US1757564A - Telephone system - Google Patents

Description

May 6, 1930. H. M. FRIENDLY TELEPHONE SYSTEM Fild June 18, 1923 4 Sheets-Sheet 1 xii &1

Invenlur- May 6, 1930 M. FRIENDLY 4 TELEPHONE SYSTEM Fil ne 18 19 23 4 sheets -sheet 2 I IiWentnr- H Elh arl-P'I-Friendly y 6, 1930. HIM. FRIEN LY 1,757,564

' TELEPHONE SYSTEM Filed June 18, 1923 4 Sheets-Sheet 3 Invenmr H. 5 v HEPhEPH Ifi'iBHmLI May 6, 1930." H.. M. FRIENDLY TELEPHONE SYSTEM Filed June 18, 1923 4 Sheets-Shqet 4 q q A ll mmw m m W g mmu w ..,||Y

E 2mm mm NNV R? q W S a? Inveniur- Herb efl-P'I-m m m em u: 1\. cu m E Patented May 6, 1930 ice,

HERBERT M. FRIEND-LY, or PORTL ND; onneoiw TELEPHONE sys rnir Application filed June 18,

My invention relates to automatic or ma chineswitchin telephone systems; and Variations thereof. It concerns the signalingcurrent supply switching mechanism and tl'ie cross-connecting of the central office equip ments with relation to the'outside lines. 3 l 7 "An object of the invention 18 to enableany desired character or harmonic frequency of signaling'eurrent to be applied through the connector with specific reference to the line selected when the line is an individual line; Where the line selected is a party line itWi'll have as many ofiic'e b'ranchesas there are signals on the line. The latter statement is to say there will be an ofice branch and cor-t responding telephonenuinber for each station on the outside l1i1e,-haV1ng in mind that there branch having a distinctive telephone number 'andan' interchangeable associated sigi1a1- ing current character orharinonio frequency.

This provision of the inventionenablesany desired type or characterofsignaling current and correspondingly responsive signal device to be employed for an individual line Without changing its calling number." It alsoenabl'e's any plurality of types or characters of sig-' naling current-andcorrespondingly selectively responsive signal de'vioes'to'be employedon a party line without changing any calling numbers for any of the respective subscribers thereof. And it also enables any one or more codes of signal current application to be made" toa line, selectively or non-selectivelyeii'ective to a correspondingly responsive signal device or deviceswithout changing any cell'- .ing numbers for any of therespeotive subscribers thereof. l r a A salient object of the system is, the means lines-may be interchanged and altered withoutchanging the calling numbers of the concerned subscribers wherein the type or char-, acter of the'signahng current and the signal device of thesubscriber-or subscribers concerned are or are not. changed incidental to the changed grouping; 'lhat is to say,-the

present system contemplates broadly the interchanging or introduction of subscribers c confusion-1 with other codes employed upon the concerned-line. a whereby the subscriber: grouping on party 1922;; siege it; eieiiaif- V I signaled'i vhen' onlyone o r'flthe other is may be a'plurahty of central oilice branches I r for any desired statlon on thehne; each said the signaling currentso projectetlbeiiig inter cli'arigeably specific to the s'aidbranch; but applied throughthe said conn'eetor;

Another object of the invention is to pro- -vide a connector switch automatic control v whereby when a branch of a line" is seized which=contemplates that code signals comprising a plurality of spaced applications of si nalin'g current will be impressedythat the said-applications will initiate only; at the initial" period of the code." That'is to'say,

code current Will not be" applied initially after the code' per iod' has be'ggun and which would thus'c'ausefragmentary code signals to be applied out upon the line, possibly causing Patent No. 1,565,727, granted December 15, 1925. The present system also relates to the system disclosed in my application Serial 7 No. 138,149, filed December 21, 1916, and issued as U. S. Patent 1,561,710, granted November 17, 1925. It therefore, comprehends a system with the objects of the said filedapplications as functions thereof. i V

The present system thus involves a crossconnecting means whereby any available signaling current supply may be interchangeably associated with the set of connector.

bank terminals corresponding to a line or branch of a line so that when the said set is seized by the connector the connector will re-' ceive the prearranged signaling current supply and impress it upon the talking terminals of the corresponding line orbranch thereof seized. It also involves a cross-connecting means wherebythe h'nemay. be interchangeably branched to any desired connector bank terminal set, or likewise branchedto any plurality thereof in order that the line may be vreached over any desired set, of connector bank terminals, orover any set of any desired interchangeable plurality of connector bank operating connector banks D for connector A,

7 together with the wipers and cooperating ister.

connector banks B and C of two connectors (notshown) belonging to the group containing connector A. a a

Fig. 3 shows signalingcurrent supply apparatus and signaling current interchanging terminals cooperative with a bank level of the group containing connector A' and the multipled connector bank levels B, C and D.

ing lines from the outside with relation to the sets of terminals E in Fig. 2 of the central oifice equipments. 7 f The circuits employed to illustrate the invention may beassembled by placing Fig. 3 below Fig. 1, andFig. 2 below Fig. 3 so that lines extending to the adjacent margins reg.-

, With further may be considered as A, C andE respectively,

in the Patent No. 13,901re-issued to Frank Newforth, J r.,'April 13, 1915. The connector A is a well known form of connector switch as shown in Fig. 4 of the said Patent No.

7 1,565,727, however, modified to operate in ac- "cordance with the present invention. This modification is resident in the, introduced right-hand .relay and associated'circuits', as will be discussedhereinafter; i V

Fig. 4 shows the method of cross-connect In Fig. 3, the ringing current interrupter devices F, G, H, I, J and K are of the general type as the interrupter shown in Fig. 1 of the patent granted July 4, 1916, No. 1,189,882 to H. F. Obergfell. A group of these interrupters is common to a group of'connectors or all of the interrupters may commonly serve an additlonal group or groups of connectors.

In the present eXampled system, interrupter G is shown as controlled from eitherof the two groups to which relays L andM :refer. l/Vhen'the connector A (or any connector of the group containing said A) seizes a line terminal set in its line terminal bank the common start conductor 101 will become extended through armatures 102 and 103 to grounded battery; This latter function, as will appear presently, willcause the. relay L to actuate and the interrupter devicesF, G, H,I, J and K to start functioning. As the brush 3010f interrupter F, forexan1ple,is drawn upward no operative eifect occurs with'reference to the signaling current source 7, but the relay corresponding to 128 of any and every connector applying battery from its armature corresponding to 103 to common conductor 101 willbe en-ergizedfrom battery on contact 307 over brush 301 and contact 308. Said relay (or relays) l corresponding to 128 will be locked to common conductor 101' to close the conductor 218 of the concerned connector to the resting contact of its armature 136 to prepare for applying signaling current from source f through said armature 136 to the line seized by the connector. However, as the brush 301 recedes, following the breaking of the energizing path of the solenoid F in the manner set forth in the said cited patent to Obergfell, the five lower contacts at the left will be successively grounded through the brush 301,.bar 302, spring 303, armature 304 to ground. This willcause relays as f and f" to successively operate to apply the source f through armature (or armatures) corresponding to 135 to the line called fromtheconne-ctor (or the respective connectors) having its re lay corresponding to 128 looked, as will ap- V pear presently; It will appear presently that reference to Fig. 1, the telephone T, lineswitch LS and first selector FS' upon a response being obtained from a line called, thering cut-oil relay corresponding to 105 will actuate and lock in the well known manner, incidentally opening the grounded some'other connector, the plunger-rod operat- 130 i ing the brush30l will continue reciprocating in: the'manner as set forth in thesaid cited patentvto Obergfell.v The relay 7 is connected to the fourth from the'bottom contact tacts 307 and 308' adapted to vbe coincidently engaged-by the brush 301 in: the v upward stroke. In this connection, it will be under stood that the other conta-cts'(310 for example), lead toirelays as 7'' corresponding to relay f, respectively. The armature of relay f leads to a-set Of common. interchanging terminalsof adiiierent; connector bank level (not shown), connected c'orrespondinglyto the conductor 312 leading from the armature of relay f; It will be-understood that the conductor 312 and other correspondingly situated 'conductorsof relays 9,, 7a., 2', f, and is may serve any plurality of connector bank levels and cooperating connectors. For ex-:

