US1864381A - Circuit arrangement for sending of current impulses over telephone lines - Google Patents

Circuit arrangement for sending of current impulses over telephone lines Download PDF

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Publication number
US1864381A
US1864381A US172490A US17249027A US1864381A US 1864381 A US1864381 A US 1864381A US 172490 A US172490 A US 172490A US 17249027 A US17249027 A US 17249027A US 1864381 A US1864381 A US 1864381A
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US
United States
Prior art keywords
line
sending
relay
current
circuit
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 - Lifetime
Application number
US172490A
Other languages
English (en)
Inventor
Trechcinski Roman
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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
Priority to NL30169D priority Critical patent/NL30169C/xx
Priority to BE343824D priority patent/BE343824A/xx
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to US172490A priority patent/US1864381A/en
Priority to FR630391D priority patent/FR630391A/fr
Priority to US457358A priority patent/US1822635A/en
Priority claimed from US457358A external-priority patent/US1822635A/en
Application granted granted Critical
Publication of US1864381A publication Critical patent/US1864381A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/2607—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic comprising at least two indicating lamps

Definitions

  • the present invention relates to a connecting device, whereby the said disadvantage is removed, and which renders it possible in the desired manner to actuate an impulse relay by means of direct current impulses also over lines where, on account of the electrical properties, of thelines, the current at the receiving end is not reduced to zero at each interruption of the line circuit at the sending end.
  • Figs. '1 and 2' illustrate the cur.- rent variations at the receiving end of a line of the, type in uestion.
  • Fig. 3 serves to illustrate the mo e of action according to the invention.
  • Fig. 4 is a circuit diagram according to one embodiment of the invention as applied to a line provided with a microphone feeding bridge.
  • Fig. 5 is another embodiment of the invention in connection with a link circuit connected between the line and the receiving relay.
  • Figs. 6 and *7 are similar applications of the invention.
  • Fig. 1 shows the current variations at the receiving end of a loaded line caused by five consecutive interruptions of short duration at the sending end of the line.
  • Fig. 2 is a similar diagram show ng the current variations at the receiving end caused by ten con- PR is a polarized relay shunted through a condenser C to an ohmic resistance R included in the line branch La.
  • the relay armature 5 is so arranged as to have a tendency to-bear normally against its back contact 6, but which may be shifted into the operative position against a contact 7 by a current flowing in the direction from 8 to 9.
  • the relay PR ⁇ is brought into action by the rapid current variations caused by the current impulses in the relay circuit, but not through the absolute value of the line current nor by comparatively slow current variations, which cannot give rise to the potential difference required to shift the relay armature.
  • the position of the relay armature is dependent on the current derivative it (it When dt is positive, the armature bears on the back contact, and when i i dt is negative, it bears on the working contact.
  • Figures 4 to 7 show applications of the invention in automatic telephone systems and illustrate different ways of connecting the impulse relay to junction lines or link circuit provided with a microphone feeding bridge and, contingently, also with a speaking transformer and a blocking condenser.
  • inductances and capacities already existing in such junction lines may be used to advantage, for the purpose of providing a suitable circuit arrangement for the relay.
  • the impulse relay PR is shunted through a condenser C to an ohmic resistance R contained in the microphone feeding bridge.
  • the arrangement operates in principle in the way explained in connection with Fig. 3.
  • Fig. 5 shows the invention applied in a type of link circuit or junction line in which microphone current is supplied to the junction line onboth sides of two condensers C and C connected each in a separate line branch.
  • the impulse relay is connected be tween the two line branches behind the blocking condensers C C counted from the sending end of the line, the source of current for the microphone being connected between the two windings of the relay.
  • the link circuit to which the invention is applied comprises four resistances R R R R over which microphone current is normally supplied to the junction line on both sides of two condensers C and C connected in each one of the line branches.
