Is that considered true by most leased dark fiber providers? If I'm leasing a dark fiber circuit from a provider, I generally expect that what I'm leasing is in fact one [or more] physical strands of fiber - not a somehow redundant connection. Since he mentioned that this would be a dark fiber network, I would tend to assume that's the product that he'd be offering. Indeed, this has also been my experience with other providers, including very large and relatively smaller ones - when leasing dark fiber, or subscribing to a DWDM-based service, I'm going to be tied to a single, specific path and physical disruptions to said path will impact my connectivity. That's always been my expectation and experience at least - am I wrong, or has this changed at some point? 

- Matt