US2369062A - Automatic toll ticketing system - Google Patents

Description

Feb. 6, 1945. MCDAVITT AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 4 Sheets-Sheet l INVENTOR M B. McDAV/TT 6 6. M

ATTORNEY F eb. 6, 1945.

M. B. M DAVITT AUTOMATIC TOLL TICKETING SYSTEM 4 Sheets-Sheet 5 Filed June 2'7, 1942 MOM k QR INVENTOR M B. McDAV/TT ATTORNEY 1945- M. B. M DAVITT AUTOMATIC TOLL TICKETING SYSTEM 4 Sheets-Sheet 4 Filed June 27, 1942 0 o 0 o a a a 0 0000000000000 INVENTOR M 5. McDAl/IZ' ATTORNEY Patented Feb. 6, 1945 UNITED, STATES PATENT OFFICE AUTOMATIG TOLL TICKETING Marcellus B. M'c'D'avitt, Hartsdale, N. 1 .,:assignor to Bell Telephone Laboratories, Incorporated; New York, Y., a corporation of New York Application June :27, 1942, Serial the. noise is "Claims.

This inventionrelates to a telephone system and more particularly to a system in which connections are established to certain ofiices over a tandem trunk by selecting the trunk in response to .the dialing of one or more of the office code digits of a wanted line designation and in which it is necessary to secure a record of the office code digits dialed for controlling the rurther extension of .a connection from the trunk to the ciiice in which the desired line terminates or for other purposes.

In telephone systems of the type in which selector switches are controlled by a register sender common to all lines of an originating office in which both the ofiice code digits and numerical digits of wanted lines are registered in response to dialing "by the calling subscriber, it is well-known practice when the wanted line terminates in a distant oflice to provide intermediate or tandem ofiices through which such calls are extended to such distant ofiic'es. 'Such tandem ofiice is provided with trunks incoming from originating offices which terminate in selector switches having access to trunks outgoing to such distant ofiices and with tandem senders accessible from the tandem trunks which are capable of controlling selector switches to extend a connection'ifrom a tandem trunk to a desired distant oilice and for sett ing selector switches in the selected distant 'ofii'ce to complete the connection. The t-andem trunk is selected by the setting of selector switches in response to the registration of the office code digits of a wanted line which terminates in the distant office whereupon the tandem trunk seizes an idle tandem sender and the originating sender trans- :fers all of its digit registrations including the office code and numerical digit'regis-trations of the wanted line number to registers "of the tandem sender. 'I'h'e tandem sender then proceeds-to control selector switchestoextend a connection from the tandem trunk to the enice of the wanted line 'in accordance with the office code digit registrations transferred thereto from the originating sender and to control selector switches in the selectedoffice in accordance with the numerical digit registrations transierre thereto from the originating sender.

When, however, it becomes desirable to provide tandem oflice equipment of the type above described in telephone systems which have no common senders in the originating offices and in which the selector switches are of the type which are =controlled in their selective movements directly under the control of the calling subscribers dial, it becomes necessary when a tandem trunk is selected b y the :settingo-f such selector switches in response to the dialing of the office code digits or -'-a Wanted line terminating a distant once "he reached overthe tandem trunk, to provlde-means-iior ascertain me the ofiice code digits which have been dialed so that a sender may "register 's'uch digits for use in further extending the connection from the tandem trunk to such wanted .ofiice.

A specific application or tandem trunking of this character may "be made, for example, in connection with the extension of short haul 'toll connections to ofiices in the nearby toll area in which the tandem trunks areprovided with automatic toll ticket printing facilities whereby all such short 'liau'l toll connections'n'iay be established automatically under the control of a calling -subS(':li'lie1""s dial and the "tollticket may be automatically printed. A system of this type is disclosed in the cop'ending application or J. w. Gooderham, Serial NO. 448,782, i'fi'led June 27., 1942 concurrently herewith. Since for ticketing purposes the ticket'printer must be supplied with the designations of both the calling "and wanted line, it is further essential that the ofiice code digits of thewantediine, dialed "by a calling subs'crib er'to select the tandem trunk *bemade available forthe use of the' to-l'lticket printer.

It'isthereioretheobject of the present invention to provide facilities at a tandem trunk and at the equipment associable therw'ithwhich may, in a simple and accurate manner ascerw tan any office code digits which a calling su'b 'sc'riber may have dialed in setting up a connec tion to the tandem trunk and which may; in conjunction with an code digit dialed subsequent to theseizure 'of the trunkmake a record of the entireofiice code of a wanted line number.

