Motorola ASTRO XTL 5000 Basic Service Manual page 93

Encryption: Over-the-Air Rekeying
7.6 Over-the-Air Rekeying
The over-the-air rekeying (OTAR) feature allows the dispatcher to reprogram the encryption keys in
the radio remotely. The following steps describe how to use this feature.
1. Press the menu button labeled REKY. Alternatively, press and hold the menu button labeled
SEC until a tone sounds. Then press REKY on the second menu that is displayed. If REKY or
SEC is not on the current menu, use the NAV key to scroll through the available menus.
REQUEST REKEY is displayed.
2. Press the PTT button to send the rekey request.
PLEASE WAIT is displayed.
One of the following occurs:
The radio sounds five tones when the dispatcher has received the request.
NOTE: Any subsequent press of the PTT button will exit the OTAR feature and allow you to transmit
in the normal manner. Pressing the HOME or emergency button also exits the feature.
If the display momentarily shows REKEY FAIL and the bad-key tone sounds, then the rekey
operation failed because the radio does not contain the Unique Shadow Key (USK) or Unique Key
Encryption Key (UKEK). You have to load the USK into the radio using the KVL before the radio can
be reprogrammed over the air.
NOTE: If you exit at this point, but stay on the current channel in the dispatch mode, the radio
momentarily shows REKEYED or DENIED and sounds a tone indicating the status of the rekey
request.
If the display shows NO ACK and the bad-key tone sounds, then the dispatcher has not
acknowledged your request after the radio has tried five times to send it. The radio then returns to
the display message in step 1, allowing you to retry the request.
If the request is accepted and the radio is successfully rekeyed, the display momentarily shows
REKEYED.
If the display momentarily shows DENIED and the bad-key tone sounds, the request has been
denied by the dispatcher, and the radio returns to the home display.
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October 30, 2006