GB824065A - Improvements in or relating to a method of and a device for eliminating spurious information in a signal transmission system - Google Patents

Improvements in or relating to a method of and a device for eliminating spurious information in a signal transmission system

Info

Publication number
GB824065A
GB824065A GB26733/57A GB2673357A GB824065A GB 824065 A GB824065 A GB 824065A GB 26733/57 A GB26733/57 A GB 26733/57A GB 2673357 A GB2673357 A GB 2673357A GB 824065 A GB824065 A GB 824065A
Authority
GB
United Kingdom
Prior art keywords
signals
systems
relays
supervisory
aug
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
GB26733/57A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB824065A publication Critical patent/GB824065A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)

Abstract

824,065. Multiplex transmission systems. TELEFONAKTIEBOLAGET L. M. ERICSSON. Aug. 23, 1957 [Aug. 23, 1956], No. 26733/57. Class 40 (4). In a multiplex transmission system arrangements are provided for eliminating spurious supervisory signals due to momentary interruptions of the main transmission path. Fig. 3 illustrates n channels obtained after demodulation and filtering of an incoming frequency division multiplex system, respective supervisory signals being received as 3825 c/s. signals over lines L1 . . . Ln which signals after detection at M1 . . . Mn operate supervisory relays R1 via their lower coils to apply positive potential to leads m1 . . . mn. In addition a group pilot signal (which may also be used for automatic gain control) is demodulated to produce over lead L a 3920 c/s. signal which is detected at M whose output kicks relay R in the released condition. In the event of a transmission failure R (which may be electronic) closes its contact rapidly to fire all tubes G1 . . . Gn whose associated relays R1 . . . Rn are at the time operated, to maintain such relays operated over their upper windings. When the transmission path is restored R operates more slowly than R1 . . . Rn to leave the latter once more under control of the 3825 c/s. signals. The invention is applicable both to systems in which the 3825 c/s. is normally present during a connection and systems in which it is normally present when no connection exists.
GB26733/57A 1956-08-23 1957-08-23 Improvements in or relating to a method of and a device for eliminating spurious information in a signal transmission system Expired GB824065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE824065X 1956-08-23

Publications (1)

Publication Number Publication Date
GB824065A true GB824065A (en) 1959-11-25

Family

ID=20349318

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26733/57A Expired GB824065A (en) 1956-08-23 1957-08-23 Improvements in or relating to a method of and a device for eliminating spurious information in a signal transmission system

Country Status (2)

Country Link
DE (1) DE1042657B (en)
GB (1) GB824065A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE636503A (en) * 1962-08-23

Also Published As

Publication number Publication date
DE1042657B (en) 1958-11-06

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