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You are here: Home / Internet / Unrestricted Simplex Protocol

Unrestricted Simplex Protocol

October 20, 2008 By Keith Stromberg

It is the simplest though unrealistic protocol with the nick name “UTOPIA“. In this case data is transmitted in one direction only. Both the transmitting and receiving Network Layer are always ready and the proceeding time can be ignored. An infinite buffer space is available and also communication between a Data Link Layer never damages or looses frames.

The protocol consists of two distinct procedures, a sender and a receiver. The sender is in the Data Link Layer of the source machine and the receiver is in the Data Link Layer of the destination machine. No sequence numbers and acknowledgments are used, only event type of possible frame_arrival i.e. an arrival of an undamaged frame is bothered.

The sender is in an infinite while loop just sending data out on to the line as fast as it can. The body of the loop consist of three actions, go fetch a packet from the Network Layer, construct the outbound frame and send the frame on its way. Only the information field of the frame is used by this protocol, because the other fields have to do with error and flow control and these are no errors or flow control restrictions here.

The receiver is equally simple. Initially it waits for something to happen, the only possibility being a arrival of the undamaged frame. Eventually the frame arrives and the procedure waits_for_event receivers, with the event set to the frame_arrival. The call to from_Physical_Layer removes the hardware buffer. Finally the data portion is passed on to the Network Layer and the Data Link Layer setter back to wait for the second frame.

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