US2491263A - Ringing system for voice current repeaters - Google Patents

Ringing system for voice current repeaters Download PDF

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Publication number
US2491263A
US2491263A US707100A US70710046A US2491263A US 2491263 A US2491263 A US 2491263A US 707100 A US707100 A US 707100A US 70710046 A US70710046 A US 70710046A US 2491263 A US2491263 A US 2491263A
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United States
Prior art keywords
relay
line
circuit
tube
signal
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Expired - Lifetime
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US707100A
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English (en)
Inventor
Roswell H Herrick
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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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Priority to BE477040D priority Critical patent/BE477040A/xx
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Priority to US707100A priority patent/US2491263A/en
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Publication of US2491263A publication Critical patent/US2491263A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Definitions

  • the present invention relates in general to two-way transmission systems which employ separate amplifying means for transmitting signals 12 Claims. (01.179 84) in each direction and is concerned morefparticuany with new and useful improvements in. the
  • a feature of this invention is to provide facilities in a repeater system of the 's'tandard 22- type telephone repeater. .for "transmitting ringing signals.
  • Another feature of the invention is the manner in whichv it is possible to ring, through 'on'eof the repeater channels and at the sam'e't'ime disable the complementary re eater channel thereby avoiding introduction of a singin disturbance in the complementary channel due to imperfect Iih'e balance.
  • Another ieature of the invention is the manner energized when the repeater system is removed from theline and the connection switched through .a by-pass channel'in the event of either a tube or powersupply iailure in the amplifier.
  • the channel switching feature utilized in conjunction With this ringing control circuit is closed in Roswell H. Herricks co-pend'ing application SerialNo 711,962 .filed November 23, I946.
  • a further feature of the invention is the manher in which the ringing control, circuit is con- I nected to the. amplifiers at. their "input trian'sbest be understood by reference to the following.-
  • Figure 1 shows a conventional 22 type repeater, that is, there aretwo distinct one-way amplifiers arranged for use with an ordinary two-way telephone circuit.
  • Figure 2 shows a ringing control circuit with conductors therebetween.
  • the system briefly consists of a re- ,pea tercircuit, a ringing control circuit and a re peater by-pass channel.
  • the repeater is comprised of an east and west position, an east-west channel, and west-east channel.
  • the line terminals are located at the east and west positions. When the line circuit enters the east position from the east lines, it will be connected to the line terminals at the west position either through the repeater by-pass channel or the east-west channel.
  • the line voice current entering the west position from the west line terminals will be connected to the east line terminals either through the west-east channel or the repeater bypass channel.
  • the by-pass channel is comprised of contacts I and 9,, conductors 52 and 53, and contacts 22 and 24.
  • the east-west channel consists of contacts 8 and l0, l2 and I4, repeating coil H, balancing pads l8, hybrid system l9, east-West amplifier, hybrid system 34, balancing pad 33, repeating coil 32,. contacts 2! and 29, and con tacts 23 and 25.
  • the West-east channel is comprised of, contacts 23., 25 and 21, 29,repeater coil 32,, balance pads 33 and 35, balancing network .ior the west line 36, hybrid system 34, West east amplifier, hybrid system I9, balance pads 18 and 20., balance network for east line 2
  • the ringing control circuit consists of a two section triode tube i l, resistors 49, Ill, 14, i8, 18;, condensers 13, H13, H34, relays 'l, 2, 3., 4,5, and B and. their associated contacts.
  • the contacts of relays Sand '6 are respectively 67., 69 and 68, 8. and are located in the ringing control circuit.
  • Contacts 22,. 23., 24-, 25, H and 1, 8, 9, Hi, 12 are associated respectively with relays i and 4 and are connected in the repeater circuit at the easta-nd west positions. Relays .2 and 3, likewise, have their contacts 26, 2 1, .2-8, 29, 39, 3!
  • the ringing control cir- 3 cult also includes a ring-in east path associated with a control circuit for the ring-out west, and a ring-in West path associated with a control circuit for the ring-out east.
  • the ring-in east path includes the east-west channel from the east line terminals through the secondary winding of the input transformer 3'! at which point it passes through resistor 49,
  • Relay 5 at its contacts 69 places a ground on the west repeater and thereby prevents the signal from initiating a singing disturbance within that circuit, and at its contacts 61 completes a circuit from the 115 volt source to relay 2.
  • Relay 2 operates and at its contacts 2'! and 29 breaks the line connection to the repeater channels and at its contacts 28 and 30 in the west position applies a completion of the path from a source of potential 93 through relay 5 and the lower section of tube TI.
  • the ring-out west control circuit which is utilized in combination with the ring-in east path, consists of an alternating current source of potential 96, contact 61, and relay 2.
  • the path for a ringing signal from the west position is through the west-east channel to the secondary Winding of the input transformer 80 and continues through resistor 14 conductor 63, the upper section of tube 11 and completes another path from the source of potential 93 through relay 6.
  • the associated ring-out east control circuit is composed of contact 66, conductor 65, re-
