GB1456846A - Digital telecommunications apparatus - Google Patents

Digital telecommunications apparatus

Info

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
Application number
GB3620273A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB3620273A priority Critical patent/GB1456846A/en
Publication of GB1456846A publication Critical patent/GB1456846A/en
Expired legal-status Critical Current

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

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.
GB3620273A 1973-07-30 1973-07-30 Digital telecommunications apparatus Expired GB1456846A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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