ABP (Alternating Bit Protocol) is a connection-less protocol for transferring messages in one direction between a pair of protocol entities. It is a simple form of the Sliding Window Protocol with a window size of 1. The message sequence numbers simply alternate between 0 and 1.
The following settings are adequate for a simple simulation. For a more advanced exploration, choose different options and click Change Settings. This will cause the simulation to restart.
Optionally set the level of control that the simulator user needs over the medium:
The protocol simulation shows a time-sequence diagram with transmitting and receiving protocol entities, and a communications medium that carries messages. The transmitter simply sends messages numbered DATA(0) or DATA(1); the content of messages is not identified. These are acknowledged with ACK(1) or ACK(0) respectively. Note that if a DATA message is received again due to re-transmission, it is acknowledged but discarded.
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