以下为句子列表：
英文: Integrated Services Digital Network (ISDN) - Switched network providing end-to-end digital connection for simultaneous transmission of voice and/or data over multiple multiplexed communication channels and employing transmission that conforms to internati
中文: 综合服务数字网络--是一种使用符合国际规定标准的开关网络，通过多路复合通讯频道，提供端至端的数字连接，实现声音或/和数据的同时传送。
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英文: The number of telephone lines connecting the subscriber's terminal equipment to the public switched network and which have a dedicated port in the telephone exchange equipment.
中文: 连接用户终端设备和公用交换网并具有一个电话交换设备专用端口的电话线数。
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英文: Use of packet-switched network can be charged according to the volume of data transferred and not to any notion of time spent online.
中文: 在使用分组交换网络时，可以按照传输的数据量（而非在线时间）收费。
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