程控交换机用户板测试仪主要是针对中兴通讯ZXJ2000型程控交换机用户板而设计的。
The PBX user board trial instrument presented is designed mainly aiming at the ZXJ2000 PBX user board.
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。
STA5 subscriber line is applied to subscriber line interface of programmed control digital switches, and two wire analogy remote interface of access network.
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