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ＡＸＤ４／１是爱立逊公司的传输网中新近投入使用的数字交叉连接系统（ＤＸＣ－ＤｉｇｉｔａｌＣｒｏｓｓＣｏｎｎｅｃｔ），是为满足同步数字系列（ＳＤＨ－ＳｙｎｃｈｒｏｎｏｕｓＤｉｇｉｔａｌＨｉｅｒａｒｃｈｙ）和准同步数字系列（ＰＤＨ－ＰｉｅｓｉｏｃｈｒｏｎｏｕｓＤｉｇｉｔａｌＨｉｅｒａｒｃｈｙ）传输网的多种需要而设计的。本文介绍ＡＸＤ４／１系统的结构与组成。
The AXD4 / 1 is the newly introduced Digital Cross Connect (DXC-Digital Cross Connect) in the transmission network of Elson. It is designed to meet the requirements of the SDH-Synchronous Digital Hierarchy and PDH-Piesiochronous Digital Hierarchy Transport Networks A variety of needs and design. This article describes the structure and composition of the AXD4 / 1 system.