如同在Wikipedia中所定义的，Internet是世界范围内、可公开访问的一系列互相连通的计算机网络，这些网络通过使用标准Internet协议(ip)的分组交换传输数据。
As defined in Wikipedia, the Internet is a worldwide, publicly accessible series of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP).
专用综合服务网络交换（PINX）是在BRI语音应用中使用QSIG信令的专用分组交换机或主系统。
Private INtegrated services network eXchange(PINX) is a PBX or key system which, in a BRI voice application, uses QSIG signaling.
分组交换也有缺点，需要花一些时间将数据“通话”拆分为多个分组，使用不同通道传输这些分组，然后在接收端将分组重新组装。
Packet switching does have the problem that it takes a little time to break up the data "conversations" into many packets, send them on their different ways and then reassemble them at the other end.
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