Back in 2001 when we were wiring up ex-C&W for broadband, it was 2x1Gb to each *site*, let alone when you got to the backbone. Bigger sites had more 1Gb feeds - there was a set ratio per number of UBRs.
Backbone is 10Gb and IIRC 40Gb in places, on Juniper kit. Big iron, big bandwidth. ntl did build their backbone to last.
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I don't work for em, I used to contract for em but now work for the competition. But I am envious of their network...!!
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21CN? Isn't that, um, 'borrowed' from our design, I heard?