Asjil'lustrated herein a "subscriber desiring a connection to a line terminating in :an oflice or a nearby toll area, "first-removes'his receiver from theswitchhookwhereby an'id'le line finder, paired with a first selector, is started in search of the calling line and, as soon as the'lin'e is found,

the usual dial tone is transmitted. I Uponhear- 'ing the dial tone, the subscriber thenproceeds to dial the ofli'ce code and "numerical digits of the wantedline number. In response to the dialing of one or more ofthe office code digits'gth'e selec tors of a switching train including the first selector are operated to extend a connection from'the calling line to anid'le tandem or 'ai'ltomatic ticket'ing trunk accessible" 'irorri sucnlmes of the office in which the calling .lihe terminates .are permitted to estarlisii- .tbll connections b3! dialing, over which trunk a connection @niay' be vfurther extended to the office which the wanted. line terminates. I I I .I-mmeiiiatelz, following the seizure of the trunk an idle sender common to a plurality of such trunks tisiassociated withthe seized trunk over a trunk :flnder.- Since :a digit dialed by :a calling subscriber might be lost during the time -elapsing between the seizure :of the :trunkand the seizure of an "idle sender, the trunk- :is' provided with a seized by a sender in response to digit register for registering the digit dialed following the last code digit dialed to reach the trunk. The sender is provided with registers for registering-the remaining digits of the called line number dialed by a calling subscriber. On calls first selector in response to theidialing of a first ofice code digit. On calls toother ofiices'the trunk maybe seized by a second selector in re-.

sponse to the dialing of two'oflice code digits.

On calls to still other oificesthe trunk may be seized by a third selector in response to the dialing of three office code digits. In other cases a trunk may be seized in response to the setting of a se-v ing trunks' Since a trunk may be seized in response to the dialing of one, two 'or three code Fig. 3 should be placed to the right of Fig. 2; and Fig. 4 should be placed beneath Fig. 3.

' The line finders I03, I04 and I0 5, the first selectors I06. 101 and I.08,the second selectors H19 and H0, and the third selector Hi may be of to certain offices, the trunk may be seized by a; lithe well-known step-by-step type and the selectors may be controlled directly by a calling subscribersidial totestablish local connections or to establish a" connection to an idle automatic ticketing trunk such as trunk H3 or H4 should the subscriber desire a connection to a subthe same trunk may have appearances in more digits, the trunk register mayr'egist'er either the second'or third code digit or the thousands numerical digit.

than one bank level of the same selector switch, whereby the trunk may be seized in response to I the dialing of the'first code digit of certain dis- As soon as a first digit has been registered in,

the sender, which digit may be either the third code digit, the thousands numerical digit or the hundreds numerical digit, an idle identifier is associated with the sender over an identifier-connector and theidentifier is associated directly establishes a record in the identifier from which the office code digits dialed to reach the trunk may be reconstructed and if other code digits have been registered by the trunk register or by the first register of the sender, such registration -or registrations are also transferred to the iden tifierwherebyfr'om all such data registered in the identifier, a route relay, isoperated which is instrumental-in furnishing all of the'iniormation required by the sender and/the ticketing equipment of the trunkconcerning the called line and the manner in which the call from the calling :line to the called line shall be: ticketed. 4 w

The invention having "been described' in a gen-v eral manner, reference may now be had to the following detailed description thereof taken in whichf 1 I v i Fig. 1 shows schematically, calling lines, line finders and a train of first and 'second and third selector switchesfor extendinga connection from ,calling lines to tandem automatic ticketing trunks, two or which are'illustr'ated and a selector switch-of the type having access over a divided bank level to two groups of outgoing trunks; i

Fig. 2 shows a "rotary out-trunk switch accessible froma trunk incoming ,ffrom the divided 3 7 bank level switch and having access to a group of twenty automatic ticketing trunks; 1

' Fig. 3 shows trunk-identifier connectors over which'controlconductors from groups of automatic ticketing trunks may be extended-to that one of a plurality of identifiers which has been ticketing trunk; and a r Fig. 4 shows such portions of an identifier as are necessary to an understanding ofthe present invenfign m .3 For a full disclosure of the-present invention,

Fig. 2 should be placed to the right :-of Fig. .1;

5i connection with the accompanying drawings in the seizure of a I tant ofiices, in response to the dialing of the first and second code digits of other ofiices and in response to the dialing of the three code digits of still other oflices. To simplify the disclosure but two groups of tandem trunks areshown available for serving connections to all olfices in the toll area., In the commercial use of the invention, however, a plurality of groups of trunks would be required to handle the toll traific, for example, 200'trunks divided into ten main subgroups-oi twenty. trunks each with each such subgroup subdivided into other minor subgroups of ten trunks eachsome of the groups of trunks would be made available only from bank levels of first selectors, other groups would be madeaccessible,

. only from bank levels of second selectors and still other groups would be made accessible only from bank levels of third selectors. Still other groups might have branches as disclosed accessible from bank levels of different selectors and from banks of one or more rotary out trunk switches. The trunking scheme may therefore be made I quite flexible for accommodating the trunk groups in accordance with the density'of the tolltrafficto difi'erent portions of the toll area.

The selector switch ,I 12 of Fig. 1 may be of the divided level step-by-step type disclosed for example in Patent No. 2,249,067, granted July 15, 1941, to P. W. Wadsworth, and have access over the same bank level thereof to two groups of trunks terminating in rotary out-trunk secondary switches. One such trunk is schematically shown as H5 terminating in the rotary out-trunk switch 200 of Fig. 2. The switchZBfl is of the step-bystep type disclosed in Patent 1372365,

' granted October 30, 1923, to Forsberg et al. The

switch 200 is disclosed as having access to branches of trunks of two of the minor subgroups including the trunks H3 and H4.

