GB906182A - Improvements in circuit arrangements for connecting an intrinsically safe telephone station to an exchange which is not intrinsically safe - Google Patents

Improvements in circuit arrangements for connecting an intrinsically safe telephone station to an exchange which is not intrinsically safe

Info

Publication number
GB906182A
GB906182A GB4211360A GB4211360A GB906182A GB 906182 A GB906182 A GB 906182A GB 4211360 A GB4211360 A GB 4211360A GB 4211360 A GB4211360 A GB 4211360A GB 906182 A GB906182 A GB 906182A
Authority
GB
United Kingdom
Prior art keywords
exchange
pulses
safe
circuit
intrinsically safe
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
GB4211360A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB906182A publication Critical patent/GB906182A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/50—Conversion between different kinds of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

906,182. Automatic exchange systems. SIEMENS & HALSKE A.G. Dec. 7, 1960 [Dec. 8, 1959], No. 42113/60. Class 40 (4). A circuit arrangement for connecting a " safe " sub-station to an " unsafe " exchange includes a transformer LU, one winding of which is connected through a first circuit to the substation St and the other winding through a second circuit to the exchange Z, wherein the first circuit includes a switch operable by calling pulses from the exchange for connecting a " safe " call generator RG to the sub-station and the second circuit includes a switch operable by dialling pulses from the sub-station for relaying the pulses to the exchange. The substation St is connected over " safe " wires a<SP>1</SP>, b<SP>1</SP> to a pulse converter U containing the transformer LU and this is connected to an automatic exchange Z over line a, b. When the subscriber lifts his hand-set contact HU make, and polarized relay IR pulls up connecting the exchange line a, b to the windings W1, W2 of transformer LU. Dialling pulses generated at contacts nsi serve to energize and de-energize relay IR and are thus repeated to the line a, b. For an incoming call, the pulses of ringing current operate relay AR which connects a "safe" ringing generator RG to the safe wires a<SP>1</SP>, b<SP>1</SP> and switches on RG at contact ar3. The generated audio-frequency pulses then operate microphone M in the usual way.
GB4211360A 1959-12-08 1960-12-07 Improvements in circuit arrangements for connecting an intrinsically safe telephone station to an exchange which is not intrinsically safe Expired GB906182A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES66161A DE1191435B (en) 1959-12-08 1959-12-08 Circuit arrangement for connecting an intrinsically safe telephone station to a non-intrinsically safe dialing center

Publications (1)

Publication Number Publication Date
GB906182A true GB906182A (en) 1962-09-19

Family

ID=7498597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4211360A Expired GB906182A (en) 1959-12-08 1960-12-07 Improvements in circuit arrangements for connecting an intrinsically safe telephone station to an exchange which is not intrinsically safe

Country Status (2)

Country Link
DE (1) DE1191435B (en)
GB (1) GB906182A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064366A (en) * 1976-01-15 1977-12-20 Winster Engineering Group Limited Intrinsically safe telephone systems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB432428A (en) * 1934-01-23 1935-07-25 Siemens Brothers & Co Ltd Improved protective arrangements for electric circuits
GB546600A (en) * 1941-01-18 1942-07-21 Automatic Telephone & Elect Improvements in or relating to telephone systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064366A (en) * 1976-01-15 1977-12-20 Winster Engineering Group Limited Intrinsically safe telephone systems

Also Published As

Publication number Publication date
DE1191435B (en) 1965-04-22

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