User's Manual

118 Glossary TB9300 Installation and Operation Manual
© Tait Limited June 2016
call
A complete exchange of information between two or more parties. A call
requires a receive signal path and a transmit signal path. In conventional
systems, a call is an over, but in trunked systems, a call may be a
conversation, made up of a number of overs.
channel 1. A path through which signals can flow.
2. In the RF domain, a frequency pair (or just a single frequency in a
simplex system). Also called a physical channel in this manual.
3. One of the two timeslots that DMR provides for each radio frequency
(physical channel). Refer to “logical channel”.
4. A set of configuration information that defines the frequency pair and
other related settings (a channel configuration). “Channel” has this
meaning in the web interface.
channel spacing The bandwidth that a channel nominally occupies. If a base station has a
channel spacing of 12.5 kHz, there must be a separation of at least 12.5 kHz
between its operating frequencies and those of any other equipment.
channel table The base station’s database of channel configurations.
CODEC A device which combines analog-to-digital conversion (coding) and
digital-to-analog conversion (decoding).
colour code A marker determining which transmitted signals are gated. Inbound
messages must carry this code to be listened to. The colour code is
configured at the Node Controller. It can prevent interference from other
networks and define private talkgroups.
configuration file Consists of all the configuration settings needed for a base station, stored
as a file.
conventional
network
Systems that do not have centralized management of channel access.
System operation is entirely controlled by system end users.
CTCSS CTCSS (continuous tone controlled squelch system), also known as PL
(private line), is a type of signaling that uses subaudible tones to segregate
groups of users.
CWID Continuous Wave Identification is a method of automatically identifying
the base station using a Morse code. Continuous wave means transmission
of a signal with a single frequency that is either on or off, as opposed to a
modulated carrier.
DAC Digital-to-Analog Converter. A device for converting a digital signal to an
analog signal that represents the same information.