US2307818A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2307818A
US2307818A US398006A US39800641A US2307818A US 2307818 A US2307818 A US 2307818A US 398006 A US398006 A US 398006A US 39800641 A US39800641 A US 39800641A US 2307818 A US2307818 A US 2307818A
Authority
US
United States
Prior art keywords
relay
line
impulse
winding
current
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
US398006A
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English (en)
Inventor
Beale Charles Edmund
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of US2307818A publication Critical patent/US2307818A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference

Definitions

  • the present invention relates to telephone sys-.
  • the incoming and outgoingsides are usually separated by line condensers, on the incoming side of which a battery feeding bridge is provided, while on the other side a supervision bridge is provided.
  • the former bridge comprises a battery feeding impulse responding relay, a make contact of which is included in the outgoing side of the circuit to enable impulse repetition to be performed.
  • the chief object of the present invention is to provide an improved repeater of the type described in which difficulties tending to produce impulse distortion are overcome in a particularly simple manner.
  • ballast lamp connections are short-circuited.
  • this is done by contacts of a slow releasing relay which is held operated while each incoming train of impulses is being received and which is released after each train to restore the normal connections of the battery feeding relay on to line for conversation conditions.
  • the negative and positive conductors on the right-hand side of the drawing connect withthe lon line extending to the subscribers station, while the negative and positive conductors on the left-hand side of the drawing terminate in a'jack on the P. B. X board.
  • the high impedance battery feeding impulse repeating relay A is operated over earth, lower winding of relay A, lower resistance element of the ballast lamp BRA, rectifier MRB, lower right-hand winding of the repeating coil RPC, conductor, calling subscribers loop, conductor, upper right-hand winding of repeatin coil RPC, rectifier MRA, upper resistance element of the ballast lamp BRA, upper winding of relay A, battery, and earth.
  • relay A at armatur a! brings u the slow-to-release relay B.
  • dial tone is returned to the calling subscriber, this tone extending through the equipment shown via the inductive coupling of the windings of the repeating coil, and the subscriber now proceeds to dial the required number.
  • Relay A responds to the first. train of'impulses received from the subscribers dial, and at armature a2 repeats those impulses to the main exchange. It will be noted that in order to reduce the period during which any surges which may result in the distortion of this first break period may be extended to line, armature a2'is.of the make-before-break type. and hence as soon" as relay A commences to release, the pubnc exchange side of the repeating coil is short-circuited over the partially released armature a? and operated armature bl. On the first release of relay A, an obvious circuit is closed for relay C, over contacts al and b3 and the two windings of relay C in series. Relay C operates a very short interval later and; at armature cl short v eircuitsthe back contact c2 thereby to maintain,
  • relayA remainsheld over the callingsubscribers lqop,.and at contact al maintains relay B. Due to the opening of the 1 a resultof each subsequent impulse train and on the completion of dialling, relay A is maintained connected to line via the'ballast lamp BRA and vIi the right-hand windings of the repeating coil.
  • Conversation may now proceed between the callingand called parties.
  • the P. B. Xoperator wishes to effect a call to the distant subscriber, she connects ringing current to the incomingleft-hand negative and positive conductors and, since all relays in the auxiliary equipment shown willbe normal, this currentextends from' the negative line over armatures bl and ai; upper left hand winding of the repeating coil, comparatively low resistance YA, condenser QA, lower .left hand winding of the repeating coil back to the positive line.
  • a similar current isthereupon induced in the righthand windings of the repeating coil and extends over the external line to ring the distant subscribers bell.
  • the efiect is similar if an incoming call is received at a time when thesubscribers line is connected through to the main exchange.
  • both rectifiers offer a low resistance path to the particular flow of denser QC and resistance :YBfwhichare conn w a r he. i llleef eet ns a a u c2 of relay A are provided for spark'quenching and inductive voltage reducing purposes.
  • a ba lastresistor havin a nonl near resistance characteristic, an impulse, re-
  • an impulse repeater an incoming line, an outgoing line, a ballast resistor having a non linear resistance characteristic, an impulse receiving relay, a source of direct current connected to said line over said resistor and the winding of said relay in series, thereby to cause current from said source to traverse said line, said relay responsive to interruptions in the flow of said current, a contact on said relay effective to repeat said interruptions in said outgoing circuit, and means for connecting said source to said incoming line over the winding of relay but independently of said resistor during the response of said relay to such interruptions.
  • an impulse repeater an incoming line, an outgoing line, a ballast resistor having a nonlinear resistance characteristic, an impulse receiving relay, a source of direct current connected to said line over said resistor and the winding of said relay in series, thereby to cause current from said source to traverse said line, said relay responsive to interruptions in the flow of said current, a contact on said relay effective to repeat said interruptions in said outgoing circuit, a slowto-release relay, means controlled by said impulse receiving relay for operating said slow-torelease relay responsive to the first interruption of a series of interruptions and maintaining said slow-to-release relay operated throughout said series, and contacts on said slow-to-release for shirt-circuiting said ballast resistor so long as said slow-to-release relay remains operated.
  • a repeating coil having a primary winding and a secondary winding, two condensers, an incoming line and an outgoing line, means connecting said primary widing and one of said condensers in series across said incoming line, means connecting said secondary winding and the other of said condensers in series across said outgoing line, a ballast resistor, an impulse receiving relay, a source of direct current connected to said incoming line over said resistor and the winding of said relay in series, thereby to cause current from said source to traverse said primary line, said relay responsive to interruptions of said current, a contact on said relay connected in said outgoing line and effective to repeat said interruptions therein, and
  • a repeating coil having a primary winding and a secondary winding, two condensers, an incoming line and on outgoing line, means connecting said primary winding and one of said condensers in series across said incoming line, means connecting said secondary winding and the other of said condenser in series across said outgoing line, a ballast resistor, an impulse receiving relay, a source of direct current connected to said incoming line over said resistor and the winding of said relay in series, thereby to cause current from said source to traverse said private line, said relay responsive to interruptions of said current, a contact on said relay connected in said outgoing line and effective to repeat said interruptions therein, a second relay, means controlled by said first relay for operating said second relay responsive to the first interruption of a train of interruptions and for maintaining said second relay operated throughout said train, and contacts on said second relay effective, so long as said second relay remains operated, to short circuit said ballast resistor and to short circuit said secondary winding.
  • a line a ballast resistor having a non-linear resistance characteristic
  • an impulse receiving relay a source of direct current normally connected to said line over said resistor and the winding of said relay in series, thereby to cause current from said source to traverse said line
  • said relay responsive to impulses in the form of interruptions of said current, and means for connecting said source to said lines over the winding of said relay but independently of said resistor during the response of said relay to said impulses.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US398006A 1940-08-06 1941-06-14 Telephone system Expired - Lifetime US2307818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12629/40A GB543065A (en) 1940-08-06 1940-08-06 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
US2307818A true US2307818A (en) 1943-01-12

