E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

7-7

If the Clear/Secure switch is not programmed, the radio is always in the last known state 
(usually Clear) and there is no way to change it. For example, if the last known state is 
Clear and this parameter is not selected, it is never possible to transmit a Secure message 
on a channel strapped Secure because all that happens is transmitting is disabled, an error 
tone sounds, and “SEC ONLY” (Standard Control Head) or “Secure Only” (Lightning 
Control Head) is displayed.

The default security settings that determine how encryption keys are used for talkgroups 
and channels can be changed for different operating modes.

Conventional digital (P25), Smartnet/Smartzone and P25 Trunking encryption strapping is 
programmed on a “per talkgroup” basis. However conventional digital and P25 trunking 
talkgroup encryption strapping can be overridden on a “per channel” basis.Therefore, if 
desired on Conventional Digital and P25 Trunking channels, encryption can be 
programmed differently for each channel. 

If the radio is in failsoft or is dynamically regrouped, the radio will behave as it always 
has. That is, the radio will use any key to decrypt a received call and will transmit using 
switched strapping and the key PID specified as originally programmed.

If the radio is group regrouped, most functionality is retained. The radio will continue to 
use the key PID specified (as programmed) or use any key to decrypt a received call. The 
radio will use the keys based on programming values for Failsoft, Patch, Unit Call, 
Interconnect, and Dynamic TG: when the radio is in these modes, the radio will not use the 
strapping of the current channel. This means that if the channel has the override feature 
enabled, the strapping specified in this section will be used for the channel. If the override 
feature is not enabled, then the strapping of the currently selected talkgroup will be used.