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A window of size 1 is maintained by both sender and receiver.
For the sender, it is or 1.
For the receiver, it is or 1.
if a new frame is to be transmitted, the sender stamps it
with , sends it and sets
If the sender timed out before receiving ACK, which
could be due to excessive delay, lost ACK or lost
frame in the forward direction, the same frame is resent;
The protocol can be implemented on a simplex channel since
at any time transmission in only one direction is required.
The main problem with this protocol is low efficiency when
the delay is long (or equivalently, when the frame is short, or when the transmission
rate is high).