E F Johnson Company 2425M70 Benutzerhandbuch

8-18

Clear/Secure Select - This enables and disables encryption regardless of whether 
OTAR is used. Refer to Section 8.3 for more information.

Erase Keys - Erases all TEK and KEK keys contained in the radio.

Key Select - This allows a different key to be selected for the current channel or group 
(conventional channels only). Refer to Section 8.2.4 for more information.

OTAR Rekey Request - Sends a message which tells the KMF that the radio is on the 
air and requests rekeying. The following status messages are displayed which indicate 
the progress of this function.

Rekeying - A radio-initiated rekeying session is in process.

No Ack - No response was received from the KMF in response to an Identify request 
before time out occurred (approximately 30 seconds).

Ack Rcvd - An acknowledgement was received in response to an Identify request.

No Service - A “No Service” reply was received from the KMF. No rekeying will take 
place.

Rekey Fail - Either the rekey command failed or timed out (after approximately 30 
seconds). This message could indicate that the rekey request message was not received 
by the KMF. However, depending on the KMF configuration and channel traffic, it is 
possible that the message was received and a response is still pending.

Rekeyed! - The rekey session initiated by the radio was successful.

There are two different P25-data related icons which indicate if the radio is on a trunking 
system. One indicates whether or not you are on a data channel, and one indicates whether 
or not you have successfully data registered (i.e., whether or not you were granted an 
SNDCP data context by the system). The icons appear to identical, except for their 
position on the display.

Over Button 2, this icon indicates P25 Data Context Activated – Radio is ready 
for data operations.
Over Button 3, this icon indicates Radio is operating on a data channel

Every time the radio goes to a data channel, the data channel icon will come on, and stay 
on, until the radio leaves the data channel. The radio goes to the data channel to do P25-
data related tasks, such as data register, OTAR register, and send and receive OTAR data.

You must have successfully data registered before you can successfully initiate an OTAR 
session. The usual sequence when the radio is attempting to data register will be:

- The data channel icon comes on.

- The data context icon comes ON (once we successfully data register).