PP Presentation
send DATAL(0)
(time out)
retransmit DATAL(0)
receive DATAR(0) ACK(0)
send DATAR(1) ACK(0)
receive DATAR(0) ACK(0)
(drop on floor)
receive DATAL(1) ACK(1)
send DATA(0) ACK(1)
receive DATAL(0)
send DATAR(0) ACK(0)
receive DATAL(0) (duplicate)
send DATAR(0) ACK(0)
(duplicate)
receive DATAL(1) ACK(0)
send DATAR(1) ACK(1)
receive DATAL(0)
send ACK(0)