Each ticketing trunk is provided with a sleeve relay such'as relays 206,201,108 and 209 connected into the sleeve conductors of each bank level appearance of a trunk in the banks of'first, second, third and divided levelswitches which relays are instrumental in establishing code signaling circuits through the trunk-identifier-con nectors to the identifier seized to handle the call to enablethe dialed office code digit of a desired line to be reconstructed.

- Two of the ten trunk-identifier connector cir cuits required to connect any one; of the 200 ticketing trunks tojthe identifier seized 'toi serve a .connection' are 'disclosedrin; Fig. 3.; .Each con,-

necto circuit serves .20 trunks and is provided with a multicontactr lay fore h identifier a with a lookout re ayfor each. ident fier- The identifier is provided with a group oi ten multicontact relays 400 to 409, which serve as a register to which an ofi ce code digit or the th usands it dial into theregister 250 of the ti k ting trunk may be transf rr a group of ten multicontact relays 410 to H9 which serve as a register to which an office code digit or thousands or hundreds numerical digit dialed into the first dial pulse receiving register of the sender may be transferred and a group of multicontact relay su h. as r lay 420., in l ing a relay for each oi eight possible first selector level appearances of ticketing trunks and a relay for each of the, ossible second selector level appearanc s i trunks whi h relays coope ate with the t unk code e is r re ays 401) to 489 to make a translation of the first code digit dialed to set a If first selector anda second code digit dialed to set the register of the trunk or to make a translation of the first and second code digits dialed to set first and s c d sel t rs and a third cod digit dialed to set. theregister of the trunk. A furth r oup of mult contact r lays, in ud n r lay .2 is prov ded,- which r lays, coop r t wit the sender c de re ist r r ay 1 to 9 o m a t ansla i n i t e r t tw c d digits as translated by one of the trunk translator relays, for example, relay 4,2,8 and a third code digit.dialed into the sender and transferred to the sender code register relay M0 to M9. The identifier is also provided with a route relay, such as relays 423, 424 and 425, for each possible called oflice route andwith additional relays con trolled thereby to transfer oifice code digits and other information concern ng the called line to the sender;

To more, clearly set forth the novel features of the invention, it will, be assumed that the call ing subscriber whose substation is. identified by the numeral IU Q initiates av call for a toll connection to a subscribers line terminating in an ofiice of the toll area to. which the calling subwanted line number.

It will first be assumed that the calling subscriber desires a connection with a line whose directory number is MAR-4345 and that a ticketing trunk over which a connection to this office may be extended may be reached from the sixth bank level of the first selector I06. The calling subscriber upon hearing the dial tone therefore proceeds to dial the office code letters M, A, R, and the numerical digits 1,3, 4", 5. In response to the dialing; of the first office code letter M, which has a numerical equivalent 6, the first selector IDS-is operated to elevate its brushes to a position opposite its sixth bank level and to then hunt over theterminals of this level in search of an idle ticketing trunk. It will be as'- sumed that the trunk indicatedby the numeral II 3.is id1e and that therefore when the test brush ofv the selector L06, engages test terminal: II6 of this trunk, it; will; encounter? no vbusy, ground.

potential thereon and therefore "the "selector switch will seize the trunk to extenda connece tion from the calling line to the tip andring con;-

ductors of the trunk. As fully described inithe Gooderham application hereinbefore referred to, the trunk proceeds to cause the operation of a trunk finder (not shown) .to associate the trunk with an idle, sender and to establish a circuit from ground at the selector I06 over the sleeve I I] of the trunk through the'lower winding of sleeve relay 206, through the winding of relay 2 I 0 and in parallel therewith over the back contact of re= lay 2H] and throughresistance 209 to battery. Relay 2.06 operates from the low resistance bate tery thus supplied, prepares a locking circuit over its upper winding and uppermost front contacts to battery, short-circuits its lower winding and prepares a codesignaling circuit to code lead 2I2 as will be later described. The trunk is now prepared to receive the second code letter A dialed by the subscriber which is registered as the digit] by the digit register 25,9 of the trunk in the manner fully described in theGooderharn application hereinbefore referred to.

By the time the second code letter dialed by the calling subscribe-r has been registered by the trunk register, a sender will have been associated with the trunk and the dialing circuit will upon the completion of the registration of the second code letter be extended over the brushes-of the trunk finder to. the sender. Therefore when the calling subscriber dials the third code letter R, which has a numerical value of 7, the first dial pulse receiving register of the sender is,v set to register the third code letter. As soon as a digit has been registered in the sender, an idle identi-- fier for identifying the calling line; is associated with the sender and the identifier is informed through the prior operation of the trunk finder in which main group of 1 00 trunks and inwhich ZO-trunk subgroup of such main group the calling trunk is located. t

