关键词: DOCSIS HFC 截断二进制指数回退算法 接入延时

Abstract:

The DOCSIS specification has become the de facto standard for the transparent bi-directional IP traffic transmission between the HFC network head and customer locations. In order to thoroughly study the influence of parameter configuration in the  DOCSIS specification on the system performance, by uti lizing OPNET, we firstly evaluate the influence of piggybacking, fragmentation and concatenation on the system performance, and then compare the influence of the different truncated binary exponential back-off windows setting on the system performance. Finally, on condition that the system load and the number of CMs are fixed, the relations among the MAP size, the number of contention slots, priority settings and access delay of the upstream channel are discussed, and the good performance parameters are gained. The article also provides an important reference value for the future complicated system si mulation.

Key words: DOCSIS, HFC, TBEB, access delay