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programming can be overridden on the channel 
screen (see Section 11.3.3). Additional PIDs for 
special calls can also be specified on the system 
screen for digital and trunked calls. NOTE: The 
encryption type is not selectable on digital chan-
nels because the AES/DES mode is determined 
by the key type loaded, not by PCConfigure 
programming.

Currently, EFJohnson 5100 portables and 5300 

mobiles that meet the following requirements support 
OTAR:

Software Version Number - The 5100 must have 
firmware (operating software) version number 1.5.0/
2.0/3/0 or higher, and the 5300 must have firmware 
2.0/3.0 or higher or ARM code 1.16.0 or higher and 
DSP code 1.32.0 or higher. The software version 
number is briefly displayed when power is turned on. 
It can also be determined using the PCConfigure 
programming software by selecting the Transfer > 
Read Version Info from Radio menu parameter.

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

11.5.2  ADDITIONAL SETUP FOR OTAR

The following parameters must be programmed 

for OTAR operation in addition to those in Section 
11.5.1 (PCConfigure Version 1.17 or later is required). 

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 5100/5300 may not support Motorola 

dynamic data registration. Therefore, each radio may 
need to 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 11.5.1. 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.