Method and device for providing a minimum congestion flow of ethernet traffic transported over a SDH/SONET network

A device for minimum congestion transporting of Ethernet frame signals in a synchronous network, the synchronous network comprising network elements and fiber connections connecting the network elements, the device comprising:

• at least one access point for receiving and outputting Ethernet frame signals;
• a router of the received Ethernet frame signals to at least one link, wherein the link is a pair of Ethernet access points providing a point-to-point connection in the network;
• a sender of frames to available circuits, wherein the circuits are possible routes connecting the pair of Ethernet access points through the network;
• and
• an encapsulator which encapsulates the Ethernet frame signals into at least one Virtual Container of a selected available Path,
• wherein said router generates a delay marker which is transmitted to a receiving point and back to a sending point through the circuits;
• wherein a calculator calculates a time frame for the sending point to receive back the delay marker;
• an estimator estimates a congestion of the circuits based on the time frame for receiving back the delay marker;
• and
• an assignor which assigns said Ethernet traffic to be transported in said synchronous network to at least one of said circuits having the minimum estimation of said congestion.