At Cingular Wireless, a national mobile operator, network call traffic surged to 400 percent of its normal level from 10 a.m. to 11 a.m.

CNN: Networks hit, but telecom stays operational

Thus, some 310 Mbps of HD video were added to the normal traffic on a 622 Mbps (OC-12) network link.

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Traffic on the cellular network was running between 50 percent and 100 percent above normal levels, and its directory assistance and operator services were also overwhelmed, the company said in a statement.

CNN: Networks hit, but telecom stays operational