US2419540A - Telecommunication switching system - Google Patents

Telecommunication switching system Download PDF

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Publication number
US2419540A
US2419540A US500411A US50041143A US2419540A US 2419540 A US2419540 A US 2419540A US 500411 A US500411 A US 500411A US 50041143 A US50041143 A US 50041143A US 2419540 A US2419540 A US 2419540A
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United States
Prior art keywords
selector
terminals
register
potentials
brush
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
US500411A
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English (en)
Inventor
Deakin Gerald
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to US500411A priority Critical patent/US2419540A/en
Application granted granted Critical
Publication of US2419540A publication Critical patent/US2419540A/en
Priority to NL133231A priority patent/NL65602C/xx
Priority to DEI3000A priority patent/DE872221C/de
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • This invention relates to new vand useful improvements in telecommunication switching systems and more particularly to selector control circuits for such systems.
  • the Vobject of the invention is accurately and rapidly to vcontrol a switch in the performance of a selective operation, e. g. the seizure of a line.
  • Such double test may be made, for instance, by two electromagnetic test relays, first over one brush and then over a second brush of the selector.
  • twin test relays are always tested for a fixed condition. While the arrangement is effective against double connections, it does not yaiford protection yagainstoversteps which may result in wrong or double connections.
  • the gas valve rst tests twice, preferably first over one 'and then overa second brush of the selector switch.
  • the second test is always made for the same potentials as the first test so as to prevent seizure of the selected terminals and stop the progress of the connection if the second test does not iind the same condition as the ⁇ iirst test. Should the selector overstep to a free trunk to which-the same potential is applied yas to the previous trunk, then that trunk will be seized and the connection will'proceed in the usual way. Should, however, the overstep be to a Vfree trunk having -a diierent potential, Aor to a busy trunk or to the space between two terminals, then establishment of the connection will be discontinued.
  • a register switch ED of which only one terminal bank is shown advances from-position 1 to position 2 when dialing commences and in so doing will cause a relay RSR'in the register to operate.
  • This will connect ground at the armature of relay GVR over the'back contact of this relay and the right-hand armature and front contact of RSR to the a wire connected over the first kgroup selector to the A talking brush of lthesecondgroup selector.
  • Relay AR in the second selector ' is connected with this wire over the normally closed contact ONCE.
  • the relay becomes energized and locks up over its 'left-hand front contact andar.- mature 3, and connects clutch magnet P 'of the selector over its armature 4 and front contact in parallel 'with its own locking circuit.
  • the relay BR was energized and locked vup immediately upon the seizure of the second group selector by the rst group selector over a circuit including the armature 4 and iront contact of the BR relay associated with the rst selector (which is like the second selector) resistance IR2 in the second selector, the c wire and ONCZ.
  • a slow releasing relay RSR2 in the register which was energized by RSR connects the b wire to the cathode of a triode VI and the grid of a triode V2. This slight delay is introduced to prevent a premature and false second test to the test potential N which would occur if relay AR in the selector failed to break the back Contact of armature I before RSR2 in the register 2 made its front contact.
  • the operating circuit of GVR may be traced from a source of potential -N in the third group selector (identical with the first and second selectors), a resistance IRT, the ONC! contact of the third group selector, the armature I and back contact of the BR relay of this selector. terminal and test brush T of the second selector. front contact and armature 2 of BR. front contact and armature I of AR. the b wire, armature and front contact RSRZ, the control electrode CEI and main gap electrode MG of gas valve GV. winding of GVR. the back contact and armature of a relay GSR to high tension battery. The instant GV fires. the potential applied to the T brush and, therefore, to the multiple test terminals with which it is in engagement.
  • GVR removes ground from the a wire and deenergizes RSR, AR and the clutch magnet P.
  • AR opens its locking circuit, disconnects the b wire from the T brush. This wire is now connected only to the B brush. However, before the T brush is disconnected from the b Wire, it is connected over the armature 2 and front contact of relay BR, armature 2 and back contact of relay AR to the t wire and therethrough to a ground at the rst group selector. Thus the busy guard on the 'I' terminal is not broken during the transfer.
  • GVR will cause the energization of GSR which opens the high tension battery connection long enough to de-ionize gas valve GV and to release GVR.
  • This relay will open the circuit of GSR, but before the latter opens its front contact it will cause the energization of a slow releasing relay GRR by ground applied over the back contact of GVR.
  • GRR locks up over the front contact of RSR2 which did not have time to de-energize during the brief operation of RSR.
