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Motorola ASTRO APX O2 Control Head Mobile Radio User Manual: Requesting An Over-the-air Rekey; Mdc Over-the-air Rekeying (otar) Page; Infinite Ukek Retention

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Press the Menu Select button directly below Sngl to delete
current shown key.
OR
Press the Menu Select button directly below Abrt to abort
this screen and return to Home screen.


Requesting an Over-the-Air Rekey

This feature, also known as OTAR, allows the dispatcher to
reprogram the encryption keys in the radio remotely. The
dispatcher performs the rekey operation upon receiving a rekey
request from the user.
Procedure:
>
<
(on the keypad mic.) to Rekey.
1
or
2 Press the Menu Select button directly below Rekey.
3 Press the PTT button to send the rekey request.
OR
Press the PTT button again, or the H or Emergency button,
to exit the feature and transmit in normal mode.
4 If the rekey operation fails, a bad-key tone sounds and the
display shows Rekey fail.
Note:
The rekey operation failure indicates that your radio
does not contain the Unique Shadow Key (USK). This
key must be loaded into the radio with the key-variable
loader (KVL) before the rekey request can be sent.
Refer to your local key management supervisor for
more information.


MDC Over-the-Air Rekeying (OTAR) Page

This feature allows to view or define MDC Over-the-Air
Rekeying (OTAR) features.It is applied only when operating in
secure encrypted mode and only for conventional
communications. In additional to Rekey Requests, OTAR
transmissions include Delayed Acknowledgements, and Power-
up Acknowledgements.
Some of the options selected may also need to be set up at the
Key Management Controller (KMC) site to work properly.
Note:
This feature must be preprogrammed by a qualified
radio technician. Check with your dealer or system
administrator for more information.


Infinite UKEK Retention

This feature enables Unique Key Encryption Key (UKEK) to be
permanently stored in the radio even when all of the encryption
keys is erased. Without this UKEK key, the radio could not be
over the air rekeyed.
Note:
This feature must be preprogrammed by a qualified
radio technician. Check with your dealer or system
administrator for more information.
81
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