US2317833A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2317833A
US2317833A US344870A US34487040A US2317833A US 2317833 A US2317833 A US 2317833A US 344870 A US344870 A US 344870A US 34487040 A US34487040 A US 34487040A US 2317833 A US2317833 A US 2317833A
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United States
Prior art keywords
relay
contacts
relays
line
circuit
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Expired - Lifetime
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US344870A
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English (en)
Inventor
John H Voss
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Associated Electric Laboratories Inc
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Associated Electric Laboratories Inc
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Priority to FR964165D priority Critical patent/FR964165A/fr
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US344870A priority patent/US2317833A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0008—Selecting arrangements using relay selectors in the switching stages

Definitions

  • improved automatic switching apparatus which is so arranged that equipment common to'a plurality of switching links is utilized to permit certain subscribers .to obtain' access to the trunks of one or more specified trunk groups and to prevent subscribers for which a different type of service is provided from obtaining access to the trunks of the specified
  • .It is a still further object of the invention to provide an impulse-responsive, line-selecting switch of the character described, which is so arranged that the first digit of impulses trans- It is another object of the invention to promitted thereto may also be utilized for trunk group selection, for subscribers line group selection, for the partial selection of the ringing voltage to be applied to a called subscribers line. and for the purpose of determining the type of ringing to be utilized in signaling oveli ⁇ a called subscribers line.
  • each finder and connector switch of the system includes provisions for terminating two groups of lines each including one hundred lines.
  • the operating circuits for the connector group select relays of each ⁇ link are extended through contacts controlled by a pair of group select relays so that, depending upon the position of the group select relays, the connector group relays are selectively'conditioned for energization.
  • the connector group select relays include contacts individual to the operating circuits for the group relays, which are so connected and arranged that when the group select relays occupy non-corresponding positions the operating circuits for one group of the connector group relays are prepared and when the group select relays occupy different non-corresponding positions the operating circuits 'for another group of the connector group relays are prepared.
  • the group select relays are so connected and arranged that when a first digit of impulses is transmitted to the connector portion of the associated link, they will assume positions corresponding to the group of lines designated by the numerical value of the digit.
  • the first digit transmitted to the connector portion of a seized link may also be utilized to condition the link to establish a connection to a busy called line accessible thereto.
  • the apparatus provided for this purpose is so arranged that if the predetermined rst digit assigned to this function is transmitted to the link over a calling subscribers line it is absorbed, whereas if it is transmitted to the link over a. calling central olce trunk line, for example, it performs the function assigned thereto.
  • This apparatus is partially controlled lby the auxiliaryl group and unit relays provided in the equipment common to the link, these relays being utilized to identify the character of the calling line and to thus indicate to the connector end of the link whether or not the calling line is entitled to a connection to a bu'sy called line.
  • the auxiliary group and unit relays ofthe common equipment may also be used for the purpose of determining which of the subscribers lines served by the finder-connector links are t
  • These relays by selectively controlling right-of-Way circuits individual to the various links, serve to indicate to the connector portion of a, seized link whether or not a particular calling line is entitled to free central ofiice trunk service.
  • apparatus which is operative in response to the answering of a call of the revertive type for transmitting a special signal to the answering substation, thereby to inform the answering party as to the character of the call answered. More specifically, this apparatus comprises a timing device, means operative in response to the answering of a reverting call for initiating operation of the timing device and for transmitting a signal to the answering substation', and means controlled by the timing device for releasing the link occupied with the call, thereby to terminate the signal a predetermined time interval after the call is answered.
  • the selective control of the battery reversing relay embodied in each link is achieved in asimple and reliable manner by extending the operating circuit for the relay through contacts controlled only by the finder group relays which terminate the lines with respect to which operation of the battery reversing relay is required.
  • 9 which is the ninth line of the rst subgroup of lines in the first 100- line group, is illustrated as being of the multi- Darty type. serving the substations C and D.
  • This subgroup of lines also includes i'our trunks ofthe well-known ring-down type which extend to a private branch exchange oi' the manual type.
