US4755993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission system using forward error correction
Assignee: BELL TELECOM Ltd PO BOX 6123 STATION A MONTREAL QUEBEC CANADA H3C 3J5
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Filing: 1986-07-16
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Granted: 1988-07-05
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Expires: 2006-07-16
Abstract
Abstract In a high-speed fiber-optic transmission 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 D. Grover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:15
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07; H04L7/00; H04L7/04; H04L7/048
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
26 words
A method of processing information including fixed positive stuffed information, comprising the step of replacing at least some fixed positive stuffed information with error control information.
Claim 2
Independent Claim
26 words
A method of processing information including fixed positive stuffed information, comprising the step of replacing at least some fixed positive stuffed information 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
41 words
A method of processing information comprising the steps synchronizing a data stream using fixed positive stuffing; producing forward error correction (FEC) information from the data stream; and replacing at least some of the fixed positive stuffing information with the FEC information.
Claim 5
Independent Claim
41 words
A method of processing information comprising the steps synchronizing a data stream using fixed positive stuffing; producing forward error correction (FEC) information from the data stream; and replacing at least some of the fixed positive 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
55 words
Apparatus comprising: synchronizing means for synchronizing a data stream, the synchronizing means including means for adding fixed positive 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 positive stuffing information with the FEC information.
Claim 10
Dependent Claim
55 words
Apparatus comprising: synchronizing means for synchronizing a data stream, the synchronizing means including means for adding fixed positive 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 positive stuffing information with the FEC information.
Claim 11
Dependent Claim
87 words
Apparatus for transmitting a plurality of data streams comprising: synchronizing means for each data stream for synchronizing the data stream using fixed positive 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 steams; and means for replacing at least some of the fixed positive stuffing information of the respective data stream with the FEC information.
Claim 12
Dependent Claim
87 words
Apparatus for transmitting a plurality of data streams comprising: synchronizing means for each data stream for synchronizing the data stream using fixed positive 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 steams; and means for replacing at least some of the fixed positive 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.
References Cited (Backward Citations)
US3412380A
Cited
US3931473A
Cited
US4053715A
Cited
US4224473A
Cited
US4507779A
Cited
US4616361A
Cited
US4689790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |