Think this through starting at the first OSI layer. If the line is down
(physical) layer, then how could the next higher layer--which depends on
lower layers--ever possibly hope to function?
It can't. You can't have a functional datalink layer without first having
valid physical connectivity.
> Hi Gang,
> Just been looking at the binary possibilities of
> these options i.e 0 0
> 0 1
> 1 0
> 1 1
>
> And feel thet that Line Down, Protocol Up is
> impossible.
> Can anyone confirm this or has anyone seen anything
> quirky of this nature.
>
> Regards,
>
> Phil.
>
>
>
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