关键词: 包复用，包到达率，包长，缓存容量

Abstract: For the characteristics of CCSDS, which arc packet random arrival and variable packet length, the paper established the performance model and processing limit of multiplexing processing system that sends CCSDS packets. On the basis of packet arrival obeying Poisson process,thc relationship of cache capacity and processing speed with packet length was analyzed. Then overflow threshold of packet multiplexing processing system was educed. Simulation results show the impact of packet arrival rate and packet length on processing ability and the required cache capacity, whichprovides a theoretical basis for design of CCSDS sender data processing system.

Key words: Packet multiplexing, Packet arrival rate, Packet length, Cache capacity