Alcatel

Alcatel Lucent

Pietro Grandi

Gert Grammel

Italo Busi

Alberto Bellato

Vincenzo Sestito

Michele Fontana

Sergio Belotti

Giovanni Zangrando

Matteo Gumier

Stephen John Trowbridge

Livia Schweizer

Francesco Pesce

Ray Qiu

Sergio Torassa

A method of localizing failures occurring along a transmission path is provided. A data signal is transmitted along the transmission path, which comprises a path segment. A first network node performs a tandem connection monitoring source function of a tandem connection. A second network node monitors the transmission along the path segment, by performing a tandem connection monitoring sink function. When the first network node detects a failure of the data signal, the first network node enters information indicating a data signal failure into the data signal's overhead field. When the second network node detects a failure by the tandem connection monitory sink function, the second network node enters information into the overhead field. When a third network node detects a failure of the data signal, the third network node uses the information in the overhead field to determine whether the failure occurred within or outside of the path segment.

Method of localizing a failure occurring along a transmission path

An exemplary method and apparatus are provided for exchanging information for establishing a path between a first node and a second node of a communication network. The first node and the second node are adapted to send continuity check messages to monitor the established path. The technique includes generating, at the first node and at the second node, at least one link state message according to a routing protocol; inserting continuity check link state information into the at least one link state message; and exchanging between the first node and the second node, the link state messages for computing the path. The continuity check link state information are indicative of at least one rate of transmission of the continuity check messages supported by the first node and the second node.

Method for exchanging information for establishing a path between two nodes of a communication network

An exemplary method and apparatus are provided for data transmission in an optical transport network that includes receiving client data from a client, mapping the client data into a frame structure, mapping the frame structure into tributary slots of a data transport structure, and transmitting the data transport structure. The data transport structure contains a fixed number of tributary slots and the size of the frame structure is selectable in granularity of the tributary slots of the data transport structure.

Method for data transmission in an optical transport network

The present invention provides for a method for Enhanced Equipment Protection Switch for Customer's device Dual-Homing, in an interconnection between a Central site/Pop and a Transport Network Hub by two boards. Each board is simultaneously connected to the Switching Matrix of the Transport Network Hub with B/2 bandwidth. Both boards receive the band B from the Central site/Pop, and send half a band B/2 directly to the Switching Matrix, and the other half band B/2 to the other board.

Method for the protection of the connection between a transport network hub and a central site/pop

Method of processing MPLS packets in a telecommunication equipment comprising the following steps in the following order:

Methods of processing data packets at layer three level in a telecommunication equipment

The present invention provides for a method and apparatus for an end-to-end connection between an RPR and an MPLS network, where the RPR network is linked to the MPLS network (and viceversa) through a TLS layer. In a preferred solution, the client layer is Ethernet, but any client layer can be considered.

Method and apparatus for end-to-end connection between an RPR and an MPLS network

Described is a SDH or SONET telecommunication network element provided with a plurality of interfaces for managing first SDH or SONET flows, comprising: a) a plurality of first layer ports for managing second SDH or SONET flows, wherein the ports are individually programmable as concerns the hierarchical structure of the managed flows, and b) a switching system coupled to the interfaces and to the ports, in order to implement the switching of virtual containers between the SDH or SONET flows, wherein the switching system is programmable as far as the switching to be implemented is concerned.

Programmable element of synchronous network and method for managing it

Described is a method extending the OAM functionality in the RPR networks through a new OAM loopback procedure of request-reply type together with the definition of a new RPR OAM loopback frame. The OAM loopback function allows any RPR station to check the reachability of another RPR station. It is not necessary to stop any data traffic communication on the network in order to perform this function.

Method for implementing an OAM function by exchanging request-reply packets between stations of a RPR network, and corresponding packet frames

The method allows to share, within a network element of a telecommunication network, routing information deriving from a first routing source; the network element is of the type comprising a management agent provided with a management information database, wherein different routing information deriving from different routing sources is stored in different routing databases within the network element; according to the method, the management agent performs the steps of: a) receiving from a management manager route mapping information; b) storing into the management information database route mapping information corresponding to the received route mapping information; and c) retrieving and using the stored route mapping information for exporting said routing information from a first routing database of the first routing source and importing it into a second routing database of a second routing source.

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Milan, Italy

Pietro Grandi