E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

7-8

If the override security settings feature is enabled, then the override parameters will be 
used. If the override feature is not enabled, then the talkgroup parameters will be used. If 
the Any Key option is disabled and a secure talkgroup call is received that uses a different 
key than the one specified, the radio will not unmute but will display the received call 
information.

If a secure component talkgroup call is received, the first check will be for the any key 
option as specified on the announcement group list. If the any key option is enabled, all 
secure traffic (both component talkgroups and the announcement group) will unmute 
provided the proper key is stored in the radio. If the any key option is disabled, then the 
radio will determine the key that the talkgroup is supposed to use by reading the 
programmed key PID from the talkgroup list. If the received key matches the expected 
key, then the component talkgroup call will unmute. If the keys do not match, then the 
radio will not unmute but will display the component talkgroup call information.

The settings specified on the announcement group list will be used. If the any key option is 
disabled and a secure announcement group call is received that uses a different key than 
the one specified, the radio will not unmute but will display the received call information.

Emergency talkgroup calls will not utilize the override settings, but will be subject to the 
any key rules specified above.

OTAR stands for “Over-the-Air-Rekeying”. This is the process of sending encryption keys 
and related key management messages over-the-air to specific radios. The advantage of 
OTAR is that it allows these keys to be quickly and conveniently updated when necessary. 
It is no longer necessary to periodically travel to the radio location or bring the radio into a 
maintenance facility to load new keys.