US 6,982,989 B2
Transmission of data frames using low-overhead encapsulation and multiple virtual tributaries in a synchronous optical network
Jae Park, Congers, N.Y. (US); Roy McNeil, Warwick, N.Y. (US); and David Delgadillo, Plano, Tex. (US)
Assigned to Fujitsu Limited, Kanagawa-ken (Japan)
Filed on Jun. 11, 2001, as Appl. No. 9/878,723.
Prior Publication US 2002/0196811 A1, Dec. 26, 2002
Int. Cl. H04J 3/22 (2006.01); H04J 3/24 (2006.01)
U.S. Cl. 370—471 33 Claims
OG exemplary drawing
 
1. A meted of transferring variable-length data frames across a synchronous network employing a multiple-channel synchronous transport signal to carry data among nodes of the network, wherein each channel of the synchronous transport signal carries data in fixed-size payloads, comprising:
encapsulating each data frame in a corresponding point-to-point frame, each point-to-point frame including a body portion of the corresponding data frame and a length value, the length value being located at a predetermined position in a beginning portion of the point-to-point frame;
dividing each point-to-point frame into a corresponding set of fixed-sized segments, a first one of the segments of each set carrying the beginning portion of the corresponding point-to-point frame such that the length value is located at a predetermined position in the first segment;
transmitting the segments of each point-to-point frame as a corresponding set of payloads of at least one channel of the synchronous transport signal, each set of payloads being marked so as to be identifiable in a stream of payloads of the at least one channel of the synchronous transport signal;
receiving each set of payloads of the at least one channel of the synchronous transport signal, and from each received set of payloads regenerating the corresponding point-to-point flame based at least in part on the length value from the first segment; and
de-capsulating each regenerated point-to-point frame to recover the corresponding data frame.