# US 10,122,446 B2 · Optical/radio local access network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,446 B2 - Document ID: US10122446B2 - Status: Granted - Kind: B2 - Application number: 15/211,082 - Filed: 2016-07-15 - Published: 2016-11-10 - Granted: 2018-11-06 - Earliest claimed: 2000-04-14 - Assignees: AT&T Intellectual Property II, L.P. - Applicants: At&T Intellectual Property II, LP - Inventors: David M. Britz; Jeevan Dodley; Lih-Yuan Lin; Robert R. Miller - Web page: https://patentgrep.com/patent/US10122446B2 ## CPC - H04B 10/11: Arrangements specific to free-space transmission, i.e. transmission through air or vacuum - H04B 10/0795: {Performance monitoring; Measurement of transmission parameters} - H04B 10/1123: {Bidirectional transmission} - H04B 10/1125: {using a single common optical path} - H04Q 11/0067: {Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring} - H04Q 2011/0026: {using free space propagation (e.g. lenses, mirrors)} - H04Q 2011/0081: {Fault tolerance; Redundancy; Recovery; Reconfigurability} - H04B: TRANSMISSION - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract A system that incorporates teachings of the subject disclosure may include, for example, a central controller that performs operations including monitoring multiple network nodes, at least some of the network nodes being in communication with others through respective point-to-point links. Each point-to-point link includes a respective free space optical channel. The central controller detects optical received signal strength of a free space optical channel falling below a certain level and provides control signals to reconfigure the multiple network nodes. Signals are re-routed along one of the respective point-to-point links through other network nodes responsive to detecting the optical received signal strength falling below the certain level Other embodiments are disclosed. ## Claims ### Claim 1 A controller in a wireless network that performs operations comprising: communicating with a plurality of nodes of the wireless network; detecting an optical received signal strength of a free space optical channel of a network route falling below a threshold level, wherein the network route comprises a first group of nodes of the plurality of nodes of the wireless network; and initiating a reconfiguration of the plurality of nodes of the wireless network according to an alternative network route responsive to the detecting of the optical received signal strength falling below the threshold level, wherein the initiating of the reconfiguration of the plurality of nodes comprises sending commands by way of a land line link. ### Claim 2 (depends on 1) The controller of claim 1, further comprising a wireless transceiver, wherein the operations further comprise sending commands to the plurality of nodes via the wireless transceiver. ### Claim 3 (depends on 2) The controller of claim 2, wherein the wireless transceiver is a radio telephone transceiver. ### Claim 4 (depends on 2) The controller of claim 2, wherein the commands control the operation of a switch in each node in the plurality of nodes that directs an exchange of data between a first network node and a second network node of the plurality of nodes. ### Claim 5 (depends on 4) The controller of claim 4, wherein the switch comprises a plurality of in-ports and a plurality of out-ports, wherein the switch performs routing of signals from the plurality of in-ports into the plurality of out-ports. ### Claim 6 (depends on 1) The controller of claim 1, wherein the operations further comprise receiving an alarm responsive to a signal strength of an optical receiver in a node of the plurality of nodes falling below a threshold level. ### Claim 7 (depends on 6) The controller of claim 6, wherein the alarm is indicative of adverse link conditions along a point-to-point link between nodes of the plurality of nodes. ### Claim 8 A method, comprising: detecting, by a controller within a wireless network, an optical received signal strength of a free space optical channel of a network route falling below a threshold level, wherein the network route comprises a first group of nodes of a plurality of nodes of the wireless network; and initiating, by the controller in communication with the plurality of nodes of the wireless network, a reconfiguration of the plurality of nodes of the wireless network according to an alternative network route responsive to the detecting of the optical received signal strength falling below the threshold level, wherein the initiating of the reconfiguration of the plurality of nodes comprises sending commands by way of a land line link. ### Claim 9 (depends on 8) The method of claim 8, wherein the optical received signal strength falling below the threshold level is a result of an adverse environmental condition. ### Claim 10 (depends on 8) The method of claim 8, further comprising communicating with the first group of nodes of the plurality of nodes of the wireless network by way of cellular radio telephone communication. ### Claim 11 (depends on 8) The method of claim 8, further comprising: generating an alarm responsive to the optical received signal strength falling below the threshold level; and transmitting the alarm to the controller by way of the land line link. ### Claim 12 (depends on 8) The method of claim 8, wherein each of the plurality of nodes is in communication via respective point-to-point links, and wherein each of the respective point-to -point links includes a first channel for coupling to a first network node of the plurality of nodes through a receive path and a second channel for coupling to a second network node of the plurality of nodes through a transmit path. ### Claim 13 (depends on 8) The method of claim 8, wherein each of the plurality of nodes performs routing of signals from a plurality of in-ports of a switch into a plurality of out-ports of the switch. ### Claim 14 A controller comprising a wireless transceiver, the controller performing operations comprising: detecting an optical received signal strength of a free space optical channel of a network route falling below a threshold level, wherein the network route comprises a first group of nodes of a plurality of nodes of a wireless network; sending control signals to the plurality of nodes via the wireless transceiver; receiving an alarm responsive to a signal strength of an optical receiver in a node of the plurality of nodes falling below a threshold level; and initiating a reconfiguration of the plurality of nodes of the wireless network according to an alternative network route responsive to the detecting of the optical received signal strength falling below the threshold level, wherein the initiating of the reconfiguration of the plurality of nodes comprises sending commands by way of a land line link. ### Claim 15 (depends on 14) The controller of claim 14, wherein the wireless transceiver is a radio telephone transceiver. ### Claim 16 (depends on 14) The controller of claim 14, wherein the operations further comprise coupling each of the plurality of nodes over a radio telephone system. ### Claim 17 (depends on 14) The controller of claim 14, wherein each of the plurality of nodes performs routing of signals from a plurality of in-ports of a switch into a plurality of out-ports of the switch. ### Claim 18 (depends on 14) The controller of claim 14, wherein each of the nodes is in communication via respective point-to-point links, and wherein each of the respective point-to -point links includes a first channel for coupling to a first node of the plurality of nodes through a receive path and a second channel for coupling to a second node of the plurality of nodes through a transmit path. ### Claim 19 (depends on 14) The controller of claim 14, wherein the detecting of the optical received signal strength of the free space optical channel falling below a level is indicative of adverse link conditions along a respective point-to-point link that provides a communication link between a first node and a second node of the plurality of nodes. ### Claim 20 (depends on 14) The controller of claim 14, wherein the reconfiguration of the plurality of nodes comprises causing a switch in a node of the plurality of nodes to direct signals between one of a plurality of input ports to one of a plurality of output ports.