Tyco Electronics P5400 manual System Encryption Key Display

MM-012099-001, Rev. B

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 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 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 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.

10.16.3.1 Displaying the Currently Used Cryptographic Key Number

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 key (for group 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 10-11)or the group/channel key (Figure 10-12).

Figure 10-11: System Encryption Key Display

Figure 10-12: Group/Channel Encryption Key Display

10.16.3.2 Key Zero

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.

If the cryptographic key(s) are zeroed, one or more keys must be transferred from the Keyloader into the radio before private communications may continue.

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