Icom IC-F9511T User Manual page 56

Key Fail Indication
The transceiver indicates "Key Fail" for the
specified time period* when the Common Key
Reference (CKR) of the selected channel is not
stored in the encryption unit.
Decryption Multi Keys function
When this function is enabled, the transceiver
releases the mute after receiving the audio signals l th t
for decryption, even if the CKR setting is not
matched to the selected channel.
*Depending on the pre-set time.
■ OTAR function
P25 Over The Air Rekeying (OTAR) function P25 Over-The-Air-Rekeying (OTAR) function
allows the Key Management Facility (KMF) to
change the encryption keys in a transceiver
remotely, ("over the air") to protect the secure
communications. Moreover, several OTAR
commands are used to perform the following
operations. See also
From KMF to transceiver:
• Change Active Keyset
• Change Group RSI
• Radio Check
- The transceiver automatically responds to any
command.
From transceiver to KMF:
• Registration to the OTAR system
• Deregistration from the OTAR system D i t ti f
• Rekeying
- When the channel in which the OTAR function is
enabled is selected, the transceiver automatically
attempts registration to the OTAR system by
transmitting a Key Management Message (KMM)
to KMF. Various other commands are exchanged
between KMF and a transceiver, other than above.
Registration to the OTAR system
➥ Push [Zone], then push [CH Up] or [CH Down],
or rotate [CH Up/Down], to select the channel
in which the OTAR function is enabled.
After selecting the channel, the transceiver
automatically attempts registration to the automatically attempts registration to the
OTAR system by transmitting a KMM
'Registration' command to KMF.
56
APCO P25 Mode Operation
ft i i th di
4-7 OTAR for this function.
th OTAR t
▒ NOTE: There are 2 models of KMM— Standard
▒ and Packet. If the pre-programmed KMM type
▒ is not matched to the system to which the
▒ transceiver attempts to register with, the
▒ registration attempt may fail. In that case,
▒ the transceiver's KMM type should be changed
▒ to another type.
i l
Deregistration from the OTAR system
➥ Push [CH Up] or [CH Down], or rotate
[CH Up/Down], to exit the channel in which the
OTAR function is enabled. After exiting the
channel, the transceiver automatically attempts
deregistration from the OTAR system by
transmitting a KMM 'Deregistration' command
to KMF.
Rekey request function
Normally, the encryption keys are managed and
securely changed by KMF over the air without
receiving a Rekey request. But the transceiver
can control KMF remotely by sending a Rekey
request to perform the rekey operation.
1Push and hold [Rekey] for 1 sec to send a KMM
'Hello' command to KMF for a Rekey request.
• "REQUEST REKE" appears.
2 After receiving a Rekey request from the
transceiver, KMF performs the rekey operation.
3 When the rekey operation is successful,
"REQUEST REKE" disappears.
• If the rekey operation fails, "FAILED" appears.
Active Keyset selection
This function allows you to select the Active Keyset
that is stored in the transceiver.
The keyset structures a group of keys. By changing
the keyset, the group of keys will be automatically y
switched to another group.
1Push [Keyset] to enter the keyset selection mode.
• The selected keyset name ("KEYSET1" or
"KEYSET2") appears.
2Push [CH Up] or [CH Down], or rotate
[CH Up/Down], to select the desired keyset.
3Push and hold [Keyset] for 1 sec to set the 3Push and hold [Keyset] for 1 sec to set the
selected keyset.
4Push [Keyset] to exit the keyset selection mode.
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