A CRITICAL AT&T DATA NETWORK crashed on Apr. 13 and wiped out the ability of thousands of corporate customers to send and receive data. The "frame relay" network failed when two Cisco Systems switches, which direct data traffic, stopped sharing data accurately and outages spread throughout the country. By the next afternoon, AT&T had succeeded in restoring full service across the entire country. Still, CEO Michael Armstrong pledged not to charge any companies for any frame relay service until the company eliminated the chance that similar problems could occur in the future.

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