Abstract: An optical packet node for receiving and transmitting optical packets is disclosed. A multiwavelength band splitting device splits received optical packets transmitted via multiwavelength bands into at least three groups, each group including one multiwavelength band. A multiwavelength band combining device combine the three groups of multiwavelength bands. At least two optical packet add drop multiplexers are placed between the multiwavelength band splitting device and the multiwavelength band combining device. Each optical packet add drop multiplexer adds and drops at least one individual wavelength to a respective multiwavelength band group. A load balancing stage is connected to the optical packet add drop multiplexers to provide an interconnection between at least two wavelength bands.

Abstract: A photonic switching device for switching without contention data in the form of optical packets includes a space switching matrix with a plurality of input ports and a plurality of output ports. A unit external to the space switching matrix includes a buffer memory common to all the output ports of the matrix. Each of the output ports provides access to the buffer memory via a space switching stage consisting of switches having a 1-to-2 switching function.

Abstract: A router includes a first processing module (1) adapted to route primary resources as a function of instructions received, inputs (2) adapted to feed the first processing module (1) with primary resources, outputs (3) adapted to collect primary resources switched by said first processing module (1), a second processing module (6) adapted to process secondary resources to be added or dropped, and coupling means (9) including a drop bus (8) and/or an add bus (7) and adapted, on the instructions of the control means (15), to drop either the whole of a primary resource arriving at one of said inputs (2) and/or outputs (3) or a portion thereof to feed said second processing module (6), and/or to add a secondary resource processed by said second processing module to a primary resource received at one of said inputs (2) and/or outputs (3) and in transit to a common destination.

Abstract: A packet-switched communications network (PSN) includes a multiplicity of nodes (Ni) adapted to switch streams of packets benefiting from circuit emulation services, known as CES packets. The network uses a particular method of resynchronizing the CES streams. According to that method, for a CES stream intended to take an associated path (CE) from an ingress node (N1) passing through a set of nodes including a subset of nodes adapted to resynchronize CES streams selectively, effective resynchronization of said stream by a node selected from said subset is conditioned by a value representative of the cumulative jitter suffered by said stream as far as that node.

Abstract: The network comprises an optical interconnection tree linking sending points of stations to a receiving point of a concentrator via access links (F1-F3), a coupling system (C) and a common optical link (OL). The stations can send optical signals (?u1, ?u2, ?u3) each carried by the same “uplink” wavelength (?u). Each station includes a carrier detection system able to detect the presence at its sending point (Ki) of an optical wave at said uplink wavelength (?u) that was not sent by the same station. The detection system cooperates with sending control means to inactivate sending if such presence is detected. The network further includes: an emulator (LDa, Ca, G1-G3) adapted to send auxiliary waves (?a1, ?a2, ?a3) at said uplink wavelength (?u) and to couple them into the access links (F1-F3) so that they propagate in the downlink propagation direction; and a control system (2a) of the emulator for selectively activating the sending of the auxiliary waves.

Abstract: A method is dedicated to transmitting data between nodes (Ni) of a group of nodes coupled to an access bus (L2-LSP) of a communications network (R1).

Abstract: A system (D) is dedicated to processing data frames for a communications network that supports one or more communications protocols. The system comprises, firstly, detection means (MD) adapted, on receipt of a data frame, to determine, from a plurality of sets of predefined values corresponding to respective different forms of protocol processing, the set containing a value taken by a selected frame field contained in the received frame and used by the protocol, and, secondly, processing means (MT) adapted to determine a specific form of protocol processing corresponding to the set determined by the detection means (MD) and to be applied to the received frame.

Abstract: A switch for an optical transmission network using wavelength division multiplexing has p1 input ports receiving p1 wavelengths and first switching means for switching the p1 wavelengths to p2 output ports, q1 input ports receiving q1 bands of wavelengths and second switching means for switching the q1 bands to q2 output ports, r1 input ports receiving r1 groups of bands and third switching means for switching the r1 groups of bonds to r2 output ports. The three switching means consist of a single switching matrix adapted to couple any of the p1+q1+r1 input ports to any of the p2+q2+r2 output ports. This single-matrix architecture can switch all the granularities at the same time, which facilitates reconfiguration as a function of evolution of the traffic to be switched.

Abstract: This invention relates to a Method for setting up a logical connection between non-adjacent initial node (Ni) and final node (Nf) in a telecommunications network (T), the method comprising determination of a spatial route (ROUTE1) comprising at least a so-called transit node (N1, N4, N6, N9) intermediate between the final node and the initial node and a sequence of route segments connecting the nodes in pairs, the initial node sends a reservation query (RQ1) associated with the spatial route, the query containing values of parameters characteristic of the connection and passing through at least the first transit node (N1) of the spatial route and with the final node as the final destination. The method also comprises an automatic calculation by a transit node, called a decisional node (N4, N9) based on local information, the said calculation result (c4, sp4, sp9) possibly being capable of modifying at least one of the said values of the connection parameters.

Abstract: Dynamic method of adding data at the nodes of a fiber optic transmission network comprising at least one source node, one destination node and a plurality of intermediate nodes, the nodes being connected by a fiber optic connection. The method comprises the steps of creating at the source node an optical resource comprising portions containing data packets addressed to said destination node and free portions that may be occupied by packets supplied by each of said intermediate nodes, when said resource transits an intermediate node, detecting if said resource comprises free portions if said intermediate node has at least one data packet to transmit, and adding said data packet to a free portion of the frame if said free portion may contain said data packet.