ample, ifthe' installation "consists of five hundred connectors and respectively 6001361- r l/ I at-ing banks, the relays f and 7 may eacn serve one-hundred connectors wherein thesig na-ling current willbe periodicallyiapplied to the respective groups successively nf cor respondence with the recession of the brush 301 over the contacts305 and 310 in the mannerlset forth in the said patent to Qbergfelll- The up and-down reciprocation of the'brush 301 will continue'as long as conductor 101;is

applied to grounded battery by a connector 101. I I a a The signaling current sources f, g, k, 2,7 and 7c are preferably alternating. current,

of the group commonly related toconductor though possibly pulsating current, for exfill ample; having a definitefrequency or periodicity for harmonica-11y selectively operating line signal bells-or other signal devices. The respective frequency of the said sources f, g, h and i may be conveniently assuniedas 16,33, 50 and 66 cycle. The sources 9' and ic 'may be any said harmonic frequencies or they may. be of any type of suitable signaling current, respectively. However, it will benoticed that while the relaysf, g, h and d are similarly connected'with relation to a single contact on their respective interrupter, the

relays j and 7c are multiply connected to a plurality of contacts on their respective interrupter. Inthe case of relay j it is con- The sources f, g,h' and dare currents nected totwo narrow contacts, with a wide contact nterspersed between the narrow contact-s. It will thus appear that asthe brush- 313 recedes, it will. cause the relay 9" to attractits armature briefly and'then prolongs Q ed'ly and then hrieflyi: This-' will cause short, long? and short application of source 3' to conductor 31%;111 the sameman-ner, five" short applications of source k wil-l'occurto conductor 315 ioreachrecession ot bru sh317.

The ten sets oiiniiie interchangingtermrnals correspond to the first to the tenth banka contact positions of the level shown iniFig; 2, which maybe conveniently assumed to'be the first oft-normal level of the bank'of -pos-' sibly teir levels of bankterminals ofacon nector Aand associatedgrou ofconnectors.

The numerical designations lto: 10): below the sets of terminals refertc the; correspond-- ing numericalposition in the bank'leveliconcerned, there being a set of nine: interchanging terminals for each connector bank -posi-i tioii. t will appear presently that the si=g= naling conductor, as 319 to 328 may be inter changeahly connected with-.thearmat-ure of any relay 7', g, h, i", j andaJc. by. electrically tieing proper adjacentterminals of the set of terminals corresponding to the'conductors 3'19Ito theset of terminals correspondingito the conducters 3191to; 328: This may bedon'e' by fiexing the ends of' the desired t6III11-" 'nals into contact and applying solder thereto; It will be understood that any other method oi interchangeably connecting the conductors 319 to. 328 and the conductors leading to the answer the requirements of the present 111- vention, such for example, as employing'so called jumpers. i y I a ln Fig. 4, the ten sets or"- 'ter miiials E atthe extreine leit are the correspond ngly designated ten sets showniii Fig. 2',- and are numericallydesignated 1 -10 to index the corresponding Jbanki position' in the banks B,

7G and D to v which they: multiply connect. Tlie'said sets 01 terminals E'are located on the' intermediate distributing frame (designated D.- F.-in Fig; 4.), there being sets ofcable conductors extendiiigther'eto from the cor-re spond ng sets of bank terminals" shown in" Fig. 'The'two sets of three terminals4t01- and 402 areona jumper branch block-on the I. D. F; The vertical row offiv'e' sets'of three terminals design'atedP are, located on the I. 'D. F. From each setvofterminals P a set of three cable conductors extend to a corresponding individual lineswitch 111th cated by a large circle. The two heavy lines leading to the lineswitchcs are talkingcon-' "ductors, while the light lineis the so-called private normal conductor; That is, the said heavy'lines correspond to conductors 123 and 124, and the said lightline correspondsto conductor 50 o'fivFig. 1 of the cited patent to latter said patent.

lineswitchemployed is vvnotlimited to the general type shown (designated C) in the terminals onfthe correspondingterminal sets P and Q, on the I. D. F. and M. ,D. F., re

spectively, while the private normal conductor fromthe respective line switches terminate in a so-called .private? terminal on the I. D. F. companion to the: terminals of the corresponding talking conductors 9 leading from the respective lineswitches.

The outsidesubscriber lines respectively lead-inby cable as a pair of talking conduc- I tors and terminate in corresponding pairs of s c-called line terminals onthe. M. D. F. in

the well known manner. V The I. D. F. thus has a set of three terminals (two talking andone private normal) for each connector bank number in the central ofiice, having inmind that each said number may be reached through a plurality of permanently multipled bank terminals, possibly ten, three of which are shown in the levels designated B, C and D respectively, in Fig. 2. The setof terminals E thus shows terminals of' ten connector bank lines belonging to a single level of ten line bank positionsof a connector bank, which level, of course, may have. any plurality of line bank positions (other than ten shown) per level and any plurality of levels; possibly ten levels. The

I. D. F. also has a number of so-called branchblocks-(as contain. terminal sets 401, and 402) normally 'disassociated. :The I. D. F.

further has a set of three terminals (two talking and one private normal) for each lineswitch of the. central ofiice, having in" mind there is a corresponding set of arrester and heat-coil terminals on the M. D. F. for each said lineswitch and its said terminals on the ID. F. 1

The M. D. F. thus has a set of two talking so-called arrester terminals for each line switch of-the central oflice,and.-a -pair of.

talking so-called line terminals for and corresponding to each cable pair radiating from the central .ofiEice for subscriber use. The M. D. F. may also contain line terminals for other uses; such as inter-oflice trunks, for example. However, the present invention is primarily directed to the means for lnterconnecting inside or oflice subscriber equipment to subscribers lines, so auxiliary equip ment elements are omitted in order to simplify the disclosure.

'It will be noted herethat the temporary conductors or jumpers on the'I.-D-. F. each constitute a set of three conductors, viz., two talklng conductors and a prlvate' nor-- mal conductor. Also, that the jumpers on the M. D. F. each constitute two talking conductors only. It will, of course,be understoodthat while an I. D. F. and a M. D. F. have been referred to, a single cross-connectingframe may be employed embodying the elements described as located on the two said frames, and moreover, the method used in carrying out the objects attained by the present invention may be modified as to cabling, jumpering, and the relative disposition and organization of the temporarily and per-- manently associated elements without departing from the scope of the invention as defined by the appended claims.

The general organization of the elements of the system contemplated in the present invention having been set forth, detailed operation of the system in certain assumed calls will .be described.

Assume a call from telephone T to tele-v phone 105 (shown as a polarized telephone bell for simplicity) on individual line 1, the

telephone number of which is 1112. Upon initiating the call (by removing the receiver) at telephone T, thelineswitch LS will operate and seize the first selector (assumed to be thefirst idle one accessible), the latter said selector being thereupon in condition to respond to the first digit 1directly transmitted from the calling device 110. Uponthe calling device 1101being operated, the selector FS will responsively operate and select connector A (assumed to'be the first idle one accessible), in the well known manner, in view of the citation;

' In this connection, it will be understood thatin place of a single selector. FS beingintermediate of the lineswitch LS and connector A, there may be two or more selectors adapted to be interlinked in tandem, de-A pending upon the numerical order capacity of the system. However, since employing a plurality ofselectors as'links ina tandemed connection is not 'new in the art. the curtailed representation in Fig. 1 will be clearly understood as exemplary of the invention'in its application to exchanges of all subscriber and numerical order capacities the exa'mpled' system having three numer cal The connector A being well known inthe art, so far as the directive control elements thereof are concerned, the operation of the line relay 112, release relay 113, series relay 11 1, vertical magnet VM,*off-normal spring set ON, private magnet (designated Priv. M.), side switches and 116, rotary magnet RM, busy relay 117, ringingrelay 120, ring cut-off relay 105, back-bridge relay 122, release magnet (designated Rel.'M.),' will be fully understood, and therefore need not fur-57564 bedetailedr Sufiice it to say, however, that upon the shaft of connector Abeing operated responsive to the last two digits 12 of the called number, its wipers "211 to 214, in Fig.