  • the lines of this trunk group are assigned the nrst four unit numbers, namely the numbers l to 4, inclusive, of the subgroup, and are automatically preselected for use through the provision of a, trunk preselect relay group
  • 'Ihe exchange also terminates a group of ten central olce trunks, one of which is indicated at I as extending to the central oiiice l.
  • I'his trunk terminates in the community exchange iny a two-way repeatervS which is connected by a link line to the set of contacts having the directory number 200.
  • 490 of trunk preselect relays is provided in association therewith.
  • the two trunk preselect relay groups i490 and I 495 are identical in arrangement and are wired exactly in accordance with the wiring of trunk preselect relays disclosed in Figs. 11 and 13 of applicant's copending application Serial No.
  • the connector portion oi the link is similar to the nnder switch Just described in that twenty group relays, including the two relays Rl400 and RI4I0,. andeach including contacts terminating ten lines of the system, are provided. These relays are 'also preferably of the-construction disclosed and claimed in the above-cited patent to Obergfell.
  • the connector portion o! the link further comprises ten unit relays whichindividually correspond to din'erent linesof each of the ten-line subgroups. ⁇ Only three of these relays.
  • Ri400, Ri400 and RI410 have been illustrated in s the drawings, thesev relays respectively corresponding to the first. ninth and tenth lines of each ten-line subgroup. ⁇
  • the lines terminating at the connector switches of the system are divided, into two groups of one hundred lines each.V
  • the connector group relays are likewise divided into ⁇ two groups, each comprising ten relays.
  • selectively controlling the operating in each ten-line subgroup and the -lines having directory numbers ending in the units designations 6, '7, 8, 9 and 0 comprise the second smaller subgroup of lines in each ten-line subgroup.
  • a plurality of under-connector links of the allrelay type are provided.
  • the details of one of the links are illustrated in Figs. 2. '1, 8. 9, 10, 11, 12,- 13, 14a and 14h of the drawings.
  • the other links included in the exchange are .identical in arrangement with the link illustrated.
  • These links are arranged to be controlled by common equipment which comprises a link distributor. also shown in Fie. 'I of the drawings. a group of distributor control relays illustrated in Fig.' 6 of the ldrawings, and a plurality of guard or auxiliary relays which are illustrated in Fig. 5 of the drawings. Briefly described, the ilnder portion of the illustrated link comprises twenty group relays.
  • the finder portion of the link also comprises ve unit relays, each of which corresponds to two lines in each of the ten-line. subgroups.
  • the relay R220 is operative in conjunction with any one of the group relays to select the lines having the unit designations of 5 and 0 in each of the twenty different subgroups of lines. It will be undestood that with one of the group relays and any one of the unit relays operated, two lines are selected from theplurality of lines to which the finder switch has access. In order to select one of the two lines thus selected by the group and unit relays, there is provided a subgroup relay R210 which functions to switch circuits oi' these two groups ofv connector. group e relays, two group selectrelays R
  • an impulse-countingl I chain is provided.
  • 'I'his counting chain is illus trated in Figs 7, 12, and 13 of the drawlngsas comprising ten counting relays'Ri240, RI250,
  • the control equipment of the link comprises aV switching-through relay R800 which is operative to by-pass the repeating coil 834 in handling central oilice trunk calls routed through the link.
  • a battery reversing relay R8I0 -a pair of line relays R820 and R825, and an impulse-correcting network which includes the two control relays I R830 and R840, a slow-acting control relay R850, and a hold relay R800.
  • the control equipment embodied in ⁇ the con-1 nector portion of the link also includes a pair of link release relays R900 and R9lll, a hack-bridfre R940 and R910, a slow-to-release lineriischarrrc control relay R950, a ring pickup relavR9Sil. and a slow-to-operate ring cut-off relay R98!!v which ⁇ may be used yalternatively with the lamp 928 in the ringing circuit of the 1ink.-dependnguponthe type ci' ring cut-oil operation desired.
  • the' ⁇ control apparatus oi the link further cnripriws n.'
