E F Johnson Company 2425372 Benutzerhandbuch
Draft
December 2006
5300 ES Series Mobile Radio Operating Manual -17
6.13.8 Talkgroup Steering Via System Access Permissions
In order 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.
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.
The problem with this operation is that every time a different talk group is selected, the
access permission may be different and a different site may need to be accessed. This
could result, in a worst case, in a delay of up to 30 seconds in finding a new site. This
could occur if there are no valid sites for the new talk group in the dynamic site list.
access permission may be different and a different site may need to be accessed. This
could result, in a worst case, in a delay of up to 30 seconds in finding a new site. This
could occur if there are no valid sites for the new talk group in the dynamic site list.
6.13.9 P25 Wide Area Scan
A feature called Wide Area Scan can be programmed to minimize the problem just
outlined. This feature is programmed on the Talk Group list screen selected on the P25
System screen. When Wide Area Scan is selected, talk group site preferences are no
longer available. However, System Site Preference lists can still be used. The Wide Area
Scan feature functions as follows:
outlined. This feature is programmed on the Talk Group list screen selected on the P25
System screen. When Wide Area Scan is selected, talk group site preferences are no
longer available. However, System Site Preference lists can still be used. The Wide Area
Scan feature functions as follows:
1 Assume TG1 is selected. If it is the first time this talk group is selected, normal
searching for a control channel occurs according to the hunt methods
previously described.
2 When another talk group is selected, the active valid site for TG1 is stored in EEPROM
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
EEPROM memory.
EEPROM 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 talk group based access.
valid site, usually on the first try. This greatly reduces access time, even on systems which
have highly restricted talk group based access.