  • Relays 58 and 92 therefore, at their respective contacts 57 and 59 complete a circuit in the ringing control system from the high voltage source 99, through relays I and 4 in series, through resistor 19 in shunt of condenser 13 to ground.
  • Resistor 18 is of a predetermined value and effective in conjunction with either relays l and 4 or resistance 6! to supply the proper cathode bias to the two sections of tube l1. Relays l and 6 are therefore normally energized and at their respective contacts 23, 25 and 8, ll! connect the east and west lines to the repeater. Additionally, on
  • a condenser IE4 is placed in parallel with relay 5 to maintain the relay energized for the entire period in a normal manner.
  • feedback circuit impresses a large percentage of 20 cycle signal to the west line through contacts '23 and 25.
  • This ringing signal is likewise transmitted to a local circuit by relay 2 at its contacts 26 and 3
  • This circuit is employed in systems where the repeater system is located in the proximity of an exchange and through a predetermined code allows the operator at one exchange to contact either of the other two exchanges.
  • Signals to the local line are transmitted by the east control circuit over the by-pass line when the ringing signal is applied at contacts is and [5 for a ring east signal.
  • tube Tl again becomes non-conductive and stops the current supply to relay 5.
  • Relay 5 releases and at its contact Bl breaks the holding circuit for relay 2.
  • Relay 2 releases and at its contacts 26, 3i and 28, 3B terminates the ringing signal on the west and local lines.
  • the voice current value entering the amplifier tube 39 is controlled by the input potentiometer 38.
  • the feedback connection from the plate passes through a condenser 82 and resistor 43 to a set of resistances 44 shunted by condenser 45 and to ground. Assuming a low voice frequency is transmitted to the amplifier, the tube will amplify Being a low frequency, the
  • Voice currents initiated on the west lines will be transmitted hythe repeater through its westeast channel or toy-pass channel in-a similar manner to that signal transmitted through the eastwestchannel as .previously described.
  • the ringi-ng signal in tiated on the west conductor passes over the west-east channel to the input trans; ⁇ former of the west-east amplifier.
  • the signal then passes through resistance M, conductor 63, to resistor ⁇ it which with resistor [is effectiveas a voltage divider.
  • a voltage of predetermined value isiimpressed upon the grid of the -second section o f-tube i! as aresult of. the incoming-signal received through resistors 14 and. 18 and therebycnengizes tube 11.
  • Relay 6 energizes on 'the increased average anode currentfiow from source oi-potential 9 3 and at its contacts 66 completes a path from alternating currentsOurce-SB through relay 3 and atits contactstbplaces a ground on the east amplifier circuit.
  • Relay ⁇ energizes and atits cont-acts T3 and I5 transmits a ring signal on the east line and at its contacts T2 and Mfbreaks the line connection to the .re-
  • ihe supervisory 'Itest key 100 when operated in "the downw'ard .lpos'i'tion removes ground from the anode'ircuit of tube 39 at its conta'c'tJ-B and insert resistance 48 in the anode cathode Circuit.
  • Th-ebbj eat of "thisk'y' is't'o provide a simple ans "ec'on omlen 'reray a' 'a ifiubetes't ro'r the-ampune r.
  • the key when operated in the upward cosinen ma es asiniil-ar. test on the western- 'pl1'fie'l'.
  • Relays 1'2. and 3 accomplish. a similar method of singing :precl-usive when they insert resistances 9,1 and 98. across the repeater systems at their respective contacts ml and Hill-during the ringing periods.
  • the input signal to the ringing control circuit is received from the output connection of the amplifier transformers. In this manner the hybrid system balance is maintained and the signal potential is properly increased for use with the triode tube without thee/need of a second transformer the arrangement.
  • Terminals are located in the cathode circults of tubes 39and 82 as an aid to maintenance work and the grid; value of the amplifier tuhe may be readily. determined. by inserting a voltmeter between tenminal Fix and ground.
  • the power supply unit is operated on a 115 volt, -60 circuit and includes a .power transformer with various an "outgoing line, an -amplifier "connected therea plifier and fsaid grid,"a second resistor, a
  • What is claimediS; 1 In a transmission system, an amplifier, a incoming and an ou-tgdingll'ine connectedtheremanagi control e ircuit connected tosaidlines including a vacuum tube normally nonconduetive, an incoming signal, amplifying .means 'in said amplifier ior amplifying. said. "incoming signal, said tube, rendered conductive said amplified signal on said incoming. line, :a source of signal current, means for transmitting. an outgoing sig- "nal from said 'source over said outgoingf line, .a relay "responsive .to said tube -being rendered conductive by. said 'incoming signal "to operate said means lto transmit'said outgoing signaland to disconnect said amplifier froin .saidioutg'oing line.
  • a line circuit over which voice currents may be transmitted in either direction one amplifier responsive to voice currents from one direction having an output circuit connection to said line circuit, another amplifier responsive to voice currents from the other direction having an output connection to said line circuit, and a ringing control circuit connected to said line circuit, said control circuit including a first relay, a means operated by a signal transmitted over the line from one of said directions to energize said first relay, a source of signal current, a second relay, means controlled by said first relay for operating said second relay, means responsive to the operation of said second relay for disconnecting the output circuit of said one amplifier from said line circuit and for transmitting a signal over said line circuit from said source of signal current in said one direction, a third relay, said means also responsive to a signal transmitted over said line in said other direction to energize said third relay, a fourth relay, means controlled by said third relay for operating said fourth relay, means responsive to the operation of said fourth relay for disconnecting the output circuit of said other amplifier from said line circuit and for transmitting a signal over
