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2007年起，局用交换机容量包含接入网设备容量。
Data on capacity of office switching machine include network Equipment since 2007.
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在电话局一端，ISDN线连到数字交换机。
At the telephone company end, ISDN lines connect to a digital switch.
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在电话局一端，ISDN线连到数字交换机。
At the telephone company end, ISDN lines connect to a digital switch.
youdao