Family

ID=10008213

Family Applications (1)

Application Number Title Priority Date Filing Date
US398006A Expired - Lifetime US2307818A (en) 1940-08-06 1941-06-14 Telephone system

Country Status (4)

Country Link
US (1) US2307818A (enrdf_load_stackoverflow)
BE (1) BE468834A (enrdf_load_stackoverflow)
FR (1) FR934998A (enrdf_load_stackoverflow)
GB (1) GB543065A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563311A (en) * 1944-06-02 1951-08-07 Comp Generale Electricite Antidistortion device for receiving and retransmitting impulses
US2596025A (en) * 1948-01-03 1952-05-06 Ericsson Telefon Ab L M Signaling over telephone lines by means of a nonlinear resistance
US2607854A (en) * 1947-07-22 1952-08-19 Automatic Elect Lab Automatic toll telephone system
US3003040A (en) * 1956-01-25 1961-10-03 Gen Dynamics Corp Modified trunk circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563311A (en) * 1944-06-02 1951-08-07 Comp Generale Electricite Antidistortion device for receiving and retransmitting impulses
US2607854A (en) * 1947-07-22 1952-08-19 Automatic Elect Lab Automatic toll telephone system
US2596025A (en) * 1948-01-03 1952-05-06 Ericsson Telefon Ab L M Signaling over telephone lines by means of a nonlinear resistance
US3003040A (en) * 1956-01-25 1961-10-03 Gen Dynamics Corp Modified trunk circuit

Also Published As

Publication number Publication date
FR934998A (fr) 1948-06-07
BE468834A (enrdf_load_stackoverflow)
GB543065A (en) 1942-02-09

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