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A new kind of subscriber line testing system for SPC exchanges is introduced.
介绍一种新型的程控交换机用户线测试系统。
Very-high-speed digital subscriber line(VDSL) is the fastest access technology of the xDSL family.
甚高速数字用户线(VDSL)是数字用户线(DSL)家族中速率最高的接入方式。
Subscriber line interface circuit is an important part of digital program-controlled switching system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
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