SECURE COMMUNICATION (ENCRYPTION)
71
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 51xx portables and 53xx
mobiles that meet the following requirements support
OTAR:
Software Version Number - The 51xx must have
firmware (operating software) version number 1.5.0/
2.0/3/0 or higher, and the 53xx 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
Additional PCConfigure Programming 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).
The following describes programming with Version
1.25 or later.
1. On the Radio Wide Conventional screen, program
the Digital Unit ID.
2. On the Global screen, Page 2, set the Unit RSI ID as
desired (normally this ID is initially the same as the
Digital Unit ID). It can be changed later by the KMF
or keyloader if desired. Note these two IDs.
3. On the Per System Conventional screen, Page 2, for
OTAR and Data Settings, 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.
4. Also on this screen, set the other OTAR and Data
parameters. The OTAR Rekey Request Time Out
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. Refer to
the PCConfigure software manual and Help for
more information on these parameters.
Motorola RNC Registration (If Required)
The 51xx 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:
LCRD 03 06 00 1234 7F xx xx xx 0A 0A 00 07 00 yy
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.
Programming By Keyloader
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. Unit 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).
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