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介绍了ADSL嵌入操作信道EOC的功能,说明了原有协议中EOC的局限性,并简要说明了 独立数据传送的概念以及在后续的ADSL协议版本中对EOC的功能扩展及改进措施.“,”This paper introduces the functions of embedded operations channel(EOC) in ADSL,and explains the limitations of EOC in the original protocol of ADSL,and concisely shows the concept Of ADT(automatic data transfer) as well as the expansion of the functions of and the measures for improving EOC mentioned in the subsequents of ADSL. Keywoads: ADSL; EOC; ADT