Operating Manual Part 15

October 2008 5300 ES Series Mobile Radio Operating Manual 3-9
General Operation
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
trunked 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” (early units) or “OUT
RNGE” (later units) 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 information and is used to make call requests. When the radio
is keyed, a channel grant request is sent through the control channel. The system then
informs the requesting radio what traffic channel to use, through the control channel. Once
the request is granted by the system, the radio moves to the designated traffic channel for
the actual talk group call. Once the transmission has ended, the radio returns to the control
channel.
Operating features unique to SMARTNET/SmartZone channels are described in
Section 6.
3.7.3 P25 Trunked Mode
The P25 Trunked operating features are very similar to the SmartZone type just described.
Since SmartZone features are also similar to SMARTNET features, all three modes are
described in Section 6. Some differences 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 radio in the P25 mode are called Unit Calls. In the
SMARTNET/SmartZone mode they are called Private Calls.
• Messaging is not available with P25 calls.
• Telephone calls are available in this mode.
• 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, Wide Area Communications Network (WACN) ID,
and 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).