USRE24680E - Automatic telephone exchanges - Google Patents

Automatic telephone exchanges Download PDF

Info

Publication number
USRE24680E
USRE24680E US24680DE USRE24680E US RE24680 E USRE24680 E US RE24680E US 24680D E US24680D E US 24680DE US RE24680 E USRE24680 E US RE24680E
Authority
US
United States
Prior art keywords
pulses
switching devices
terminals
selector switching
output terminal
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
Other languages
English (en)
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.)
Publication date
Application granted granted Critical
Publication of USRE24680E publication Critical patent/USRE24680E/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Definitions

  • the present invention relates to coding devices suitable for use in an automatic exchange asdescribed inthe speccation of said cto-pending U.S. patent application, Serial No. 2471 ,'072.
  • An object oct the present invention is to provide a coding ,device suitable for storing dialling signals from ⁇ a calling subscriber, converting these signals into a set of 'control signals suitable for application to the aforesaid routing device,'and in addition giving the control signals a characteristic ,identified with the aforesaid selected free channel.
  • a -coding device comprises two or more selector switching devices, each having a plurality o'f input terminals, an output terminal, and 4being adapted, Tin response to ydiierent dialling signals to connect 'different ones of the inputterminals to the output terminal, means 4for applying control voltages of 'differ-ent, predetermined characteristics tothe input terminalsrespectively ofthe lselector switching devices, means for combining the control voltages appearing attheoutput terminals of Ithe several selector 'switching devices to 'form a set,andmeans for Vadding a further characteristic to -the vset of control voltages.
  • the means for adding the further characteristic :to the lcombined control Vvoltages may'comprise a gate device vto which the 'combined control voltages are applied. Pulses in the selected free channel maybe ⁇ applied to the gate device to open the gate recurrently whereby the combined control voltages appear at the 'output ofthe gate only during'each pulse in the selected channel.
  • "-Ihe means for adding the further ⁇ characteristic may comprise means for combining 4further voltages with -the set, lthe ffurther ⁇ voltages having characteristics ⁇ ind'ependentof fthosein the set.
  • the control voltages may be, for example, .pulses of different instants of occurrence, or ⁇ oscillations ,of clii'terent frequencies.
  • the dialling impulses lrepresenting .the ⁇ diierent digits dialled maybe ⁇ applied to set .different ones of the ⁇ selectors switching ⁇ devices in known manner, and a further switch device may Abe arranged .to yprevent -the .output Yfrom at least the last selector switching device to be set, from reaching the output of the ⁇ coding device. r
  • a dial DL1of anautomatic telephone ⁇ set (not shown) is connectedin series with a relay coil A and albattery BATl.
  • operation of the dial DL causes a series of pulses o'f .current to ow'throngh the relay coil A at ,the standard frequency of "1"() 'P ⁇ .P;S. jIt will be assumed ⁇ that the bnumber -dialled has four digits, say 12, 3, 4 respectively.
  • the lpulses of current .in ⁇ the relay coil AV cause operation ofthe contacts A1 at ⁇ the same rate. These contacts are connected to the .wiper of-a bank Z1 of a unis'e'lector Z, and the wiper of the bank Z1 is normally onits liir'st contact.
  • This first contact is connected 'through the winding of a second uniselector M and a 'battery BAT2 to earth.
  • the uniselectors and stepping action thereof may be as .described in chapter 3 of Telephonyg vol. II, by I. Atkinson, published by Sir Isaac Pitman & Sons Ltd.
  • the bank M1 of the uniselec'tor ,M has elevenfbank contacts, 'the iirst of whichis a home contact.
  • the remaining ten bank contacts .o'f 'M1 are connected to ten terminals MB1 to ⁇ MP9 ⁇ and MP0 respectively.
  • a slow acting relay ⁇ B has one terminal of its operating coil connected to the contacts A1 Xand. the other through a battery BATa to earth.
  • the ,relay is arranged to hold between adjacent impulsesin each digitdialled and hence becomes operated and released once 'for each digit ⁇ dialled.
  • .the .wipers .of -the uniselector Z makes one ,forward step-after each rdigitris dialled.
  • .-the;second.digit (2in this-example) is dialled'the wiper of :the bank ais onits second bank contact. This is connected .through rthe.operating-rvinding of aiuniselectoriC and thence throu'ghabatt'ery BATS to earth.
  • the bank -'C1 of ythe 4uniselector 'C I has ueleven contacts of which the first is an isolated home contact.
  • Thev remaining ten bank contacts are connected to terminals CP1 to CP9 and CP1, respectively.
  • the wiper of Ithe bank C1 becomes connected to the terminal CP2.
  • the relay B steps the wiper of the uniselector bank Z1 on to its third contact before the third digit is dialled.
  • the third contact of Z1 is connected through the operating winding of a uniselector D and thence through a battery BAT, to earth.
  • the relay B steps the wiper of the uniselector Z on to its fourth contact.
  • the fourth contact is connected to the operating winding of a uniselector U and thence through a battery BAT, to earth.
  • the bank U1 of the uniselector U has eleven bank contacts of which the first is in isolated home contact. The remaining ten bank contacts are connected to ten terminals UP1 to UPg and UPO respectively. Thus in this example the wiper of the bank U1 becomes connected to the terminal UP4.
  • 'Ihe 40 terminals UP1 through to MP0 are connected by suitable connectors (not shown) to the 40 output terminals of like reference respectively of a main pulse generator MPG.
  • This pulse generator is arranged in any suitable manner to generate a recurring sequence of 40 pulses which appear at the 40 ⁇ terminals MP0 to UPS respectively.
  • the pulse generator may be as described in the specification of said copending U.S. patent application, Serial No. 247,072.
  • the generated pulses will be referred to by the letters M, C, D and U followed by a subscript corresponding to the subscripts in the references to the terminals at which the pulses appear.
  • pulses M1, C2, D3 and U4 appear at the wipers of the four uniselector banks M1, C1, D1 and U1 respectively.
  • This set of pulses is regularly recurring as indicated in Figure 2(a).
  • the pulses of each set are combined through four rectiers W1 to W4 respectively and applied through a resistor R and relay contacts Q2 to an output terminal T.
  • An auxiliary pulse generator APG is connected through a rectifier W to the end of the resistor R remote from the rectiers W1 to W4.
  • This pulse generator is arranged to generate relatively broad pulses of a width equal to that of a complete sequence of M, C, D and U pulses, and at a recurrence frequency equal to one fth of that of the sets of M, C, D and U pulses.
  • the waveformof the pulses provided by the auxiliary pulse generator is as shown at GP in Figure 2(b).
  • the rectifier W5 In the absence of pulses from the auxiliary generator APG the rectifier W5 is conducting and hence the sets of pulses from the uniselector banks M1, C1, D1 and U1 are dropped across R. When a pulses appears at the output of the pulse generator APG, however, the rectifier W5 becomes non-conducting and permits pulses to pass from the uniselector banks to the contacts Q2. Thus in the present example only every fifth set of M1, C2, D3 aud U4 pulses are passed to the contacts Q2.
