Configuration using proAtoN
Page 27
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Channel 1 interval = 13500 slots (this equates to a 6 minute interval as there are 2250 slots per
minute)
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Channel 2 start UTC = 00:03 (the third frame of every hour)
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Channel 2 start slot = 0 (the first slot in the frame, so slots 0 and 1 are used by the message #21
transmission)
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Channel 2 interval = 13500 slots (this equates to a 6 minute interval as there are 2250 slots per
minute)
The transceiver is now configured to report message #21 on channel 1 every 6th minute, and on channel 2
every 6th minute, but offset by three minutes from channel 1. This results in a transmission of message #21
every three minutes on alternating channels. The actual start slot selected for each channel will depend on the
FATDMA allocations in the area of operation.
7.4.4
RATDMA Schedule configuration
Using the RATDMA (Random Access TDMA) access scheme the time for each transmission made by the
transceiver is specified. The transceiver will determine the actual slots used for transmission based on internal
knowledge of the AIS environment gained from the AIS receivers.
The parameters required for an RATDMA schedule are as follows.
Channel 1 start UTC
This is the hour and minute of the frame in which transmission will occur on channel 1. The slot used within this
frame will be determined by the transceiver.
Channel 1 interval
This is the interval in minutes between transmissions on channel 1. A typical value is 6 minutes.
Channel 2 start UTC
This is the hour and minute of the frame in which transmission will occur on channel 2. The slot used within this
frame will be determined by the transceiver.
Channel 2 interval
This is the interval in minutes between transmissions on channel 1. A typical value is 6 minutes.
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