Importance

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Abstract

A protocol processing portion performs SSCOP processing while referring to protocol parameters stored in a parameter managing portion. The parameter managing portion includes a parameter changing portion and a parameter table. The protocol parameters required in performing the SSCOP processing in the protocol processing portion are stored in the parameter table. The parameter changing portion changes the value of a prescribed protocol parameter (MaxPD) in the parameter table depending on the number of data packets whose transfer is required at one time by a data transfer application. A connection setting portion sets a logical channel between the data transfer device and a data transfer device which is a destination of communication through an ATM network, to allow data transfer. The data transfer application sets a logical channel between the data transfer device and a device which is a destination of data transfer upon instructing the connection setting portion, then assembles data to be transferred into packets, and requires transmission of the packet data of the protocol processing portion. A communication control portion sends out to the ATM network control data for setting the logical channel given by the connection setting portion, or the packet data given by the protocol processing portion. Such construction makes it possible to send out a delivery confirmation packet (POLL) immediately after the data packets continuously sent out, and quickly confirm the delivery of the data.

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First Claim