  • the relay B steps the wiper of Z1 on to its fifth contact and hence causes energisation of a relay coil Q from a battery BATB.
  • the relay contacts Q2 close and the sets of M1, C11, D3 and U1 pulses gated by the auxiliary generator APG appear at the output terminal OT.
  • Thecontacts Q1 holdthe relay Q through a switch 4 S1 which is closed before the apparatus is put into use.
  • the switch S1 may, of course, conveniently be contacts of a further relay (not shown).
  • the uniselector banks M2, C2, D2 and U2 and Z2 are homing banks and may operate as described on pages 259 and 260 of Telephony, volume II, by Atkinson.
  • switches S2 to S6 which may also conveniently be contacts of a relay (not shown) are closed to cause all uniselectors to home, and S1 is opened to deenergise the relay Q and hence to open the contacts Q2.
  • the output of the auxiliary pulse generator APG is of different form, the resistor R is removed and the rectifier W5 reversed.
  • the pulse generator APG is arranged to generate pulses which occur after the last U pulse in each set and before the M pulse in the next succeeding set.
  • Coding apparatus for automatic exchanges comprising a main input terminal to receive dialling impulses, a plurality of selector switching devices each having a plurality of input terminals and an output terminal, control apparatus to actuate said selector switching devices in response to dialling impulses, means to apply dialling impulses from said main input terminal to said control apparatus to select different ones of the said input terminals of said selector switching devices for connection to said output terminals thereof respectively, a source of voltages of dilerent characteristics, means to apply said voltages to the input terminals of said selector switching devices, dilferent voltages being applied to different ones of the last said terminals, a combining circuit connecting the output terminals of said selector switching devices to provide a combined output from said selector switching devices a source of signalling voltage, a further combining circuit, a main output terminal, means connecting said further combining circuit between the first said combining circuit and said main output terminal, and means to apply signal Voltage from the last said source to said further combining circuit to produce at said main output terminal a signal
  • said further combining circuit comprises a gate device ⁇ through which said combined output from said selector switching devices is applied to said main output terminal and said signal voltage from the last said source is applied to open and close said gate device whereby the voltage at said main output terminal is in the form of a succession of groups of voltages characteristic of said dialling impulses and whose instants of occurrence are characteristic of said signal voltage] 3.
  • ⁇ Coding apparatus for automatic exchanges, com,- prising a main input terminal to receive dialling impulses, a plurality of selector switching devices each having a plurality of input terminals and an output terminal, control apparatus to actuate said selector switching devices in response to dialling impulses, means to apply dialling impulses from said main input terminal to said control apparatus to select different ones of the said input terminals of said selector switching devices for connection to said output terminals thereof respectively, means to generate a plurality of interlaced recurring pulses, means to apply different ones of said recurring pulses to diiferent ones of the input terminals of said selector switching devices, a combining circuit connected to the output terminals of said selector switching devices to combine the outputs of said selector switching devices into a recurring group of pulses characteristic of said dialling impulses, a main output terminal, ,a gate device, means connecting said gate device between said combining circuit and said main output terminal, a source of signalling pulses, and means to connect said source of signalling pulses to said
  • Coding apparatus for automatic exchanges, comprising a main input terminal to receive dialling impulses, a plurality of selector switching devices each having a plurality of input terminals and an output terminal, control apparatus to actuate said selector switching devices in response to dialling impulses, means to apply dialling impulses from said main input terminal to said control apparatus to select dierent ones of the said input terminals of said selector switching devices for connection to said output terminals thereof respectively, means to generate a plurality of interlaced recurring pulses, means to apply dilerent ones of said recurring pulses to diierent ones of the input terminals of said selector switching devices, a combining circuit connected to the output terminals of said selector switching devices to combine the outputs of said selector switching devices into a recurring group of pulses characteristic of said dialling impulses, a main output terminal, a further combining circuit, means connecting said further combining circuit between the rst said combining circuit and said main output terminal, a source of signalling pulses, and means to apply signalling pulses from the
  • Coding apparatus for automatic exchanges comprising a main input terminal to receive dialling impulses, a plurality of selector switching devices each having a plurality of input terminals and an output terminal, control apparatus to actuate said selector switching devices in response to dialling impulses, means to apply dialling impulses from said main input terminal to said control apparatus to select different ones of the said input terminals of said selector switching devices for connection to said output terminals thereof respectively, a source of voltages of dlerent characteristics, means to apply said voltages to the input terminals of said selector switching devices, different voltages being applied to different ones of the last said terminals, a combining circuit connecting the output terminals of said selector switching devices to provide a combined output from said selector switching devices, a source of signalling voltage, means for cornbining a signal voltage from the last named source with said combined output, a main output terminal and means applying the signal voltage combined with the combined output to said main output terminal whereby to produce at said main output terminal a signal having characteristics related to said dialling impulses and to a
  • Coding apparatus for automatic exchanges comprising a main input terminal to receive dialling impulses, a plurality of selector switching devices each having a plurality of input terminals and an output terminal, control apparatus to actuate said selector switching devices in response to dialling impulses, means to apply dialling impulses from said main input terminal to said control apparatus to select dierent ones of the said input terminals of said selector switching devices' for connection to said output terminals thereoyc respectively, a source of voltages of dierent characteristics, means to apply said voltages to the input terminals of said selector switching device, derent voltages being applied to dierent ones of the last said terminals, a combining circuit connecting the output terminals of said selector switching devices to provide a combined output from said selector switching devices, a source of signalling voltage, a further combining circuit, a main output terminal, means connecting said further combining circuit between the first said combining circuit and said main output terminal, and means to apply signal voltage from the last said source to said further combining circuit to produce at said main output terminal a