  • 000 which is utilized tc determine the side of a selected line over whch ringing current is to be trol relay RIOIU, la right-of-wav'control. rela alarma line-switching remy Rigas'. a ,bug-v mi; relay Rl040,fanother line-switching relay-H1050,
  • 'I'he control equipment illustrated in Fig. l1 of the-drawings comprises a verincation relay RI
  • This equipment also includes three impulse-controlled relays RI
  • 360 For the purpose of selecting the type of ringing to be utilized in signaling over a called subscribers line of the multiparty type, of controlling the group select relays RI350 and R
  • two relays RI 200 and RI2I0 are provided which are arranged selectively to be controlled by the relays of the impulse-counting chain during the response of this chain to the impulses of a guard or auxiliary relays which individually correspond to the relays embodied in each of the finder switches.
  • this .equipment comprises twenty auxiliary group relays, three of which are indicated at R500, R5I0 and R590, which individually correspond to the twenty group relays of the finder switches.v
  • the two relays R500 and R5I0 are arranged individually to control theiinder group relays R200 and R2I'0 of thellink'illustrated.
  • auxiliary group relaysv R500, R5'I0 and R590 are auxiliary group relaysv R500, R5'I0 and R590.
  • auxiliary unit relays including the two relays R550 -and ⁇ R560 are also provided, which relays vindividually correspond to the .five unit relays of the vvarious nder switches.
  • the auxiliary relay equipment Afurther comprises arpair of vrelays R520 and R530 which function'- to controlv the subgroup relays embodied in the finder switches.
  • the link distributor or allotter equipment is also" offthe all-relay type, a group of link distributor relays;R100,. R1I0, R130. etc., being provided which individually correspond to the links and operate in ⁇ a cyclic manner to assign the respective associated links for use in a predetermined order;
  • These link distributor relays are arranged to be controlled by a group of control VIrelays which are illustrated in Fig. 6 ofthe draw- "ings as comprising a slow-acting relay RMI for controlling the auxiliary relay startl circuits and the call metering device ill, a group of1 slow-torelease ⁇ link transfer and distributor control rea,siv,ass
  • the common equipment further includes a control relay R600 which is provided for the purpose of controlling the trunk call identification circuits referred to above and described with particularity hereinafter in accordance with the operation of the associated auxiliary relays.
  • each line of the system is terminated in the usual line circuit which conventionally comprises line, cut-oil and lockout relays.
  • the line 2I6 which extends to the substation B is terminated at the exchange in a line circuit I5 which includes the line, cut-oil and lockout relays RI20, RI30 and RI25, respectively.
  • the line circuit 25 which is diagrammatically illustrated as terminating the multiparty subscribers line 2I9, is identical in arrangement with the two line circuits I0 and I 5. It will also be observed that the line circuit 20 which is provided in association with the twoway repeater 6 and includes the line, cut-0H and lockout relays RI50, RI60 and RI55, respectively.
  • the equipment common to the links also includes the usual ringing apparatus, timing apparatus and tone-generating apparatus.
  • the timing apparatus includes a timing device a, preferably of the all-relay type, which is provided for the purpose of controlling the release of the links after reverting calls routed by way thereof have been successfully completed.
  • a second timing device 120b also preferablyof the all-relay type, is provided for the purpose of forcibly releasing any link held operated over afaulty line or a line having a permanent calling condition thereon, and of controlling the link release relays of the links for the purpose of timing local call connections established by way of the links.
  • the ringing apparatusprovidedin association with the links includes a ringing current generator, preferably of the pole changer type, and a ringing code interrupter
  • This interrupter is so arranged that it provides on its associated ten interrupter leads ten'sets Iof differently coded ringing control pulses so that ten fundamental ringing codes are produced.
  • the ringing interrupter also includes provisions for preceding each of the ten fundamental codes by a short ringing code pulse so that ten additional codes are effectively produced.
  • the tone-generating equipment is illustrated in Fig. 4 oi the drawings as comprising a dial tone generator 435, a busy tone generator 440, and a reverting-call tone generator 415.
  • the dial and busy tone generators are oi identical arrangementand, accordingly, only the details of the busy tone generator have been illustrated in the drawings. Briey described.
  • this generator comprises a start relay R400 which is common to the tone-generating equipment, a buzzer 430, a slow-to-operate start relay R4I0, a control relay R420 and a transformer 662.
