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读者乍一看到文章的题目,一定以为本文将讨论商业POS(Point of Sales)系统。其实,此POS,并非彼POS。这里主要介绍的是,当今世界上最新的网络技术之一——POS(Packet over SDH)技术,它是运用光纤作为传输介质,替代传统的电缆或同轴电缆来传递同步数字信号的技术。它在带宽、可扩展,互连性和有效性方面能够真正满足了用户的要求。文章对上述方面作了详细、认真的评述,并与异步传输方式ATM进行比较,给读者对POS技术一个较为完整的认识,为今后应用打下了一定的基础。
At first glance readers of the article title, we must think that this article will discuss the commercial POS (Point of Sales) system. In fact, this POS, not he is POS. The main introduction here is one of the latest network technologies in the world - Packet over SDH (PDOS) technology. It is a technology that uses optical fiber as a transmission medium to replace the traditional cable or coaxial cable to transmit synchronous digital signals. It truly meets the user’s requirements in terms of bandwidth, scalability, connectivity and availability. The article made a detailed and serious comment on the above aspects and compared it with Asynchronous Transfer Mode (ATM), giving readers a more complete understanding of POS technology and laying a solid foundation for future application.