Patent ID: 7113490
Filing Date: 2006-09-26
Classification: H04N

Abstract:
1. A confirmation sequence in which progress of transmission of data from a data circuit-terminating equipment to a circuit is confirmed by a data terminal equipment, wherein the confirmation sequence is part of a communication sequence which performs transmission of data from the data terminal equipment to the circuit via the data circuit-terminating equipment by asynchronously executing transmission of the data from the data terminal equipment to the data circuit-terminating equipment and transmission of the data from the data circuit-terminating equipment to the circuit, wherein the confirmation sequence comprises; sending a first command, which indicates that the transmission of the data from the data circuit-terminating equipment to the circuit has not ended, from the data circuit-terminating equipment to the data terminal equipment if the transmission of the data from the data circuit-terminating equipment to the circuit has not ended at a predetermined time after transmission of the data from the data terminal equipment to the data circuit-terminating equipment has ended, sending a second command, for requesting confirmation of the progress of the transmission of the data from the data circuit-terminating equipment to the circuit, from the data terminal equipment to the data circuit-terminating equipment at an arbitrary timing after receipt by the data terminal equipment of the first command, upon receipt of the second command by the data circuit-terminating equipment, one of: (i) again sending of the first command from the data circuit-terminating equipment if the transmission of the data from the data circuit-terminating equipment to the circuit has not ended, and (ii) sending a third command, for indicating that the transmission of the data has ended, from the data circuit-terminating equipment to the data terminal equipment if the transmission of the data from the data circuit-terminating equipment to the circuit has ended, and ending the confirmation sequence by the data terminal equipment and the data circuit-terminating equipment after the third command is sent from the data circuit-terminating equipment and received by the data terminal equipment.