Quote: overloads of the telephone network caused almost half of the outage minutes; human error and acts of nature where other major causes

Quotation Skeleton

Major sources of failure [in the public switched telephone network] were human error … caused nearly half of all downtime (44 percent) … heavy reliance on software, was that software errors …   Google-1   Google-2

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Additional Titles

Quote: software errors caused less downtime of the telephone network, 2%, than any other source of failure except vandalism

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