Patent ID: 6711167
Filing Date: 2004-03-23
Classification: H04L,H04Q

Abstract:
A method for controlling an ATM communication apparatus including an SAR module for executing the processing of a low level layer in an ATM communication network, and a high level processing unit distinct from said SAR module for executing the processing of a high level layer in said ATM communication network, for realizing the function of converting an ATM cell which is a unit of information transmission in said ATM communication network, into an IP packet adapted to a communication protocol of a computer network, and the function of converting the IP packet to ATM cells, the method comprising:by action only of said SAR module, holding data of a received ATM cell and data indicating the relation between VCI/VPI of said received ATM cell and a destination of said received ATM cell, transferring, when said received ATM cell comprises a heading cell of ATM cells forming said IP packet, data of said heading cell to said processing unit, reassembling said IP packet by using the held data of said received ATM cells, determining the destination of said IP Packet thus reassembled, on the basis of said data indicating the relation between said VCI/VPI of said received ATM cell and said destination of said received ATM cell, and by action only of said high level processing unit, causing said SAR module to hold said data indicating the relation between said VCI/VPI of said received ATM cell and said destination of said received ATM cell, from the data of said heading cell.