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
US24680D 1950-09-22 Automatic telephone exchanges Expired USRE24680E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1042298X 1950-09-22

Publications (1)

Publication Number Publication Date
USRE24680E true USRE24680E (en) 1959-08-11

Family

ID=10869927

Family Applications (2)

Application Number Title Priority Date Filing Date
US2732433D Expired - Lifetime US2732433A (en) 1950-09-22 Automatic telephone exchanges
US24680D Expired USRE24680E (en) 1950-09-22 Automatic telephone exchanges

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US2732433D Expired - Lifetime US2732433A (en) 1950-09-22 Automatic telephone exchanges

Country Status (2)

Country Link
US (2) USRE24680E (fr)
FR (1) FR1042298A (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379715A (en) * 1942-10-09 1945-07-03 Bell Telephone Labor Inc Communication system
US2570274A (en) * 1946-03-14 1951-10-09 Int Standard Electric Corp Electron beam switching tube and system
US2457149A (en) * 1947-03-20 1948-12-28 Int Standard Electric Corp Selective signaling circuit
NL91387C (fr) * 1949-06-02
NL158592B (nl) * 1950-01-16 Nikkiso Co Ltd Samenstel van een pomp met elektromotor.

Also Published As

Publication number Publication date
US2732433A (en) 1956-01-24
FR1042298A (fr) 1953-10-30

Similar Documents

Publication Publication Date Title
US2754367A (en) Automatic exchange
US2291481A (en) Telephone system
US1691410A (en) Automatic telephone system
US2613278A (en) Telephone system
USRE24680E (en) Automatic telephone exchanges
US2850576A (en) Line concentrator system
US1482618A (en) Telephone-exchange system
US2574944A (en) All relay automatic telephone system trunk selection
US1970337A (en) Telephone system
US1903207A (en) Telephone system
US1910393A (en) Automatic telephone system
US3217107A (en) Line concentrator and signaling system therefor
US1714718A (en) A cobfosation of dela
US1839460A (en) Telephone system
US2014221A (en) Telephone system
US1543869A (en) Telephone-exchange system
US1721226A (en) Multioffice telephone system
US2604539A (en) Automatic telephone switching system
US1505171A (en) Telephone-exchange system
US3078347A (en) Plural service telephone connectors controlled by common markers
US1727133A (en) Party-line automatic telephone system
US1577033A (en) Automatic telephone-exchange system
US1688150A (en) Signors
US1848399A (en) Telephone system
US1713813A (en) Automatic telephone system