User's Manual

SECURE COMMUNICATION (ENCRYPTION)
69
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
Additional PCConfigure Programming 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.
Motorola RNC Registration (If Required)
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:
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. 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 RADIO OTAR CAPABILITIES
10.6.1 SEM 4100/53XX, STANDARD 41XX
The OTAR capabilities of the SEM equipped
4100 portable and 4300 mobile 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