Abstract: The method aims to allocate a resource (WB1) in a telecommunications network (10) having a multigranular architecture and a given topology defining links, the network comprising first resources called higher resources having a higher granularity than second resources called lower resources. The method comprises a step No. 1 of determining traffic demands relating to said lower resources, a step No. 2 relating to subpaths with a cost function, a step No. 3 comprising electing the best subpath (BE) given the cost function and allocating at least one higher resource to said best subpath for handling at least a portion of the lower resources, a step No. 4 of updating the traffic demands relating to the lower resources, and a step No. 5 of reiterating steps No. 2 to No. 4 until any allocation of a higher resource provides no further improvement in the light of the cost function.

Abstract: In order to determine a spectral route for a given connection in an optical telecommunications network (T) between a starting node (ON1) and a destination node (ON6) of the network, the method consists in: using a conventional routing method to determine one or more candidate spatial routes (Route 1, Route 2) connecting the starting node (ON1) to the destination node (ON6), each candidate spatial route comprising a sequence of route segments, each segment connecting two nodes of the network directly and being adapted to support a plurality of spectral routes, sending a route set-up request message from the starting node (ON1) to the destination node (ON6), collecting parameter values in the message as it passes through each node along the candidate spatial route, in particular transparency parameter values characterizing the spectral dimension (availability of wavelengths, physical parameters varying as a function of the occupation of the links), and, finally, using an optimization method to process all the p

Abstract: A device (D) is dedicated to controlling auxiliary paths (CP, SC) in a hybrid optical communications network comprising a multiplicity of hybrid nodes (NO) including switching means (CM1) and color converter means (CM2) and interconnected by transmission lines. The device comprises processor means (MT) adapted, in the event of a fault on at least one of the transmission lines carrying a connection and at the ends of which are two hybrid nodes (NO) adapted to effect switching in opaque mode, to command the switching means (CM1) of at least one of the hybrid nodes (NO) to switch the optical signals taking the connection to a selected auxiliary path independent of color and passing through said nodes, where applicable after color conversion of the optical signals by the associated converter means (CM2).

Abstract: A communications station (4-i) for a WDM ring network is adapted to insert into an optical fiber (2) packets of optical signals carried by at least one wavelength and having a propagation direction in common with at least one other communications station.

Abstract: The invention relates to optical ring network comprising stations (340) which are connected to at least one optical fiber by means of the couplers, the two ends of the optical fiber being connected to a point of presence or an optical network access node. The point of presence comprises (k)at least an optical emitter (330-1) which emits a falling optical signal having at lest one first wavelength (420) in the direction of one end oft he optical fibers (455) and (ii) at least one optical receiver (330-2) which receives a rising optical signal having at least one second wavelength which is different from the first wavelength. The aforementioned optical network access node comprises mean such as a hub (320) which can be used for the communication between the optical receiver (320-2) and the optical emitter (330-1). The wavelength of rising signals and the wavelength of the following signals are shared by several stations.

Abstract: The present invention relates to a scheduler, also referred to as a service discipline, for a system comprising a plurality of nodes sharing a plurality of resources such as wavelengths. The scheduler 2 of the invention schedules the transmission of data from a plurality of queues B1, B2, and B3 from a source node 1 to a plurality of destination nodes N1, N2, and N3 via a plurality of outlet ports P1, P2, P3, and P4 from said source node 1, each of said outlet ports P1, P2, P3, and P4 being associated with a resource OR1, OR2, OR3, and OR4, the data being transmitted via said resource to a destination node N1, N2, and N3, each of said nodes receiving data from all or some of said plurality of resources OR1, OR2, OR3, and OR4.

Abstract: An optical ring network comprises “active” first and second optical fibers (2 and 3), each connected via at least one of its two ends to an access node and optically coupled to stations (4), the fibers being dedicated respectively to transferring data to said stations and to transferring data from said stations. Each station (4) also has monitoring means (10) capable of determining whether the station is authorized to transmit data over the active second fiber (3), and the access node has transfer means arranged to transfer onto the active first fiber (2) any data conveyed by the active second fiber (3) and addressed to at least one of the stations.

Abstract: The invention simulates the behavior of a network including a set of network elements by introducing into the network a parametered flow intended to simulate a constraint on a network element. The flow can model the variation in time of the traffic intensity in the network in relation to the or each element to which a flow is addressed in the context of the simulation, and can feature a modulation on a macroscopic timescale and stochastic fluctuations on a microscopic scale. The invention further provides on-demand dimensioning of a network by uprating, during the simulation, the levels of performance of elements that have manifested a weakness in relation the flow at the time of the simulation. The field of application targets any type of network: circuit mode or packet mode data, electronic or optical networks, and even networks for transporting material or nonmaterial commodities.

Abstract: An optical packet node for receiving and transmitting optical packets is presented, which comprises: a multiwavelength band splitting device for splitting received optical packes transmitted via multiwavelength bands into at least three groups, each group including one multiwavelength band, a multiwavelength band combining device for combining said at least three groups of multiwavelength bands, at least two optical packet add drop multiplexers, each optical packet add drop multiplexer being placed between said multiwavelength band splitting device and said multiwavelength band combining device, and each optical packet add drop multiplexer serving to add and to drop at least one individual wavelength to a respective group of a multiwavelength band, and a load balancing stage being connected to at least two of said optical packet add drop multiplexers, to provide an interconnection between at least two wavelength bands.

Abstract: A photonic switching device for switching without contention data in the form of optical packets includes a space switching matrix with a plurality of input ports and a plurality of output ports. A unit external to the space switching matrix includes a buffer memory common to all the output ports of the matrix. Each of the output ports provides access to the buffer memory via a space switching stage consisting of switches having a 1-to-2 switching function.