  • the potential applied to the b wire will be the same as of the talking circuit at that point. If the talking circuit is open, then the potential will be 48 volts. If it is closed through. a low resistanceline and a sub-station set of 50 ohms, then the potential will be -26 volts. This potential is not used for .trunk selection and thus the second selector will release without disturbing theblusy connection.
  • each selector for controlling the seizure of a terminal set by the selector and controlled by the testing means only if the same potentials are successively applied over both terminals.
  • a plurality of lines means including a group of selector switches for establishing a talking connection between a calling and a called line, a register controlled in accordance with the designation of the called line for controlling a selector to establish the connection, each of said selectors having a bank of multiple terminals and a set of brushes cooperating therewith, sources of diierent potentials indicating the busy or idle condition of the terminals, testing means associated with the register for testing the condition of each set of terminals, means for connecting said testing means twice in succession with the brushes of the selector under control, and electromagnetic means in each selector controlled by the testing means to seize a set of terminals only if the same potentials are successively applied over the brushes to the testing means.
  • a plurality of lines means including a group of selector switches for establishing -a talking connection between a calling and a called line, a register controlled in accordance with the designation of the called line for controlling a selector to establish the connection, each of said selectors having a bank of multiple terminals and a set of talking and test brushes cooperating therewith, sources of different potentials indicating the positions of the terminals in the banks, contacts for connecting said potentials normally with a test terminal and when the set of terminals is seized with a terminal cooperating with a talking brush, testing means associated with the register for testing the location and the busy condition of each set of terminals, rst over the test brush and then over -a talking brush of the selector taken into use, and electromagnetic means in each selector controlled by the testing means to seize a set of terminals only if the same potentials are successively applied over both terminals.
  • a plurality of lines means including groups of selector switches for establishing a talkin-g connection between a calling and a called line, a register controlled in accordance with the designation of the called line for successively controlling a selector in each group to establish the connection, each of said selectors having a bank of multiple terminals and a set of talking and test brushes cooperating therewith, sources of different D.
  • CL potentials indicating the positions of the terminals in the banks, contacts in each selector for connecting said potentials normally with a test terminal and when seized with a talking terminal in the preceding multiple bank over which the selector may be seized, testing means associated with the register for testing the location and the busy condition of each set of terminals, rst over the test brush and then over a talking brush of the selector taken into use, and electromagnetic means in each selector controlled by testing means to control the seizure of a set of terminals only if the same potentials are suc- K magnet for controlling the seizure by the brushes of a set of terminals, sources of diierent potentials, connections for applying different potentials to the terminals of a set, a variably operable register for controlling the selector magnet and arranged to select a potential designating the location of a desired terminal, a multi-electrode discharge device, connections from the electrodes of said device to the register and to the selector brushes, means for closing twice in succession the connection between the device and the selector brushes,
  • a selector having a bank of terminal sets and a set of cooperating brushes, a magnet for controlling the setting of the brushes on a set oi terminals, sources of different poten tials, connections for applying different potentials to the terminals cooperating with two brushes, said potentials designating the positions of said terminals in the bank and the busy and idle condition thereof, a v-ariably operable register for controlling the selector magnet and arranged to select a potential designating the location of a desired terminal, a multi-electrode discharge device, connections fromv the electrodesA of said device to the register and to said one of the brushes, a contact in the selector for extending the connection from the discharge device to another brush and a circuit for said magnet controlled by said discharge device depending on the relationship ofthe potenti-als applied to the connections.
  • a selector having a bank of terminal sets and a set of cooperating brushes, a magnet in the selector for controlling the seizing by the brushes of a set of terminals, sources of different D. C. potentials, connections for applying different potentials to the terminals, said potentials designating the positions of said terminals in the bank and the busy and idle condition thereof, a variably operable register for controlling the selector magnet, said register including a variably operable switching device arranged to select a potential designating the location of a desired terminal set, said register also including a gas valve, having control and main gap electrodes, and a multi-electrode discharge device, connections from the electrodes of said device to the register switch and to one of the brushes, contacts in the selector for twice completing the connection from the discharge device to the brushes, a connection from a control electrode of the gas valve to the last-mentioned connection, said discharge device and gas valve being so adjusted that the latter strikes only when the potentials applied to both connections of the discharge device bear a predetermined relationship to
