E F Johnson Company 2425M70 Benutzerhandbuch

7-21

With the Zone Fail Site Lock feature enabled, the radio continues to roam normally when 
the system zone controller is active. However, if the zone controller fails, this is detected 
and the Zone Fail Site Lock mode is entered. The only site the radio is then allowed to 
operate on is its home site. If its home site is not available, “OUT-OF-RANGE” is 
displayed. A zone controller failure is detected by determining that every site in the 
dynamic site list is in Site Trunking. Currently, this condition must be detected for at least 
1 minute for the Zone Fail Site Lock mode to be selected.

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.

This feature is intended to enhance roaming performance, especially when system level 
steering through radio or talkgroup permissions is used.

The following control channel search methods are normally used to find a control channel:

Short Hunt - The dynamic array of 7 adjacent sites (SmartZone) or 15 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.

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.

Full Spectrum CC Scan - If the two preceding methods do not locate a control 
channel, every channel available to the radio is searched.

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.