Operating Manual

March 2008 5100 ES Models II/III Portable Radio Operating Manual 6-19
SMARTNET / SmartZone / P25 Trunked Features
The result of this operation is that all radios with the same programmed home site are
forced to the home site to communicate which ensures that they can continue to
communicate. If the home site is not available, the Out-of-Range condition tells the user to
attempt communication on another system or by some other means.
6.13.7 P25 Wide Area Scan
This feature is intended to enhance roaming performance, especially when system level
steering through radio or talk group permissions is used.
With this option enabled on a talk group, as the talk group affiliates with a site, that site is
saved if the radio is changed to a new talk group. When the radio moves back to the Wide
Area Scan talk group, it will attempt to affiliate on the saved site before looking for a new
site.
6.13.7.1 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 7 (or 15) adjacent sites 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 by the PC Configure programmer.
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 by the PC
Configure programmer.
Full Spectrum CC Scan - If the two preceding methods do not locate a control
channel, every channel available to the radio is searched.
6.13.7.2 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.
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.