Alcatel Lucent

Nokia Solutions and Networks Oy

Riccardo Gemelli

Luigi Ronchetti

Silvio Cucchi

Carlo Costantini

Vincenzo Sestito

Silvano Frigerio

Andrea Paparella

Giorgio Cazzaniga

Hans-Jörg Jäkel

Giuseppe Badalucco

Giuliano Corbetta

Annagiulia Tiozzo

Alessia Pina

Davide Cattaneo

Luigi Ronchette

It is disclosed a method for updating a cumulative residence time of a synchronization packet received at a node of a packet-switched communication network. The cumulative residence time is equal to a cumulative sum of residence times of the packet at nodes interposed between a further node which has generated the packet and the node. The node comprises an ingress circuit and an egress circuit. The method comprises: receiving the packet at the egress circuit from the ingress circuit; at a timestamp generator of the egress circuit, generating a timestamp; at the egress circuit, calculating a virtual timestamp based on the timestamp and on an estimated variable delay that will be undergone by the packet due to buffering in a buffer located downstream the timestamp generator; and, at the egress circuit, using the virtual timestamp for updating the cumulative residence time, before transmitting the packet to a still further node.

Update of a cumulative residence time of a packet in a packet-switched communication network

A network element for a digital transmission network is proposed. The network element contains two switching matrices for switching data cells, as well as ingress ports that receive TDM traffic flow and packet traffic flow and segment the traffic flows into cells. A control system for controlling the configuration of the ingress ports and the switching matrices controls the ingress ports, in case of no failure of the switching matrices, to forward the TDM traffic flows to both switching matrices and to split the packet traffic flow over the two switching matrices.

Device and method for switching data traffic in a digital transmission network

There is described a method for transmitting N parallel data flows on a parallel bus. The method comprises, at a first communication device: generating a further parallel data flow comprising alignment words periodically distributed with a period; at each period, rotating the N of parallel data flows and the further parallel data flow thus generating N+1 rotated parallel data flows, each comprising part of the alignment words periodically distributed with a frame period; transmitting the N+1 rotated parallel data flows on respective physical connections of the parallel bus. The method further comprises, at a second communication device: aligning the N+1 rotated parallel data flows by using the alignment words, thus compensating skew and obtaining N+1 aligned parallel data flows; and at each period, de-rotating the N+1 aligned parallel data flows, thus generating N de-rotated parallel data flows corresponding to the N parallel data flows.

Transmission of parallel data flows on a parallel bus

Equipment protection of a switch matrix (SM) in a network node, which contains a number of matrix modules (M-M, E-E) is achieved by slicing an input signal into k parallel signal slices (x()-x()) with k&#x3e;2; coding the k signal slices into a number of n coded signal slices (x()-x()) with n&#x3e;k+1 using an error correcting code to add redundancy to said input signal; switching said n coded signal slices through the switching matrix (SM) via n distinct matrix modules; and decoding the n coded signal slices into k decoded signal slices to correct errors introduced while passing through said switch matrix. Preferably, the switch matrix (SM) contains a first number of matrix boards (MB-MB, EB, EB), each carrying a second number of matrix modules (M-M, E-E). The n coded signal slices are switched via matrix modules on n distinct matrix boards.

Equipment protection method and apparatus

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Settimo M.se, Italy

Riccardo Gemelli