2 will become setupon the second set of bank contacts of the bank level D. Assuming the said called'line to. be idle, the relay 120 will actuate, in the well known manner, .and ground willbe applied through sideswitch wiper 116, ccnductcr 124i, wiper 211, engaged bank contact, conductor 216,1. D. Luterminal 217, conductor ofjuinper 406,1. D 1

terminal 107, private normal cable conductor lcadingto the cut-off relay otthellneswitc'h 408. This will be effective tot-he saidline switch to disconnect or 'cut-oii the linerelay thereof from the talkingconductors leading thereto, in the welllmown manner.

Consequent to the said actuation of relay 120, a circuit path can be traced from grounded battery, 'armatures 103, 102, conductor 101 y and throughtlthe winding ot relay L- to' ground, the latter said :relay actuating- A circuit path can now be traced from grounded armature 304150 the inultiple'dwindingsoil the solenoidsofthe interrupter devices F, H, LJ and K. A circuit canialso be traced from grounded armature:330 to the winding of the solenoid of interrupter G. The said interru'pt-ers will be thus caused tostart operating in the manner explained in relation to inter- 1 rupter F. 1 w M 1 V i t will be noted that the second and third from the top) interchanging terminals of thesecond set (from the left) are electrlcally tied (by soldering, iorexample) so that a carcuit path can be traced from contact 331, armature of relay 9, common conductor 332,-tie 333,conductor 320, bank contact and wiper' 212, conductor 218, make-before-break spring 126, winding of relay 128, armatures 129 and 130 to' ground. The relay 128 is designed (through the employment-of a. core shield or otherwise) toha-ve the characteristic of relay 105 wherein it will-operate from sus-' tained direct 'current,.but willbe nonopera tive to alternating current, or to brief appli-;

336 will operatively energize the. relay 128 over the'tracedpath. A locking path torrelay 128 can now be tracedfrom spring 126, arinatures 131, 102, 103'to 'groundedbattery,

the contact upon which spring 126 normallyv rests being now disengaged, The lower pin 337. on the plungerirod carryin brush 335 striking spring 333 will disengage the spring upon which spring 338 normally rests and the latter spring engages the spring shown above, so that the ground from armature .330 will now b'elapplied to the bar 339 and the energizing path for the solenoid of interrupter Gr will bebroken-so thatthe brush 335 will start receding; its left-hand end'su ccessively engaging the contacts while "the right-hand time brush been stated with re-ferenceto relayj. =Duringthe time relay g is actuated, ringing cur rent from source 9 Wlll he applied through armature of relayg, conductor 332, tie 333, conductor -320,fbank contact and brush 212,. conductor 218,;arrna'tures 135, 136, 137, con- .ductor 140, wiper1'213 and-engaged bank contact,;terminal 220, =talki ngconductorof jump,- er l06, terminal, 110, cable conductor 4:12, arrester terminal 413, lower conductor of line 1, condenser and bell 405, upp'er line conductor, terminal e17, corresponding conductor'of ju1nperf4e15, arr-ester terminal 419,1Cabl cons end slidingly engages the bar 339. At'the 3'35 engagescontact- 340, relay 9 will become energized inthe manner as has j .dllCtOifilQQ, terminal 121, corresponding conductor oi jumper 406, terminal. 223, arm'ae tures 1 12, 143, inner winding ct -relay 1105 to grounded'battery. The bell beingre sponsiveto thecurrent from source-g will operate, while the'relay 105 will not oper- 'tively en'ergiZeflThe interrupter device Gr will continue to. reciprocate its brush 335 as long-I asi conductor 101 remains applied to grounded battery, an application ofthe source .9 over the traced path including bell 405 cccurringeach time the brush335 engages con-- its attraction, because ofbar 33'9 being*dead under 'thef'attracting condition as spring 338 is thenaresting-as shown in the drawing.

- In this-connection, attentionis directed to y the fact that if relay 120 inconnector A actuates after brush 335 has left-bank contact 331 in receding (common conductor 101 having beenbetore applied to groundedbattely by some other connector of the-group containing connector. A) the actuation of relay 9 W111 have no operativeyeffect on the bell 405, due

to relay 12 8 beingnormal, though relay jg may'apply current fromfsourcej g to another bell through a connectorof its group having operatively seized a line before brush .335 left contact 331 in its downward stroke in the manner described. Under the last stated condition, signaling current from source g will findits way over the traced path includingthewinding of relay128 to 'grounded'armature 130, but clue to the stated characteristic of relay .128 it {will not-operatively respond to-thesignaling current source g,orother sig- .nahng-current source,.-such as f, h, i, y and 7c. The resistance ofrelay 128 is preferably high, so that it-willnot abstract an objectact 340: during its recession, :bllt not during .tionable drain of signalingcurrent from the applied source, and moreover, the ground pathf'strom armature may include a retardaticn coil (not shown) common to all the connectQrsfof-thegroup containingconnector A to further bar or suppress the signaling current from the source being applied.

- Upon a response being obtained on the called lineby the removal of the receiver from the switchhook of the telephone indicated by bell 405, a conductive path will be closed including grounded signaling current source and the inner winding of relay105, causing it (relay' 10,5) to actuate and look its outer winding through armature 145- to grounded lower off-normal spring, incidentally grounding theuppe'r terminal of the lower winding ofback-bridge relay 122. I Relay 122: will actuate in the well known manner and arma ture 103 will-remove grounded battery'from conductor 101,having in mind conductor 101 may remain applied to 'battery'ironi some other connector armature corresponding to 103. Due to the armature1 attracting. the,

relay 128 will become unlockedjregardless of the state of conductorlOl. The'relay 122 will operatively energize'through armatures 136 and143 and the traced pathincluding the receiver of telephone on line 1.- The calling and called telephones are now in talking connection. "The restorationof the; COI1118C,

, tor concerns'well known circuit paths and though" if non-har1nonic,,it may be univere elements and therefore need not be detailed in imparting a clear disclosure.

Assume that-in the described call the tie 333 is transferred orinterchanged to the fourth and fifthterminals in lieu of the second and third as shown. The source it will be applied by relay h in lieu of source 9 by relay 9. In the present assumed case, the bell 405 will require changing, provided it was selectively responsive to the source 9,

sally responsive to the signal current, and therefore responsive to the "current from source b;

v Assume that the tie 333' is interchanged to g conductor.315,the presentassumed tie, conbetween the two-terminals lowermost, inlieu of the second and third,-as shown in the drawing. The source 71; will be applied by relay k in lieu of source 9 by relay 9. In'this connection, it will be noted that while the topmost left-hand terminal 341 engageable to brush 317 leads to'the resting contactofthe armatureofrelay it and thecorresponding V right-hand contact 342 leads to grounded battery, simulating the arrangement of the interrupter G, the winding of relay lcfism ultipled to the five contacts consecutively below contact34l, Thus, as the brush 317 recedes after its lower pm 343 engages and operates the spring 344, the ground from armature 304 will be applied throughspring 344,'bar 346, brush'317 to the successively engaged contacts below contact 341, efl?ect ivet0 vibrate the armature'ofrelay five times, therebycorrespondingly applying and disconnecting the signal current source with respect 1 to ductor 320 and over the before tracedpath to to its stated design. Upon the brush 317 beground at armature 130 if it is assumed that the concerned connector relay-120 actuated-- after brush 317 receded from contacts 341 and 342. However, the relay 128 willnot be operatively afi'ected by the said current, due

ing next moved into engagement with contacts 341 and 342, the grounded battery at contact 342 will be applied through the armature of relay 70 and over the traced path includingthe winding of relay 128 to grounded Varmature'l30, causing relay 128 to actuate and look, as described. This will prepare the signaliligcircuit at armature 135, so when the receding brush 317 successively grounds the contacts attached to the winding of relay current, from sourcelc, a code of five bells, j

so-called, willensue. Ittis thus clear that since the brush 317 must engage contacts 341 g and 342, in orderto close the signaling circuit a at armature 135 it will be impossible to initi-, I

ate the application of code signaling current from any'connector at any period other than the initial period of the code. And it will also a i be clear that regardless of the numberot con-' nectorsflsimila-rly related for signaling with reference to the interrupter device, the respective connectors will remain disabled from i applying signaling current-until the first engagement of brush 317 with contacts 341 and 342 after the seizure of the concerned connec tor by the actuation of its relay corresponding to relay 120 to complete the ground path from thelower winding'terininal of the relay therein correspondingto relay 128. The removal of grounded battery irom conductor 101 bythe attraction of armature 103 will de loo 1 energize relay L,consequent to the-response onthe called line, as before described,having in mind that conductor 101 may be maintained to grounded battery by another conthe seventh" and eighth terminals in lieu of the second and third,- as shown .The source j will'become'related to conductor 320 as was source 70 in tlieilast assumeddescription. The

relay '7" has thesame dispositionand function with relation tothe interrupterJ as relay is has to interrupterK, having in inind'that the contact 348 .coversthe space, of three spaced contacts of interrupter K Thus,as the brush 313 recedes the relay 7": Will be caused to atv i i V tract its armature for a relatively long period:

intermediate of two short attracted periodsi 1 l Thiswill effect a code signal constituted of a V 110;. nector in seizedrelation whichhas not been j respondedto from its called line, though the v 1 i short, long and short bell to the called line. The function andobject of the contacts'352 and'353 corre'spondto that ofthe contacts 341*and 342. o

