GB655774A - Improvements in or relating to telephone substation circuit - Google Patents

Improvements in or relating to telephone substation circuit

Info

Publication number
GB655774A
GB655774A GB1846948A GB1846948A GB655774A GB 655774 A GB655774 A GB 655774A GB 1846948 A GB1846948 A GB 1846948A GB 1846948 A GB1846948 A GB 1846948A GB 655774 A GB655774 A GB 655774A
Authority
GB
United Kingdom
Prior art keywords
transmitter
relating
thermistor
substation
substation circuit
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
GB1846948A
Inventor
Lyndall Crossthwaite Pocock
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB655774A publication Critical patent/GB655774A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

655,774. Substation circuits. STANDARD TELEPHONES & CABLES, Ltd. July 9, 1948, No. 18469. [Class 40 (iv)] In a substation of the anti-side-tone type comprising a transmitter 4 and a receiver 5, the energizing voltage applied to the transmitter is maintained substantially constant when the instrument is connected to lines of different characteristics by the use of a non-linear resistance 7, which may be a thermistor. Alternative circuits are shown in Figs. 2 and 4. The thermistor may be protected from damage when the transmitter branch of the circuit is opened by the provision of a path across the transmitter of large negative coefficient of resistance in relation to applied volts and instantaneous in action.
GB1846948A 1950-05-15 1948-07-09 Improvements in or relating to telephone substation circuit Expired GB655774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1204550A GB671784A (en) 1950-05-15 1950-05-15 Improvements in or relating to telephone subscriber sets

Publications (1)

Publication Number Publication Date
GB655774A true GB655774A (en) 1951-08-01

Family

ID=9997434

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1846948A Expired GB655774A (en) 1950-05-15 1948-07-09 Improvements in or relating to telephone substation circuit
GB1204550A Expired GB671784A (en) 1950-05-15 1950-05-15 Improvements in or relating to telephone subscriber sets

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1204550A Expired GB671784A (en) 1950-05-15 1950-05-15 Improvements in or relating to telephone subscriber sets

Country Status (1)

Country Link
GB (2) GB655774A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1016760B (en) * 1953-07-07 1957-10-03 Deutsche Bundespost Circuit arrangement for volume control in telephone subscriber connection lines
DE1060915B (en) * 1953-12-21 1959-07-09 Deutsche Bundespost Protection arrangement for contacts or contact-like structures in communication systems against high voltage and current surges
DE1069214B (en) * 1955-09-17 1959-11-19 Antoi., zugl Circuit arrangement for regulating the supply current for centrally supplied connection points in telecommunications systems
US3810247A (en) * 1970-09-30 1974-05-07 Iwatsu Electric Co Ltd Telephone set circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002399B (en) * 1955-12-30 1957-02-14 Siemens Ag Circuit arrangement for the automatic regulation of the back-sound absorption of telephone stations
GB1050226A (en) * 1963-11-27

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1016760B (en) * 1953-07-07 1957-10-03 Deutsche Bundespost Circuit arrangement for volume control in telephone subscriber connection lines
DE1060915B (en) * 1953-12-21 1959-07-09 Deutsche Bundespost Protection arrangement for contacts or contact-like structures in communication systems against high voltage and current surges
DE1069214B (en) * 1955-09-17 1959-11-19 Antoi., zugl Circuit arrangement for regulating the supply current for centrally supplied connection points in telecommunications systems
US3810247A (en) * 1970-09-30 1974-05-07 Iwatsu Electric Co Ltd Telephone set circuit

Also Published As

Publication number Publication date
GB671784A (en) 1952-05-07

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