E F Johnson Company 2425341 Benutzerhandbuch

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SECURE COMMUNICATION (ENCRYPTION)
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Secure - All calls are made in the selected secure 
mode. 
Switched - The mode is selected by the C/S (Clear/
Secure) option switch. When the clear mode is 
selected by this switch, “CLEAR” is flashed, and 
when the secure mode is selected, “SECURE” is 
flashed.
If the channel has been strapped “Clear” and the 
option switch selects the “Secure” mode on power up 
and a transmission is attempted, “Clear Only” is 
displayed and transmitting is disabled. Likewise, if the 
channel is strapped “Secure” and the option switch 
selects the “Clear” mode on power up and a transmis-
sion is attempted, “Secure Only” is displayed and the 
transmitter is disabled. 
The radio can be programmed to ignore the 
“Clear” or “Secure” switch setting* (“Ignore Clear/
Secure Switch When Strapped” selected on Global 
screen). These preceding indications then do not occur 
and transmissions always occur in the strapped mode.
NOTE: If all channels/talk groups are strapped clear 
or secure and no C/S (Clear/Secure) option switch is 
programmed, this parameter must always be selected 
(see following).
If the C/S (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” is 
displayed.
11.3.2  RECEIVE MODE OPTIONS
The following receive options can be 
programmed with conventional operation. With 
SMARTNET/SmartZone and P25 Trunked operation, 
encrypted calls are received if the proper key is 
programmed.
No Autodetect - Only signals coded like the transmit 
signals are received.
Secure Autodetect - Both clear and secure signals are 
automatically detected. This mode is automatically 
selected if the transmit mode is switch selectable.
Proper Key Autodetect
Analog Channels
When this feature is disabled and a message is 
received with the wrong key, the audio unmutes 
and garbled (encrypted) audio is heard. However, if 
this occurs with this feature enabled, the audio 
remains muted. 
Digital Channels
When this feature is enabled and a message is 
received with a different key, but the key resides in 
the radio, the audio is decrypted and received 
normally even though the key is assigned to a 
different talk group. If this feature is disabled or the 
key does not reside in the radio, the audio remains 
muted.
11.3.3  TALK GROUP ENCRYPTION OVERRIDE
On conventional digital (P25) channels, the 
encryption strapping mode and PID are programmed 
on a per talk group basis similar to the trunked modes 
(SMARTNET/SmartZone/P25 Trunked). However, 
with this mode only, there is the option to override the 
talk group encryption programming and program it on 
a per channel basis. Therefore, if desired on conven-
tional digital channels, encryption can be programmed 
differently for each channel. Conventional analog 
channel encryption is always programmed on a per 
channel basis. 
11.3.4  ENCRYPTION ICON OPERATION
Basically, the encryption icon 
 is on whenever 
a secure call is received or transmitted. Other 
operation is as follows:
With standard front and remote mount control 
units* and the HHC (Handheld Control Unit), it 
flashes when receiving a secure call on a digital 
channel in both the secure and clear modes. 
It is on when receiving a clear call on a digital 
channel in the secure mode. 
With Version 3.17 or later control unit firmware.