Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels
发布日期
1998-10-01
标准状态
现行有效;
摘要
This Recommendation gives functional characteristics of interfaces associated with:
?C network nodes, in particular, synchronous digital multiplex equipment and digital exchanges
in IDNs for telephony and ISDNs; and
?C PCM multiplexing equipment.
Clause 2 deals with basic frame structures, including details of frame length, frame alignment
signals, Cyclic Redundancy Check (CRC) procedures and other basic information.
Clauses 3 to 6 contain more specific information about how certain channels at 64 kbit/s and at other
bit rates are accommodated within the basic frame structures described in clause 2.
本建议给出了与下面设备相关的接口功能特性：
-网络节点，特别是电话用的IDNs 和ISDNs中的同步数字复用设备和数字交换设备，以及
-PCM复用设备。
第2节涉及到基本桢结构，包括桢长，桢定位信号，循环冗余校核程序和其他基础资料的详细说明。
第3节到第6节包括与在第2节所述的基本桢结构内如何提供某些64 kbit/s 和其它比特率的信道有关的更专门的资料
这些接口设备的电气特性在建议G.703中作了规定。
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发表于 2009-9-3 14:29:26
