Patent ID: 8582426

Claim:
A method of receiving frames by a receiving device in a communication network, wherein the receiving device has a first network controller and a second network controller connected respectively to a first line and a second line for receiving frames sent by a sending device over the network, the method comprising: a) determining if a frame received over the first line is a second frame of a pair of two redundant frames each respectively transmitted over one of two lines; and b) forwarding the frame to a subsequent layer of the protocol stack of the receiving device for further processing unless the frame is a second frame, wherein the method further comprises, prior to step a), calculating by the receiving device, a redundancy identifier for a received frame, determining that the received frame is a redundant frame of a pair of two redundant frames each respectively transmitted over one of two lines if the calculated redundancy identifier is equal to a content of a field of predetermined length located at a redundancy identifier position of the received frame, and otherwise determining that the received frame is a singular frame transmitted over the first line only, and forwarding the singular frame to a subsequent layer of the protocol stack of the receiving device for further processing.