EP0252630A2
Expired / Lapsed
EP
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Transmission system using forward error correction
Assignee: Nortel Networks Ltd
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Filing: 1987-06-18
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Granted: —
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Expires: 2007-06-18
Abstract
Abstract In a high-speed fiber-optic tranmission system, data streams are synchronized using fixed stuffing before being multiplexed for transmission. The fixed stuffing information is replaced with forward error correction (FEC) information, whereby FEC is effected without any increase in transmission speed. FEC information blocks of each data stream can be synchronized to the frame timing of the transmission system, or they can be relatively unsynchronized. In the latter case, an FEC decoder acts in a self-framing manner to synchronize itself to the FEC information blocks of the respective data stream.
Inventors
- 👤 Wayne Davy Grover
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:19
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/04; H04L7/048; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
20 words
A method of processing information using fixed stuffing, wherein at least some stuffed information is replaced with error control information.
Claim 2
Independent Claim
20 words
A method of processing information using fixed stuffing, wherein at least some stuffed information is replaced with error control information.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 wherein the error control information comprises forward error correction information.
Claim 4
Independent Claim
44 words
A method of processing information comprising the steps of: synchronizing a data stream to an increased frequency using fixed stuffing; producing forward error correction (FEC) information from the data stream; and replacing at least some of the fixed stuffing information with the FEC information.
Claim 5
Independent Claim
44 words
A method of processing information comprising the steps of: synchronizing a data stream to an increased frequency using fixed stuffing; producing forward error correction (FEC) information from the data stream; and replacing at least some of the fixed stuffing information with the FEC information.
Claim 6
Dependent Claim
42 words
A method of transmitting information comprising the steps of: processing information in respect of a plurality of data streams by the method of claim 3; multiplexing the processed data streams together in time division multiplexed frames; and transmitting the multiplexed data streams.
Claim 7
Dependent Claim
43 words
A method as claimed in claim 4 wherein for each data stream the FEC information comprises an error control code in respect of a block of information of the data stream which is multiplexed in a plurality of said time division multiplexed frames.
Claim 8
Dependent Claim
37 words
A method as claimed in claim 5 wherein for each data stream said block of information comprises all of the information of the respective data stream contained in an integral number of said time division multiplexed frames.
Claim 9
Dependent Claim
53 words
Apparatus comprising: synchronizing means for synchronizing a data stream, the synchronizing means including means for adding fixed stuffing information to the data stream; forward error correction (FEC) means for producing FEC information from the stuffed data stream; and means for replacing at least some of the fixed stuffing information with the FEC information.
Claim 10
Dependent Claim
53 words
Apparatus comprising: synchronizing means for synchronizing a data stream, the synchronizing means including means for adding fixed stuffing information to the data stream; forward error correction (FEC) means for producing FEC information from the stuffed data stream; and means for replacing at least some of the fixed stuffing information with the FEC information.
Claim 11
Dependent Claim
85 words
Apparatus for transmitting a plurality of data streams comprising: synchronizing means for each data stream for synchronizing the data stream using fixed stuffing; means for multiplexing the synchronized data streams together for transmission in time division multiplexed frames; and, in respect of at least one of the data streams: forward error correction (FEC) means for producing FEC information from the respective synchronized data stream; and means for replacing at least some of the fixed stuffing information of the respective data stream with the FEC information.
Claim 12
Dependent Claim
85 words
Apparatus for transmitting a plurality of data streams comprising: synchronizing means for each data stream for synchronizing the data stream using fixed stuffing; means for multiplexing the synchronized data streams together for transmission in time division multiplexed frames; and, in respect of at least one of the data streams: forward error correction (FEC) means for producing FEC information from the respective synchronized data stream; and means for replacing at least some of the fixed stuffing information of the respective data stream with the FEC information.
Claim 13
Dependent Claim
42 words
Apparatus as claimed in claim 8 wherein the FEC means comprises means for producing an error control code in respect of a block of information of the respective data stream which is multiplexed in a plurality of said time division multiplexed frames.
Claim 14
Dependent Claim
27 words
Apparatus as claimed in claim 9 and including timing means for synchronizing each block of information of a respective data stream to said time division multiplexed frames.
Claim 15
Dependent Claim
130 words
Apparatus for effecting forward error correction (FEC) of a data stream including bits of error control codes periodically multiplexed therein, each error control code relating to a respective block of information of the data stream, comprising: FEC decoding means for producing error correction information from blocks of information of the data stream; correction means responsive to the error correction information to correct errors in the data stream; and control means responsive to the error correction information representing a high error rate for inhibiting the correction means and controlling the FEC decoding means to modify its timing of said blocks of information of the data stream; whereby operation of the FEC decoding means is synchronized to the blocks of information of the data stream in dependence upon the error correction information.
Claim 16
Dependent Claim
130 words
Apparatus for effecting forward error correction (FEC) of a data stream including bits of error control codes periodically multiplexed therein, each error control code relating to a respective block of information of the data stream, comprising: FEC decoding means for producing error correction information from blocks of information of the data stream; correction means responsive to the error correction information to correct errors in the data stream; and control means responsive to the error correction information representing a high error rate for inhibiting the correction means and controlling the FEC decoding means to modify its timing of said blocks of information of the data stream; whereby operation of the FEC decoding means is synchronized to the blocks of information of the data stream in dependence upon the error correction information.
References Cited (Backward Citations)
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