Tyco Electronics P5200 사용자 설명서

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The Private Mode allows the radio to transmit encrypted messages and receive clear or private 
transmissions. The radio transmits private if the group/channel is programmed for private operation and 
forced operation is pre-programmed. If autoselect operation is pre-programmed and the radio is in the 
Private Mode, the radio transmits in the mode of the received call if the hang time is active. If no hang 
time is active, the radio transmits private.  

Cryptographic keys are transferred to the radio using a cryptographic Keyloader. Up to seven (7) different 
cryptographic keys, numbered 1-7, can be transferred from a Keyloader and stored in the radio. An 
individual key is automatically selected on a per-group/channel basis according to the radio programming. 
Groups and channels within the digital system can be programmed for keys 1-7 (private). Up to 8 banks 
of 7 keys can be stored for private systems. The bank is specified per system.  

When operating on a group or channel programmed for Private Mode, all transmissions are private 

transmissions and the radio receives clear and private signals. The status icon   is displayed when the 
Private Mode is enabled. If the selected group or channel is programmed for auto-select capability, the 

mode may be toggled between private and clear with the 

 key, then following the selection mode rules. 

Radios programmed for forced private operation do not allow a change of the transmit mode. 

To Display the Currently Used Cryptographic Key Number for either the system encryption key (for 
special call such as individual, phone, all, agency or fleet) or the group/channel key (for group or 
conventional calls), perform the following procedure: 

1.  Press the 

 button. 

2.  Use the 

 or 

 button to select "DISP KEY." 

3.  Use the 

 or 

 button to toggle between displaying the system key (Figure 10-8) or the 

group/channel key (Figure 10-9). 

 

 

All cryptographic keys can be zeroed (erased from radio memory) by pressing the 

 button and while 

still pressing this button, press and hold the OPTION button. Press both buttons for 2 seconds. A series of 
beeps will begin at the start of the 2 second period and then switch to a solid tone after the keys have been 
zeroed. The display will indicate 

KEY ZERO

.