Method of establishing connection

A connection establishing method of establishing a connection in accordance to a communication protocol without acknowledge signal from receiver to transmitter for transmitted protocol data by transmitting and receiving protocol data between two apparatuses, to prevent a timer count from being started due to a detection of error if variables are not coincident in Signalling ATM Adaptation Layer (SAAL) said method comprising the steps of:

• making a judgment as to a restart after losing communication status and initializing a variable possessed by said transmitting side apparatus into a predetermined value according to said communication protocol;
• transmitting the protocol data purporting the restart;
• and
• receiving the protocol data and initializing a variable possessed by said receiving side apparatus into said predetermined value according to said communication protocol.

A connection establishing apparatus for establishing a connection in accordance to a communication protocol without acknowledge signal from receiver to transmitter for transmitted protocol data by transmitting and receiving protocol data between two apparatuses to prevent a timer count from being started due to a detection of error if variables are not coincident in Signalling ATM Adaptation Layer (SAAL) comprising:

• judgment means for making judgment as to a restart after losing communication status and initializing a variable possessed by said transmitting side apparatus into a predetermined value according to said communication protocol;
• storing means for storing the protocol data with information indicating the restart and transmitting the protocol data;
• and
• receiving means for receiving the protocol data and initializing a variable possessed by said receiving side apparatus, on the basis of the restart information, into said predermined value according to said communication protocol.

A connection establishing method of establishing a connection by transmitting and receiving protocol data between two apparatuses according to a communication protocol without an acknowledge signal from receiver to transmitter for transmitted protocol data, to prevent a timer count from being started due to a detection of error if variables are not coincident in Signalling ATM Adaptation Layer (SAAL) said method comprising the steps:

• making a judgment as to a restart within said transmitting side apparatus and initializing a variable possessed by said transmitting side apparatus into a predetermined value according to said communication protocol;
• storing the protocol data with information indicating the restart and transmitting the protocol data;
• and
• receiving the protocol data and initializing a variable possessed by said receiving side apparatus, on the basis of the restart information, into said predetermined value according to said communication protocol.