  • the reverting-call tone generator 415 includes a pole changing relay R400 which is arranged to be.
  • the relay RI00 prepares, at its contacts IOI,
  • the relay RI00 connects the private conductor 2I5d to ground, thereby to mark the line 2I5 as busy in the connector switches having access thereto.
  • the relay RI00 completes a circuit for energizing the auxiliary group relay R5I0 which corresponds to the first group of ten lines. This circuit extends from ground by way of the contacts I 02 and
  • the relay R5I0 When energized over this circuit the relay R5I0 completes, at its X contacts 5 I 3', anobvious holding circuit for itself, and opens, at its contacts 5I4, a. point in the common portion of the operating circuits for the ten auxiliary group relays. At its contacts SI5, 5I6, 5I1, 5I8 and 5I6, the relay R5I0, in operating, prepares the operating circuits for the ve auxiliary unit relays.
  • the circuit for energizing this relay extending from ground by way designation 5 of the calling line 2I5.
  • the relay R5I0 prepares a circuit for energizing the group relay of the assigned link.
  • the relay R5I0 prepares a circuit for energizing the right-of-way control relay RI340, assuming that the lines of the ten-line group including the line 2I5 are provided with unrestricted trunk' service such that the Y wiring illustrated in Fig. 5
  • the slow-to-release relay R520 When energized in series with the relay R560 over the above-traced circuit, the slow-to-release relay R520, at its contacts 52
  • the auxiliary unit relay R560 also operates when the above- -aced circuit is completed, and upon operating, completes, at its X contacts 565, an obvious locking circuit for itself. After this circuit is completed, the relay R560, at its contacts 564, opens a point in the common portion of the operating circuits for all of the auxiliary unit relays. At its contacts 561, the relay R560 prepares a.
  • the relay R060 prepares two paths for impressing ground potential upon thel trunk call identification lead 066i.
  • the relay R550 completes a circuit for energizing the connect relays of the link previously selected for use by the link distributor relays. Assuming that all of the links are idle, all of the link distributor relays are operated so that the link illustrated is assigned to the use of the calling line 2I5. In such case the relay R560,
  • relay R6I0 opens another point in the coninonl portion of the operating circuits for all of the auxiliary unitrelays. At its contacts 6I2, the relay R6I0 opens another point in the common portion of the operating circuits for all of the auxiliary group relays. Thus, the auxiliary relays are prevented from responding to another call until the finder switch illustrated has completed its operation to seize the calling line 2I5.
  • the relay R260 in operating, prepares, at the contacts controlled thereby, the operatingcircuits for the twenty group relays embodied in the finder switch illustrated.
  • the relay R2I0 which terminates the rst group of ten lines, is energized in response to operation of the relay R280, the operating circuits for the other nineteen group relays being held open at the yrestored contacts of the other auxiliary group relays. More specically, the circuit for energizlngthe relay R2
  • This relay in operating, prepares, at its contacts 2
  • the relay R290 upon operating, prepares the operating circuits for thevilve unit relays of the finder switch. In the case under consideration only the operating circuit for the relay R220 is completed, this circuit extendingfrom ground by way of the contacts 532 and 561, C583, the contacts 295, and the winding of R220 to battery. When energized over this circuit the relay R220 operates to prepare a locking circuit for itself at its contacts 221. At its contacts 22
  • the relay R220 connects the conductors of the line 2
  • the relay R290 prepares a circuit for energizing the subgroup relay R210.
  • the subgroup relay R530 of the common equipment Vis not operated and hence the operating circuit for the subgroup relay R210 is held open at the: contacts 603 of the restored relay R600. Accordingly, the relay R210 remains in its restored position for the duration of the call under consideration.
  • the relay R290 prepares alternative operating circuits for the five unitrelays of the finder switch, these alternative circuits being held open at the restored contacts 218 of the subgroup relay R210.
  • the 'relay R290 completes a multiple holding circuit for the link distributor relay R100 individual to the link illustrated, this multiple circuit extending from ground by way of the resistor 108, the contacts 106, C232, the contacts 292, C23I, and the winding of R100 to battery.
