Operating Manual

March 2008 5100 ES Models II/III Portable Radio Operating Manual 10-13
Secure Communication (Encryption)
MNP (Message Number Period) - Load the proper message number period into the
radio (typically 1000). Refer to Section 10.4.4 for more information.
Verify that the above information was properly stored in the radio by viewing it using the
keyloader.
10.5 Radio OTAR Capabilities
The OTAR capabilities of the SEM equipped 5100 ES portable 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 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.
• RSI (Radio Set Identifier)
- 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).
10.5.1 OTAR Messages That Are Supported
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