It will be assumed that the first identifier has been taken for use and that therefore a circuitis: establish d- Which may betraced in part over conductor 3M, through thewinding of lock-out relay 300E, allocated to. the first, identifier andto the trunk-identifier-connector circuit having ac:-

cess, tothe Nos. 0, and 9 subgroups of the main group of trunks which the calling line is assumed to: be located and over; the inner upper normal contacts of: similar lock-out relays allocated to other identifiers to ground. Relay 300F- operates if the trunkridentifier-connector circuit; is not at thetime being used by another identifier on another call; locks over its upper inner alternate contacts to ground; establishes an operating circuit for the multicontact relay 3021? fromground through the winding of such relay over the inner lower front contact of relay 30F, through resistance 303 to battery and establishes: a circuit from'batterythrough resistance 304 overits middle upper front contact, conductor 305 and thence. overa circuit not disclosed but fullyde scribed in the Gooderham; application hereinbe: fore referred to which extends over contacts of the identifier-connector and trunk finder to: ground through the winding, of relay 213 otthe calling trunk. With multicontact relay 3021? of the; trunk-identifier-connector circuit and relay 2I3 of the trunk both, operated, a plurality of control conductors are-extended from the trunk to the identifien It is to be: noted; that: toserve each main groupf 10.0 tnunksrfive trunk identifier-conn ctor cit-ecults, of which two are disclosed inFig.'3 are provided, the connector circuit comprising the lock-out relays 300Fto 300L and the multic'ontact relays 302F to 3021. serving the Nos. and 9 subgroups of trunks or 20 trunks, the connector circuit comprising the look-out relays 3IOF to 3IOL and the multicontact relays 3I2F to 3I 2 Lserving the Nos. 1 and 4 subgroups and the three other connector circuitslnot' shown) serving, respec- I tively', subgroups 2 and 5, 3 and 6 and 7 and 8. A

similar group of five connector circuits would serve the second main group of 100 trunks.

As previously stated a sleeve relay, such as 206, is provided for each selector level appearance of a trunk and the code leads such as 2 [2 associated with any trunk are connected over the contacts of the sleeve relays of all appearances of the par ticular trunk involved which appearances may be at the bank levels of first, second or third selec- Where the bank appearances are ter-' tors.

minated in rotary out-trunk switches, such as the one shown in Fig. 2, the code leads are con, nected to the bank associated with brush 205 of such switch, over brush 205, over contacts of the sleeve relay, such as relay 203, of the appearance of the trunk in a level of the divided level selector, such as I I2, and over brush 204 and a terminal of the bank associated therewith. There will thus be a number of code leads connected between the contacts of the sleeve relays and the cross-connecting rack 30B associated with the trunk-identifier-connector circuit serving the subgroup of 20 I trunks in which such trunk is located, one lead for each routeappearance of the ticketing trunks of the two subgroups servedby the connector circuit- After the operation of relays 302F and 2l3 as-previously described, battery applied from the identifier to conductor 307 is connected over contact'308 of relay 302F, conductorl 2l4, con-; tacts of relay 213, lower contacts of the operated a sleeve relay in the case assumed relay 206, to one of the code leads, for example 2|2 terminating in 1 the cross-connecting rack 306. The code leads are cross-connected over the rack 306 to con ductors which may be connected by contacts of an operated connector relay such as 302F to code leads extending to a cross-connecting rack 426 in the identifier.

The number of code leads, such as 309, extending through the connector circuit to the identifier willdepend upon the number of possible route appearances of the trunk at the banks of selectors. first selectors were involved in ticketing trafilc, there would be a maximum of eight code leads corresponding with the eight appearances at the 1 first selectors. ,In alike manner the maximum of route appearances thatmight occur from the bank levels of the second selectors available for ticketing trafiic would be eight times eight or sixty-four appearances or code leads if all twodigit codes were involved in outgoing ticketing traffic. The number of route appearances from the banks of third selectors is an indeterminate number depending upon the number of routes involved through the bank levels of the third selectors. The cross-connection racks 306 and For example if eight of the levels of the ing rack 426 may be cross-connected to the'wind' ings of route relays, such as 423, or'to a trunk translator relay such as 420 or toa vacantcode relay 421. i I

x As previously stated, the identifier is provided with a route relay, such as 423, 424 and 425 for each called ofiice route, contacts of such route I relays being associated with cross-connection racks-428 and 429 so as to convey to the sender all of the information relating to the setting up of the connection to the called office route involved. The route relay for a called office will,

in some cases, be operated directly from the code lead over'cross-connection at the rack 420. The route relay 423 is shown so connected. The. route relay in other cases may require a com bination of the information obtained from a code lead and the digit which has been dialed into the trunk before it can be operated. In

such a case the winding of the route relay, as

for example relay 425, is connected to a terminal on connecting rack 430 over which it'may be cross-connected to a contact ofone of the trunk code translator relays such as relay 420. In still other cases the route relay may require a combination of the information from a code lead, the digit dialed into the trunk and also the first I digit dialed into the sender to determine its operation. For example, in case the trunk appearance is in the bank of a third selector, it is apparent that the route relay such as 423 may be operated directly from the code lead since the subscriber has dialed the entire three digits of the ofhce code designation which will determine the route relay to be operated. When the trunk appearance is in the bank of a second selector and all the code digits are required to determine the route, then the code lead will be cross-connected at the rack 426 to the winding of a trunk trans-- requiredto determine the route, then the code e 316 are associated withthe trunk-identifier-com' nector circuits so that'the code leads from the 1 sleeve relays, suchas lead 2! 2, which'are associated with the same route appearance can be connected together. The only code leads brought through the connector circuits are those required for separate routes. The code leads entering the identifier'a nd terminating on the cross-connectlead of the first selector appearance will be crossconnected over the rack 426 to the winding of a trunk code translator relay, such as relay 420, thereby causing its operation when battery is applied over such code lead and through the operation of one of the trunk code register relays- I 400 to 409, battery will be connected through resistance 43! to one of ten conductors multipled before the contacts of the trunk code translator relays and connectable through the operation of one of such translator relays to a terminal of the cross-connecting rack-430, cross-connectedto the winding of one of thesender code translator relays such as 4.2 I, thereby causing the operation of one of-such translator relays. The sender code register relays M0 to 4| 9 are operable over the identifier connector in accordance with the setting of the first dial impulse receiving register of the sender and the operation of one of these relays will connect battery through resistance 432 and over contacts of theoperated relay of the sender code translator group, for example relay 42I, and terminals of the cross-connecting.

