本ETSI技术报告（ETR）涵盖了NT1网络侧数字传输系统的特性和参数，以构成综合业务数字网（ISDN）使用回声消除法基本速率接入的接入数字部分。它基于CCITT建议G.961[1]。系统应支持:-全双工；和-比特序列独立，传输CCITT R ecommendation I.412[2]中定义的两个B通道和一个D通道，以及访问的补充功能

This ETSI Technical Report (ETR) covers the characteristics and parame ters of a digital transmission system at the network side of the NT1 t o form part of the access digital section for the Integrated Services Digital Network (ISDN) basic rate access using echo cancellation metho d. It is based on CCITT Recommendation G.961 [1]. The system shall support: - full duplex; and - bit sequence independent, transmission of two B-channels and one D-channel as defined in CCITT R ecommendation I.412 [2] and the supplementary functions of the access