuous Digital Coded Squelch System – A system analogous to CTCSS but using
low speed digital signaling instead of subaudible tones.
Diagnostics Tests to determine if any hardware or software problems exist.
DPL
DTMF Dual-Tone, Multi-Frequency – is a method used by the telephone system to
communicate the keys pressed when dialing. Pressing a key on the phone’s keypad
generates two simultaneous tones, one for the row and one for the column.
HLGT High level guard tone
LLGT Low level guard tone
Plectron
Patch A term synonymous with interconnect
PTT Push-to-talk – a switch, which when pressed, causes the radio to transmit.
RX, Receive To accept a signal from a radio.
TPL
TX,
Transmit To send a signal to a radio.
Squelch A system that prevents audio from being heard when no signal is being received.