Orange

France Telecom

Sebastien Jobert

Esther Le Rouzic

Nicolas Brochier

Frédéric Jounay

Isabelle Hamchaoui

Yves Morlon

A technique is provided for processing a data stream between a server and a client entity in a packet communication network. The data stream is composed of packets steered by a processing device. Upon the receipt of a first packet of the data stream, the processing device implements a phase of observing this data stream, in the course of which the packets of the data stream which are exchanged between the server and the client entity and which follow the first packet are transmitted. On detection of congestion associated with the data stream, the data stream is then rejected and the processing device does not transmit packets of the data stream which are exchanged between the server and the client entity and are received after detection of the congestion.

Technique for processing a data stream between a server and a client entity

A method of routing synchronization messages in a packet communication network, in which a packet is routed using a global routing table. A piece of equipment in the network implements the following steps: detecting a packet carrying a synchronization message in a packet stream; determining an output port; emitting a packet carrying the message at the determined output port, the message being modified using a piece of information representing a time of transit in the equipment. A synchronization routing table, which stores at least one association between an input port and at least one output port, is configured in the equipment. When the packet carrying the received message indicates a routing needs to be carried out using the synchronization table, the output port for this packet is determined by the equipment according to an input port on which the packet is received and by reading the synchronization table.

Method of routing synchronization messages

A system is provided for determining a propagation time of an optical signal between two devices in an optical transmission network. The first device is designed to determine the propagation time following the transmission of an optical measurement signal in a propagation direction towards a second device using an optical link while passing through an intermediate device, which includes at least one amplifier and one chromatic-dispersion compensation module that introduces a delay, and following the reception an optical return signal from the second device using the same optical link in a direction opposite to the propagation direction. The measurement system is configured to extract the return signal output by the intermediate device; regenerate the extracted return signal; feed the regenerated signal into the optical link, at the input of the intermediate device; and obtain a return signal-reception time while taking account the delay introduced by said compensation module.

System for determining a propagation time of an optical signal between two optical devices using an optical link

For phase synchronizing nodes, on a node by node basis, following a tree-structured phase distribution network using the infrastructure of a telecommunications network, a first node transfers to a second node phase information substantially in phase with a phase reference internal to the first node and position signaling of the phase information with respect to component elements, such as bits, of a data signal carried by a link linking the nodes. The position signaling can be the number of component elements separating it from the phase information in a packet. The time to transfer the phase information through the link is precisely compensated.

Phase synchronizing nodes in a telecommunications network

A method and apparatus for measuring a propagation delay of an optical signal between first and second devices in an optical transmission network, the optical signal being transmitted from the first device to the second device via a first optical fiber and from the second device to the first device via a second optical fiber. The second device includes a loopback having a first mode enabling the optical signal to be routed between the two devices. The method includes: detecting by the second device a triggering by the first device of a propagation delay measurement; receiving a measurement signal transmitted by the first device via the first optical fiber; and configuring the loopback in a second mode in which the loopback injects a return signal into the first fiber in response to the measurement signal. The first device implements a method for determining the propagation delay.

Technique for determining a propagation delay of an optical signal between two optical devices via an optical link

A method and apparatus are provided for processing a delayed resource reservation request in an optical telecommunication network for transferring data between a source device and a destination device, wherein the control plane is different from the transfer plane. Upon a node device of the network receiving the resource reservation request sent from the source device to the destination device via a path including at least one node device, the request containing at least one first parameter relating to the start of the connection at the source device, the method includes the following steps: obtaining information relating to a signal transfer time via the path up to an upstream node device; updating the information by adding a signal transfer time at the intermediate equipment; and calculating a date for the start of the resource reservation at the node device using the value of the first received parameter and the information.

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Begard, France

Sebastien Jobert