SRM9020 ~ Trunked Operating Instructions
© Comgroup Australia 2010 Page 23 TNM-U-E-0012 Issue 2a
PMR
Private Mobile Radio. Also used to refer to the class of non-
trunked radios.
Prefix
A larger division of mobile identities that is subdivided into
Fleets.
PSTN
Public Switched Telephone Network — the telephone system.
PTT/Pressel
Press-to-Talk. Hold down the Press-to-talk switch on the
microphone for the duration of the transmission.
RF
Radio Frequency.
SDM
An Alphanumeric Short Data Message sent to/from the radio.
Status
Message
A number code that transmits the “status” of the mobile to the
controller automatically. The number refers to a pre-
programmed text message.
Traffic
Channel
A radio channel used for sending speech transmissions.
A traffic channel is only allocated for the duration of the call. It
then becomes available for use by others.
Trunked
Operation
The automated sharing of a number of channels between a
larger number of users.
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