User`s guide

350
Continuous Assignment
Updating
The ability of the Motorola Trunked system to ensure that a radio just
coming into service will be sent to the appropriate voice channel to
join the rest of the Fleet, Subfleet or Talkgroup. Once a group has been
assigned a voice channel, the control channel will continue to
transmit the voice channel information for that call for the duration
of the call.
Control Channel One of the four highest frequencies in a Trunking system that is used
to provide a continuous two-way communications path between
Central Controller and all radios on the system.
Crystal Aging The natural process by which the resonant frequency of a crystal
changes with time.
DES Encryption A method of encryption that contains 7.2 x 10
16
encryption keys. It
was originally developed for the US Federal Government and is used
to protect the security of confidential radio communications.
DES-XL Encryption A method of encryption that contains 7.2 x 10
16
encryption keys. It
was originally developed for the US Federal Government and is used
to protect the security of confidential radio communications
DOS Computer’s disk operating system. Also see “Data Operated Squelch”.
DPL Digital Private-Line™ Coded Squelch. A continuous sub-audible data
signal that is transmitted along with a carrier. A radio that has DPL on
the receive frequency will require both the presence of carrier and the
correct DPL code before it will unmute. In addition, if the radio has
DPL on the transmit frequency, the DPL code will be continuously
relayed during transmissions made on that channel.
DTMF Acronym for Dual-Tone Multiple Frequency signaling format, widely
used in the telephone industry. Two tones are transmitted
simultaneously at different amplitudes for each keypad key pressed. A
sequential series on Dual Tone makes a data word.
DVI-XL Encryption A method of encryption that contains 1.8 x 10
19
encryption keys. It
features a Motorola-proprietary algorithm and is used to protect the
security of confidential radio communications.
DVP See “Digital Voice Protection”.
DVP Encryption A method of encryption that contains 2.36 x 10
21
encryption keys. It
features a Motorola-proprietary algorithm and is used to protect the
security of confidential radio communications.
DVP-XL Encryption A method of encryption that contains 7.9 x 10
28
encryption keys. It
features a Motorola-proprietary algorithm and is used to protect the
security of confidential radio communications.
Data Numerical information which tells the radio what to do.
Data Operated Squelch (DOS) A fast attack MDC-1200 detector. If enabled, DOS will detect an
incoming packet of the same signalling scheme as the radio and
squelch the audio (i.e., mute the audio path) for the duration of the
packet. A small blip of data will be heard but most of the packet will
not be heard.