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

message number period into the radio (typically 
1000). Refer to Section 11.4.6 for more information.

5. Verify that the above information was properly 

stored in the radio by viewing it using the keyloader.

11.6.1  SEM 5100/5300, STANDARD 5100

The OTAR capabilities of the SEM equipped 

5100 portable and 5300 mobile and also standard 
(Version 1.x) 5100 are as follows. Refer to Section 9 
for more version information.

•

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. 

•

AES encryption is supported (with Flash code 1.8.0 
or later) but not currently available with OTAR 
(future availability is planned).

•

One individual RSI and it is usually initially the 
same as the P25 Unit ID.

•

One group RSI (usually initially “0”).

•

One KMF RSI (usually always 9,999,999).

The following KMM Message IDs are recognized 

by or sent:

CHANGE RSI

0x03

CHANGE RSI RESPONSE

0x04

KEYSET CHANGEOVER

0x05

KEYSET CHANGEOVER RESPONSE

0x06

DELAYED ACK

0x07

HELLO

0x0C

INVENTORY

0x0D

INVENTORY RESPONSE

0x0E

MODIFY KEY

0x13

MODIFY KEYSET ATTRIBUTES

0x14

MODIFY KEYSET ATTRIBUTES RESPONSE 0x15
NEGATIVE ACK

0x16

NO SERVICE

0x17

REKEY ACK

0x1D

REKEY

0x1E

WARM START

0x20

ZEROIZE

0x21

ZEROIZE RESPONSE

0x22

11.6.2  UCM EQUIPPED 5300

The 5300 UCM versions (see Section 9) use the 

Motorola UCM encryption module. Therefore, the 
OTAR capabilities are determined by that module. All 
capabilities of the Motorola KVL and KMF are 
supported. Initial radio programming by the PCCon-
figure software is the same as described in 
Section 11.5. 

11.6.3  OTAR OPTION SWITCHES

The following additional option switches can be 

programmed with the 5100 portable and 5300 mobile 
to control OTAR functions. They are also available as 
5100 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 5100 menu is used, the current active keyset 
is indicated by an asterisk. To change to the other 
keyset, highlight it and press the F2 key.

Clear/Secure Select - This enables and disables 
encryption regardless of whether OTAR is used. Refer 
to Section 11.3 for more information.

Erase Keys - Erases all TEK and KEK keys contained 
in the radio. With the 5100, this function is available 
as menu parameter only.

Key Select - This allows a different key to be selected 
for the current channel or group (conventional chan-
nels only). Refer to Section 11.2.5 for more 
information.