Demultiplexing high-order to low-order ODU signals in an optical transport network
AssigneePMC-Sierra US, Inc.
InventorsWinston Ki-Cheong Mok, Somu Karuppan Chetty, Jonathan Avey
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Abstract
A method and apparatus are provided for de-multiplexing one or more Low-Order ODUj/ODUflex clients from a High-Order ODUk carrier. The number of TribSlots assigned to an ODUflex may be increased and decreased hitlessly, in accordance to ITU-T G.7044. In the Multiplexing direction, a Space-Time-Space switch is used to interleave bytes from Low-Order ODUk words into High-Order ODUk words. In the De-multiplexing direction, a similar switch is used to extract Low-Order ODUj bytes that are interleaved inside High-Order ODUk words and re-arrange them into Low-Order ODUj words.
Claims22
A method of demultiplexing a plurality of Low-Order (LO) Optical Channel Data Unit-j (ODUj) clients from a High-Order (HO) Optical Channel Data Unit-k (ODUk) in an Optical Transport Network (OTN), the method comprising:
- re-arranging and demultiplexing bytes from HO ODUk data words into a plurality of rate justified LO ODUj data words in accordance with a tributary slot assignment for a selected LO ODUj of the HO ODUk using a permutation matrix;
- and
- removing pad words among the plurality of rate justified LO ODUj data words, using a compactor block, such that only LO ODUj client data words remain.
A system for demultiplexing a plurality of Low-Order (LO) Optical Channel Data Unit-j (ODUj) clients from a High-Order (HO) Optical Channel Data Unit-k (ODUk) in an Optical Transport Network (OTN) comprising:
- a space-time-space (STS) switch including a permutation matrix for re-arranging and demultiplexing bytes from HO ODUk data words into a plurality of rate justified LO ODUj data words in accordance with a tributary slot assignment for a selected LO ODUj of the HO ODUk;
- and
- a compactor block for removing pad words among the plurality of rate justified LO ODUj data words, such that only LO ODUj client data words remain.
Dependencies are inferred from the claim text.