GB868054A - Improvements in or relating to telephone sub-sets - Google Patents

Improvements in or relating to telephone sub-sets

Info

Publication number
GB868054A
GB868054A GB2487357A GB2487357A GB868054A GB 868054 A GB868054 A GB 868054A GB 2487357 A GB2487357 A GB 2487357A GB 2487357 A GB2487357 A GB 2487357A GB 868054 A GB868054 A GB 868054A
Authority
GB
United Kingdom
Prior art keywords
receiver
controlling resistor
aug
transmitter
resistance elements
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
GB2487357A
Inventor
Anthony Crisp Beadle
Ralph William Parrish
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
Priority to GB2487357A priority Critical patent/GB868054A/en
Publication of GB868054A publication Critical patent/GB868054A/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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)

Abstract

868,054. Substation circuits. STANDARD TELEPHONES & CABLES Ltd. Aug. 1, 1958 [Aug. 2, 1957], No. 24873/57. Drawings to Specification. Class 40 (4). Non-linear resistance elements are connected in shunt across two or more of a group of circuit components consisting of the transmitter, receiver, line-balancing network, and line terminals; the voltage applied to the non- linear elements depends solely on the voltage developed across a controlling resistor which is traversed by at least part of the unidirectional transmitter-energizing current received at the line terminals. In one embodiment, the controlling resistor is provided by one winding of the induction coil. In another, the receiver is connected across a bridge circuit of which two arms include the non-linear resistance elements and the other two are formed by means of a tapping on the controlling resistor, the tapping point being chosen to give little or no direct current through the receiver. Reference has been directed by the Comptroller to Specification 694,705.
GB2487357A 1957-08-07 1957-08-07 Improvements in or relating to telephone sub-sets Expired GB868054A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2487357A GB868054A (en) 1957-08-07 1957-08-07 Improvements in or relating to telephone sub-sets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2487357A GB868054A (en) 1957-08-07 1957-08-07 Improvements in or relating to telephone sub-sets

Publications (1)

Publication Number Publication Date
GB868054A true GB868054A (en) 1961-05-17

Family

ID=10218608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2487357A Expired GB868054A (en) 1957-08-07 1957-08-07 Improvements in or relating to telephone sub-sets

Country Status (1)

Country Link
GB (1) GB868054A (en)

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