我想知道是否可以通过 PSTN 网络发送数据。在通话过程中，我想通过电话线发送一些数据（因为可以发送 DTMF 音）。
我想要发送的数据是数字的，并且在模拟载波上进行加密和调制（以便可以通过模拟线路发送）。
我还看到我的宽带在通话时并行工作。
我猜 PSTN 在世界各地的工作方式都是一样的。
I wish to know whether it is possible to send data across PSTN network. While the call is in progress, I want to send some data through the telephone line (as DTMF tones can be sent).
The data that I want to send is digital and is encrypted and modulated on an analog carrier (so that it can be send over an analog wire).
I have also seen my broadband working in parallel when the call is going on.
I would guess PSTN work the same way throughout the world.
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您可以尝试找到支持 VoiceView 的旧调制解调器。 VoiceView 允许您在同一呼叫中在语音和数据之间切换，这是标准调制解调器协议不支持的功能。
You can try to find an old modem that supports VoiceView. VoiceView allowed you to switch between voice and data on the same call, a capability that the standard modem protocols did not support.
您只需使用老式调制解调器即可。它可以通过 PSTN 发送数据。不过，您也可以使用电缆的其余部分，但我认为需要 ATM 设备才能做到这一点。
You can just use an old fashioned modem.It can send data over the PSTN. However you can also use the rest of the bandwitch of the cable but will need ATM equipment to do this I would have thought.