E F Johnson Company 2425770 Benutzerhandbuch

Viking Portable 600 Radio Operating Manual

8-7

The following are the minimum parameters that need to be programmed in the radio to 
perform OTAR. It is not necessary to program a TEK to perform OTAR. If the radio does 
not contain a TEK, the KMF initiates a warm start sequence in which a temporary TEK is 
transferred to the radio to perform the key transfer.

UKEK - This key normally has SLN (CKR) 61440 and Key ID 62880 (F5A0 hex). 
Create a key (either AES or DES type as required) and download it to the radio. AES 
UKEKs typically use an SLN of 61442 and a Key ID of 62880 (0xF5A0).

Unit RSI - This is normally initially the same as the P25 Unit ID and is set by 
programming.

KMF RSI - This RSI is normally 9,999,999 and should not need to be loaded since it 
defaults to this number.

MNP (Message Number Period) - Load the proper message number period into the 
radio (typically 1000).

Verify that the above information was properly stored in the radio by viewing it using the 
keyloader.

The OTAR capabilities of the SEM equipped Viking VP600 radio are as follows. 

• Keysets

- Up to three keysets are used and it is assumed all three are always present. Keyset IDs 

1 and 2 are for TEKs and only one is active at a time. Keyset ID 255 is for KEKs and 
is considered active all the time.

- Each keyset can have up to 128 keys. However, 16 or less are normally used.

The following additional option buttons can be programmed with the Viking VP600 to 
control OTAR functions. They are also available as Viking Portable radio menu 
parameters unless noted otherwise.

Change Keyset - Toggles the active keyset between Keyset 1 and Keyset 2. The new 
active keyset is briefly displayed and then normal operation resumes. When the Viking 
Portable menu is used, the current active keyset is indicated by an asterisk. To change 
to the other keyset, highlight it and press the <F2> button.