  • a selector having a bank of terminal sets and a set of cooperating brushes, a magnet in the selector for controlling the setting of the brushes on a set of terminals, sources of different D. C. potentials, connections for applying different potentials to the terminals cooperating with two brushes, said potentials des- -plioation.
  • a switch having a first and aplurality of second sets of cooperating contacts, a-source of potentials, means'for applying a potential to a contact in each second set, testing ⁇ means responsive to the potential so applied, a circuit for connecting the testing means to one contact of the rst set and therethrough to the contact of the second set cooperating therewith and electronic means for instantaneously altering the potential applied tothe contact of said second set to prevent the seizure thereof.
  • a register a selector controlled thereby and having a bank of multiple terminals and a set o'brushes cooperating therewith, a source of potentials, means for applying a potential to said terminals to indicate the condition thereof, electronic testing means responsive to a predetermined potential connected to trolled thereby and having a bank of multiple terminals and a set of brushes cooperating therewith, a source of potentials, contacts for applying a potential to a set of terminals to indicate the condition thereof, a gas valve responsive to sa'id potentials, a circuit for connecting the valve to said brushes and therethrough to the set of terminals engaged thereby, a circuit for saidgas valve to ionize it only when a predetermined potential exists on the set of terminals with which it is connected, and a source of potential connected over the gas valve to the terminals engaged by the brushes for altering the potential existing on the terminals upon the ionization of the gas valve.
  • a register a selector controlled thereby and having a bank of multiple terminals and a set of brushes cooperating therewith, .a source ofrpotentials, contacts for applying potential to a set of terminals to indicate the condition thereof, an electronic switch responsive to said potentials, a circuit for connecting the electronic switch to said brushes and therethrough to the set of terminals engaged thereby, said switch being adj-usted to operate only when a predetermined potential exists on the terminals with which it is connected, and a circuit for altering the potential existing on a terminal controlled by said electronic switch.
  • a selector switch having a test brush and a plurality of multiple test terminals, a source of potentials, means for applying predetermined potential to said test terminals to indicate the condition thereof, a magnet for controlling the movement of said test brush over said test terminals, a relay for controlling the operation of said Amagnet to arrest said brush when it engages a terminal on .which a predetermined potential exists, and anelectronic switch controlling said relay 'fand .I altering 'the potential existing ⁇ on 'the test terminal torprevent its seizure.
  • a group of -selector switches each having a test brush and a plurality ofmultiple test terminals, a source of potentials, means for applying .predetermined potentials to said test terminals, depending on the idle or busy condition thereof, a magnet for controlling the movement of said test brush over said test terminals, means for controlling the operation 0i said magnet to arrest brush when it engages an idle test terminal, and -anelectronic switch for applying a different predetermined ⁇ busy potential to said test brush when its arrest .is initiated by the actuation of said last-mentioned means.
  • a iirst switch having two sets of contact-s, and-means for causing the contacts to ⁇ cooperate, for performinga predetermined switchingoperation, a source of potentials arranged to be connected to one set of contacts, testing means responsive to said potentials, means for connecting the testing means twice in succession to the second set of contacts, and means controlled by the testing means lfor allowing said contacts to perform said switching operation only if the potentials which are successively applied bear a predetermined relationship to one another.
  • a register a selector controlled thereby and having a bank'of multiple terminals and a set of brushes cooperating therewith, a source of potentials arranged to be connected to sa-idterminals, anelectronic switch responsive to said potentials, means for connecting tbeelectronic switch-twice in succession to said brushes, and 'means controlled by the electronic switch for seizing a set of terminals only if the potentials successively applied thereto 'bear a predetermined relationship to one another.
  • a register a selector controlled thereby and having a bank of multiple terminals Vand a set of brushes cooperating therewith, a source of potentials arranged to be connected to said terminals, a gas valve responsive to said potentials, means for operatively connecting the valve twice in succession to said brushes, and means controlled by the valve for seizing a set of terminals only if the same potentials Vare successively applied thereto.
