Coding scheme using a transition indicator for signal transmission in optical communications networks
DC CAFC
First Claim
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1. A method for transporting multi-word information groups containing data words and control characters over a communications link, comprising the steps of:
- (a) determining whether each of said information groups includes control characters;
(b) for each information group that does not include control characters, setting a data indicator and combining said data indicator with the data words of the information group to generate an encoded information stream including said data indicator and the data words; and
(c) for each information group that includes one or more control characters, generating an encoded information stream by the steps of, (i) encoding the control characters to control codes, (ii) generating a transition indicator based on the number of control characters for indicating the occurrence of a final control code in the encoded information stream, (iii) generating a location pointer for each of the control codes representative of the sequential position within the information group for each of the corresponding control characters, and (iv) combining the control codes, the data words, said location pointers, and said transition indicator for each information group to form the encoded information stream.
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Abstract
A coding scheme is provided transporting encoded information over an optical communications link to a network. Multi-word information groups are analyzed to determine whether each of the information groups includes control characters. If the information group does not include any control characters, an encoded information stream including a set data indicator and data words is generated. If the information group includes one or more control characters, an encoded information stream is generated which includes control code counters, a transition indicator, location pointers, control codes that are encoded from the control characters, and any data. Accordingly, the necessary bandwidth for transporting the information is reduced by using this encoded information stream without sacrificing any control information.
13 Citations
20 Claims
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1. A method for transporting multi-word information groups containing data words and control characters over a communications link, comprising the steps of:
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(a) determining whether each of said information groups includes control characters;
(b) for each information group that does not include control characters, setting a data indicator and combining said data indicator with the data words of the information group to generate an encoded information stream including said data indicator and the data words; and
(c) for each information group that includes one or more control characters, generating an encoded information stream by the steps of, (i) encoding the control characters to control codes, (ii) generating a transition indicator based on the number of control characters for indicating the occurrence of a final control code in the encoded information stream, (iii) generating a location pointer for each of the control codes representative of the sequential position within the information group for each of the corresponding control characters, and (iv) combining the control codes, the data words, said location pointers, and said transition indicator for each information group to form the encoded information stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. The method for transporting multi-word information groups containing data and control characters over a communications link, comprising the steps of:
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(a) encoding each of said information groups to an encoded information stream including a data indicator and data words when said information group does not include control characters; and
(b) encoding control characters to control codes, generating a transition indicator and location pointers, and combining said control codes, said transition indicator, said location pointers, and any data words present in said information group to form said encoded information stream when one or more control characters are included in said information group. - View Dependent Claims (9)
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10. A method for transporting multi-word information groups containing data and control characters over a communications link, comprising the steps of:
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(a) encoding each of said information groups to an encoded information stream including a data indicator and data words when said information group does not include control characters; and
(b) encoding control characters to control codes, generating a transition indicator and location pointers, and combining said control codes, said transition indicator, said location pointers, and any data words present in said information group to form said encoded information stream when one or more control characters are included in said information group, wherein said step (a) further comprises the step of generating the encoded information stream to include a plurality of data fields when said information group does not include control characters, the number of said data fields corresponding to the number of words in said information group, and wherein said encoded information stream comprises a first variable length bit field for storing control code counters and said transition indicator, a second variable length bit field for storing said location pointers, a third variable length bit field for storing said control codes, and a fourth variable length bit field for storing any data words present.
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11. A system for transporting multi-word information groups containing data words and control characters over a communications link, comprising:
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a rate optimizing encoder for determining whether each of said information groups includes control characters, for each information group that does not include control characters, said rate optimizing encoder setting a data indicator and ordering said data indicator and the data words, and for each information group that includes one or more control characters, encoding the control characters to control codes, generating a transition indicator and a location pointer for each of the control codes, and ordering said transition indicator, said location pointers, said control codes and any data words; and
a serializer for generating an encoded information stream by combining said data indicator and the data words for each information group that does not include any control characters, and by combining said transition indicator, said location pointers, said control codes and any data words for each information group that includes one or more control characters. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for transporting multi-word information groups containing data words and control characters over a communications link, comprising:
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a rate optimizing encoder for determining whether each of said information groups includes control characters, for each information group that does not include control characters, said rate optimizing encoder setting a data indicator and ordering said data indicator and the data words, and for each information group that includes one or more control characters, encoding the control characters to control codes, generating a transition indicator and a location pointer for each of the control codes, and ordering said transition indicator, said location pointers, said control codes and any data words;
a serializer for generating an encoded information stream by combining said data indicator and the data words for each information group that does not include any control characters, and by combining said transition indicator, said location pointers, said control codes, and any data words for each information group that includes one or more control characters;
a deserializer for extracting said data indicator and predetermined sized blocks from said encoded information stream; and
a rate optimizing decoder for determining whether said data indicator is set, when said data indicator is set, said rate optimizing decoder extracting said predetermined sized blocks of data to re-generate said information groups, and when said data indicator is not set, said rate optimizing decoder extracting said transition indicator, said location pointers, said control codes and any data words from said predetermined sized blocks, decoding said control codes to said control characters, and ordering said control characters and any data words based on said location pointers to re-generate said information groups, wherein said encoded information stream comprises a first variable length bit field for storing control code counters and said transition indicator, a second variable length bit field for storing said location pointers, a third variable length bit field for storing said control codes, and a fourth variable length bit field for storing any data words that are present.
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Specification
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Litigation Data
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Current AssigneeSycamore IP Holdings LLC
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Original AssigneeSycamore Networks Incorporated
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InventorsTsang, Danny Hin-Kwok, Azizoglu, Murat
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Primary Examiner(s)Lim, Krisna
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Application NumberUS09/794,949Publication NumberTime in Patent Office1,680 DaysField of Search370/252, 370/253, 370/231, 370/235, 709/228, 709/232, 709/236, 709/203, 709/201.3, 709/223, 709/227.9, 709/230.1, 709/243.4, 714/701, 714/707US Class Current370/252CPC Class CodesH04J 2203/0085 Support of EthernetH04J 2203/0089 Multiplexing, e.g. coding, ...H04J 3/1617 carrying packets or ATM cellsH04L 1/0002 by adapting the transmissio...H04L 25/4908 using mBnB codes
