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Class Information
Number: 398/2
Name: Optical communications > Fault recovery > Bypass inoperative element
Description: Subject matter including a provision for alternate routing when the network or its component is at fault.


Sub-classes under this class:

Class Number Class Name Patents
398/3 In a ring or loop 108
398/5 Spare channel or standby optical fiber 230


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
6671463 Arrangement for transmitting, radiating and receiving high-frequency signals Dec. 30, 2003
6661972 Method and apparatus for transparent optical communication with two-fiber bidirectional ring with autoprotection and management of low priority traffic Dec. 9, 2003
6647174 Optical fiber transmission bypass device Nov. 11, 2003
6344914 Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier Feb. 5, 2002
6331905 Network switch failure restoration Dec. 18, 2001
6323974 Optical protection system for liquid crystal switches Nov. 27, 2001
6317230 Optical cross-connect system and optical transmission system Nov. 13, 2001
6307653 Optical matrix protection system Oct. 23, 2001
6304346 Fault restoration control method and it's apparatus in a communication network Oct. 16, 2001
6292281 Protection for MEMS cross-bar switch Sep. 18, 2001
6292464 Apparatus and method for self routing control mechanism for restoring fiber optic communications network connections Sep. 18, 2001
6288806 Optical subscriber network system and fault supervising method for optical subscriber network system Sep. 11, 2001
6278689 Optical cross-connect restoration technique Aug. 21, 2001
6233072 Method and system for restoring coincident line and facility failures May. 15, 2001
6178025 Optical network loss-of-signal detection Jan. 23, 2001
6034798 Optical network and arrangement and method in such network Mar. 7, 2000
5986783 Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks Nov. 16, 1999
5978120 Optical switch arrangement with synchronisation feature and in particular optical protection switching module and optical hitless protection switching module using such an arrangement and meth Nov. 2, 1999
5949563 Wavelength division multiplexing transmitter receiver, optical transmission system, and redundant system switching method Sep. 7, 1999
5912998 Optical network with repeater at a split-level of the network Jun. 15, 1999
5828475 Bypass switching and messaging mechanism for providing intermix data transfer for a fiber optic switch using a bypass bus and buffer Oct. 27, 1998
5764405 Lossless optical transmission system architecture with non-failing optical amplifiers Jun. 9, 1998
5555478 Fiber optic information transmission system Sep. 10, 1996
5539564 Point-to-multipoint optical transmission system Jul. 23, 1996
5490007 Bypass switching and messaging mechanism for providing intermix data transfer for a fiber optic switch Feb. 6, 1996
5469286 Optoelectronic installation for the interconnection of electronic modules and a corresponding optoelectric connector Nov. 21, 1995
5457555 Optical transmission system Oct. 10, 1995
5434691 Communications system having optical transmission line switching system Jul. 18, 1995
5327275 Switching system of optical transmission lines for protecting from trouble Jul. 5, 1994
5299293 Protection arrangement for an optical transmitter/receiver device Mar. 29, 1994
5278688 Fault tolerant fiber optic transmission system Jan. 11, 1994
5218465 Intelligent interconnects for broadband optical networking Jun. 8, 1993
5091796 Optical communication system having an improved protection line switching mechanism Feb. 25, 1992
5086348 System for connecting optical lines to a wideband telecommunications exchange Feb. 4, 1992
4704713 Optical ring network Nov. 3, 1987
4696001 Reconfigurable high-speed integrated local network Sep. 22, 1987
4561120 Protective relaying system Dec. 24, 1985
4112293 Optical fiber data transmission system Sep. 5, 1978

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