A.T.& T. long-distance failure snarls air-traffic in New York

Article Abstract:

Nearly all of AT&T's long-distance telephone traffic was cut-off into and out of New York City Sep 17, 1991 due to a blown fuse in one of the company's switching stations. Effects of the failure were minimized since it occurred at 4:50 PM after the majority of businesses had closed for the day. However, the impact on air traffic was particularly severe because communications between airports and air traffic controllers were cut; the failure affected both arriving and departing flights from around the US. The US Federal Aviation Administration (FAA) reports that traffic controllers immediately delayed a number of flights to ensure passenger safety. AT&T has experienced three major network failures in New York City since 1989.

T, Telecommunications systems, Long distance telephone services, Air traffic control, Long-distance telephone service, American Telephone and Telegraph Co., Telecommunication switching equipment, Telecommunications switching equipment, Reliability (Trustworthiness), Reliability, Failure, System Crash

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Small company scrutinized in U.S. phone breakdowns

Article Abstract:

DSC Communications Corp's products are suspected of being responsible for recent breakdowns of telephone systems in Maryland, Virginia, West Virginia, Los Angeles, Pittsburgh, San Francisco, and Washington, DC. As many as 10 million customers may have been affected DSC Communications makes computer equipment for use with a complex communications technology known as Signaling System 7. Some industry analysts suggest that the problem is not with DSC's signal transfer point switches at all, but is a consequence of an overall design defect within Signaling System 7. According to these analysts, DSC might be taking the blame for a more complex problem.

Telephone and telegraph apparatus, Holding companies, not elsewhere classified, Switchgear and switchboard apparatus, Usage, Evaluation, Investigations, Telecommunications equipment industry, Bell Atlantic Corp., BEL, Sabotage, Pacific Telesis Group, PAC, Defects, Out-of-band signaling, Signaling System 7 (Computer network protocol), Investigation, DSC Communications Corp., DIGI

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• Abstracts: Global phone systems act to avoid failures. Superhuman failure: A.T.&T.'s trouble shows computers defy understanding even in collapse

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