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GB2331209B - A method for signalling between an analogue pulse coded modulation modem and a digital PCM modem - Google Patents

A method for signalling between an analogue pulse coded modulation modem and a digital PCM modem

Info

Publication number
GB2331209B
GB2331209B GB9817477A GB9817477A GB2331209B GB 2331209 B GB2331209 B GB 2331209B GB 9817477 A GB9817477 A GB 9817477A GB 9817477 A GB9817477 A GB 9817477A GB 2331209 B GB2331209 B GB 2331209B
Authority
GB
United Kingdom
Prior art keywords
modem
signalling
coded modulation
pulse coded
digital pcm
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 - Fee Related
Application number
GB9817477A
Other versions
GB2331209A9 (en
GB9817477D0 (en
GB2331209A (en
Inventor
Michael Joseph Mclaughlin
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.)
Fernway Ltd
Original Assignee
Fernway Ltd
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
Publication of GB2331209A9 publication Critical patent/GB2331209A9/en
Application filed by Fernway Ltd filed Critical Fernway Ltd
Publication of GB9817477D0 publication Critical patent/GB9817477D0/en
Publication of GB2331209A publication Critical patent/GB2331209A/en
Application granted granted Critical
Publication of GB2331209B publication Critical patent/GB2331209B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4927—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using levels matched to the quantisation levels of the channel

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
GB9817477A 1997-08-12 1998-08-11 A method for signalling between an analogue pulse coded modulation modem and a digital PCM modem Expired - Fee Related GB2331209B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE970593 1997-08-12

Publications (4)

Publication Number Publication Date
GB2331209A9 GB2331209A9 (en)
GB9817477D0 GB9817477D0 (en) 1998-10-07
GB2331209A GB2331209A (en) 1999-05-12
GB2331209B true GB2331209B (en) 2002-08-28

Family

ID=11041563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9817477A Expired - Fee Related GB2331209B (en) 1997-08-12 1998-08-11 A method for signalling between an analogue pulse coded modulation modem and a digital PCM modem

Country Status (2)

Country Link
GB (1) GB2331209B (en)
IE (1) IES80779B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026135A1 (en) * 1979-09-18 1981-04-01 Lignes Telegraphiques Et Telephoniques L.T.T. Method of testing a digital data transmission line between two modems and device for carrying out this method
GB2322774A (en) * 1997-02-28 1998-09-02 Fujitsu Ltd Error indicator for data modem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026135A1 (en) * 1979-09-18 1981-04-01 Lignes Telegraphiques Et Telephoniques L.T.T. Method of testing a digital data transmission line between two modems and device for carrying out this method
GB2322774A (en) * 1997-02-28 1998-09-02 Fujitsu Ltd Error indicator for data modem

Also Published As

Publication number Publication date
IES80779B2 (en) 1999-02-10
IE980666A1 (en) 1999-02-24
GB2331209A9 (en)
GB9817477D0 (en) 1998-10-07
GB2331209A (en) 1999-05-12
IES980667A2 (en) 1999-01-10

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20120920 AND 20120926

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130811