Patent ID: 6944157

Claim:
A computer is configured to produce a transmission frame, said computer comprising: a processor, and a memory including software instruction is configured to enable the computer to perform the step of: producing the transmission frame having a first, a second, and a third byte, wherein the transmission frame comprises: a section overhead with a Regeneration Section Overhead (RSOH) and a Multiplex Section Overhead (MSOH), in which said MSOH comprises the third byte comprising at least one Source Node IDentification Extension bit, at least one Destination Node IDentification Extension bit and at least one bit indicating a change of the information in at least one of the first, the second and third byte: and said RSOH comprising the first and the second byte, said first byte comprising bits identifying the destination node and said second byte comprising bits identifying the source node, wherein said Source Node Identification Extension bits and said Destination Node Identification Extension bits, each comprise two bits and said at least one bit indicating a change of the information is four in number.