E F Johnson Company 2425M80 사용자 설명서
Draft 02 - Sep 1 2015
6-24
SMARTNET / SmartZone / P25 Trunked Features
1 Assume TG1 is selected. If it is the first time this talkgroup is selected, normal
searching for a control channel occurs according to the hunt methods previously
described.
described.
2 When another talkgroup is selected, the active valid site for TG1 is stored in memory.
3 The next time TG1 is selected, the following procedure is performed before performing
the normal hunt methods previously described.
a
The last valid site ID and its receive and transmit channel numbers are loaded from
memory.
memory.
b
The dynamic site list is checked to see if any newer receive/transmit channel
information is available for the last site ID.
information is available for the last site ID.
c
The best receive/transmit information is used and the radio checks to see if this
control channel is available.
control channel is available.
The result of the preceding operation is that the radio has a reasonable chance of finding a
valid site, usually on the first try. This greatly reduces access time, even on systems which
have highly restricted talkgroup based access.
valid site, usually on the first try. This greatly reduces access time, even on systems which
have highly restricted talkgroup based access.
With this option enabled on a talkgroup, as the talkgroup affiliates with a site that site is
saved if the mobile is changed to a new talkgroup. When the radio moves back to the Wide
Area Scan talkgroup, it will attempt to affiliate on the saved site before looking for a new
site.
saved if the mobile is changed to a new talkgroup. When the radio moves back to the Wide
Area Scan talkgroup, it will attempt to affiliate on the saved site before looking for a new
site.
6.14.7 Normal P25 and SmartZone Control Channel Hunt
The following control channel search methods are normally used to find a control channel:
Short Hunt - The dynamic array of 8 adjacent sites (SmartZone) or 16 adjacent sites
(P25 Trunking) is searched. This list is saved on power down and loaded again at power
up. It is erased whenever parameters are downloaded to the radio.
(P25 Trunking) is searched. This list is saved on power down and loaded again at power
up. It is erased whenever parameters are downloaded to the radio.
Long Hunt - If no valid control channel is located by the preceding short hunt method,
the radio searches the list of control channels programmed into the radio.
the radio searches the list of control channels programmed into the radio.
Full Spectrum CC Scan - If the two preceding methods do not locate a control
channel, every channel available to the radio is searched.
channel, every channel available to the radio is searched.
6.14.8 Talkgroup Steering through System Access Permissions
To use system channel resources more efficiently, some system operators are using system
access permissions to steer certain talkgroups to particular sites. For example, a police
department may be allowed to use only Site 1, and a public works department may be
allowed to use only Site 2.
access permissions to steer certain talkgroups to particular sites. For example, a police
department may be allowed to use only Site 1, and a public works department may be
allowed to use only Site 2.