  • the relay R290 prepares a circuit including the trunk call identification lead C68
  • the relay R290 in operating, also completes a circuit for energizing the two line relays R820 and R82 5, this circuit extending from ground by way of the winding of R825, the winding 835, the contacts 802 and 8
  • the relay R820 When energized over this circuit the relay R820 operates to complete, at its contacts 82
  • the relay R825 also operates when energized in series with the relay R820, and, upon operating, prepares, at its contacts 826, the operating circuit for the battery reversing relay R800.
  • the relay R830 in operating, completes, at its contacts 832, an obvious circuit for energizing the relay R840, At its contacts 834, the relay R830 opens a point in the pulsing circuit traced hereinafter, over which the counting relays illustrated in Figs. 12 and 13 are successively energized during the transmission of impulses to the connector portion of the link. At its contacts 833, the relay R830 completes a locking circuit for itself, this locking circuit extending. from ground by way of the contacts 833, the resistor 823, the contacts 82
  • the relay R830 completes a circuit for energizing the slow-acting relay R850, this circuit extending from ground by way of the contacts 9
  • the relay R840 opens a point in the above-traced operating circuit for the pulsing relay R830.
  • the relay R850 in operating, prepares, at its contacts 85
  • the relay R850 completes an obvious circuit for energizing the hold relay R860.
  • the relay R850 opens a point in the circuit traced hereinafter for energizing the reverting-call relay R940.
  • the relay R850 completes a path for impressing ground potential upon the tone apparatus start conductor C895, thereby to energize the tone start relay R400. More specically, this relay is energized over a circuit which extends from ground by Way of the contacts
  • the hold relay R860 in operating, prepares, at its contacts 866,v locking and operating circuits for the relays R8
  • the relay R860 completes an obvious path for impressing ground potential upon the release conductor C893, thereby to prepare f operating andlocking circuits, traced hereinafter, for certain of the other control relays embodied in the link.
  • the relay R860 completes an obvious path for impressing ground potential upon the release conductor C893, thereby to prepare f operating andlocking circuits, traced hereinafter, for certain of the other control relays embodied in the link.
  • relay R860 completes a path including the con-l tacts 8
  • the relay R860 prepares a circuit traced hereinafter for energizing the link release relay R900.
  • the relay R860 prepares the above-mentioned circuit for transmitting impulses to the relays of the counting chain illustrated in Figs. 12 and 13 of the drawings.
  • the relay R860 opens one of the multiple paths included in the normally completed holding circuit for the link distributor relay R100, this circuit now being closed at the engaged contacts 292 of the operated connect relay R290.
  • the relay R860 completes the prepared holding circuits for the group and unit relays- R2

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US344870A 1940-07-11 1940-07-11 Telephone system Expired - Lifetime US2317833A (en)

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FR964165D FR964165A (cs) 1940-07-11
US344870A US2317833A (en) 1940-07-11 1940-07-11 Telephone system

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522720A (en) * 1947-07-22 1950-09-19 Automatic Elect Lab All relay system in which local called telephone line is fed talking battery from connector or repeater
US2570763A (en) * 1947-12-06 1951-10-09 North Electric Mfg Company Dial-back trunking system for tleephone exchanges
US2668194A (en) * 1949-09-13 1954-02-02 Stromberg Carlson Co Finder-allotter circuit for telephone systems
US2874225A (en) * 1954-05-14 1959-02-17 Itt Busy-verification automatic telephone system
US2934605A (en) * 1954-12-07 1960-04-26 Itt Toll-discriminating outgoing repeater system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522720A (en) * 1947-07-22 1950-09-19 Automatic Elect Lab All relay system in which local called telephone line is fed talking battery from connector or repeater
US2570763A (en) * 1947-12-06 1951-10-09 North Electric Mfg Company Dial-back trunking system for tleephone exchanges
US2668194A (en) * 1949-09-13 1954-02-02 Stromberg Carlson Co Finder-allotter circuit for telephone systems
US2874225A (en) * 1954-05-14 1959-02-17 Itt Busy-verification automatic telephone system
US2934605A (en) * 1954-12-07 1960-04-26 Itt Toll-discriminating outgoing repeater system

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FR964165A (cs) 1950-08-08

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