' It'is thought that the foregoing makes clear thefunctionii'ig oi the connectors and'the interrupter devices shown, having in mind there 7 may be anydesired plurality of signaling current sources or codes; only being shown for the purpose of illustration;

- The employment of the devices of the sys- I tenrwherein' party' lines are concerned will a 421' and 422 as apart oflthe concerned tele phones (not detailed), selectively responsive" to 16 cycles and 50 cycles, respectively," It

, bedis'cussed The party lines may have the i respective stations thereon signaled selective lyharmonioally or alternatively by code, or the signalinginayibe both harmonic and code,

as will appear.

Line 2-- has tw o harn' onic signal devices will be noted that a'jumper 425 is run corresponding to jumper 415 Since the outside cable conductors and the main franieelements are adapted tounive'rsaluse; that is,

yibe employedin individual line or in party line servicethey will be similarly, jUPIP- I ered on the MJDQ F. under either use. I-iowe ver,the line 21s a party line, havingtwo selectively s gnaled subscribers stations thereon, and the fact that thestation thereon designated 421 is reached by calling telephone number 1115 wherein -16-c cle si nallina'.

i J a t current is impressed from source f and the station designated 422 is reached by calling telephone number 1117 wherein -cycle signaliii'gcurrent is impressed from source 7i: In'orderthat the signaling characteristic of each of the telephone signals 421 and-422,

' andalsothe calling numbersof the saidtelephonesmaybe singly or bothchaiiged (in reg grouping," for example) without disturbir'ig thetWo-conductor umper 425 and the -un-' concerned tli'ree concliictor otherjuinper, a

ranch-block terniinal'set 101 is arbitrarily chosen towvh'ich'to run thethreeeconductor jumper 427; The branch-block 401 may have its three terminals arranged in nultipled gaiigs respectively", wherein when correa spending sets of lugs of the terminals are distinctively set. apart for'each current char acter it enables the junctioned jumpers from the'connector bank terminal sets to be 'attached thereto to be identified with respect to the subscribers' stations to' which each jumper refers. However, the'latter referred to convenience is a detailed feature. It will now be clear that when jumpers 29 and 430 are run totlie fitthand seventh setsoff terminals ofthe level group E, the'line 2 may be reached by setting the wipers 211 to 214 0:5 connector A"-upon eitherthe fifth or the seventh set ot banlecontacts ofthe bank level group D, or the line "2' may be reachedirom the corresponding positioned bank Contact sets inlevel groups B and C, as well as from other multipled' level groups tlier eoit',v not shown, Also, it'will' be clear that "theplacing ofth'e tie onea'ch' tlie'fi'fth and seventh set ofinterchanging terminals shown 1' in' Fig 8 will determine what specific sourceo'f signah ing current will'be impressed by the connector when seizing the line '2'from either" of its said two branches in The drawings" show theo first aiid' secondf' terminals of the fifth set" of the signaling current terminals tied 'by tie 355, and the". fifth and sixthiset of'the seventh set tied by tie 556." Thus,whenaconne'ctor seizes the I p from source f will be impressed uponthe 'line fifth set of bank terminals, l6 -cycle' current 2(and when a'connector seizes the seventh set" of bank termina'ls 50-cy'cle current troin source h will be impressedupon the line From; what has been #described, it 'is] clear that changing either or both the ties 355 and 85.6, will enable the source-"to beiiiip'ressed to the line 2iover the jumper; branches 4 29 and 30 to be changedat'wilhhavingin mind that theb'ellsor signal devices on the line 2' will be changed to be responsive to the applied source. Further, the jumpers l29 and 430"" may beindependently' changed from one set of bank terminals of the connector bank group to another, orto any other'bank group (not shown) ofthe central office. The'latter would be done if a change or re g rouping of subscribers were desired; the umpers being run to the connecto'rfbank numbers cor-responding to the telephone numbers-of the subscribers connected onthe line. Of course, w

the bells 421 and 422will be differently se',- lectively responsive V to avoid confusion, but

there is no definite signalingcurrent' charmaybe changed asand when desired, by al subscriber havingtelephone number 1118"? for the one having-telephone number 1115', the latter subscriber discontinuinghis service,

or perhaps being groupedwith subscribers onsome other lin'e. The jumper 429 will be transferred to the corresponding terminals'ot the'eighth set ofthe level group E and the.

bell l21 displacedby albell responsive to any available source othertha'ii 50-cycle employed to operate bell 4 22. Assume this chosen bell'is responsive to 66 cycle current, perhapsbecause the subscribers bell formerly-responded to-thissignaliiig current frequency, and therefore employing the same bell will obviate changing his telephonem'In this event a tie 358 will bemadebetweeii. the fifth and sixth interchanging terminals ofthe eighthset,

connecting conductor 326 "to the armature of relay i whereirfthelattersaid relay is-operated by interrupter I.in the manner made clear in foregolng descrlptlons.

The subscribers .telephone421 disconnected fro-m the line 2, the telephone number of which is 1115, may now be attached to any suitable outside line having subscriber V3,: cancy. A jumperwill be run from the fifth set of terminals of level group E (being connector bank number F1115-belonging. perbranch-block corresponding to 401 or 402, for

example, associated with the line to which the I telephone 421 is transferred. y In this" connec tion it will benoted that if the line to which ther than the said running'of the frame j umper- (retaining tie 355,) will be necessary after line. But if thenew'line already has a signal device (and code) which is like that of the:

changed telephone 421, any signal current (or code) different fromfthose used will. be chosen, and the tie 3555 changed accordingly; which completes the re-grouping, having in mind that the signal device of the telephone will have to be changedto correspond to the 355 is not retained as shownin the drawing. It will be understood that in case the; telephone 421iis' to be on an'individual line, the

a new jumper run from the fifth set of termi- V v nals ofthe group -Ewill be run tora vacant set of terminalsas 468,-forexample, and a sec-- .ond' jumper will be run from terminals 467 to a set of outside line terminals of the group containing the terminals of lines 1 to 4, but

not shown, upon which the'said individual line terminates. Under the latter assumed conditionincoming calls will be extended 7 throughthe lineswitch 465', while outgoing calls will be extended over the jumper at tached to'the said fifth set of terminals of the group E,'as when the telephone 421 was on the The bells 421 and 422 on line 2 are operated by16-cycle and -cycle current, respectively; If it is assumed'that a subscriber having telephone number 1'118 be connected toasaid in Fig.2 will not exist and aItie will be placed between the lower two terminals of theeighth group in Fig. 3. 'Thiswillconnect conductor 315 toconductor 326 so that when the eighth thereof) theline 2 will be signaledjupon from the source; 71: whereby a code offfiv'e fbells; willoccur to then'ewly added; telephone (not:

manently to the concernedsubscriber) to the the latter saidtelephone 421' is transferred has no signalcurrent-(16}cycle) associated therewith to cause confusion, nofchange :furv changing the telephone from line 2eto the-new;

impressed signalingcurrent, in case the ties'et of'bankcontacts are seized by wiper set 211to 214 (or any other'set'of'wipers havingaccess 'to a multipled bankficontact set shown) and also to the bellv 422. The sub-;

scriber having bell 422awill ignore the five bells while the newly added subscriber will respond wherein the concerned connector will function as has been set forth upon a response occurring. Regardless ofthe position of brush a 317 when the connector seizesthe line 2 the signaling current fromthe seizingconnector will not be initiateduntilbrush 317 has encoun-' tered contacts 341 and 344 andhasireceded to :the first successive contact in the manner as has been set forth in descriptionsowith rela tion to connector A. When the line is seized by a connectoroverthev branch including the jumper 430 wherein thesource it will be a a r P '80; plied to the connector through the tie 356the bell 422 andthe bell of said newly added telev phone willoperate, but as codes of one hell will be now applied by the seizing connector v the newly connected subscriber will ignore the signal. It will be-jmanifest in view of the descriptions, that in lieu of tieing the lowergtwo terminals ofthe eighth set in'Fig. 3, the seventh and eighth terminals thereof may be tied so in that event a short-long-shortcode of'33 cycles will be applied from source 7' by. the connector seizing bank 1118, i In this case, no hell on line 2 would respond, unless the bell of thenewly added telephone were maderesponsive 'to 33 cycle current, which, of course, would have to be done to establish thesaid new subscriber in service.

