A method is provided for carrying out channel performance monitoring in an optical communication system. The method comprising: receiving an optical signal; obtaining digitized samples associated with the optical signal; storing the digitized samples; carrying out an off-line processing of the stored samples. The of...

A method and an apparatus are provided for monitoring OSNR system margin in optical networks by relying on relationships that exists between the Optical Signal to Noise Ratio (OSNR) value and the Electrical Signal to Noise Ratio (ESNR) value.

The invention relates to a method for utilizing a Spanning Tree Protocol, (-STP-), in an Ethernet network wherein a number of VLANs are defined and a plurality of Ethernet switching nodes

A technique for determining averaged Q-factor, Qavg, for an optical binary signal transmitted at a bit rate X, based on amplitute histogram evaluation and on asynchronous sampling. The technique is inexpensive since it uses sampling pulses, which have bit rate Y lower than X and are not synchronized with the op...

The invention concerns shutting down and restarting optical amplifiers, such as Raman amplifiers, in an optical link, depending whether the optical amplifier is a transmitting side amplifier or a receiving side amplifier. For controlling the amplifiers, at least one diagnostic signal is to be transmitted via an a...

A method for selecting a relation between a gain Gf of a Forward Raman Amplifier (FRA) at a transmitting end of a fiber optic transmission line and an optical signal to noise ratio (OSNR) at a receiving end of the fiber optic transmission line satisfying limitations for real long transmission lines. The method comp...

Technology for combating loops in multi-domain networks, by assigning to network domains categories, at least such as "high/trusted" and "low/less trusted", and by making a decision about relearning Forwarding Information Base FIB of any edge node interconnecting different network domains, utilizing the assigned cat...

A technique is described for controlling and optical network composed of network elements (NEs), with the aid of a network controller (NC) being in communication with the network elements. The technique includes collecting, by the network controller NC, information on the NEs therefrom, and, whenever a change in the...

Method and apparatus for interconnecting local and/or remote agents serving a call-center, which are locally connected to said call-center or distributed over an IP network, respectively, with customers/callers who are telephonically connected to the call-center, or distributed over an IP network. The distributed ...

A technique for carrying out protection of data traffic in a multi-channel multi-section optical communications network by simultaneously using Optical Multiplexed Section (OMS) protection and Optical Channel (OCH) protection; the technique comprises selection of a working optical signal in an OCH protected optical ...

A technique for exchanging LCAS control information between a first network element and a second network element interconnected by a bi-directional optical communication line, while conveying substantially unidirectional data traffic in the form of a virtual concatenated group (VCG) binary stream transmitted in a ...

Technique for fast rerouting (FRR) of traffic in a communication network, from a working path comprising a link with its downstream node, to one or more backup paths concurrently providing link protection and node protection to the link and the downstream node; the method comprises enabling the downstream node t...

The invention relates to a method of finding connectivity solutions for networkelements to be switched into a path selected in a network managed by anetwork management system NMS, wherein each network element comprisesinput ports and output ports, each of the ports providing a plurality of ...

TITLE: METHOD FOR REROUTING MPLS TRAFFIC IN RING NETWORKSA method is described for fast rerouting, in case of a fault, packets of MPLStraffic in a ring-like network configuration, where the MPLS traffic is formed byone or more Label Switched Paths (LSPs) entitled to protection. The method

Technology for rerouting a data stream in a communication circuitswitched mesh network comprising one or more cross-connecting nodes,the data stream comprises a plurality of data frames each associated withat least one overhead byte, and the rerouting is performed by using a pathident...

A method for recovery of a traffic flow being conducted via a communication line in a multi-layer communication network, the traffic flow comprising a Guaranteed traffic portion GT and a Best Effort traffic portion BET assigned to respective bandwidth resources of the line. The communication network comprising at...

A method for power control of optical transmission span providing real timecontrol of power per optical channel in a multi-channel optical communicationline formed by a group of optical elements connected in a chain by fiber spans,wherein the group of elements comprises one or more optical ...