STA5 subscriber line is applied to subscriber line interface of programmed control digital switches, and two wire analogy remote interface of access network.
STA5型用户板用于数字程控交换机的用户接口，也可做为各类接入网系统的远端二线模拟接口。
The article presents the concept, structure and interface evolution of the subscriber loop access network.
介绍了用户环路接入网的概念、结构及接口的演变等。
The article presents the concept, structure and interface evolution of the subscriber loop access network.
介绍了用户环路接入网的概念、结构及接口的演变等。
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