Nortel Networks operation manual Glossary, RTU-292 Operations Manual, JPS Communications, Inc

RTU-292 Operations Manual

	Glossary
Adaptation	The process whereby the RTU-292 DSP algorithms detect reflected signal information in a
	connected line and tune the DSP hybrid for a broadband null with minimum reflection.
COR	Carrier Operated Relay - A receiver signal that gives a positive indication that a carrier or signal
	is being received and that the receiver is unsquelched. Same as COS.
COS	Carrier Operated Squelch - See COR.
CTCSS	Continuous Tone Controlled Squelch System. A squelch system using EIA Standardized sub-
	audible tones in the 67Hz to 250Hz frequency range. An FM squelch which opens only when
	the proper sub-audible tone is present.
DIP Switch	Dual In-Line Package Switch (Also “dipswitch”)- A multi-unit switch that fits into a standard
	DIP integrated circuit footprint. It usually contains eight or ten individual switches.
DTMF	Dual Tone Multi Frequency - The standard touch-tone telephone dialing method.
DSP	Digital Signal Processing (or Processor).
EIA	Electronic Industries Association.
Full Duplex	A communications system that can operate in transmit mode and receive mode simultaneously,
	with different frequencies for transmit and receive. See also Half Duplex and Simplex.
Half Duplex	A communications system that uses different frequencies for transmit and receive operation, but
	can not transmit and receive at the same time. See also Full Duplex and Simplex.
Hangtime	A system with hangtime will remain in the transmit mode for the duration of the set hangtime
	beyond the time indicated by any keying inputs. The hangtime prevents transmitter unkey
	during brief pauses in the transmission.
Key	To key a transmitter means to cause it to transmit.
LED	Light Emitting Diode.
LMR	Land Mobile Radio.
Mute	To quiet or inhibit audio.
PCB	Printed Circuit Board.
PTT	Push-to-Talk. An active PTT signal causes a transmitter to key.
RX	Receiver or Receiving.
Simplex	A communications system that uses the same frequencies for both transmit and receive
	operation. A simplex system can obviously not transmit and receive simultaneously. See also
	Full Duplex and Half Duplex.
SNR	Signal-to-Noise Ratio.
Squelch	A means of detecting audio and causing some action when it is present, such as keying a
	transmitter or unmuting an audio path.
TX	Transmit or Transmitter.
VMR	Voice Modulation Recognition. A type of squelch, which is activated only by spoken words and
	not by tones, noise, or other audio information.
VOX	Voice Operated Xmit (Transmit). A circuit or algorithm that causes a transmitter to key or some
	other action when voice or other signal is present. This squelch type is activated by any audio
	signal, and is not restricted to voice only.

9 JPS Communications, Inc.