User's Manual

GENERAL OPERATION
18
Revised August 2002
Part No. 001-5300-007CD-NR
Secure Autodetect - Both clear and SecureNet signals
are automatically detected. This mode is automati-
cally selected if the transmit mode is switch selectable.
Proper Key Autodetect - An incoming SecureNet
call is compared against all of the available keys
programmed into the radio. If a match is found, the
call is decrypted using matched key.
3.19 TRANSCEIVER OPERATING MODES
3.19.1 GENERAL
Each selectable channel can be programmed for
the conventional, SMARTNET/SmartZone, or Project
25 (digital) trunked operating mode. For example,
Zone 1/Channel 1 could be a conventional channel,
Zone 1/Channel 2 a SMARTNET channel, and so on.
Consult your system operator to determine the type or
types of operation programmed in your transceiver.
More information on these modes follows.
3.19.2 CONVENTIONAL MODE
This is a non-trunked operating mode which
accesses independent radio channels (there is no auto-
matic access to several channels). Selecting a conven-
tional channel selects a transmit and receive frequency
and other channel parameters such as squelch control
coding.
Conventional channels can be either standard
(analog) or Project 25 (digital). With digital operation,
the DSP (Digital Signal Processor) converts the audio
signal to digital data which is sent over the air as
complex tones. Another difference is that analog chan-
nels use Call Guard (CTCSS/DCS) squelch control
and Project 25 channels use a NAC (Network Access
Code) and talk group ID codes.
With NAC, a number similar to an ID code is
transmitted, and for communication to occur, it must
match one programmed in the base equipment and the
mobile(s) being called. In addition, to receive stan-
dard group calls, the receiving mobile(s) must be
programmed to detect the transmitted ID code.
With conventional operation, a busy channel
condition is detected automatically if the busy channel
lockout (transmit disable on busy) feature is
programmed. Otherwise, it must be detected manually.
An out-of-range condition is not indicated by special
tones or messages as with SMARTNET operation
because there is no initial data exchange with the
repeater that allows this condition to be detected.
Operating features unique to conventional channels
are described in Section 4.
3.19.3 SMARTNET/SMARTZONE MODE
This is a trunked operating mode in which auto-
matic access is provided to several RF channels. ID
codes are used to select what mobiles are being called
and what calls are received. Monitoring is performed
automatically and special messages and tones indicate
busy and out-of-range conditions.
SMARTNET and SmartZone operation and
programming is very similar. Basically, SMARTNET
operation is limited to a single repeater site and Smart-
Zone operation allows automatic roaming between
sites. Enhanced features include roaming (SmartZone
only), telephone, private, and emergency calls, Call
Alert
™
, and messaging. Either analog or digital
signaling may be used.
When a SMARTNET or SmartZone channel is
selected or the radio is powered up on one of those
channels, it searches for a control channel. Once a
control channel is found, the alias (name) of the
selected channel is displayed and the radio attempts to
register on the radio system. If a control channel could
not be found (because of an out of range condition or
the system ID is not correct, for example), “NO SYS”
is displayed and the radio continues to search for a
control channel.
The control channel transmits and receives
system information to and from all radios registered on
the system. Therefore, once a control channel is found,
it is continuously monitored for incoming call infor-
mation and is used to make call requests. The radio
automatically changes to a traffic channel to place and
receive calls and then returns to the control channel
when the call is complete.
Operating features unique to SMARTNET/Smart-
Zone channels are described in Section 5.