Type Of Communications And Their Respective Features - AOR ARD9900 Instruction Manual

once will enable output of the video signal connected to the Video Input to be sent to the video
output port so that the video image can be checked before transmission. Pressing the TX
switch again will capture the image and then transmit it through your radio equipment. When
the Video Through Function is de-activated (AVT command is OFF), pressing the TX switch
will automatically capture the video image and then transmit it through the radio equipment. A
Progress indicator will display on the monitor during image transmission.
Types of communication and their respective features:
Encryption Method
•
The Master key and algorithm is used to create the encryption table therefore the Master
key and algorithm must be set to the same values for both the transmit and receive units.
•
The actual encryption code is selected from the encryption table by the Air Key.
In the Fixed Encryption mode (Flag : 00), the transmit data does not contain the Air Key. To
decode the received signal then, both parties must set the air key to the same value. Therefore
the Air Key must be obtained in advance, to select the encryption code and decode the
signals.
•
In the Random Encryption Mode 1, 2 (Flag : 40), the Air Key selected at the transmit end is sent
along with transmit data. At the receive end, the received data will be decoded by selecting
from the encryption table using the received Air Key, therefore matching Air Keys are not
required between parties.
•
In the Random Encryption Mode 3, 4 (Flag : 50), the random number coded Air Key is sent
along with transmit data. At the receive end, the received data will be decoded by selecting
from the encryption table using the received Air Key so again matching Air Keys are not
required.
•
Additionally, in the Random Encryption Mode 2, 4 (algorithm 80 – 99), the scramble function is
enabled and the encryption code will be changed in every 20 mSec. At the receive end, the
received data will be decoded by changing the encryption code in every 20 mSec. in
synchronisation with the original Air Key so again matching Air Keys are not required.