RATDMA

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RATDMA is a simple TDMA access scheme available for certain types of data transmission and AIS device types. RATDMA is defined in ITU-R M.1371-4 Annex 2, §3.3.4.2.

RATDMA is used when a station needs to allocate a slot, which has not been pre-announced. This is generally done for the first transmission slot during data link network entry, or for messages of a non-repeatable character (such as transmission of text messages).

The key elements of RATDMA operation are as follows:

The essential hardware requirements to support RATDMA are:

AtoNs using RATDMA behave like Class B transceivers, and transmit and receive data as follows: