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本文介绍和说明 CCIR(82～86)研究期对构成综合业务数字网(ISDN)一部分的数字微段接力系统性能指标的规定。内容包括对原有建议和报告的改写与修订和本次会议新拟定的建议和报告。首先对 CCITT 关于 ISDN“最长假想参考连接”(LHRX)的规定和指标分配做一概括的介绍;然后再阐述三种不同质量等级的数字微段接力系统的性能指标。
This article describes and describes the requirements of the CCIR (82-86) study period for the performance specifications of digital microsest relay systems that form part of the Integrated Services Digital Network (ISDN). It includes the rewriting and revision of the original recommendations and reports and the newly developed recommendations and reports of the meeting. First, a brief introduction of CCITT’s stipulation and index distribution of ISDN longest hypothetical reference connection (LHRX) is given. Then, the performance indexes of digital microseismic relay system with three different quality levels are described.