这是发送和接收终端，让信息像差错或丢失的数据包。
It is the sending and receiving endpoints that keeps information about such things as errored or missing packets.
每个终端只需间歇地发送一个包含当前序列的空的数据包，确认信息和滑动窗口号就可以了。
Each end with nothing to say just periodically sends an empty data packet with its current sequence, acknowledgement and window Numbers.
华为IAD可以提供8 - 32路电话终端连接，将电话终端的信息转换成IP包，在NGN上实现软交换，并将计费信息通过RS232传给计费系统。
Huawei IAD (Integrated Access Device) provides 8-32 phone channels, transferring the information at phone terminals to IP packages to perform the soft switch and billing management system via RS232.
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