GB1456846A - Digital telecommunications apparatus - Google Patents
Digital telecommunications apparatusInfo
- Publication number
- GB1456846A GB1456846A GB3620273A GB3620273A GB1456846A GB 1456846 A GB1456846 A GB 1456846A GB 3620273 A GB3620273 A GB 3620273A GB 3620273 A GB3620273 A GB 3620273A GB 1456846 A GB1456846 A GB 1456846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- counter
- mode
- output
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1623—Plesiochronous digital hierarchy [PDH]
- H04J3/1641—Hierarchical systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0075—Transmission of coding parameters to receiver
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
1456846 Data transmission; error detection DEFENCE SECRETARY OF STATE FOR 29 July 1974 [30 July 1973] 36202/73 Heading H4P A multiplexing system has a plurality of error detecting block codes of common length of different error correcting capabilities, those having greatest correction capability being selected inversely according to reducing number of live data ports. A data packer 1 receives signals from source 2 which are directed on to lines 4 by channel request signals 3. Encoder and multiplexer 5 is substantially similar to that disclosed in Specification 1,389,551, output from which is assembled at 8 together with " domestic " and synchronizing signals from which it is passed through a distributer 10 to a transmitter (not shown). Selection of appropriate error correcting mode is determined by a line 6 which controls input to a counter (31) (see Fig. 3, not shown) output from which is decoded at (33, 34) and provides an output on one of lines 9 which select the appropriate error correcting mode. The " domestic " signals transmitted indicates which mode is operative and this is decoded by a counter (41) at a receiver (see Fig. 4, not shown) which controls a mode determination arrangement (43). Counter 41 acts as a serial majority voting circuit. A data packer is described with reference to Fig. 2 (not shown). In the arrangement it is preferred that the encoded data signals and sync. signals should be distributed before transmission, i.e. order of information bits should be changed so that effects of burst interference will be scattered over several blocks.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3620273A GB1456846A (en) | 1973-07-30 | 1973-07-30 | Digital telecommunications apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3620273A GB1456846A (en) | 1973-07-30 | 1973-07-30 | Digital telecommunications apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1456846A true GB1456846A (en) | 1976-11-24 |
Family
ID=10385915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3620273A Expired GB1456846A (en) | 1973-07-30 | 1973-07-30 | Digital telecommunications apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1456846A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2131253A (en) * | 1982-11-24 | 1984-06-13 | Motorola Ltd | Error-correcting decoder |
GB2136248A (en) * | 1983-02-25 | 1984-09-12 | Philips Electronic Associated | Text error correction in digital data transmission systems |
US4654853A (en) * | 1983-09-26 | 1987-03-31 | Pioneer Electronic Corporation | Data transmission method |
GB2196516A (en) * | 1987-03-10 | 1988-04-27 | British Broadcasting Corp | Data transmission |
-
1973
- 1973-07-30 GB GB3620273A patent/GB1456846A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2131253A (en) * | 1982-11-24 | 1984-06-13 | Motorola Ltd | Error-correcting decoder |
GB2136248A (en) * | 1983-02-25 | 1984-09-12 | Philips Electronic Associated | Text error correction in digital data transmission systems |
US4654853A (en) * | 1983-09-26 | 1987-03-31 | Pioneer Electronic Corporation | Data transmission method |
GB2196516A (en) * | 1987-03-10 | 1988-04-27 | British Broadcasting Corp | Data transmission |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |