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Currently, EFJohnson 41xx portables and 43xx 

mobiles that meet the following requirements support 
OTAR:

Programming - An RSI and UKEK and other infor-
mation must be programmed as described in the next 
section. 

10.5.2  ADDITIONAL SETUP FOR OTAR

The following parameters must be programmed 

for OTAR operation in addition to those in Section 
10.5.1 . 

1. On the Radio Wide Conventional screen, program 

the Digital Unit and Unit RSI IDs. The Unit RSI 
ID can be set to the Digital Unit ID only, but later 
can be changed by the KMF or keyloader if desired. 
Note these two numbers.

2. On the Per System Conventional screen, select 

OTAR Enabled = On and Data Registration 
Enabled = On. When data registration is enabled, 
the radio registers with the data system on a channel 
change.

3. Also on the Per System Conventional screen, set the 

OTAR Time Out Time. When rekeying is 
requested by the radio (OTAR Rekey option button 
pressed or menu selected), this setting determines 
how long the radio waits for a response from the 
KMF. Times of 20-180 seconds can be programmed, 
and the default is 30 seconds.

The 41xx portable does not support Motorola 

dynamic data registration. Therefore, each radio must 
be manually registered on the Motorola RNC Console 
by entering the following command:

Where, “xx xx xx” is the hex value of the Digital 

Unit ID entered by the PCConfigure software. Refer to 
the console documentation for the value of “yy” or use 
“00”. This registration needs to be done only once.

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-up sequence in which a tempo-
rary TEK is transferred to the radio to perform the key 
transfer.

1. 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.

2. RSI - This is normally initially the same as the P25 

Unit ID and is programmed by the PCConfigure 
software as described in Section 10.5.1. Therefore, 
the RSI should not need to be loaded if it is the first 
time the radio is being set up for OTAR or if the 
radio dumps keys due to long-term battery discon-
nect. However, it may need to be loaded if the radio 
is manually deleted from the KMF and then recre-
ated since the message number must be reset to 0 
(the Load Target RSI command resets the message 
number to 0).

3. KMF RSI - This RSI is normally 9,999,999 and 

should not need to be loaded since it defaults to this 
number. 

4. MNP (Message Number Period) - Load the proper 

message number period into the radio (typically 
1000). Refer to Section 10.4.6 for more information.

5. Verify that the above information was properly 

stored in the radio by viewing it using the keyloader.

10.6.1  SEM 4100/53XX, STANDARD 41XX

The OTAR capabilities of the SEM equipped 

4100 portable and 4300 mobile are as follows. 

•

Up to three keysets are used and it is assumed all 
three are always present.Keyset IDs 1 and 2 are for