Dial up handshake spectrogram - photo

Dial up handshake spectrogram.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...g_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ds_meaning.jpg


Previously:

https://www.homemadetools.net/forum/...245#post188384
https://www.homemadetools.net/forum/...919#post210371
https://www.homemadetools.net/forum/...039#post157157
https://www.homemadetools.net/forum/...734#post212965

That's great. I had no idea that much information was exchanged during the initial handshake.