TB9100/P25 CG/P25 TAG Installation and Operation Manual P25 Glossary 151
© Tait Limited March 2014
channel
A channel is:
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).
3. A set of configuration information that defines the frequency pair and other
related settings (a channel configuration). ‘Channel’ has this meaning in the
CSS.
channel coordinator
A software module within the reciter or gateway module that propagates
dispatcher channel control commands to the channel group. The channel
coordinator also ensures that all channel group members have consistent states
so that they work together properly.
channel group
A channel group is a single logical channel consisting of a set of base stations.
Console gateways can also be members. The members of a channel group are
linked by an IP network and share a common multicast IP address.
channel module
Channel module is a common term used to refer to reciters and gateway
modules. Base Stations have reciters and gateways have gateway modules.
channel profile
A channel profile is a named group of configuration settings that help to define
the properties of a channel. Each channel in the channel table must have a
channel profile assigned to it.
channel seize
Channel seize is a signal received at the analog line interface, requesting the base
station
or console gateway to accept the signal on the analog line as an input
into the channel group. An asserted E-line, LLGT, or LLGT following
MDC1200 signaling can function as a channel seize signal.
channel spacing
Channel spacing is 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 channel table is the base station’s database of channel configurations.
CKR
The CKR (common key reference) is a number used by the key fill device and
by the CSS to indirectly refer to an encryption key without using its Key ID or
Algorithm ID.
circuit domain
The part of the base station processing functionality that processes speech signal
as a continuous stream of bits – a digital circuit. The opposite of packet domain.
community
repeater
Repeater that is shared by several user groups.
CODEC
A device which combines analog-to-digital conversion (coding) and digital-to-
analog conversion (decoding).
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