  • a selector a register for controlling the selector, said selector having a bank of multiple terminals and a set of brushes cooperating therewith, sources of potentials indicating'the busy and ⁇ idle condition of the terminals, contacts for connecting said potentials normally with'one and when seized with another terminal in a set, testing means associated with the register for testing the condition'of each set otterminals, first over the brush cooperating with said one-and-then over said another'terminal, and means in said selector controlled by the testing means to 'seize a setof Iterminals only if the ⁇ same potentials are successively applied over both terminals.
  • a. 'group of selectors Aa register rior controlling a selector, ⁇ said selector having a bank of multipleterminal sets and a set of. brus-hescooperating therewith, sources of different potentials indicating the'positions of Athe terminals in the banks, contacts for connecting said potentials normally with one-and when seized with anotherterminal in a set, testing means associated Withthe register for'testing 'thelocaignating-t-he positions of said terminals in the bank andthebusy and idle condition thereof, av
  • variably operable register yfor controlling the selector magnet said-register including a variably operable switching device-i arranged toselect a potential designating the locationof a desired terminal, said registerfalso including a gas-valve,
  • r means including av selector switch forY establishing-a talking connectionbetweenl a callingfV and' a called line, said selector switchy having a bank-or terminal sets and a set of cooperating brushes, including a rst and a second talking brush and a test brush, a magnet in the selector fo'r controlling Ythe seizure by the brushes of a set of terminals, sourcesof diierent D.
  • operable switching device arranged to select a potential designating the locationcf a desired terminal, said register also including a gas valve, having control and main gapelectrod'es, and a multi-electrode discharge device, connections from the electrodes of said f device to the register switch and to said one of the talking brushes of the selector switch, a relay inthe-seicctor for extending the-connection from the discharge device to the test brush, a connection from a control electrode of the gas valve to the last-mentioned connection, said discharge device and gas Valve being so adjusted that the latter strikes only when the same potentials are applied to both connections of the discharge device and an idle potential is applied to the control electrode of the gas valve, and a circuit for said magnet controlled by said gas valve.
  • a plurality of lines means including one of a group of selector switches for establishing a talking connection between a calling and a called line, each of said selector switches having a multipled bank of terminal sets and a set of cooperating brushes, including a iirst and second talking brush and a test brush, a magnet in' each selector for controlling the seizure by the brushes of a set of terminals, sources of different D.
  • a register variably operable in accordance with the designation of the called line for controlling the magnet of the selector taken into use, said register including a variably operable switching devicezarrangedto select a potentialidesignating the location of a desired terminal', said register also including a gas valve, having two* control and main gap-electrodes, and twotriodes, a iirst connection fromA the-gridvofl the rst and the cathodeof the-second triode to the register switch, asecond connection from thecathode of therst and the grid of the secondtriode'tosaid one-oi thek talking brushes ofv the-selector inuse, ali-clay ⁇ in-said selector for extendings the second connection yto the test brush, a connection fromY a control electrode of the gas Valve
  • a pluralityof lines means including one-of a group ofA selectors for interconnecting calling ⁇ and called lines, each ofsaid selectors having a-multipled bank of termi-Y nal sets and a set of ⁇ brushes cooperating therewith, includingV a first and a second talking con-A ductor brush and a test brush, a magnet and a relay vfor each selector for controlling the seizure by the brushes of a set of terminals, conductorsI terminals and abrush cooperating therewith,V connections-for applying totheterminals ofthe regi-ster switch potentials corresponding tothosedesignating locations of selector terminals, a
  • a variablyoperable register for controlling the setting of the brushes of a selector taken into use, sources of different D. C. potentials, means including said relays to apply said potentials normally to the terminals cooperating with the test brush and when the selector is taken into use to the terminal cooperating with the second talking brushes, said potentials designating the location and the idle and busy condition of the sets of terminals, said ⁇ register comprising a switchvhaving a row of terminals and a brush cooperating therewith7 connections for applying to the terminals of the register switch potentials corresponding tothose designating locations of selector terminals, a first, a second, a third, a fourth and a fth relay in the register, the second and third relays being slow to release, a high tension source in said register, two triodes and a gas Valve in said register, said gas valve having two control electrodes and a main gap electrode, a connection from the high tension source over a back contact of the fourth relay to the anodes of the triodes and a control electrode of the

