[SI-LIST] Analog or Digital

Hi! I had a question regarding analog signals
i.e.analog signals are signals whose amplitude varies
continuous with time.
Now, my question is can I calssify LVPECL, LVDS
signals as analog signals or as digital. I know what
to classify it as according to my understanding but I
needed some opinions on this.
Now, why do I ask this because some engineers are
trying to put lvpecl or lvds under analog and now try
to connect these chips to agnd which I diagree and say
it is much better to have a single gnd rather than
having separate gnd and then worry about connecting
them.
Thanks in advance
Bob
p.s I am might be wrong but at least I will be back on
the right path.

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