the winding Zack 433 to the proper routerelay, for example,-

The functions of the route relay are as follows To inform the sender whether the called office code has two or three digits; whether a repeater is required at the tandem point and whether the called office code should be, prefixed by a one or two digit repeater code in setting up the connection to the wanted ofilce; whether the sender relay should be added for those cases where either a six digit or a seven digit number may be dialed; to inform the sender as to the number of called o-flice code digits to be sent out by the sender in setting up a call to the distant point, since the-ticketing trunk may be a direct trunk or may terminate at atandem ofiice or at a partial tandem point; to send the three ofiice code digits to the sender or to control the sendingof those digits to the sender when they are registered'in the trunk or sender; to inform-the sender as to whether the firstdigit dialed into the sender is an ofiice code digit, a thousands or a hundreds digit and directly or in conjunction with the calling omce register relays of the identifier to inform the sender or the trunk or both, whether the ticketing of the call should bev cancelled or whether the route should be denied or whether a code has been dialed for which there is no existing ofiice. Since the present invention is not directly concerned with most of these functions of the route relay, only those functions of the route relay involved in reconstructing the calling ofiice code for use by the sender will be described herein.

It has been assumed that the trunk II3 has been seized over a bank level of the first selector I06 in response to the dialing of the first code letter M, that the second code letter A was registered in the trunk register and that the third code letter R was registered by the first register of the sender; It will be assumed that in response to the operation of the sleeve relay 206 and relays 2I3 and 3021 the code lead 2I2 indicative of a first selector level bank appeara'nce is extended over contacts 309 of 302F and code lead 3I3 to the cross-connecting rack 426 where it' is cross-connected to the winding of trunk code translator relay 420, whereupon relay 420 becomes operated in response to the application of battery 'to conductor 301. Since the second code letter A dialed by the calling subscriber has a numerical value of 2, the digit register 250 of the trunk has been advanced to register the digit 2 and after the operation of relay 3021 of the trunk-identifier-connector circuit, the setting of the register is transferred to the identifier and results in the operation of relay 402 (not shown) of the trunk code digit register comprising relays 400 to 409. Since the third code letter R dialed by calling subscriber has a numerical value of '7, the first digit register of the sender has been set to register the digit 7 and such registration is transferred to the identifier and results in the operation of relay 4I'I (not shown) ofthe sender code digit register comprising relays 4I0 to M9,

With relays 402 and 42.0 operated and assum-- ing that sender code translator relay 42I is crossconnected on the rack 430 for operation in response thereto, the circuit for relay 421 may be traced from battery, through resistance 43I over the No. 7 contacts of relay 402, over the No. 2 contacts of the translator relay 420, the strapped terminals of rack 430 to ground through the winding of translator relay 42 I. a With relays 4I'I LEI) and 42l operated and assuming that route relay 424 is cross-connected onthe rack 433 for operation in response thereto, the circuit for route relay 424 may be traced-from battery through resistance 432 over the No. 3 contacts of relay 4II (not shown), over the No. 7 contacts of the operated translator relay MI and the strapped terminals of rack 433 to ground through the winding of route relay 424. Relay 424 is thereupon operated.

It will now be assumed that the subscriber at substation I00 dialed the office designation DOW whereby an idle ticketing trunk is reached from a bank level of a second selector. the first code letter B dialed results in the setting of the brushes of the first selector I06 to a position opposite the third level of its bank, whereupon the brushes rotate to select an idle second selector, for example, selector I09. The second code letter O dialed" then results in the setting of the brushes of the second selector I09 to a'position opposite the sixth level of its bank Whereupon they rotate to select an idle ticketing trunk. It will be assumed that the trunk H3 is thus selected. In response to the dialing of the third code letter W, the register 250 of such trunk is set to register a digit value 9. With the trunkseized over a second selector bank terminal, a circuit is established over sleeve conductor II 8 for sleeve relay and in the manner previously described, an idle sender and identifier are seized and the identifier isass oiated with the calling trunk through the operation of trunk-identifierconnector relay 302F and trunk relay 2 I 3. When, thereafter, battery is connected at the identifier to conductor -I,'a circuit is established over contacts 308 ,of relay 302E, conductor 2I4, contacts of relay 2I3, the lower contacts of sleeve relay 201, code lead 2I5, across strapped terminals on cross-connecting rack 306, contacts 3I4 of relay 302F and code lead 3I5 to a terminal of crossconnecting rack 426.- This terminal is in this instance strapped to a terminal connected to the winding of an appropriate one of the trunk code translator relays, such as relay 420, and such translator relay is therefore operated. When thereafter the code digit 9 is transferred to the identifier, relay 409 of the trunk code digit register is operated. For convenience in illustration, it will be assumed that the translator relay 420 has been operated. Therefore upon the operation of relay 409, a circuitis established from battery through resistance 43'I, over the No. 7 contacts of relay 409, over the No. 9 contacts of relay 420- and thence over strapped terminals of,

the cross-connecting rack 430 to ground through the winding of route relay 425 which thereupon operates.