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Fuses (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US500411A 1943-08-28 1943-08-28 Telecommunication switching system Expired - Lifetime US2419540A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US500411A US2419540A (en) 1943-08-28 1943-08-28 Telecommunication switching system
NL133231A NL65602C (enrdf_load_stackoverflow) 1943-08-28 1947-07-03
DEI3000A DE872221C (de) 1943-08-28 1950-09-30 Elektrische Steuereinrichtung

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Application Number Priority Date Filing Date Title
US500411A US2419540A (en) 1943-08-28 1943-08-28 Telecommunication switching system

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US2419540A true US2419540A (en) 1947-04-29

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US500411A Expired - Lifetime US2419540A (en) 1943-08-28 1943-08-28 Telecommunication switching system

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US (1) US2419540A (enrdf_load_stackoverflow)
DE (1) DE872221C (enrdf_load_stackoverflow)
NL (1) NL65602C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557638A (en) * 1947-01-07 1951-06-19 Int Standard Electric Corp Telecommunication system
US2570214A (en) * 1946-09-14 1951-10-09 Int Standard Electric Corp Second test circuit for selector wipers
US2598822A (en) * 1945-10-13 1952-06-03 Roelof M M Oberman Signaling system with private branch exchange subscriber
US2640883A (en) * 1948-09-11 1953-06-02 Hartford Nat Bank & Trust Co Marker control arrangement for selectors
US2688659A (en) * 1949-10-31 1954-09-07 Hartford Nat Bank & Trust Co Circuit-arrangement for use in automatic signaling systems for numerical adjustment of a switch by a selective marking method
US2697752A (en) * 1950-10-12 1954-12-21 Hartford Nat Bank & Trust Co Device for testing characterizing impedances
US2787657A (en) * 1948-04-01 1957-04-02 Int Standard Electric Corp Telegraph repeaters

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841254A (en) * 1927-07-20 1932-01-12 Rudolph R Rosenbaum Motor fuel and producing process
US1903837A (en) * 1931-06-08 1933-04-18 Associated Electric Lab Inc Telephone system
GB409670A (en) * 1932-06-17 1934-05-01 Standard Telephones Cables Ltd Improvements in or relating to telegraph, telephone or like exchange systems
US2048506A (en) * 1935-03-07 1936-07-21 Bell Telephone Labor Inc Telephone system
US2138594A (en) * 1935-01-18 1938-11-29 Western Electric Co Telephone system
US2195317A (en) * 1939-02-24 1940-03-26 Bell Telephone Labor Inc Telephone system
US2291040A (en) * 1941-02-08 1942-07-28 Bell Telephone Labor Inc Switching system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841254A (en) * 1927-07-20 1932-01-12 Rudolph R Rosenbaum Motor fuel and producing process
US1903837A (en) * 1931-06-08 1933-04-18 Associated Electric Lab Inc Telephone system
GB409670A (en) * 1932-06-17 1934-05-01 Standard Telephones Cables Ltd Improvements in or relating to telegraph, telephone or like exchange systems
US2138594A (en) * 1935-01-18 1938-11-29 Western Electric Co Telephone system
US2048506A (en) * 1935-03-07 1936-07-21 Bell Telephone Labor Inc Telephone system
US2195317A (en) * 1939-02-24 1940-03-26 Bell Telephone Labor Inc Telephone system
US2195309A (en) * 1939-02-24 1940-03-26 Bell Telephone Labor Inc Telephone system
US2291040A (en) * 1941-02-08 1942-07-28 Bell Telephone Labor Inc Switching system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598822A (en) * 1945-10-13 1952-06-03 Roelof M M Oberman Signaling system with private branch exchange subscriber
US2570214A (en) * 1946-09-14 1951-10-09 Int Standard Electric Corp Second test circuit for selector wipers
US2557638A (en) * 1947-01-07 1951-06-19 Int Standard Electric Corp Telecommunication system
US2787657A (en) * 1948-04-01 1957-04-02 Int Standard Electric Corp Telegraph repeaters
US2640883A (en) * 1948-09-11 1953-06-02 Hartford Nat Bank & Trust Co Marker control arrangement for selectors
US2688659A (en) * 1949-10-31 1954-09-07 Hartford Nat Bank & Trust Co Circuit-arrangement for use in automatic signaling systems for numerical adjustment of a switch by a selective marking method
US2697752A (en) * 1950-10-12 1954-12-21 Hartford Nat Bank & Trust Co Device for testing characterizing impedances

Also Published As

Publication number Publication date
DE872221C (de) 1953-03-30
NL65602C (enrdf_load_stackoverflow) 1949-11-15

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