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Public Switch Telephone Network is one of mature networks.
公共交换电话网是成熟的网络之一。
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At the telephone company end, ISDN lines connect to a digital switch.
在电话局一端，ISDN线连到数字交换机。
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At the telephone company end, ISDN lines connect to a digital switch.
在电话局一端，ISDN线连到数字交换机。
youdao