E.F. Johnson Company 53SL ES Series, Руководство по эксплуатации

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53SL ES Series Mobile Radio Operating Manual April 2009 8-5
Clear / Secure Strapping Section 8 - Secure Communication (Encryption)
8.2.5 Encryption Key Erase
A KY CLR option switch can be programmed that allows the user to permanently erase all
stored keys. If OTAR TEK and KEK keys are stored, all keys of both types are erased.
This function can be used to ensure that unauthorized encrypted calls can no longer be
placed or received by a radio.
On a mobile radio, you must press the erase keys button twice within a small period of
time for the keys to be erased.
8.2.6 Encryption Icon Operation
Basically, the encryption icon is ON continuously whenever a secure call is received
or transmitted. Other operation is as follows:
• The icon is always displayed when the radio is in secure mode and receives a clear call
on a digital and P25 trunking channel.
• It is not displayed when receiving a clear call in the secure mode on an analog channel.
• An option can be programmed to sound a beep whenever a secure call is received on a
clear channel.
8.3 Clear / Secure Strapping
Certain options are available when transmitting and receiving when encryption is selected.
8.3.1 Transmit Mode Options
The following transmit options are available when encryption is selected:
“ Clear ” - All calls are in the clear mode.
“ Secure ” - All calls are made in the selected secure mode.
“ Switched ” - The mode is selected by the Clear/Secure switch. When the clear mode is
selected by this switch and a secure call is received, or vice versa, you will hear a beep.
Press the programmed option button to change to the appropriate mode. When the clear
mode is selected by this switch, “CLEAR” is flashed, and when the secure mode is
selected, “SECURE” is flashed.