Network facsimile apparatus, facsimile communication system, and method that can efficiently transport packets
AssigneeRicoh Company, Ltd.
InventorTomohito Kajiwara
Life of this patent
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Abstract
A network facsimile apparatus conforms to ITU-T Recommendation T.38 Standard and includes a function of transporting packet data by using one of TCP and UDP. A packet delay detection part detects a delay in packet transmission. A UDP/TCP selection part transports a succeeding packet of an address by using UDP in a case where the delay in a preceding packet of the same address is equal to or greater than a predetermined value when transporting the packet data by using TCP, and transports a succeeding packet of an address by using TCP in a case where the delay in a preceding packet of the same address is less than the predetermined value when transporting the packet data by using UDP.
Claims10
A network facsimile apparatus configured to perform a facsimile communication by a Transmission Control Protocol (TCP) which executes a retransmission of facsimile data by waiting for a time-out at a transmitting end, or by a User Datagram Protocol (UDP) which adds an error correction data, said network facsimile apparatus comprising:
- a transmitting part configured to transmit a predetermined command;
- a receiving part configured to receive a response signal with respect to the predetermined command;
- a detecting part configured to detect a time difference from a time when the predetermined command is transmitted by the transmitting part to a time when the response signal is received by the receiving part;
- a comparing part configured to compare the time difference detected by the detecting part and a predetermined value and to obtain a comparison result;
- and
- a determining part configured to determine whether to perform the facsimile communication by the TCP or by the UDP, based on the comparison result obtained by the comparing part.
A facsimile communication method for performing a facsimile communication by a Transmission Control Protocol (TCP) which executed a retransmission of facsimile data by waiting for a time-out at a transmitting end, or by a User Datagram Protocol (UDP) which adds an error correction data, said facsimile communication method comprising:
- measuring a time difference from a time when a predetermined command is transmitted to a time when a response signal with respect to the predetermined command is received and
- determining whether to perform the facsimile communication by the TCP or by the UDP, based on a comparison result of the measured time difference and a predetermined value.
Dependencies are inferred from the claim text.