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Spektrum "serial" receivers?

I am a Spektrum (DX8G2) user about to embark on my first race quad build (Alien) and am looking at my receiver options. I have somewhat settled on the SPM4649T:


But wanted to clear up a terminology issue since I am still with much to learn. In information about this rec. and others,,,call it a one wire serial receiver. Is the term "serial" Spektrum's way of saying PPM/CPPM? Just curious. I understand the latter terms but do not understand what serial means.

Any help would be very appreciated. Thanks all in advance