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MCI INTRODUCES OPTICAL SWITCHING IN NETWORK

 WASHINGTON, July 1 /PRNewswire/ -- Continuing its lead in communications technology, MCI Communications Corporation (NASDAQ-NMS: MCIC) today announced that it has introduced optical switching in its network as another means of providing route protection and restoration capabilities.
 Developed by Porta Systems Corp., the Aster Optical Switch is operational in the Memphis, Tenn., area and MCI is the first company to install this Fiber Optic Route Protection System in a Telecommunications Network.
 "This new route protection system will allow MCI to continue to offer its customers the utmost in reliable service," said Lawrence J. Bouman, MCI's senior vice president of network engineering. "With the introduction of optical amplifiers, Dispersion Shifted Fiber and now optical switching in the network, MCI is once again pioneering new and innovative telecommunications technologies that place it at the leading- edge of the industry."
 When detecting a loss of optical laser light, the switch instantly re-directs the signal to an alternate MCI route in less than 20 milliseconds, nearly eliminating customer service interruptions. The system continuously monitors light levels on both the primary and back- up fiber routes.
 If optical power levels fall below selected thresholds, the optical switch changes position, re-routing traffic to the alternate fiber optic cable.
 The optical switch is bit rate and wavelength independent, meaning it is insensitive to signal bandwidth or content and will not become obsolete through the continuous upgrades that MCI performs on it network, including the change to SONET speeds.
 "We view this as a milestone in protection technology," states Lou Malolo, assistant vice president of sales at Porta Systems Corp. "This Fiber Route Protection (FRP) system, which incorporates less than 20 millisecond switching time, ensures the continuation of service with virtually no subsequent loss of revenue to MCI's subscriber lines."
 MCI Communications Corporation, headquartered in Washington, offers a full range of domestic and global telecommunications services through one of the world's largest state-of-the-art networks. The company, with 1992 revenue of more than $10 billion, is the second largest long distance provider in the U.S. and has more than 60 overseas offices in 55 countries.
 Porta Systems Corp., headquartered in Syosset, N.Y., offers fiber management, connection and protection systems for voice, video and data transmission.
 -0- 7/1/93
 /CONTACT: MCI Corporate News Bureau, 800-289-0073 or 202-887-3000/
 (MCIC)


CO: MCI; Porta Systems Corp. ST: District of Columbia, New York, Tennessee IN: TLS SU: PDT

IH-KD -- DC019 -- 7686 07/01/93 11:30 EDT
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Date:Jul 1, 1993
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