DK332380A - CONNECTION TO CONNECTING TRANSFER DEVICE IN A MODEM TO A PHONE LINE - Google Patents

CONNECTION TO CONNECTING TRANSFER DEVICE IN A MODEM TO A PHONE LINE

Info

Publication number
DK332380A
DK332380A DK332380A DK332380A DK332380A DK 332380 A DK332380 A DK 332380A DK 332380 A DK332380 A DK 332380A DK 332380 A DK332380 A DK 332380A DK 332380 A DK332380 A DK 332380A
Authority
DK
Denmark
Prior art keywords
telephone line
modem
connection
transmission device
data signals
Prior art date
Application number
DK332380A
Other languages
Danish (da)
Inventor
H Sailer
T Vogeler
Original Assignee
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 Ag filed Critical Siemens Ag
Publication of DK332380A publication Critical patent/DK332380A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Function (AREA)
  • Communication Control (AREA)
  • Communication Cables (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

1. Circuit arrangement for connecting a transmission device (UB) of a modem to a telephone line (FL), wherein the transmission device (UB) generates or receives, as the case may be, data signals (D) assigned to the data to be transmitted and received, and wherein the operating voltage (UV) of the modem is produced from the loop current of the telephone line (FL) using a regulating stage (R), and wherein dialling pulses are produced by means of interruptions of the telephone line (FL) via a switch (nsi), characterised in that there is provided a frequency separating filter (F) which on the one hand is connected to the telephone line (FL) and on the other hand to the regulating stage (R) and to the transmission unit (UB) and which establishes a connection between the telephone line (FL) and the transmission device (UB) that is D.C. isolated and permeable to the data signals (D), and which frequency separating filter establishes a D.C. connection between the telephone line (FL) and the regulating stage (R) which is permeable to the dialling pulses and blocks the data signals (D).
DK332380A 1979-08-02 1980-08-01 CONNECTION TO CONNECTING TRANSFER DEVICE IN A MODEM TO A PHONE LINE DK332380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2931464A DE2931464C2 (en) 1979-08-02 1979-08-02 Circuit arrangement for connecting a transmission device of a modem to a telephone line

Publications (1)

Publication Number Publication Date
DK332380A true DK332380A (en) 1981-02-03

Family

ID=6077507

Family Applications (1)

Application Number Title Priority Date Filing Date
DK332380A DK332380A (en) 1979-08-02 1980-08-01 CONNECTION TO CONNECTING TRANSFER DEVICE IN A MODEM TO A PHONE LINE

Country Status (9)

Country Link
EP (1) EP0023692B1 (en)
AT (1) ATE4015T1 (en)
DE (1) DE2931464C2 (en)
DK (1) DK332380A (en)
ES (1) ES493899A0 (en)
FI (1) FI802427A (en)
NO (1) NO147579C (en)
PT (1) PT71639B (en)
YU (1) YU194780A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122843B (en) * 1982-03-30 1985-10-30 Guestel Limited Telephone interface unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472442A (en) * 1974-07-30 1977-05-04 Standard Telephones Cables Ltd Power supply circuits
DE2814837C2 (en) * 1978-04-06 1980-01-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Data modem, in particular for teletext operation

Also Published As

Publication number Publication date
DE2931464B1 (en) 1981-01-22
EP0023692A1 (en) 1981-02-11
PT71639B (en) 1981-06-26
ES8104693A1 (en) 1981-04-01
DE2931464C2 (en) 1981-10-08
NO802248L (en) 1981-02-03
PT71639A (en) 1980-09-01
ATE4015T1 (en) 1983-07-15
EP0023692B1 (en) 1983-06-29
FI802427A (en) 1981-02-03
YU194780A (en) 1982-10-31
NO147579C (en) 1983-05-04
ES493899A0 (en) 1981-04-01
NO147579B (en) 1983-01-24

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Legal Events

Date Code Title Description
ATS Application withdrawn