of the subscribers on the line'2 upon; initiating a callwill causethe associated lineswitch 435 to functionand extend the call to a first selector as inthe case ofthe call initiated r from telephone T, The private normalcon ductorwill then applygroundtothe private normal conductor ofithe jumper 427, and over the private normal conductors ofthejumpers (as 429 and430) branching fromthe branchblock terminal setf401 to the connector-banks correspondmgto the associated telephone.

numbers toguard theline against intrusion by aconnectorover anyof 1ts central ofiice branches. As the private normal conductors V of'the central ofiice branches of the line 2 are mutually otied,'when any said'branch is seized by a connector, all thelbranches are simul- 'taneously guarded against intrusion by a connector, as well as operatingthe lineswitch cut-ofl relay. e I The branch-block 444, whichlead from the first, third, sixth and tenth set ofterminals of connector bank group B, respectively, so the line3 may be reached. e over the said branches and jumpers 445 and 446 by calling telephone'numbers 1111, 1113, 1116 and 1110, respectively. The

line 3-has telephonebells 451 to 454 thereon selectively responsive to 16p-cycle, 50-cycle, 33-

cycle and 66-cycle signaling current, respec- 402 serves to junction the l corresponding conductors of jumpers 441 to r tively. Due to. ties 361 to 364 corresponding 1 V t the j mpers 441't squr 'f h.

and i will be applied selectively eflective to the bells 451 to lhWll6I1 any of telephone called, respectively.

The disposition ofthelineswitch 461 Withrespect to line 3 and accessible first selectors it and theccnnector bank branches reached over pinipers L11 and t ll corresponds to the re:

lationship of lineswitch- 4:35, line'2 and its 0 connect-orbank branches reached over Jumpv .ers 4-29-and $30. It will be clear thatthe responsive characteristics of the bells on line 3 maybe changed Without service confusion by correspondingly altering the ties'oni the con-- 15 cerne'd interchanging set corresponding to the concerned teiephcne number funthermone,

changing terminals corresponding to those in Fig; 3) will be tied to adapt the connector seizing any said line branch to apply s1gnaling current to selectively operate encode the corresponding telephone bell: on the outside,

g line; It Will-be clear, fore-Xaniple, that changing the tie 361-to tie the ninth and tenthter-v contacts of the level :(responsi-veto calling telephone number 1111 to projecta code of five fbel'ls?" of '50-cycle current. over the.

V jumper efiectivei-o bell 453 fin l u of one ell of 16-cycles i totchan-ge-the connection oi the telephone 40 from the one to the other saldline and trans 402 1 cv corresponding lugs on, the branch ,ter:

minal set eQl. 1Anew telephoneg thevbell of which isnet responsive to any; of the" em plcyedcyclcs one-line 3 maybe connected thereon to i:ei )lacetl1e l-i; e vacancy madefby the transferring of the telephone represented i by bell 452, and a jnmperlike' l l3run from selectiuely signal the other; subscribers or a subscriber ion :the line3,ebu t in eache ent a new code fronrthatthenemployed on line 3 Willaiecessarily be chosen for then wly added telephonevtoforestall-confusion. --,Tvvo; of the signalingcurrent interchanging terminals of r the connector bank number; of" the saidnew: telephone will be tied to adapt i any; connector seizingthe linefi through the; latterv said cone nector bank number to project signaling cur rent from. the proper sourceto selectively sig 7 nalthesubscribercorresponding' a adaptedto project current from source 7c if in view o'ti'oregoing descriptions, 'itvvill be manifest that if itzxis desired-to. change the telephone represented by ,Ebel li A52 from 1 the. line 3 to the line 2, all that. will ibeyrequired 1S terj u mper 443; from the branch-terminal set vention. In commercial The lineswitch 465 is dead, being cabled to 'arrester 4:67, the cable sets to the lineswitch 4:65 and to the arresterr 467 having the talking conductors tiedmultiply at the terminal set 468; i

The line lhastelephone bells 471 and 47-2- responsive to 33 and 50 cycles; respectively, The line a is: connected-over jumper 470 to an arrester and corresponding linesvvitch 471 on i the M. D.F.; Jumper'branch'es $73 and 474 from the lineswitch terminals on the M; D. F.

lead to the fourth and ninth terminal sets of level groupv Es vThese jumper- s 473 and 474 therefore correspond to telephone numbers 1114. and 1119?, respectively. Due-to the :placing of the mean and 372, the seizingconnector will be adapted to project current from source j if the branch including jumper 47 3 is seized whereby the bell 47 1 will be operated," and the seizing connector Willbe the branchlinclu'ding jumper 474 is seized whereby bell 472ivill be operated. In the case of applying source j, a code consisting of a short-long-short series oi bells? will ensue; each code always being initiatedat its.

plained, Ina comprehensive,. commercial beginning in'the manner as has beenveX- urinals inlieuof the firstVand'r-second, W111 adapt a connector seizing the hrst set ofbanlr systeinthere would ordinarily be agreater number of code "combinations-than shoavn,.but the, method of applyingthern alternatively to any line Willbe ashas beenset" forth. In'i-nstances, all of the-sources mayybe code, con-v sisting of a pluralityiof ibells ion a signal. It will be manifest that theme-372 may be changed from the. eighth and ninth terminals to any other acent ones by correspondingly changing therbe'll 472 to be responsivev to I the changed signal-current source asses ciated with thebranch including jumper 4574.

However, it the said tie is changed to the third and fourth, terminals, 50-cyc-le currentwill be then adapted to be p rojected from source 71 through-a connectonseizi-ng -.tl1e branch'includingfjumper 4 74, so the bell 472 will be operative to the periodic nonecode applications. r v V "The jumpers 4T 3 and 47% run directly to the terininals of linesivitch .471, in lieu; of through branch terminal set of the type of 401,! for, example; thus obviating the employment of ajuinpercorresponding to 427, for example,

though it Willjbe' clear, such an intermediate bra-nch terminal set may be employed if dc-L s1 red,.s1nce.the1 system admits of variation. withoutdeparting from the scope otthe inoperation, certain. divisionsof the arrester terminals on-the M. D. F. mayv be set as de Ifor'l'inesof-the different ,classi-fie.

cations. Thiswwillmeanthatxthe lineswitch terminals 'OIlQlllB; 1. 1); will: be correspond: ingly segregated. 1 Itwillthus. be iound con:

venienttandinfacfiit iscontemplatediin, the 1 present invention) to-iuse gang-terminals for tliereserved 011 diiferent plurality classes of party lines, so that the jumpersffrom the connector. bank terminals .may junction at the I. D. F. lineswitch terminal. set concerned. This, for example, will obviate the jumper as 445 and the branch terminal set 402, since thejumpersll to 444 wouldallrun directly to the gang-terminals of. the lineswitch 4:61. Theijiumpers 47 3 and i 474 arerun in the'manner last set forth.

There would not-necessarily beany segregation as'to classes inthe connector blanks. On the other hand, the diversifyingof the classifications in the connector 'banks promotes making the coincident trailic uniform in the various groups at all times of the day, as the traffic. characteristicslof, the diverse classifications constituting the :groups will-intermesh.

