The whole concept of serial vs parallel and analog vs digital is putting things in the context of electronics and how signals are generated, stored, and interpreted.

Addressing a major roadblock in next-generation photonic computing and signal processing systems, researchers at the Harvard ...

I have my digital inputs properly assigned, and the receiver is processing them as "digital"--it's just that the digital inputs won't pass a signal to the analog rec outs. Believe me, I tried.