Justification insertion and removal in generic mapping procedure in an optical transport network

摘要

A method and apparatus are provided for generating Generic Mapping Procedure (GMP) stuff/data decisions, which avoids brute force modulo arithmetic and is efficient for hitless adjustment of ODUFIex (G.7044) in an Optical Transport Network (OTN). Addition operations are used, rather than multiplication operations, to facilitate faster and less computationally expensive calculation of data/stuff decisions, based on calculated residue values. Residue values are logically arranged in rows to facilitate residue calculation, such as based on relationships with previously calculated residue values. This method is also applicable for mapping and de-mapping Constant Bit Rate (CBR) clients into and from an ODUk carrier.

主权项

1. A computer-implemented method of identifying M-byte wide data/stuff bytes in a mapping operation or multiplexing operation in an Optical Transport Network (OTN) comprising:
organizing residues of a plurality of data/stuff decisions in rows of W residues, in order of incrementing index; generating a first row of residues and corresponding flags sequentially in order of index using an incremental method based on a first addition operation and recording the last residue of the first row; generating a subset of residues and corresponding flags in subsequent rows using a stride method based on a second addition operation; generating remaining residues and corresponding flags in subsequent rows using the incremental method based on residues derived from the stride method as starting point; deriving a word-level stuff/data decision from each residue; and expanding each word-level data/stuff decision to cover all bytes within an M byte word.