User's Manual

CONVENTIONAL FEATURES
19
Revised August 2002
Part No. 001-5300-007CD-NR
3.19.4 P25 TRUNKED MODE
The P25 Trunked operating features are very
similar to the SmartZone type just described. There-
fore, these modes plus SMARTNET are all described
in the same section (Section 5). Some diffferences
between the P25 Trunking and SmartZone modes are
as follows:
• Digital signaling is always used with P25 calls.
Either analog or digital signaling may be used for
SmartZone calls.
• Calls made to a specific mobile in the P25 mode are
called Unit Calls. In the SmartZone mode they are
called Private Calls.
• Messaging is not available with P25 calls.
• P25 Trunked telephone calls are not be available
until a future release.
• The P25 control channel data rate is 9600 baud and
the digital voice data rate is also 9600 baud. With
SmartZone operation, the control channel data rate
is 3600 baud (both digital and analog calls) and the
narrowband digital voice data rate is 9600 baud.
• The P25 mode uses a system ID, a Wide Area
Communications Network (WACN) ID, and an RF
Subsystem ID (RFSS). The SmartZone mode does
not use the WACN and RFSS IDs.
• P25 Unit IDs can be 1-16,777,215 (000001-FFFFFF
hex) and SmartZone Unit IDs can be 1-65,535
(0001-FFFF hex).
SECTION 4 CONVENTIONAL FEATURES
4.1 INTRODUCTION
An overview of the conventional operating mode
is located in Section 3.19.2. The following information
describes the features unique to conventional standard
(analog) and Project 25 (digital) operation. Refer to
the preceding “General Operation” section (Section 3)
for information on features common to all operating
modes.
4.2 MONITORING BEFORE TRANSMITTING
With conventional operation, you may need to
manually monitor the channel before transmitting to
make sure that it is not being used by someone else. If
you were to transmit while someone else was using the
channel, you would probably disrupt their conversa-
tion. With the trunked operating modes, channel moni-
toring is performed automatically. Monitor conven-
tional channels automatically or manually as follows:
Automatic Channel Monitoring
If the selected channel is programmed for Busy
Channel Lockout (also called Transmit Disable On
Busy) feature, monitoring is performed automatically.
Refer to Section 4.4 for more information on this
feature.
Manual Channel Monitoring
The automatic monitoring just described may
occasionally disable the transmitter when the channel
is not in use, such as when the repeater has extended
hang time. In this case, you may not want to use it and
the channel must then be monitored manually as
follows:
Busy Indicator - With scanning disabled, note if the
multi-function indicator on the front panel is steady
green. If it is not, the channel is not being used and
you can transmit your call. If it is green, a carrier is
being detected, so the channel may be busy (see next
paragraph).
Monitor Mode - There may be times when the busy
indication is displayed even though no one is using the
channel. Monitoring should then be performed by
disabling Call Guard squelch (or group ID detect on
P25 channels). This is usually done by selecting the
Monitor Mode (see following).
4.3 MONITOR MODE
The monitor mode unsquelches the receiver even
if a carrier is not detected. Therefore, it can be used for
such things as monitoring a channel for all activity