A Layered Approach to Evaluating Processor and System Performance for VoP Applications

摘要

Voice over packet (VoP) at the customer premises is delivered in a variety of ways. An analog telephone adapter (ATA) allows a plain old telephone to be connected directly to an Internet connection. Internet protocol (IP) phones connect via an Ethernet cable or Wi-Fi interface to an Ethernet router. A personal computer can become a VoP portal by using a broadband Internet connection. An IP-based private branch exchange (PBX) allows a business to intemperate with the public switched telephone network (PSTN) by incorporating an IP gateway with PBX functionality. These systems use a combination of digital system processor (DSP), reduced instruction set computing (RISC), and complex instruction set computing (CISC) processors to share the processing load of a VoP system. VoP systems vary widely in their complexity but share many common components, thereby making it possible to develop a common set of benchmarks to allow engineers to analyze and appropriately design these systems. Using case studies, this paper presents a layered approach to evaluating processor and system performance that could be used for both ends of the VoP spectrum.