E.F. Johnson Company 53SL ES Series, Руководство по эксплуатации

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53SL ES Series Mobile Radio Operating Manual April 2009 7-15
SMARTNET / SmartZone / P25 Trunked Scanning Features Section 7 - SMARTNET / SmartZone / P25 Trunked Features
7.11 SMARTNET / SmartZone / P25 Trunked Scanning Features
Scanning on a SMARTNET/Smartzone or P25 Trunked system is called Priority Monitor
Scan. The following are unique features of this type of scanning. For general scanning
information applicable to all operating modes, refer to Sections 5.12 and 5.13.
• Scanning is turned ON and OFF by the Scan option switch (or selecting the menu
parameter). Talkgroups (channels) can be programmed so that scanning automatically
starts whenever the talkgroup is selected (Autoscan).
• When responding to calls in the scan mode, the programming of the Talkback Scan
parameter determines if a response always occurs on the talkgroup of the call (Active
Group) or the Selected Group if they are different. Transmissions at other times always
occur on the selected talkgroup.
• Up to 255 scan lists or the number that fit in available memory can be programmed.
Each list can include the number channels/talkgroups (enabled for your radio) from the
same system, one of which can be a priority group as described in the next section.
• If the Scan List Edit option key is programmed (or if the menu option is selected), scan
lists are user programmable (see Section 7.11.2). In addition, nuisance channels can be
temporarily deleted as described in Section 5.12.5.
• Each talkgroup is programmed to select one of the programmed scan lists or “NO LISt”
(scanning is disabled). If scanning is enabled and the selected channel does not permit
scanning, it is automatically enabled again when a channel is selected that permits
scanning.
• The selected scan list can be temporarily changed if the Scan (List) Select option switch
is programmed. The procedure is described in Section 7.11.2.
• In addition to calls on channels in the scan list, pages, private/unit calls, and telephone
calls are received while scanning. Private and telephone calls are not interrupted by
priority messages.
• P25 Trunking allows two Priority talkgroups per list.
Every radio on the system has to register with the Zone or Site Controller so that the
system knows where everyone is and if traffic from one site needs to be sent to another
site. This is determined by the list of Talkgroups registered with the radio.
When a call needs to be passed to a radio at another site, the traffic from one site to
another is then sent out over the control channel to the radios. When a radio is scanning, it
is monitoring the call information being sent out over control channel. The radio compares
the call information (Talkgroup and voice channel handling the Talkgroup) to the scan list
to see if any of the Talkgroups it is scanning are receiving a call. If it finds a match, the
radio moves to the voice channel for this call. If no one is registered on that Talkgroup on
the Site being scanned, the call information for the call is not sent out by the control
channel because the Zone or Site Controller did not see a requirement to pass this
information for this call and the call will not be received.