  • a two way voice current repeater including a pair of amplifiers connecting said lines, a ringing control circuit connected to said repeater, including a two section vacuum tube, one section rendered conductive only on receipt of an incoming signal from one of said lines, the second section of said vacuum tube rendered conductive only on receipt of a second incoming signal from the other of said lines, a sourceof signal current, a relay operative to transmit a signal from said source over said other line independent of said amplifiers, a second relay operative to transmit a signal from said source over said one line independent of said amplifiers, a first means responsive to said first section of said tube being rendered conductive to operate said first relay, and a second means responsive to said second section of said tube being rendered conductive to operate said second relay.
  • a transmission system an incoming line and an outgoing line, a first voice current channel connected to said incoming and said outgoing line, a first amplifier in said channel having an input transformer, a second voice current channel connected to said incoming and said outgoing lines, a second amplifier in said second channel having an input transformer, a ringing circuit connected to said first channel, said second channel, said first amplifier input transformer and said second amplifier input transformer, said ringing circuit including a vacuum tube having one section comprised of a grid, an anode, and a cathode, and a second section comprised of a grid, an anode, and a cathode, a first resistor connected in series with said first amplifier input transformer and the grid of said first section of said tube, a second resistor connected between the grid of said first section of said tube and ground, said first resistor and said second resistor effective to apply a potential to said first section of said tube on receipt of a signal from said incoming line through said first channel and said first amplifier input transformer to render said first section of
  • a two way voice current repeater including a pair of amplifiers, connecting said lines, a first relay and a second relay connected in series and operative to remove said amplifiers from said line circuit, a third relay in and responsive to one of said amplifiers, a fourth relay in and responsive to the other of said amplifiers, said third and fourth relays operative to two positions, a ringing control circuit connected to said lines having a two section tube including a pair of cathodes,
  • circuit means connecting said second resistance between ground and said cathodes to maintain the grid bias of said tube constant regardless of anode current value, means responsive to the operation of said third and fourth relays to one of said positions for connecting said first and second relays to said cathodes, means responsive to the operation of said third and fourth relays to the other of said positions for disconnecting said first and second relays from said cathodes and for connecting said first resistance to said cathodes, said first resistance thereby effective to prevent possible damage to said tube when said first and second relays are disconnected from said source.
  • a bidirectional line circuit a first voice current channel having input and output terminals connected to said line, an amplifier in said channel responsive to signals from one direction, a second voice current channel having input and output terminals connected to said line, an amplifier in said second channel responsive to signals from the other direction, a ringing control circuit connected to said line circuit including a two section vacuum tube, means for rendering one section of said tube conductive on receipt of a signal from said one direction on said input terminals of said first channel, a relay controlled by said one section of said tube, a source of ringing current, a first means connected to control said output terminals of said first channel controlled by said relay for transmitting from said source a signal in said other direction over said line, means for rendering the second section of said tube conductive on receipt of a signal from said other direction on said input terminals of said second. channel, a second relay controlled by said second section of said tube, a second means connected to control said output terminals of said second channel for transmitting a signal from said source in said one direction controlled
  • a system as claimed in claim 5 in which there is an input transformer having secondary connections in said amplifier, said secondary connections being connected to said amplifier and also to said one section of said tube, thereby increasing the potential of said first incoming signal for energization of said tube and maintaining 1:,
  • a two way voice current repeater including amplifiers connecting said lines, a by-pass circuit for connecting said lines independent of said repeater, a thermionic tube in one of said amplifiers, a relay in the plate circuit of said tube responsive to a fall of current in said circuit to disconnect said repeater from said lines and connect the by-pass circuit between said lines, a ring control plifiers connecting said lines, a by-pass circuit for connecting said lines independent of said repeater, means in one of said amplifiers operative to disconnect said repeater from said lines and connect the by-pass circuit between said lines, a ring control circuit connected to said lines, a relay, a vacuum tube in said control circuit responsive to a ringing signal over one of said lines for operating said relay, a second relay operated by said first relay for disconnecting said repeater from the lines, transmitting a ringing signal over the other line, and connecting said other line to the by-pass circuit.

