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GB296069A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB296069A
GB296069A GB24445/28A GB2444528A GB296069A GB 296069 A GB296069 A GB 296069A GB 24445/28 A GB24445/28 A GB 24445/28A GB 2444528 A GB2444528 A GB 2444528A GB 296069 A GB296069 A GB 296069A
Authority
GB
United Kingdom
Prior art keywords
busy
registers
call
register
terminals
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
GB24445/28A
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Publication of GB296069A publication Critical patent/GB296069A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

296,069. Associated Telephone & Telegraph Co., (Assignees of Stehlik, R. F.). March 14, 1927, [Convention date]. Divided on 287,079. Drawings to Specification. Semi-automatic exchange systems. - The terminals of the hunting switches that associate the incoming junctions with the idle registers of a call-indicator are connected to the registers through a distributing frame so that the number of registers can be varied while all the terminals of the hunting switches are kept in use. The position is marked busy an instant after the last but one register is taken into use, and the last, which is normally marked busy, is made available for a call arriving before the busy mark is applied. Mutilated calls are displayed after an interval governed by a timing switch which is restored as each digit is received, and are extended to a special operator, the subscriber receiving a ring- back tone. If the subscriber dials into a junction that is not associated with a register, he gets a busy signal. A common key connects up busy tone to the junction over which the number displayed has come in. The usual reply signal is not sent back if the call is abandoned. The system described is identical with that described in Specification 287,079.
GB24445/28A 1927-03-14 1928-01-12 Improvements in or relating to telephone systems Expired GB296069A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US296069XA 1927-03-14 1927-03-14
US296070XA 1927-03-14 1927-03-14

Publications (1)

Publication Number Publication Date
GB296069A true GB296069A (en) 1929-04-12

Family

ID=26705137

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24445/28A Expired GB296069A (en) 1927-03-14 1928-01-12 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB296069A (en)

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