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1 引 言 2001年11月11日中国入世的成功,标志着中国的电信业及其它行业引入竞争,也给中国的广电带来新的机遇和挑战。随着SDH、ATM、IP技术的迅猛发展,全国各地有线电视台HFC双向网改造的步伐相继加快,千兆以太网技术也广泛渗入到城域骨干网中,它以技术成熟、标准统一、灵活性强、价格低廉的优势,在行业中独占鳌头,是多数有线电视台的首选
1 Introduction The success of China’s accession to the WTO on November 11, 2001 marks the introduction of competition in the telecom industry and other industries in China. It also brings new opportunities and challenges to China’s broadcasting industry. With the rapid development of SDH, ATM and IP technologies, the pace of transformation of HFC bidirectional networks of cable television stations across the country has been accelerated one after another, and Gigabit Ethernet technology has also infiltrated the metropolitan backbone network extensively. With mature technologies, unified standards and flexibility Strong, low price advantage, champion in the industry, is the preferred choice for most cable stations