- The more uniformly the groups are diversifield as to classificationaof jthe. subscribers reached therethrough, the: more uniform "will be the 1 coincident trafiic' in the connectorv groups of the central otlice, thus requiring the minimu'm of connectors for a stated trafiic for the central oiiice. The present inifzentlon lends itself as one of 1ts ob]ects, to promote the Said.

diversifying of the traffic amongthe connectors of the central office. a

- The illustrative crossrconnectionshave concerned a single level of a connector bank group, but it will be understood that this method has beenused as it appeared the sim plest manner of disclosing the comprehensive system contemplated, and itso'peration. The

system contemplates that eachlevel of a plurality of multi-level (or single level) bank groups will be arranged asshown in Figs 2 and3 wherein all'the bank groups terminate on the LD. F. for cross-connectionwith the conductors of any level o r;-levels of the said pluralityand with: the desired subscribers line, wherein interchangeable central oiiicev branches from a subscribers line may terminate into widely separated goonnector bank groups not having des gned permanent relation..

It :will appear, infview of the descriptions,.that I have. provided, amongother functions, a system of assembling cen tral' olfice equipment elements of well known type and also of equipmentielements of the present inventiom'with outside subscribers lines wherein changes of groupings of party subscribers may be made without changing calling numbers of the concerned subscribers, regardless of the type and kind of signaling current it is found convenient to employ from time to'time for the bells, with due regard to selective calling. The invention also provides for keeping party lines-filled to operating capacity, because in the event of disconnecting a telephone, anew telephone havingany desired telephone number, may replace it.

' Moreoveig the said added telephone'may be responsive to anyavailable signaling characteristic, and then changed fromtime to time without changing the calling number.

The system of the presentinvention thus lends itself to re-grouping subscriber lines from time to time toconform to the most economical treatment of the outside plant as regardsparty line grouping. It also con duces to the employment'of the lineswitches j to their fullest party capacity, because when a disconnection of'serviceis made with reference to any party line, the connector bank branch or number concerned, and notrany fraction of the lineswitchrapacity of the. central o ifice, is the only portion of the central ofiice equipment taken out of earning service until the disconnectedisubscribers num her is omitted from the subscriber directory, Thisalso applies when an individual subs scriber changes to a partyrline classification I or whenhediscontinues'his service. In the case of disconnecting theservice, the cone nector bank number is thefonlyelementof the central' .oflice equipment retained out of;

revenueservice, and the latter is only so retained until the T disconnected subscribers number is omitted from the subscriber direc- .tory'. The said connector bank number. or. branch represents arelatively" small capital investment as compared to the lineswitch ca pacity which would be lost were not some method, suchas is provided in the present system, provided to reinstate the lineswitch idleness forthwith after such idleness occurs;

of a plurality of accessible called subscriber V lines or branches of such consequent upon seizing the called line or branch-without the" n necessity of the calling subscriber performing a specific signaling current selecting operation; seizing-the called line o'r branch of thecalled line determines the character of the code of'signaling current to be applied direct- .ly from theconnector wherein but one characterof signaling current is then present in the connector. And, moreover, that the said I one character'of current present inthe connector cannot be applied from the connector excepting at'apre-determined time ofthe op erativeness :of'the current *or code; That is,

the character and codeof-thesignaling cun rent received and impressed by theconnector is determined by'and merely incidental to the selective setting oftheconnector with respect to connecting with the terminalsof'theicalled 11119;". i i. .1 u I Q .V Again, the system operates .to obviate numscribers, and where changing the type of sig-" 'ber changingwhen; re-groupingparty subs 7 may become large itemtro f expense to -the e t ng" curren 10.1 the-ce e l ere f i 1Si i9l for anyre so hengleg nu e l -annqy;

ing to the subscribers and the records [o fueh operating concern inourrex ltly same and in giving thie information to its ubs b r wh al ing e a ge members The latter is aside from the idle traific yee ing su s ib ns t i bfiain an d- 1 h i me iqna d the nnoyenqe esioned to the gelling 1 110slcr ibere in obtaining e chang nf rma i n I claim:

;;1. In a telephone system, in vcormegfpor witch; line bankxmntaets' for .thegcoml'e tor,

sigrraling contacts Ifor the connector correspondingrto vthe l ne contacts, ap l 1,1-

al ty' Of -ru i difie oen sign l e em:

rents, line and signaling Wipers for thereonnn t ng said s r s 01 n in curren and the bank s1gna-1 1 1 1g contacts, aronpec tion extending from .the signa l i ngWiper to, a llne Wiper for conductingrslgnelmg current. to

from the se e d"b ks gn "ce eet l szud hne wlper, telephonellnes and a second conpecting {rack ifor;interehairgegthly connecting said lines and line eontaets.

:Q-"In a telephone. ys e e .mnewr swlteh, line ban}; coz ltgrcts gi'or the corrlglector,

sig igal ing cozgtacfis for the qom ieotor balgrkeorresponcllogito theiline contaets, a of soureespf rd l fierent ergnwhng .cu-rrel tts,

line and signaling wipers magne cohnejetox,

a, connecting rack vfor interchangeably connectnrg sold sources of-sLgpal-mg current and, the bank slgnahng .contzgc-ts, ,1 eon-neotlop Xf tending from the signaling viper to it line \ylper for conductrng rslglrgtlrrrg current from the selectec t bapk signaling conta-et to said Line Wiper signaling correrrt i rlterrupter means lncluded 1n the s gnahngteurrept path telephelie lines, and a second connectingsmek. 1

for intergh angeablyreorrneeting said litres and hne contacts. v

3. In a telephogee system, Q 00vnr1eetor switch; line bank coritactefor the cmmeetqi,

sgrre1ing contacts for the connector bgrik com'espondin g to the line cont acts, .2 plurality of sources of difierent signalingiegrreagts me and sign aling wipers for $118 icomiec t connecting rick for, interchangeably connect-1 ting said Sourcesifof Signaling ourrentiand the bank signuli lig contacts; 21 conrlectiorg extend "izig" from the signaling" wiper to it linewiper 7 emichicting signaling eurrerit from s ee-ted. bank signaling. .c 011t aet to {said 'ne wiper isigrialijrg current ifit errrIpterfiritr posed between the sources of rsigngl inglourrent and the first saideopeecti ng rac k,vtelfe.- phone lines, and aseeond eonnectinjg rack for iritercharigeably connecting said lines 3nd line contacts. V

4:. In a telephone system, eonnector w he having m i tipl 'Q nee ibeek l h in gira pa ylinto i ig' ldeyices (fie-B1 edlthere e, ee

coiniijec fed hank l ne-teon tae ank I ie he -i 12 Ply-relive? e9 eri e t l e eee {lines hevillg' eelepme is gn ing fieviees -gbfnneeted. the eto, ga

c gn egjfi ip r'aek jfar interchailgeably ,iconne fi. ou l y hides 6, bank Q lEKitsQ-if$ e0 1ii tors lt 'hes; $9 lr'ce Qfl re pending-i ih il ne pal ibankmslgrl glqwitaslefl t h connector switchesorrespontliii "to the'jba-I tk inete9ntactsranphmeensi n-i jl opt l ct pg the -,gs:ou li ge "-.of sign ng @m'ren? 1n,- t it en e l m-ml t ng a pa ty t m 2 e r -y i z lel ecto rcqhte ts f'the-samed it t "g -t p -.5QL11CS of signalingrburfi n -tol h s le t y i -n aling h i' c s 011.1" the rcon' iec o switches co'rrepondirig to the line Qontaets,

e m e iet he eee ly o t n th e- SQUEQQS ,qfj sigr ralin currerit to ,the gs i gt group sf f t n- I watc e eeeh te 3 7 fa it plurality of mi y-t phol lines, plurality of tcQrmec- .7 -beek ign ng e i t i 'e e ee \Wlththe seleotlyesrgnal e -ewi r i s-hz ving b nk i ie-s i ta ts, means,

forjrnterelrarigeaihlypolgneetings aidlil es and, a p umber of eon t agt s .Q "the connector p o flp l il flmd,iildep ldfil t o anypred t m n d inumeriq r l ol O the @Q e ts, s ur es E i" signaling c'urrent e 1 "(indigg to Ltheteleloihones bn thepanty line's, ign l ng cu ren ,b ik-lqonta s "cprrespon ing-to the; me-e m'ct s, arid means. for intertorswit hest aehg eup hev mgmultiplysonnested bit-I ll;

eeideviee r ne t r h e e e mlec ie i awe switches eorrespoildi, flto ltliejlilllriber ,oftelef signals on any line.

difiei tfgrtups', soureesjof signaling current V corresponding'tothe selective signals, signal-' ingfcurrent bank-contacts equal in number to the'line contacts and corresponding thereto,

' and f means for interchangeably connecting the sources of signaling current to the signaling contacts to correspond w th the selective 9.- 1 a telephone system,groups of connector switches each group having multiply con nected bank line-contacts, party telephone lines having interchangeable selective signaling devices connected thereto, signaling current bank contacts equal in number to the line contacts and corresponding thereto, 1 means for interchangeably connecting aparty line to a plurality of connector "contacts of the same orditferentgroups, sourcesotfsignaling current correspondingto the selective signals, and means for interchangeably connecting the sources otsignaling current to the signal ing contacts to correspond with tlie selective signalsio'n anyline.

