TRANSCEIVER OPERATION
2-8
November 1999
Part No. 001-7780-500
ation). Monitoring before transmittingmay not occur
automaticallyin this mode, so the channel may have to
be manually monitored beforetransmitting (see
Section 2.4.3). Selecting a conventional channel
selects a transmit and receivefrequency and other
parameters such as Call Guard squelch coding.
SMARTNET/SmartZone Operation
This is a trunked operating mode that uses ID
codes to select which mobiles are being called and
which calls are received. Monitoringis performed
automatically and special messagesand tones indicate
busy and out-of-range conditions.Enhanced features
include roaming (SmartZone only),telephone, private,
and emergency calls, CallAlert, and messaging. Oper-
ating features unique to SMARTNET/SmartZone
channels are described in Section2.5.
This radio supports only the SMARTNETII
trunking protocol. It does not supportthe SMARTNET
I (also referred to as Type I) protocol. When a
SMARTNET or SmartZone channel is selectedor the
radio is powered up on a SMARTNET/SmartZone
channel, it searches for a control channeland attempts
to register on the radio system. Once a control channel
is found, the alias (name)of the selected channel is
displayed. If a control channel could not be found
(because of an out of range conditionor the system ID
is not correct, for example), “NO SYS” is displ ayed
and the radio continues to searchfor a control channel.
The control channel transmits and receives
system information to and from all radi os 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. Th er adio
automatically changes toa traffic channel to placeand
receive calls and then returns to the control channel
when the call is complete.
2.4 CONVENTIONAL FEATURES
2.4.1 INTRODUCTION
The following information describesfeatures
unique to the conventional operating mode (de scribed
briefly in Section 2.1.2).Refer to Section 2.3 for infor-
mation on features common to all operatingmodes,
andtoSection2.5forinformationonfeaturesunique
to the SMARTNET/SmartZone mode.
2.4.2 DISPLAY MODE SELECTION
If the Displayed Information option switch is
programmed, the display mode used to indicate
conventional channels can beuser selected. Pressing
this switch cycles between the following modes. The
selected mode does not change whenpower is turned
off. If the Displayed Information option swi tch is not
programmed, the Alias mode is alwaysused.
Alias - The preprogrammed alphanumeric tag for the
channel is displayed.
Number - The channel number from 1-16 is
displayed.
Frequency - The receive frequencyof the selected
channel is displayed in megahertz.
2.4.3 MONITORING BEFORE TRANSMITTING
With conventionaloperation, channels are moni-
tored automatically or manuallyas follows:
Automatic Channel Monitoring
If the selected channel is programmed for the
Busy Channel Lockout feature, monitoring is
performed automatically.Refer to the description of
this feature in Section 2.4.5 for more information.
Manual Channel Monitoring
The automatic monitoring just described may not
be programmed or it may occasionally disable the
transmitter even if the channel is not in use. In this
case, the channel must be monitoredmanually as
follows:
Rx Indicator - With scanning disabled,note if the
green RX indicatoron the top panel is on. If it is not,
the channel is not being used and the call can be
transmitted. If it is on, a carrier is be ing detected, so
the channel may be busy (see next paragraph).
Monitor Mode - There may be times when the busy
indication is displayed even thoughno one is using
the channel. Monitoring shouldthen be performed
by disabling Call Guard squelch using the Norma l/
Selective option switch as described in Section
2.4.6 or the monitor mode describednext.