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相关的文章已经很多了,但在实践的过程中,存在着不少认识上的误区和一些实际问题,本文主要是结合自己在实践过程中得到的真实的体会和经验, 着重对双向HFC网络建设中经常碰到的一些概念认识和实际问题作一下探讨。我们已经习惯了用传统的思维模式(传输单向广播信号)来试图解决双向传输问题(传输通信信号)。有线电视信号是由“前端传输分配到用户末端”的模式,与“多种交互式业务信号传输”的模式在基本概念上有巨大差别。从上行传输的角度看,用户是“前端”。下行信号是分配传输的过程,上行信号是汇集传输的过程。而各级中心设备仅是信号交换枢纽站(立交桥和交警的概念)。我们只有从通信的基本原理和规律来思考,只有从根本上把立场改变了,才能开展正确的讨论,才有可能有正确的解决问题的方法和正确的规划方案。
There are many misunderstandings and some practical problems in the process of practice. This article is mainly based on the real experience and experience gained in practice, focusing on the construction of two-way HFC network In some of the often encountered conceptual understanding and practical issues to explore. We are used to trying to solve the bidirectional transmission problem (transmission of communication signals) in the traditional mode of thinking (transmission of unidirectional broadcast signals). Cable television signals are modeled as “front-end transmission assigned to the end of the user,” with a fundamental difference in concept from the “multiple interactive service signal transmission” model. From the perspective of uplink transmission, the user is “front-end.” The downlink signal is the process of distributing the transmission, and the uplink signal is a process of collecting and transmitting. The central equipment at all levels is only a signal exchange hub (overpass and traffic police concept). Only when we fundamentally change our stance so that we can conduct correct discussions can we have the correct solution to the problem and the correct planning proposal.