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5.4
Configuration using KPG-D1/ D1N
This section describes the configuration using KPG-D1/ D1N in order to use OTAR.
Configurations Related to P25 Data Communication
The following are functions related to CAI Packet Data communication and used as methods to transmit the KMM of OTAR.
Table 5-1 Configurations Related to P25 Data Communication
Function
Description
Number of Data Transmit Retries
The number of times that the Confirmed Packet Data is resent.
If the transceiver does not receive the Response Packet of successful receipt from
the other party after the transceiver transmits the Confirmed Packet Data, the
transceiver can retransmit the data for the number of times configured in
Number of
Data Transmit Retries
.
Maximum ACK Wait Time
The wait time for the Response Packet of successful receipt from the other party after
the transceiver transmits the CAI Packet Data.
After the transceiver transmits CAI Packet Data in the Confirmed Data Format, if the
transceiver does not receive the Response Packet from the other party while
Maximum ACK Wait Time
is counting down, the transceiver starts retransmission.
Frame Sync Seek Time
The time for the transceiver to detect the Frame Sync.
If Frame Sync is not detected while
Frame Sync Seek Time
is counting down, the
channel is determined as unused, and the transceiver transmits CAI Packet Data
which needs to be sent.
If the Frame Sync is detected,
Transmit Short Random Time
is activated.
Transmit Short Random Time
If the Frame Sync is first detected while
Frame Sync Seek Time
is counting down,
the random timer starts counting down from the time configured in
Transmit Short
Random Time
to 0. If Status Symbol is Idle after the timer expires, the transceiver
starts transmitting the CAI Packet Data.
Randomness is provided to prevent multiple transceivers from starting transmission
simultaneously with the same timing.
Transmit Long Random Time
If Status Symbol is Busy after the time configured in
Transmit Short Random
Time
elapses, or if a busy signal is received when the transceiver requests the start
to transmission, the random timer is activated for the time configured in
Transmit
Long Random Time
to 0. If Status Symbol is Idle after the timer expires, the
transceiver starts transmitting the CAI Packet Data.
If Status Symbol is Busy after the timer expires,
Transmit Short Random Time
is
randomly activated again. However, if the CAI Packet Data to be sent are Response
Packets,
Transmit ACK Random Time
is activated.
Randomness is provided to prevent multiple transceivers from starting transmission
simultaneously with the same timing.
Transmit ACK Random Time
When the CAI Packet Data to be sent are Response Packets, if Status Symbol is Busy
after the time configured in
Transmit Short Random Time
elapses, or if a busy signal
is received when the transceiver requests the start to transmission, the random timer
is activated for the time configured in
Transmit ACK Random Time
to 0. If Status
Symbol is Idle after the timer expires, the transceiver starts transmitting the CAI
Packet Data.
If Status Symbol is Busy after the timer expires,
Transmit ACK Random Time
is
activated again randomly. Randomness is provided to prevent multiple transceivers
from starting transmission simultaneously with the same timing.
5 P25 OTAR
5.4 Configuration using KPG-D1/ D1N
P25 FUNC (K)/Ver 2.20
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