'10. Infaj telephone system, [a connector switch having sets of bank contacts each in a cludingfa line contact and a cerresponding signaling contact, line "and signaling wipersfor tl ej connector, a pluralityot sources of difl'erent signaling currents, a connect ng rack I for interchangeably" connecting said sources er signaling currents. an d the bank signaling contacts, telephone; lines each having one or more telephones'and interchange able; signal"-devicescorresponding to the'differe'nt -,signalingpcurrents, a second connect ingracl: for interchangeablyconnecting said lines and one orjrnore sets of the line contacts I indiscriminately, whereby 'said telephones may be changed from one line' to any other withoutchanging their calling numbers.-

j 1 1. In 'a telephonesystem, groups of connector switches each group having multiply, connected bank, line contacts, party telephone lines havinginterchangeable selective signal iho l i ma seized in attaining connection with the linefor adapting a predetermined one of said sources of signaling currentrto'be projectedover the line, and meansfor interchangeably connecting the sources ofsignaling currentto correspond i vith the bank line contacts and" the corresponding select ve "signals on any line. t

12. In a telephone systeni, 1 a plurality of party'telephone lines, a plurality-of connector. switches having bank line contacts,n1eans for interchangeably connecting 7 said "lines and a number of contacts ontheconnector switches corresponding to the nuinber oftelephones on aline and independent of any' predetermined numerical relation of the contacts, sources of signaling current corresponding to the teleit phones on the party-lines, means controlled" depending upon theibank line contact seized in attaining connection with; the line for adapting a predetermined one of said sources of signaling current to be projectedover the line, and means for interchangeably connect f ing the sources of signaling current to corre-.* spond with thefbank' line contacts and the cor- 1 responding selective signals on any line. a

13, Ina telephone system-a line, a connec tor switcln linebank terminals for theconnector, branches of the line extending to a pluralityof the said terminals, a plurality-of sources of'signaling current,"1neans for iinpressing a said source of signaling current upon the-linefor operating a selective signal device thereon "dependent upon 'What line'- branch" bankIterminalis seized by" the connector, a connecting rack "for interchangeably connecting sa d sources of signaling current,

and means i for interchangeably connecting the said branches to correspond with the related signaling current sources and the said signal devices on thelinej I 14. In a'telephone system, a connector switch, line bankcontacts Itor'the connector,

signaling contacts for the connector bank cor responding to the line contacts, a plurality of sources of different signaling currents, line and signaling'Wipersffor theConnector, a connectingrack for interchangeably connect ing said sources of signaling current and thebank signal ng contacts, a connection extend ing from the signaling wiperto'a line-Wiper for conducting signaling current from the 'selected bank signaling contact to said line:

ice I wiper, interrupter ineans included in the sig naling current path forcontrolling theappl cat-ion of signal ng current in successive trains of series, and means controlled by the said interrupter whereby the application of any portion of'a'train ofseries-Will be'disabled from being initially applied after the interrupter has started the fapplicationfof a 1 5JIn' a telephone system ya; connector W switch, line bank contacts for the connector,

si naling contacts for thefconnector bank corresponding to the line contacts, a plurality ot'sourcesot difi'erent signaling currents,'line' andsignaling Wipers for the connector, a connecting rack 'for interchangeably connecti i -12 bank signaling contacts, a connection extend- 1 ing said sources of signaling current andthe ing from the signaling Wiper to thelin'e Wiper.

for conducting signaling current from the selected'bank signaling contact to said line iper, interrupter neans included in the signaling current path for controlling the application of signaling current in 'successive.

trains of series, means controlled by-the said interrupter whereby thegapplication of any portion of asaid tr'ainiot series will-be dis l l accessible from the connector, a source of mg- I a Specific sairl'character will be applied to'the called line depending upon which branchv of the calledline is connectedgwith.

: connector, a signaling current source for ap- 'plication to thecalled line from the connector,

a relay opcrated forclosingacircuit path between the signaling'curre'gnt source andthe connector, and aconduc-tojr individualto thecalledfl'llne ncluded 1n said CllCUltpath between the source and the connector/over which said relay isf' op'erativelyenergized.

24.'In an automatic" telephone system, a directively controlled'connector, a called line naling V current ihaving intermittently live pe-.

I, riods ,for application to the, called line from the connectonan'elay operated for closing ato the called line for applicationto thecalled circuit path betwc en the signaling current source and thenconnector included in said circuit path between the source and the corn nector over which said relay is operatively energized, andmeans the operation of which is non-directively initiated after the connector has been operated intoconnection with the called line for causing the-operation of therelay only at a predetermined time with respect to the live periods of the signaling current source; a v

25, In an automatic connector, a called l ne accessible from p the connector, a signaling; current source specific line from the connector, arelay operated fer thercalled ;line-included,in said circuit path r betweenthe sourceiandgthe connector over which said relay is cperatively energized.

26. In an automatic telephone system, a

connector, a plurality of called lines accessible from the connector, signahng current sources spccific tothe respectivecalled lines for application to the line called from theconnector,

a relay operated for closing a circuit 'path between the signaling current source and the "connector including a wiper of the connector .and'a terminal of the selected called line,

and aconduc-tor individual to the called line included in said circuit path between the;

"said r V p 4 I 31'.;In anautomatic telephone system. a

connector, a plurality of called lines accessible .from theconnector, a source of signaling cursource and the connector over which relay is operativelyenergized; s V

1 called lines accessible';:from 1 the connector, sourcesof signahngcurrent spec1fic;;tothe respective calle dl lines having intermittent live periods for application to the linecalledf 1 fromithe connector, a relayoperated for closk ing a circuit path between the signaling current source'and the connector including a wiper oftlie connector and a non-talking terin sai'clccircuit path between thesourccand .the. connector over which said relayis open 23. In"a .n, automatic telephonesystem, a; v connector, a called hne, accessible tromfthe atively energized, and means the operation'of which 1s non-d1rect1vely lnitiatedafterthe connector hasbeen operated into connection with the line called for'causing the operation 5 28QInr an automatic telephone, system, a

connector, a' plurality of called lines accessible trom the, connector, a source ofsignahng current and'terminal therefor specific to each circuit path from the. signalingcurrent ter-' minal ofthe connected line to its companion f 11116, and means controlled over the signaling current terminalof the connectedline to operate therelay.'-

connector, a plurality of called lines accessible from the connector, a source of signaling current having intermittent live periods and terminal thereforspecific to 'eachsaid line, a wiper of ;the' connector cooperative 1 withthe respective'said terminals when, a line telephone systenn; a

7 necton'a relay operative to complete-a circuit 29. In an aautomatic telcphone systcm,a i

of the relay only at a predetermined timewith I respect to a live period otqthe signaling cur-r rent source of theline called.

path fromithesignalingcurrent terminal of the connected line to its companion line, and

V 7 means controlledgoverthe signaling current closing a'circult path between the signaling j current source and the connector-including terminal lofthe connectedjline to obera'te'the relay only at a predetermined time withi7espect to'a live I period; of the corresponding signaling current source 1;

connector, a plurality-cf;called lines accessible from the connector',f a sourceof signal ing current andterminal" therefor specific to each said line,a'- wiper of the-connector cooperatlve w th the jrespectl ve' said terminals ..ll when a l-inecompanion thereto is connected '30. In :an automatic telephone systein, a

to by the co1inecto1',ja1'elay operative to com- I plete a circuit path fromlthe signaling current termmal ot the connected line to its'com J panion line, andnon directlve means apphed over the Vsignal-in'g currentterminal-of the connected line for causing" the operation of the relay responsive to effecting connect-ion totheline called.