  • the impulse relay PR is divided into two halves, each of which is connected up between one line branch and one pole of the microphone battery. Assuming at first that the two. resistances R and R are dispensed with,
  • each of the halves of the winding of relay PR together with one of the condensers G or C respectively and one of the resistances R or R respectively, is connected up to the line in exactly the same manner as the relay PR as a whole in Figure 3.
  • the left hand half of the winding of relay PR in series with the condenser C is obviouslyconnected in parallel with the resistance B
  • the other half of the winding is associated with the resistance R and the condenser C
  • the resistances R and R form shunts to each one of the halves of the winding PR. The unfavorable effect of these shunts is, however, practically unimportant owing to the high values of said resistances.
  • the impulse relay PR is adapted, upon being operated, to interrupt a secondary line circuit comprising the branches La Lb. ( Figures 5, 6) and La Lb ( Figure 7) re spectively, said line circuit being normally closed through the retardation coil Si, the contact 6 and the armature 5 of the relay.
  • Figure 6 illustrates a similar arrangement in which the impulse relay is connected up in the secondary circuit .of the speech transformer PR, the primary coil of which is connected up to the link circuit in the same manner as the winding of the relay PR in Figure 5, i. e. behind the blocking condensers counted from the sending end.
  • the middle point of the primary winding of the relay PR owing to the symmetry of the link circuit, is a neutral point and, that accordingly the said point may be connected with earth without changing the mode of operation of the arrangement.
  • the said primary winding may be divided into two halves which may be connected up, similarly as the halves of the winding PR in Figure 5, to each one of the poles of the battery.
  • the mode ofaction would in no Way be altered by such measures and may accordingly be said to be quite analogous with the mode of actionof the arrangement according to Figure 5.
  • Figure 7 shows a circuit arrangement analogous to that illustrated in Fig. 6 and applied to another type of trunk lines, in which the microphone feeding bridge contains the windilng of two speaking transformers Tr and I claim;
  • An arrangement for sending selecting impulses over aspeaking line including a blocking condenser in the line branches, characterized by that. the impulse relay is connected to the-line behind said condenser, counted from the sending end of the line, in
  • a speakin line means for introducing current impu ses at one end of the line, blocking condensers inserted in the line branches, and an impulse relay connected up to the line behind the blocking condensers, counted from the sending end of the line.
  • a spea in line means for introducing current impu ses at one end of the line, blocking condensers inserted in the line branches, an impulse relay, and means for connecting up said relay to the line behind the blocking condensers, counted from the sending end of the line.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Supply Of Signal Current (AREA)
US172490A 1926-04-24 1927-03-03 Circuit arrangement for sending of current impulses over telephone lines Expired - Lifetime US1864381A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL30169D NL30169C (enrdf_load_stackoverflow) 1926-04-24
BE343824D BE343824A (enrdf_load_stackoverflow) 1926-04-24
US172490A US1864381A (en) 1926-04-24 1927-03-03 Circuit arrangement for sending of current impulses over telephone lines
FR630391D FR630391A (fr) 1927-03-03 1927-03-05 Nouvelle lanterne-signal à effets d'optique
US457358A US1822635A (en) 1927-03-03 1930-05-29 Circuit arrangement for the sending of current impulses over telephone lines

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PL1864381X 1926-04-24
US172490A US1864381A (en) 1926-04-24 1927-03-03 Circuit arrangement for sending of current impulses over telephone lines
US457358A US1822635A (en) 1927-03-03 1930-05-29 Circuit arrangement for the sending of current impulses over telephone lines

Publications (1)

Publication Number Publication Date
US1864381A true US1864381A (en) 1932-06-21

Family

ID=27354042

Family Applications (1)

Application Number Title Priority Date Filing Date
US172490A Expired - Lifetime US1864381A (en) 1926-04-24 1927-03-03 Circuit arrangement for sending of current impulses over telephone lines

Country Status (3)

Country Link
US (1) US1864381A (enrdf_load_stackoverflow)
BE (1) BE343824A (enrdf_load_stackoverflow)
NL (1) NL30169C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535872A (en) * 1947-04-25 1950-12-26 American Telephone & Telegraph Signaling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535872A (en) * 1947-04-25 1950-12-26 American Telephone & Telegraph Signaling system

Also Published As

Publication number Publication date
NL30169C (enrdf_load_stackoverflow)
BE343824A (enrdf_load_stackoverflow)

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