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GB2020132A - An arrangement for monitoring the performance of a digital transmission system - Google Patents

An arrangement for monitoring the performance of a digital transmission system

Info

Publication number
GB2020132A
GB2020132A GB7920836A GB7920836A GB2020132A GB 2020132 A GB2020132 A GB 2020132A GB 7920836 A GB7920836 A GB 7920836A GB 7920836 A GB7920836 A GB 7920836A GB 2020132 A GB2020132 A GB 2020132A
Authority
GB
United Kingdom
Prior art keywords
level
monitoring
performance
transmission system
digital transmission
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.)
Granted
Application number
GB7920836A
Other versions
GB2020132B (en
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of GB2020132A publication Critical patent/GB2020132A/en
Application granted granted Critical
Publication of GB2020132B publication Critical patent/GB2020132B/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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

A monitor for monitoring the performance of a digital transmission system has three level sensors 14, 15, 16 for sensing at decision instants the level of a signal derived from a transmitted signal. A first of the level sensors 14 has its threshold set at a centre decision level with respect to the eye diagram amplitude, a second 15 has its threshold set near the upper level 38, and the third 16 has its threshold set near the lower level 39. The outputs from the level sensors 14, 15, 16 are connected to logic circuitry which is arranged to energise an alarm 28 should the upper or lower eye amplitude level be between the centre, and upper or lower thresholds. <IMAGE>
GB7920836A 1978-03-17 1979-06-15 Arrangement for monitoring the performance of a digital transmission system Expired GB2020132B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1074378 1978-03-17

Publications (2)

Publication Number Publication Date
GB2020132A true GB2020132A (en) 1979-11-07
GB2020132B GB2020132B (en) 1982-06-03

Family

ID=9973467

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7920836A Expired GB2020132B (en) 1978-03-17 1979-06-15 Arrangement for monitoring the performance of a digital transmission system

Country Status (1)

Country Link
GB (1) GB2020132B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082575A1 (en) * 1981-12-21 1983-06-29 Motorola, Inc. An energy-synchronised demodulator circuit
EP0066624A4 (en) * 1980-12-22 1983-07-04 Motorola Inc Tone detector circuit.
EP0328266A2 (en) * 1988-02-12 1989-08-16 Nortel Networks Corporation Binary data regenerator with adaptive threshold level
FR2669794A1 (en) * 1990-11-21 1992-05-29 Motorola Inc ERROR DETECTION SYSTEM.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066624A4 (en) * 1980-12-22 1983-07-04 Motorola Inc Tone detector circuit.
EP0082575A1 (en) * 1981-12-21 1983-06-29 Motorola, Inc. An energy-synchronised demodulator circuit
US4458206A (en) * 1981-12-21 1984-07-03 Motorola, Inc. Circuit for synchronizing the demodulation of phase modulated transmission bursts
EP0328266A2 (en) * 1988-02-12 1989-08-16 Nortel Networks Corporation Binary data regenerator with adaptive threshold level
EP0328266A3 (en) * 1988-02-12 1990-11-22 Northern Telecom Limited Binary data regenerator with adaptive threshold level
FR2669794A1 (en) * 1990-11-21 1992-05-29 Motorola Inc ERROR DETECTION SYSTEM.

Also Published As

Publication number Publication date
GB2020132B (en) 1982-06-03

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950615