wiperiof; the connector cooperative with the respective said terminals when a llne comthe-connected line to its," companion line, and

{rent having intermittent live. periods and A v vterminaltherefor specific toeach said line, a

1 specific to eachline for controllingthe appli 1 cation of signaling current toits companion f .line in aspecific manner, a Wiper of the; con-if "necton cooperative with the respectiye saidi f specificter-minals when alran donisaid line? nee-tor, relay mechanism operative to prepare I a signaling.currentpathtotheconnectedline, plurality of lines Jzicessible from the con- V l mmalof the ,GOIlXIGCtGClg 11110130. operate the connecton ar plurality of lines accessible fizomi i sponsiye signal devices-on the line each sper crficx to .asaid, branch, signaling current sources; haying characters specific t0. the renon-directivemeans. applied oyer tlie sfigria l-Ii mg current termmal of the connected ,line', for causing, the operation ofthev relay re- 'sponsiye-toeffectingconne'ction Withthe-linez sp ective, hranches,]a-1%elay, a Wiper of't'he 1 called but only at a.predeterminedtimewith aconnector, an auxiliary, terminal" of th respect to a, live pence ofv the. corresponding, signaling.currentsource;

e re-- spectire hrancllcsbooperative with thejxyipfer \vhenaj random said branch-is selectedhyt'he connector, means Wh'e'f'eloythe opera oji fof the 'r el'a'yewillfbe' rolled o'verf the Wiper responsive to afsaid hranc'h'heing selected, and

.32; In an automatic telephone. system,

theconnector, a sourceof signaling Cu ran; a busy-test termmalior each line,-a terminal means for causingftherelay'by itstsai'd operation ,to'a pply signaling currentfoyer tliesaid aur ilia fy terminal of the selected line tothe sel'efcfiedline fromfthe source haying the character s p ecifi'cj' to the 'loranchj selected to cperate 1 only'jthe corresponding signal device :on the companion thereto is connected-to byl the con line";

ear it; telephone system, connector, a

and means-controlledover'saidspecificflten' jiggt diffr fly-g l fi ely gi na'l lev' e on the'respective l1ne'3's,av source rent over saidispecific terminal tojatalking conductor of thecalledilmevfl M current over the said auxiliary terminal of the" toie'ajc'li s ice, r'el'ayme'chanism, arWifien a 1, .L1 of" tlidconnetdr, an" auxiliary tern'fin'a-l of 111 all tfi p o e r b s i! the respective lines 'cooperative with the connection l y o e a eq s b iji wipi-wlienas at line isiconn'ected' to b the t sp i os Q 'i g it ng. current "ns wherehvfthe operation 'of e h reiperio e la ie'frel ay niece Harem win"-bemmanneever mmal therefor i each .Sald tlief Wiperresponsiyetd aiand om aid line controlling the appl cation of signaling cur-f b ffm fi .5 m a s 'f rent to it Companionline in e fie m?"mechanism-Thy is see amnofi a l' of the connector r iieignalinacuri-nr from isurbeil 1 wlth the respectivesaid terminals when a ran f" h fi pdfigl t6 h H Q'IE-f T id dom said line companion thereto is connected iif wh i-in said Wipen fofm T pfiflfdf by Connector? relay l e signalingcurrent,and-means no direct iyell five to Prepare a slgnal 1 path to applied 'afor causinnthe si' 'na-lih current to connected line, and means controlled oveikb a t6 Hi ii aifi a 31.9 the said specific terminal of the connected k l gm dline to operate the-relay mechanism only a v ribdgvltflerof; ,1 a predetermined time with correspondence ,5 fw to the requirement of said specific manner H,; f W fl9 to apply said signaling current over said spe 1, 1 fi wf 'e e cific terminal to a talking conductor of the wnnectml' me stgnalcevlces Z 'FW P g Called ling torthe brancheg isources -01? .d1fl;erently ,pe-. 34. In a telephone system, a connector, l i' plurality of lines accessible fromthe connec' 1 -79 l s u P-1 .1 tor, a diilerently selectivelyresponsive signaT SR Fm' d 'b f h if r w 19l fl1 h device on the respective said lines, a signaling*- P- h fi 991 m x -l i fil current source specific to each said device, 'Ojithe l Q-S f lm gfi fi f m relay, a Wiper of the CODIlQCtOI,i1I1 auxiliary w l w p ea j fipm h' fiP 9 terminal of the respective said lines cooper r hs to cm e r t tive with the wiper when a line is connected iQP QH- h?" 1 y Q Q H'B l bQ I to by the connector, means whereby the op lljll'e d 0Y6? h W l 6i} 3 PQ W n p L a d branchflee ng:selectedymeans for-causing the wiper responsiveto arandom said line being selected, and means for causing the re lay by its sa1d operation to apply signaling selected line to the selected line from the? source, having the character specific to the selected line. i I 35. In a telephone system a connector, a branched line, each said branch accessible from the connector over specific bank te minals therefor, differently selectivel re j 38. In a telephone system, a connector, a

' called line accessible from said connector over any one of a plurality of branches of l the line, a signal device on saidsline-correpen ing to each saidbranch, a code current sending devicecorresponding to each said bla nchv for' supplying signaling current inav train of successive live and dead periods for l. lng application of slgnal ng current to' the regardless of when the branch of the line is of any said code sendingfdevice other than ain'g code current sending deviceand' cause the corresponding slgnahng' ode to applied to the a correspondingtslgnal devlce to branch "selected.

application to the called line :overj-tliebranclif selected by the connector, means for preventcalledline except atthe ,beginnin gof a'code, meanswhereby theistarting of the applica tion of a code totlie [called linewillbe dependent of the time of effective Operat on the one corresponding to the branch selected f selected, and means whereby the branch of the line selected will determine the correspondoperatelit with specific correspondence to the .39.;fIn a telephone system,a connector; a

called line accessible from the connectorover any oneof a plurality of branches of'the line,

rents in successive "'live anddead means whereby vthea'c urrent will be applied 'toa called line'b'ranch from the connector only atthe inception of a liveYperiod-, 'means 'branchcalled, 1

Wit HBS S WhGIQOfl- I hereunto subscribe called line incorres'pondence ivith the line called responsive to the selection of the called.

41; In a telephone system, a connector, a plurality of called line branches accessible fromsaid connector, a current supply branch 70 specific to eachsaid line branch, means for operating said connector to select a desired one of said'line branches, means specific to each said line branches for applyi'n said curperi0ds,775

whereby regardless of the time the connector ';selects a line branch the'applicatioln of the; 1 i

current thereto from its corresponding sup-.

'ply' branch Will be irrespective 0ftl1e o'perative; position then assumed bysaid means for applying current over any of said supply branches other than the one of said means? l corresponding to the branch selected bythe connector, andmeans whereby the specific saidf supply branch will be applied to the called line in correspondence With line my almethis sixteenth day of J une, 1923 :PHE BEB M-FB E DL n ing,of;:a live' period, meansi vher'eby the 7 Q applicationpf current to 'thefcalled line will i "be independent oftime of efiective operation.

of any said sending device other than the one corresponding to thejbranch' selected ire- V "gardles's of when the branch otthe line is'sebe" applied correspondingsignaling device.

' 'l( ).*In"a telephone system, acon nectorfal plurality 'ofcalledlines accessible fromsaid lectj'ed, means whereby the? branch of the line 1 -select e'd will determine the signal device to beepr tf a by thesignaling current byfalso.

"thereby selecting the corresponding current V source andfor causing the selectedgso urce to op'erat'ively effective to only the "connector,.a source ofcurrerit specific to each;

. said'line, means foroperatin'g' said connector,

tofselect a desiredone ofsaid'linesfineans-g' f r for "applying said sources of current in sue I f v =cess1vel1ve' and dead per1odsgineans'whereby' r V the currentwill be applied gto a "called "line u from the connector only at, the inception; of

is, live period,- Ineans/wheireby regardless,of J '60; i

the ,timethe connector selects a called line Y fl the application i of the current; thereto from j the specific source will bejirrespective of the time.;of efiecting live and ,deadperiods of l as othersaifdfsources, and means whereby, the Q H specific said source yrill hgappligd to; the

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