What type of transmission protocol do AIS Class B units utilize?

What type of transmission protocol do AIS Class B units utilize?

• A. Time Division Multiple Access
• B. Carrier Sense Time Division Multiple Access
• C. Self Organized Time Division Multiple Access
• D. Carrier-Sense Multiple Access

Answer: (C)

AIS Class B units use Self Organized Time Division Multiple Access (SOTDMA) as their transmission protocol. This method allows multiple vessels to communicate effectively by sharing the same frequency without causing interference with one another. In SOTDMA, each Class B unit independently determines when to transmit based on the availability of time slots, which are organized in a time division manner. The self-organizing aspect enables these units to manage their transmission timing, reducing the chances of collisions during data transmission and allowing for more efficient use of the channel. This protocol is particularly suited for the maritime environment, as it helps to optimize communication in a congested radio frequency spectrum, enabling all vessels equipped with AIS systems to continuously share their position and other essential navigational data. In contrast, the other protocols do not specifically incorporate the self-organizing feature, which is essential for AIS Class B functionality.

AIS Class B units use Self Organized Time Division Multiple Access (SOTDMA) as their transmission protocol. This method allows multiple vessels to communicate effectively by sharing the same frequency without causing interference with one another.

In SOTDMA, each Class B unit independently determines when to transmit based on the availability of time slots, which are organized in a time division manner. The self-organizing aspect enables these units to manage their transmission timing, reducing the chances of collisions during data transmission and allowing for more efficient use of the channel.

This protocol is particularly suited for the maritime environment, as it helps to optimize communication in a congested radio frequency spectrum, enabling all vessels equipped with AIS systems to continuously share their position and other essential navigational data. In contrast, the other protocols do not specifically incorporate the self-organizing feature, which is essential for AIS Class B functionality.