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7035539 |
Interconnecting nodes in an optical communication system
A sub-network of a communication network includes four nodes, with each node having two input ports and two output ports. The first node and the fourth node each link both of their input ports and...
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6898376 |
Optical ring protection apparatus and methods
An optical communication system comprising plural optical communication paths, a passive optical coupler, and at least one optical node. The passive optical coupler has a plurality of inputs...
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6757493 |
Communication link with non-intrusive expansion capability
Systems and methods are described for communications links with non-intrusive expansion capability. A first splitter combiner switches form a shut state to a bypass state when a second headend...
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6618522 |
Active equipment protection methods and apparatus
Systems and methods are described for communications networks. A method, includes deploying a communication link, at least a portion of which is protected against active equipment failure, that...
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5889478 |
Fault tolerant apparatus for detecting the passage of a moving body
On the moving body, the apparatus comprises an active transponder, and on the track it comprises a passive responder. The transponder has an LF transmitter and an MF transmitter which, during...
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5713017 |
Dual counter consistency control for fault tolerant network file servers
A consistency control method for a fault tolerant file system. Data files in this fault tolerant file system are replicated on file system servers. The update request will be sent to all the file...
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5629789 |
Passive optical repeater bypass for optical fiber systems
A passive fiber optic repeater bypass is provided which brings fault tolerance to repeatered fiber optic transmission systems. A fiber optic bypass provides an alternate signal path around failed...
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5331642 |
Management of FDDI physical link errors
An LAN management facility for monitoring and managing errors on the physical links connecting the stations of a LAN. The facility includes, in part, an Enhanced Link Error Monitor (LEM). The...
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5282257 |
Star coupler and optical communication network
An optical coupler capable of reducing the number of terminals of a star coupler per node and allowing easy expansion of a network configured by star couplers. A star coupler of the invention has a...
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