It will again be assumed that the subscriber at substation I00 dialed theoffice designation FIL whereby an idle ticketing trunk is reached from a bank level of a third selector. In this case the first code letter F dialed results in thesetting of the brushes of the first selector I06 to a position opposite; the third level of the its bank whereupon they rotate to select an idle second selector, for example, selector I09; The second code letter I dialed then results in the setting of the brushes of the second selector I09 to a position opposite the fourth level of its bank, whereupon they rotate to selectan idle third-selector, for example, selector III". The third code digit letter L dialed then results in the setting of the brushes of the third selector III opposite the fifth level of its bank, whereupon they rotate to In this case I level.

tacts 308 of relay 302F, conductor 2I4, contacts of relay 2I3, the lower contacts of sleeve relay.

In the manner previously de- 208, code lead 2I6, across strapped terminals on cross-connecting rack 306, contacts 3" of relay 302F and code lead 3I8 to a terminal of crossconnecting rack 426. This terminal is in this instance strapped to a terminal directly connected to the winding of a route relay, for example, route relay 423, which relay is therefore operated.

As before stated, the ticketing trunk may in some cases become seized over the bank of a rotary out-trunk switch. It will now be assumed that the subscriber at substation I has dialed the office code KRA whereby an idle ticketing trunk is reached over a bank level of the selector H2 and over bank terminals of the out-trunk switch 200. In this case the first code letter K dialed results in the setting of the brushes of the first selector I06 to a position opposite the fifth level of its bank whereupon they rotate to select an idle selector H2 of the divided level type. The second code letter R dialed causes the. brushes of selector I I2 to be raised to the seventh It will be assumed that the switchis arranged to operate its shaft contacts when the brushes are raised to this level whereupon the switch shaft is released to its normal position. The second dialed code letter is therefore absorbed and a brush selection is made as fully disclosed in the Wadsworth patent hereinbefore referred to, whereby upon the dialing of the lastcode letter A, the brushes are raised to a position opposite the second bank level and are then roupon the terminals of an idle outgoing or ticketing trunk. It will be assumed that the switch 200 and other similar switches are at the time standing on terminals allocated to the ticketing trunk I I3.

When therefore the trunk H is seized by the switch H2, a, circuit is established from ground at switch H2 over sleeve conductor I20 of trunk H5, over normal contacts of test jack 2II through the upper low resistance winding of sleeve relay 209, .over brush 203 to battery through the winding of relay 2I8 and in parallel therewith over the upper back contact of relay:

2I8 and through resistance 2!!! to battery. A

circuit in parallel with thewinding of relay 2I8 is also established over the-upper back contact of relay 209, over the interrupter contacts of magnet 22!], over back contacts of relay 22I to:

battery through the winding of stepping relay 222. Relay 209 operates but the winding of relay 222 being shunted by the winding of relay 4 The 1 i brushes of switch 200, therefore, remain in en- 2I8 and resistance 2I9 does not operate.

gagement with the terminals of trunk H3 and a dialing loop is extended from the calling line'over the established connection including brushes 20I It will be asand 202 of witch 200, through the windings of the line relay (not shown) of trunk H3 to cause the association of a sender with the trunk and to connect ground toconductor 223 to mark the trunk as busy. With direct ground connected to conductor 223, relay 2 I8 now operates if it has not previously operated, and sleeve rela 209 s held operated from ground on conductor 223, over brush 203, over the upper front contacts and through the lower winding of relay 209 to battery.- This marking ground is also connected over sleeve conductor I tohold the line finder I03 and selector switches I00 and H2 in their operated positions.

With direct ground connected to conductor 223', a circuit is established over the brush 203 of other switches of the same group as switch 200 whose brushes may be in engagement with the terminals'of the same trunk II 3, thence over the upper back contact of the associated sleeve relay, corresponding to relay 209, over the interrupter contacts of the stepping magnet 220 of such switch, contacts of group relay 22!, and to battery through the winding of the stepping relay 222 of such switch. Relay 222 thereupon operates .in turn causing the operation of the associated stepping magnet 220 which, upon operating opens the circuit of relay 222. Relay 222 then releases in turn releasing magnet 220. Thus relay 222 and magnet 220 reciprocally con trol each other to cause magnet 220 to advance the switch brushes step-by-step until an idle outgoing trunk is encountered, at which time the brush 203 will find no busy ground and the switch brushes will be arrested in engagement with the terminals of such idle trunk. In this manner, all out-trunk switcheswhose brushes are engaged with the terminals of trunk H3 are ad.-

vanced to presele'ct other idle ticketing trunks.