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  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
US707100A 1946-11-01 1946-11-01 Ringing system for voice current repeaters Expired - Lifetime US2491263A (en)

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Application Number Priority Date Filing Date Title
BE477040D BE477040A (en(2012)) 1946-11-01
US707100A US2491263A (en) 1946-11-01 1946-11-01 Ringing system for voice current repeaters

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554828A (en) * 1947-07-07 1951-05-29 Bell Telephone Labor Inc Testing repeaters in transmission systems by shunting out individual repeaters
US2644044A (en) * 1949-05-28 1953-06-30 Automatic Elect Lab Voice current repeater
US2872518A (en) * 1951-11-23 1959-02-03 Gen Dynamics Corp Party line telephone system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1697933A (en) * 1926-10-26 1929-01-08 American Telephone & Telegraph Signaling circuits for repeaters
US1829803A (en) * 1930-08-04 1931-11-03 Bell Telephone Labor Inc Telephone system
US2414795A (en) * 1945-04-30 1947-01-28 Standard Telephones Cables Ltd Ringing control arrangement for two-way carrier telephone terminals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1697933A (en) * 1926-10-26 1929-01-08 American Telephone & Telegraph Signaling circuits for repeaters
US1829803A (en) * 1930-08-04 1931-11-03 Bell Telephone Labor Inc Telephone system
US2414795A (en) * 1945-04-30 1947-01-28 Standard Telephones Cables Ltd Ringing control arrangement for two-way carrier telephone terminals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554828A (en) * 1947-07-07 1951-05-29 Bell Telephone Labor Inc Testing repeaters in transmission systems by shunting out individual repeaters
US2644044A (en) * 1949-05-28 1953-06-30 Automatic Elect Lab Voice current repeater
US2872518A (en) * 1951-11-23 1959-02-03 Gen Dynamics Corp Party line telephone system

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