Scot L. Harris wrote:
On Tue, 2004-02-10 at 18:04, Henry Tang wrote:
Sounds like it DS1s today are not as reliable. I know our main store has a fall back circuit and our providers monitors our DS1, but i wonder if my DS1 backup will do any good if it the problem wasn't cabling problem. So if the provider is dead, even a backup from them will not work, unless they use a differet carrier.
henry
Ah! The "I have redundant circuits to different providers, so why did that guy with a backhoe take all of them out with one swipe?"
Redundancy can be very difficult. If you have full redundancy you will have multiple circuits coming into the building at different points. Unfortunately most buildings have a single demark and all your cables will run in the same trench. One backhoe and everything goes dead.
Again, it will come down to an analysis of costs due to loss connectivity verses costs to provide redundancy. As well as identifying the most likely points of failures.
In another note, I mentioned where there were redunant paths. It was for a major bank and they not only had dual routes from my company, but also from the phone company. These circuits were used to link redundant computer centres. It would take some doing, to knock them off, with two sites and four independant routes between them.