Posted by KWIL on 29/05/2017 18:52:43:
In the case of London city airport there are 3 separate feeds to Swanwick ATC centre and the cameras can zoom in as opposed to picking up a pair of binos., if a close up view is required.
Seen the case where two feeds, from two competing service providers (lets call them "A" and "B" ) , provide redundant network links.
Both "A" and "B" subcontract (or, one subcontracts to the other) such that both sets of traffic go down the same fibre optic cable.
And, of course, a JCB takes out one cable, and both networks.
This was in the ARPAnet days, but would expect it to be the case these days, too.
😐
Edited By John Alexander Stewart on 29/05/2017 23:41:01