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单线对高比特率数字用户线(SHDSL)支持利用现有铜线对进行上、下行速率对称的宽带数据接入(在相类似的技术中,其性能最佳)。综合接入设备(IAD)完成各种网络终端的统一接入,并将这些话音、数据等多种业务融合在一起,统一实现各自的功能。将这两项技术完美地结合,可为NGN提供一种全新地宽带接入方式。文章主要分析了基于SHDSL的IAD接入的网络结构、SHDSL功能模型、用户数据的映射和封装,以及基于SHDSL的IAD技术应用前景。
The single-pair high-bit-rate Digital Subscriber Line (SHDSL) supports the use of existing copper pairs for symmetric broadband data access at upstream and downstream speeds (with best performance in similar technologies). Integrated Access Device (IAD) to complete a unified access to a variety of network terminals, and these voice, data and other business integration together, unified realization of their respective functions. The perfect combination of these two technologies provides NGN with a new way of broadband access. This paper mainly analyzes the network structure of IAD access based on SHDSL, the SHDSL functional model, the mapping and encapsulation of user data, and the application prospect of IAD based on SHDSL.