Research Of Key Technology On AAL2 Switch

The evolution of broadband multiservice ATM networks is generally expected to meet the necessary of multimedia services. To support variable-bit-rate delay-sensitive services (typically compressed voice) is very important. We argue that in order to support variable-bit-rate delay-sensitive traffic consisting of short packet, the standardization of a ATM adaptation layer, AAL2 and associated signaling protocol Q. 2630. 1 is necessary. The AAL2 protocol has been designed to support variable-bit-rate delay-sensitive services where other adaptation layers fail to deliver the required quality of service(QoS) and maintain efficient resource utilization at the same time. Q. 2630. 1 signaling protocol support the AAL2 switch on top of ATM layer. We focus on the research of AAL2 switch fabrics, which is the key and bottleneck of AAL2 network. After discussing the AAL2 switch fabrics, we draw a conclusion that the output buffering switch fabric is suitable for AAL2 switch with respect to some performances. Using VHDL hardware description language, we design the output buffering switch fabric and simulate the function.