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- Sprint's Self-Healing Fiber-Optic
- Technology 11/16/94 CHICAGO,
- ILLINOIS, U.S.A., 1994 NOV 16 (NB) --
- Sprint (NYSE: FON) executives took an
- ax to one of the firm's fiber-optic
- cables this week, to show off what
- the firm billed as "a new standard of
- telecommunications survivability."
- That mouthful actually means lost
- connections can be reestablished
- immediately, instead of in minutes or
- hours, when a cable gets cut or an
- equipment failure.
-
- The demonstration took place in
- Chicago, where the technology is in
- place, and worked as advertised. A
- video signal displayed on a TV
- monitor showed only a brief flicker
- when the cable was severed.
-
- Sprint spokesperson Jim Bowman
- told Newsbytes, "We told people,
- don't watch the ax, watch the
- monitor. When the ax came down, three
- little horizontal lines crossed the
- picture. If you blinked, you missed
- it."
-
- He added that, though Sprint only
- claims a system will self-heal in 60
- milliseconds, an oscilloscope
- measuring the event showed the signal
- was fully restored in only 8
- milliseconds.
-
- "I don't think 'amaze' is too big
- a word," commented Bowman. "We had
- some senior people from NEC there,
- and one of them pointed out to me
- afterward that we had repaired the
- network in a shorter time than it
- takes the Sprint pin to drop."
-
- Sprint has long used the image of
- a dropping pin on its TV ads, to
- suggest the quietness and fidelity of
- a fiber-optic connection.
-
- Bowman said Sprint's entire
- system will use the new "self-
- healing" technology by mid-1996. The
- result, says the communications firm,
- will be "unprecedented reliability
- for voice, video and data
- communications."
-
- The technology is based on SONET,
- for "synchronous optical network," a
- technology which Sprint began
- installing on its backbone network
- late last year. SONET improves
- transport capacity, while the firm's
- four-fiber, bidirectional, line-
- switched ring architecture allows the
- rapid self-healing, the firm says.
-
- Sprint says the self-healing
- following an interruption will go
- unnoticed on voice calls. Video
- transmissions will experience a very
- brief flicker without loss of picture
- and data transmissions, said the
- firm.
-
- To accomplish continuous service
- when a signal is lost, traffic is
- rerouted through the SONET ring. The
- Chicago installation is the first of
- 39 SONET rings Sprint plans to bring
- on-line in the US.
-
- Sprint claims other networks
- cannot self-heal nearly as quickly,
- because they use a linear
- architecture, rather than the ring
- architecture used by Sprint. If
- traffic between point A and point B
- is disrupted on a linear system,
- service must be suspended until
- network managers reroute the traffic
- or the cable is physically repaired.
- Either approach can take hours, says
- Sprint.
-
- Kevin Brauer, president of
- Sprint's business services group,
- said Sprint created the self-healing
- technology for customers running
- broadband, mission-critical
- applications over distributed
- systems, but Bowman added: "This will
- not be a premium service. It'll just
- be what you get when you get Sprint
- service."
-
- (Craig Menefee/19941116/Press
- Contact: Jim Bowman, 913-967-3675, or
- Norman Black, 404-859-6096, both of
- Sprint)
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