GB1360293A - Circuits for double-current data transmission systems - Google Patents

Circuits for double-current data transmission systems

Info

Publication number
GB1360293A
GB1360293A GB4464672A GB4464672A GB1360293A GB 1360293 A GB1360293 A GB 1360293A GB 4464672 A GB4464672 A GB 4464672A GB 4464672 A GB4464672 A GB 4464672A GB 1360293 A GB1360293 A GB 1360293A
Authority
GB
United Kingdom
Prior art keywords
voltage
input
double
interference suppression
data transmission
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
GB4464672A
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 AG
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 GB1360293A publication Critical patent/GB1360293A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0292—Arrangements specific to the receiver end
    • H04L25/0294—Provision for current-mode coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/028—Arrangements specific to the transmitter end
    • H04L25/0282—Provision for current-mode coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/08—Amplitude regulation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplifiers (AREA)

Abstract

1360293 Data transmission: interference suppression; limiters SIEMENS AG 27 Sept 1972 [29 Sept 1971] 44646/72 Headings H4P and H3T A telegraph subscriber or exchange is connected to a transmitter through an input circuit substantially as shown which provides interference suppression, overvoltage protection, and failure indication. Double current input signals on lines a b from the subscriber pass through voltage reducing resistors R1, R2, R3 to the input of a differential amplifier which provides "in-phase" interference suppression. Its output A, double-current referred to earth, may control for example a transmitter which sends one frequency for a mark and a different frequency for a space. Diodes D1 to D4 provide overvoltage protection. The voltage swing at the input terminals of the differential amplifier is limited in both positive and negative senses during normal operation to the emitter-base voltage of transistors 1, 2. Their collectors have a common bond R4 the voltage across which is monitored at S by a threshold circuit (not shown). If the voltage across R4 is greater than a predetermined value, the presence of data at the amplifier input is indicated; but if the voltage falls lower than a certain value then an open circuit fault condition is indicated.
GB4464672A 1971-09-29 1972-09-27 Circuits for double-current data transmission systems Expired GB1360293A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712148685 DE2148685A1 (en) 1971-09-29 1971-09-29 POTENTIAL INDEPENDENT LOCAL CIRCUIT INPUT CIRCUIT IN DATA TRANSFER SYSTEMS

Publications (1)

Publication Number Publication Date
GB1360293A true GB1360293A (en) 1974-07-17

Family

ID=5820962

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4464672A Expired GB1360293A (en) 1971-09-29 1972-09-27 Circuits for double-current data transmission systems

Country Status (11)

Country Link
JP (1) JPS4843509A (en)
AT (1) AT324447B (en)
BE (1) BE789509A (en)
CH (1) CH545564A (en)
DE (1) DE2148685A1 (en)
FR (1) FR2154599A1 (en)
GB (1) GB1360293A (en)
IT (1) IT967910B (en)
LU (1) LU66173A1 (en)
NL (1) NL7213091A (en)
SE (1) SE374855B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195213A (en) * 1986-08-27 1988-03-30 Sunstrand Corp Controllable limiter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806850B1 (en) * 1978-02-17 1979-03-22 Siemens Ag Receiving device for DC-free data signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195213A (en) * 1986-08-27 1988-03-30 Sunstrand Corp Controllable limiter

Also Published As

Publication number Publication date
IT967910B (en) 1974-03-11
SE374855B (en) 1975-03-17
AT324447B (en) 1975-08-25
FR2154599A1 (en) 1973-05-11
BE789509A (en) 1973-03-29
LU66173A1 (en) 1973-01-17
NL7213091A (en) 1973-04-02
CH545564A (en) 1974-01-31
DE2148685A1 (en) 1973-04-05
JPS4843509A (en) 1973-06-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees