There was a Verizon outage in Chicago today on 10/1/2010, which started about 10pm CST on Sept 30 and was fixed by 11:30am CST on 10/1/2010. They said it just affected a building at 2N Lasalle St.
Workers Repair Fiber Line
It affected digital lines that carry voice and data. The fiber line that was cut is a backbone line that Sprint, AT&T, Verizon or other services may run over.
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