Following the seizure of an idle sender and the association of an idle'identifier therewith, the trunk-identifier-connector relay302F and the trunk relay 2I3 are operated and a circuit is established from battery connected at the identifier to conductor 301, over contacts 308 of relay 3021 conductor 2I4, contacts of relay 2I3, brush 204, the lower contacts of relay 209, brush 205, code lead 224, across strapped terminals of cross-connecting rack 306, contacts 3I9 of relay code digits to the sender using five leads for each digit, two out of each group of five leads being'grounded in each case. If allthree code digits were dialed to reach the trunk as indicated for example by the operation of route rela 423 as previously described, the upper Nos. 1, 2 and 3 contacts thereof which are connected to terminals on cross-connecting racks 428and 429 will be cross-connected to the win-dings of relays of the first code digit group 440 to 449, of the second code digit group 450 to 459 and of the third digit group 460 to 469 for operating relays of these group corresponding to the three code digits dialed; Each of these relays is arranged upon its operation to connect ground to a'pair of terminals in the associated cross=connecting rack. Rack 434 is associated with the relays of group 440 to 449 and has five terminals in which terminate the group 435' of five conductors over I ascaoea which the first code digit is transmitted to the sender and to which terminals the other pairs"v of terminals of the rack are cross-connected in,

the proper combinations of two for the ten values of the first code digit; Rack 439 is associated with the relays of group 459 to 459 and has five terminals in which terminate thegroup 431 of five conductors over which the second code digit Rack 438 is associated with the relays of group.

469 to 469 and has'five terminals in which terminate the group 439 of five conductors over which the third code digit istransmitted to the sender and to which terminals the other pairs of terminals of the neck are cross-connected the proper combinations of two for the tenvalue's of the third code digit. To reconstruct the dialed office code designation FIL, which resulted thereof i established tobattery through the winding of relay 465 (not shown) of the group 489 to 469 to cause the transmission'of the third code digit to the'sender. I

If the entire office code cannot be sent from the identifier to the sender by the route relay and the third code digit has been registered in the trunk and transferred to the trunk code register comprising relays 499 to 499,-a route relay such as 425 will be operated as previously described and will cause the first code digit to be transmitted under its control through the operation of one of the relays of the group 449 to 449, the second code digit to be transmitted under its control through the operation of one of the relays of the group 459 to 459 and the third code digit to be transmitted underthe control of one of the trunk code register relays of the group499. to 499. In the case previously assumed, whenthe calling subscriber dialed the otlice designation DOW, the ticketing trunk was seized over a. bank level of the second selector and the route relay 425 was operated. In this case upon the opera- 3 tion of relay 422, a circuit is established over? the upper No. 2 contacts of relay 425 and over a strapping on cross-connection rack 429 through the winding of relay 443 (not shown) of the group 449 to 449 to battery to cause the transmission of the first code digit 3 to the sender, a circuit is established over the upper No. 3 contacts, of relay 425and over a strapping on cross-connecting rack 429 through the winding of may- 455 (not shown) of the group 459 to 459 to battery to cause the transmission of the second code Y digit 6 to the sender and a circuit is established over the upper No. 4 contactsof relay 425.-.'over a strapping on cross-connection rack 428 to battery through the winding of relay 419. Belay 419 upon operating connects ground over its contacts and the Nos. 1 and 2 multiple contacts of the trunk code register relays 499 to 499, the co operating contacts of which relays terminate in pairs of terminals on the cross-connecting rack 41! which are cross-connected to the proper oombinations of two out or five terminals connected to the conductors of group 439 for the ten values of the third code digit. In the case assumed trunk code register relay 499 has been operated and consequently the digit 9 is transmitted to the sender as the third code digit.

In case the second code digit dialed was registered in the trunk and transferred to the trunk,

code register relays 499 to 499 and the third code digit dialed was registered in the sender and transferred to the sender code register relays 4l9 to 4L9 in the manner previously described as when the subscriber dialed the ofiicedesignation MAR, the operated route relay, as for example, relay 424" would cause the transmission 01' the first code. digit to the sender through the opera...

tion of one of the relays of the group 449 to 449 in the manner previously described, the second code digit would be transmitted under the control of the operated relay of the trunk code register group 499 to 499 and the third code digit would be transmitted under the control of the operatedrelay or the sender code register group 4 H! to 4 I 9. In the case assumedwith route relay 424 oper-l ated, when relay 422 operates a circuit is established from ground over the upper No. 8 contacts of relay 424 over a strapping on cross-connection rack 429 through the winding of relay 448 (not shown) of the group 449 to 449 to battery to cause the transmission of the first code digit 6 to the sender and a circuit is established over the. upper No. 4 contacts of relay' 424 over a strapping on cross-connection rack 428 to battery through the winding of relay 412. Relay 412 upon operating connects ground over its contacts and the Nos. 3 and 4 multiple contacts of the trunk code register relays 499 to 499, the correspending contacts of which relays terminate in pairs of terminals on the cross-connecting rack 473 which are cross-connected to the proper com.

binations of the conductors of group 437. for the winding of relay 414. Relay-414 upon operating connects ground over its contacts and theNos 1 and 2 multiplecontacts of the sender code register relays 4 l 9 to M9, the cooperating contacts of which relays terminate in pairs of terminals on the cross-connecting rack 415 which are crossconnected to the proper combinations of the conductors of group 439 for the ten values of the third code digit. In the case assumed sender code register relay 4!! (not shown) has been operated and consequently the digit 'lis transmitted to the sender as the third code digit. 4

The identifier will always transfer the digit registered in the trunk code register comprising relays 499 to 499 to the sender jsince in some cases this digit may be the thousands digit as when the ticketing trunk has been seized from the third selector level. and the sender will thus require this digit in establishing the connection and in transmitting information to the ticket printer. Therefore when relay 422 operates, ground is connected over its upper contacts and the Nos. 5 and 6 multiple contacts of relays of the group 499 to 499, the cooperating contacts of connected to the proper combinations of the conductors of group 411 for the ten values of the digit dialed into the trunk.

