Transport system and transport method
AssigneeNippon Telegraph and Telephone Corporation
InventorsMasahito Tomizawa, Yoshiaki Kisaka, Yutaka Miyamoto, Takashi Ono, Hiromu Toba
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Abstract
A signal transport system and a transport method are provided. A whole lowspeed signal containing a client overhead received from a client network is transparently subjected to time division multiplexing and an additional overhead is inserted in the whole signal and further subjected to wavelength division multiplexing, so that the digital signal having the addition overhead is transported in the wavelength division mode represented by one wavelength to a receiving equipment.
Claims30
A transport system comprising:
- time division multiplexing means for applying time division multiplexing of a whole signal of a client including client overhead transparently;
- attaching means for attaching an additional overhead to said whole signal of said client;
- and
- wavelength division multiplexing transporting means for transporting a time-division-multiplexed signal represented by one wavelength containing said additional overhead from one network to another network by applying wavelength division multiplexing,
- wherein said additional overhead contains bits defining frame synchronization or channel selection, and an insertion cycle of said bits is shorter than a frame cycle of client signals,
- wherein said additional overhead contains bits defining error correction, and said system performs error correction,
- wherein said additional overhead contains bits defining data storage for applying negative stuffing to adjust a frequency of a client clock, and positive stuffing is applied by inserting said bits in a payload,
- wherein said additional overhead contains bits defining stuffing information, and
- wherein said time division multiplexing is based on bit interleaving or byte interleaving.
A method for wavelength division multiplexing by first applying time division multiplexing transparently to whole signal of a client and attaching an additional overhead to the whole signal and representing the whole signal having the additional overhead by one wavelength and transporting a wavelength division multiplexed signal through a network, wherein said additional overhead contains bits defining frame synchronization or channel selection, and an insertion cycle of said bits is shorter than a frame cycle of client signals, wherein said additional overhead contains bits defining error correction, and said system performs error correction, wherein said additional overhead contains bits defining data storage for applying negative stuffing to adjust a frequency of a client clock, and positive stuffing is applied by inserting said bits in a payload, wherein said additional overhead contains bits defining stuffing information, and wherein said time division multiplexing is based on bit interleaving or byte interleaving.
Dependencies are inferred from the claim text.