GB474990A - Improvements in or relating to automatic or semi-automatic telephone and like telecommunicating or signalling systems - Google Patents

Improvements in or relating to automatic or semi-automatic telephone and like telecommunicating or signalling systems

Info

Publication number
GB474990A
GB474990A GB14980/36A GB1498036A GB474990A GB 474990 A GB474990 A GB 474990A GB 14980/36 A GB14980/36 A GB 14980/36A GB 1498036 A GB1498036 A GB 1498036A GB 474990 A GB474990 A GB 474990A
Authority
GB
United Kingdom
Prior art keywords
relay
volts
automatic
circuit
subscribers
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
GB14980/36A
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.)
PANSTWOWE ZAKLADY TELE I RADJO
Original Assignee
PANSTWOWE ZAKLADY TELE I RADJO
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 PANSTWOWE ZAKLADY TELE I RADJO filed Critical PANSTWOWE ZAKLADY TELE I RADJO
Publication of GB474990A publication Critical patent/GB474990A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)

Abstract

474,990. Automatic exchange systems. FANSTWOWE ZAKLADY TELE-I RADJOTECHNICZNE. May 27, 1936, No. 14980. Convention date, May 31, 1935. [Class 40 (iv)] In a telephone or other exchange system using line finders, subscribers' lines are connected to a common start relav over rectifiers, and the relative potentials applied to the start circuit and to the feed circuit are such that when a finder switches through, current through the start relay ceases. When subscriber A1 calls, a circuit is completed from V3 (16 volts) rectifier PR, the loop, rectifier PR1, start relay U to V2 (8 volts). The finder a, b is marked, driven and stopped in a manner not shown and when switching relay PS operates, the feed circuit over relay Z is supplied from V4 (24 volts) and Vl (zero) so that the rectifiers no longer pass current. The various potentials may be obtained by tappings on the exchange battery. Current limiting resistances r1 are connected in subscribers' lines to prevent excessive potential drop across the windings of relay Z since it is necessary with the above voltage values that the potential drop from V4 to X1, for example, should not exceed 8 volts.
GB14980/36A 1935-05-31 1936-05-27 Improvements in or relating to automatic or semi-automatic telephone and like telecommunicating or signalling systems Expired GB474990A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL474990X 1935-05-31
PL672861X 1935-05-31

Publications (1)

Publication Number Publication Date
GB474990A true GB474990A (en) 1937-11-11

Family

ID=26652422

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14980/36A Expired GB474990A (en) 1935-05-31 1936-05-27 Improvements in or relating to automatic or semi-automatic telephone and like telecommunicating or signalling systems

Country Status (2)

Country Link
DE (1) DE672861C (en)
GB (1) GB474990A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL75989C (en) * 1949-01-17
BE508253A (en) * 1951-01-12
DE939455C (en) * 1954-04-02 1956-02-23 Allg Telefon Fabrik G M B H Circuit arrangement for telecommunications systems, in particular telephone systems with call seekers
DE969954C (en) * 1954-10-28 1958-08-07 Allg Telefon Fabrik G M B H Circuit arrangement for telecommunications systems with call seekers

Also Published As

Publication number Publication date
DE672861C (en) 1939-03-11

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