: As previously stated, each route relay upon operating performs other functions fully described in the application of Gpoderham hereinbefore referred to, but since. the performance -of such functions does not directly concern the present invention, the apparatus by which they are performed 5 has not been disclosed nor described herein. 1

" What is claimed is:

1. In a telephone ystem, a, calling line, a train of selector switches, a trunk over which connections may be extended to any one of aplurality of offices having a plurality of branches accessible respectively from bank levels of different switches of said train in response to the dialing of one or more of the ofiice code digits of a wanted line number, a relayindividual to each branch of said trunk and operable upon the seizure of said trunk over said branch, means for registering all of the oflice code digits dialed in establishing a connection with any branch of said trunk, a

plurality of circuits for controlling said register ing means controlled respectively by said relays, and means operative following the seizure of said trunk to complete that one of said circuits which appertains to the branch over which said trunk was seized whereby the digits dialed to select said branch are registered by said registering means.

2. In a telephone system, a calling line, a train of selector switches, a trunk over which connec-'-- tions may be extended to any one of a plurality of offices having a plurality ofbranches accessible respectively from bank levels of diiferent switches of said train inresponse to the dialing of one or more of the office code digits of a wanted line number, a relay individual to each branch of said trunk and operable upon the seizure of said trunk over saidbranch, means for registering all of the ofiice code digits dialed in establishing a connection with any branch of said trunk, a plurality of circuits forcontrolling said registering means, each of said circuits including a relay indicative of-a branch of said trunk, and means controlled by an operated one of said first relays to control the operation of the proper one of said latter relays whereby the digits dialed to select said trunk are registered by said registering means.

each one of whichco'nnections may be-extended to a plurality of offices and each of which has trunks and operable upon the seizure of a trunk over that particular branch, means for re istering all of the ofiice code digits dialed in establishing a connection with any branch of any trunk, a plurality of circuits for controlling said registering means each of said circuits including a a relay indicative-of a different called ofiice route, and means operative upon the operation of one of said first relays to selectively complete a circuit including one of said latter relays whereby the digits dialed to select a trunk are registered by said registering. means. I 1 5. In a telephone system, a. calling line, a train of selector switches, a plurality of primary trunks accessible respectively from'the bank levels Iof'selector switches of said train in response to the dialing of one or more of the ofiice code digits of a wanted linenumber, each primary trunk terminating in a secondary trunk selecting switch, a plurality of outgoing trunks to which said secondary switches have common access over each one of which connections may be extended to a plurality of oflices and idleone of which are normally preselected for seizure, a relay associated with each primary trunk and operable upon the seizurethereof, means'for register ing the oflice code digits dialed in establishing a connection with any one of said outgoing trunks, a plurality of circuitsfor controlling said registering means, each of said circuits including a relay indicative of a different called office route, and means controlled by the operation of one of said first relays to selectively complete a circuit including one of said latter relays whereby the digits dialed by a calling subscriber to select a 3. In a telephone system, a calling line, a train of selector switches, a plurality of trunks over each one of which connections may be extended to a plurality of oifices and each of which has a. connection with any branch of any trunk, a

plurality of circuits for controlling said register;

ing means and selectively controlled by said relays, and means operative following the seizure of any one of said trunks to complete'that one of "sai'd'cireuits which appertains to the branch over which said trunk was seized whereby the digits dialed to select said branch are registered by said registering means.

primary and-a preselected outgoing trunk areregistered by said registering means.

' 6. In a telephone system, a calling line, atrain' of selector switches, a plurality of primary trunks accessible respectively from the bank levels of selector switches of said train in response to the dialing of one or more of the office code digits of a wanted line number, each primary trunk ter-' minating in a secondary trunk selecting switch, a plurality of outgoing trunks to which said secondary switches have common access over each .one of which connections may be extended to a plurality ofoffices and idle ones of which are normally preselected for seizure, a relay asso- I ciated with each primary trunk and operable un- 4. In a telephone system, a calling line, a train of selector switches, a plurality of trunks over I der the control of the outgoing trunk associated withsuch primary trunk, means for registering the ofii'ce code digits dialed in establishing a connection with any one of said outgoing trunks, a plurality of circuits for controlling said registering means, each extending over contacts of one ofsaid secondary switches and controlled'by the relay associated with such secondary switch, each of said circuits beingindicative of a different called office route, and means operative following the seizure of an outgoing, trunk to complete that one of said circuits prepared by an operated relay whereby the office code digits dialed by a calling subscriber to select a primary trunk and a preselected outgoing trunk are registered by said registering 'means' MARCELLUS s. MCDAVIT'I.

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