# US 6,977,889 B1 · Cross-connect method and cross-connect apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,977,889 B1 - Document ID: US6977889B1 - Status: Granted - Kind: B1 - Application number: 09/387,949 - Filed: 1999-09-01 - Granted: 2005-12-20 - Earliest claimed: 1998-12-24 - Assignees: Fujitsu Limited - Inventors: Mitsuhiro Kawaguchi; Shigeo Tani - Web page: https://patentgrep.com/patent/US6977889B1 ## CPC - H04Q 11/04: for time-division multiplexing {(H04Q11/0001 takes precedence)} - H04L 49/101: using crossbar or matrix - H04L 49/552: by ensuring the integrity of packets received through redundant connections - H04L 49/25: Routing or path finding in a switch fabric - H04L 49/254: {Centralised controller, i.e. arbitration or scheduling} - H04L 49/557: {Error correction, e.g. fault recovery or fault tolerance} - H04Q 2213/13076: Distributing frame, MDF, cross-connect switch - H04Q 2213/13167: Redundant apparatus - H04Q 2213/13292: Time division multiplexing, TDM - H04Q 2213/13393: Time slot switching, T-stage, time slot interchanging, TSI - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract There is described a cross-connect apparatus which can apply a cross-connect operation in place of a function of a hard switch that has conventionally been used for a purpose other than a cross-connect operation, by selection of line setting information used for path switching and service selection operations, and by performing a cross-connect operation based on the information, thereby preventing redundant configuration of the cross-connect apparatus and diminishing power consumption. ## Claims ### Claim 1 A cross-connect method for performing a cross-connect operation on a main signal including a working channel signal transmitted over a working path and a protection channel signal transmitted over a protection path, said method comprising the steps of: retaining line setting information required for the cross-connect operation; detecting trigger information, causing a selection of one of the working path and the protection path, for an individual channel signal from said main signal; cross-connecting trigger information pieces detected for the individual channel signal according to said retained line setting information; and controlling the cross-connect operation on the main signal based on said retained line setting information and the cross-connected trigger information pieces so that one of the working channel signal and the protection channel signal is selectively output under the cross-connect operation for the main signal, whereby said cross connect operation is shared for cross-connecting based on retained line setting information and selective outputting of either said working channel signal or said protection channel signal. ### Claim 2 A cross-connect apparatus comprising: a main signal cross-connect section for performing a cross-connect operation on a main signal including a working channel signal transmitted over a working path and a protection channel signal transmitted over a protection path; a memory section for retaining line setting information required for the cross-connect operation; a trigger information detecting section for detecting trigger information, causing a selection of one of the working path and the protection path, for an individual channel signal from said main signal; a trigger information cross-connect section for cross-connecting trigger information pieces detected by said trigger information detecting section for the individual channel signal according to the line setting information; and a cross-connect control section for controlling the cross-connect operation of the main signal cross-connect section, based on said retained line setting information of the memory section and the trigger information cross-connected by the trigger information cross-connect section so that one of the working channel signal and the protection channel signal is selectively output under the cross-connect operation of the main signal cross-connect section, wherein said cross connect operation is shared for cross-connecting based on retained line setting information and selective outputting of either said working channel signal or said protection signal. ### Claim 3 (depends on 2) A cross-connect apparatus according to claim 2, wherein said trigger information detecting section includes: an alarm detection section for detecting alarm information as the trigger information for the individual channel signal in the main signal; and an alarm information cross-connect section for cross-connecting alarm information pieces, detected by said alarm detection section, based on said line setting information retained in said memory section; and said cross-connect control section includes: a switch control section for generating selection information for selectively outputting the working signal or the protection signal under the main signal cross-connect operation, based on the line setting information and the cross-connected alarm information by said alarm information cross-connect section for outputting said selection information, said cross-connect operation for the main signal being operable to perform the main signal cross-connect operation based on said selection information output from said switch control section, wherein said cross connect operation is shared for said cross-connecting based on retained line setting information and selective outputting of either said working channel or said proton channel signal. ### Claim 4 (depends on 3) A cross-connect apparatus according to claim 3, wherein said alarm detection section encodes said detected alarm information in accordance with a predetermined priority, and said switch control section generates said selection information based on said encoded alarm information. ### Claim 5 A cross-connect apparatus comprising: a main signal cross-connect section for performing a cross-connect operation on a main signal including a working channel signal transmitted over a working path and a protection channel signal transmitted over a protection path; a memory section for retaining line setting information required for the cross-connect operation; and a cross-connect control section for controlling the cross-connect operation of the main signal cross-connect section, based on said line setting information so that one of the working channel signal and the protection channel signal is selectively output under the cross-connect operation of the main signal cross-connect section, wherein said cross-connect control section includes: an alarm detection section for detecting alarm information in the main signal; and an alarm information cross-connect section for cross-connecting the alarm information, detected by said alarm detection section, based on said line setting information retained in said memory section; and a switch control section for generating selection information specifying which one of the working signal and the protection signal should be selected for output under the main signal cross-connect operation, based on the line setting information and the cross-connected alarm information by said alarm information cross-connect section for outputting said selection information, said cross-connect operation for the main signal being operable to perform the main signal cross-connect operation based on said selection information output from said switch control section, and wherein said cross-connect control section further includes: a concatenation information detection section for detecting concatenation information relating to a combination of header data and subsequent data in the main signal; and a concatenation information cross-connect section for performing said cross-connect operation on said concatenation information, which has been detected by said concatenation information detection section, in accordance with said line setting information retained in the memory section, said switch control section being operable to generate selection information, based on said concatenation information as the result of the cross-connect operation of said concatenation information cross-connect section and said alarm information as the result of the cross-connect operation of said alarm information cross-connect section. ### Claim 6 (depends on 5) A cross-connect apparatus according to claim 5, wherein said concatenation information detection section encodes said concatenation information detected by said concatenation information detection section, and said switch control section generates said selection information, based on said concatenation information, which has been encoded by said concatenation information detection section and on which the cross-connect operation has been performed by said concatenation information cross-connect section. ### Claim 7 (depends on 5) A cross-connect apparatus according to claim 5, wherein the cross-connect control section subjects said subsequent data of said concatenation information to execute the same cross-connect control as said header data of said concatenation information.