Data transmitting apparatus, data receiving apparatus and data transmission control apparatus

A data transmitting apparatus, wherein

• said data transmitting apparatus is a transmitting apparatus acquiring a part of the bandwidth of a transmitting medium before transmission and transmit it and comprising:
• bandwidth detection means for detecting a bandwidth of data inputted to said transmitting apparatus;
• necessary bandwidth calculation means for calculating a necessary bandwidth for said transmitting medium from said bandwidth detected at said bandwidth detection means;
• transmission condition judge means for comparing a acquired bandwidth acquired from said transmitting medium with said necessary bandwidth outputted from said necessary bandwidth calculation means and judging if said necessary bandwidth exceeds said acquired bandwidth;
• transmission control means for outputting said data only while the judge result outputted from said transmission condition judge means indicates that said necessary bandwidth does not exceed said acquired bandwidth;
• bandwidth information adding means for adding said bandwidth outputted from said bandwidth detection means to said data outputted from said transmission control means and outputting only said bandwidth information while said data is not being inputted from said transmission control means;
• and
• transmission means for sending said data outputted from said bandwidth information adding means and added with said bandwidth information or said bandwidth information to said transmitting medium.

A data receiving apparatus comprising:

• reception means for receiving said data sent from a transmitting apparatus acquiring a part of the bandwidth of a transmitting medium before communication and transmitting only while the bandwidth of data to be transmitted does not exceed the acquired bandwidth to said transmitting medium;
• transmission stop detection means for inputting said data received at said reception means and detecting that said transmitting apparatus stops transmission by detecting that said data does not arrive for a designated period;
• and
• processing means for processing to correspond according to the detection result detected at said transmission stop detection means.

A data receiving apparatus comprising:

• reception means for receiving said data sent from a transmitting apparatus acquiring a part of the bandwidth of a transmitting medium before transmission, transmitting said data added with bandwidth information while the bandwidth of data to be transmitted does not exceed the acquired bandwidth and transmitting only said bandwidth information when said data bandwidth exceeds the acquired bandwidth to said transmitting medium and added with said bandwidth information, from said transmitting medium;
• transmission stop detection means for inputting said data received at said reception means and detecting that said transmitting apparatus stops transmission of said data by detecting that said data does not arrive for a designated period;
• bandwidth information separation means for inputting said data received at said reception means and added with said bandwidth information and separating and outputting said bandwidth information added from said data;
• and
• processing means for processing to correspond according to the detection result detected at said transmission stop detection means and at least one of said bandwidth information separated at said bandwidth information separation means.

A data transmitting apparatus, wherein

• said data transmitting apparatus is a data transmitting apparatus connected to a transmitting medium in which a propagation delay depending on a connection topology of an apparatus connected to the transmitting medium occurs and which acquires a part of bandwidth of said transmitting medium before transmission and transmits it and comprising:
• propagation delay identifier holding means for holding a propagation delay identifier determined by a connection topology of an apparatus connected to said transmitting medium and expressing propagation delay size of said transmitting medium;
• and
• maximum transmission data size holding means for holding maximum transmission data size expressing maximum size of the data which can be contained in a packet transmitted to said transmitting medium;
• and wherein
• said propagation delay identifier holding means can read and write said propagation delay identifier through said communication;
• and
• said maximum transmission data size holding means can read said maximum transmission data size through said transmitting medium.

A data transmission control apparatus, wherein

• said data transmission control apparatus is a control apparatus for a transmitting apparatus connected to a transmitting medium in which a propagation delay depending on a connection topology, of an apparatus connected to the transmitting medium and having propagation delay identifier holding means for holding a propagation delay identifier which is determined by a connection topology of an apparatus connected to the transmitting medium and expresses propagation delay size of said transmitting medium, and comprising:
• analyzing means for analyzing a connection topology of an apparatus connected to said transmitting medium;
• identifier determination means for determining said propagation delay identifier according to the analyzing result outputted from said analyzing means;
• and
• identifier setting means for setting said propagation delay identifier determined at said identifier determination means in said propagation delay identifier holding means.

A data transmitting apparatus comprising:

• measurement means for measuring a data size arrives in a designated fixed period;
• bandwidth determination means for determining a transmission bandwidth from the data size measured at said measurement means;
• and
• transmission means for transmitting according to the transmission bandwidth determined at said bandwidth determination means.

A data transmitting apparatus comprising:

• judge means for judging if the transmission packets which a receiving apparatus receives from a transmission medium passes the timing to be outputted from said receiving apparatus;
• a counter for counting up the value when a transmitting apparatus sends one of said transmission packets and counting down the value when said judge means judges that each of said transmission packets passes the timing to be outputted from said receiving apparatus;
• determination means for determining a transmission timing of each of said transmission packets so that said counted value does not exceed a faxed value;
• and
• transmission means for transmitting said data according to the transmission timing determined at said determination means.

A data transmitting apparatus comprising:

• calculation means for calculating delay time from the buffer size provided with in the receiving apparatus and the data rate of the data inputted to said receiving apparatus;
• judge means for comparing said delay time with a designated value and judging;
• transmission time stamp adding means for adding the input time to said receiving apparatus and the output of said judge means to each of said transmission packets as a transmission time stamp which is information of the timing which said receiving apparatus has to output said packet;
• and
• transmission means for transmitting the packet added with said transmission time stamp;
• at a transmitting apparatus transmitting the data inputted by a packet unit.