North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Fiber cut?
On Mon, 21 Apr 2003, Steve Gibbard wrote: > This is NANOG, and this is pretty basic, so this is probably the wrong > forum for this explanation. That said, if a small ISP gets taken off line > by a fiber cut, it's far more likely to be somewhere between the major > backbone and the ISP (a circuit which from the ISP's perspective may be > controlled by the major backbone), than it is that the fiber cut will > actually isolate the major backbone's POP. The major backbones at this > point have a fair amount of redundancy built in, while the circuit from > the major backbone to the ISP is likely to be a single circuit on a single > path. > > Still, even in that environment, most circuit outages are not fiber cuts. There are no reliable public statistics concerning outage causes for IP networks. The FCC and NRIC have a focus group establishing a voluntary outage reporting process for Cable, IP and Wireless providers. See http://www.nric.org/ Last quarter 49% of all FCC reported outages were facility failures (cable cuts and similar outside plant problems). Other sources of outages were Signalling (21%), CO Power (12%), Local switch (12%) and Tandem switch (6%).
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