US1891254A - Automatic telephone system - Google Patents

Description

l Dec- 20, 1932. E. P. G. WRIGHT ET Al. 1,891,254

AUTOMATIC TELEPHONE SYSTEM CA FIG. 5

, PAH Hun@ r S rr/ I i zr/ /P AVA7 INVENTOR ESMOND P. G. WRIGHT LESLIE B. HAIGH Dec. 20, 1932.

E. P. G. WRIGHT ET AL AUTMATIC TELEPHONE SYSTEM 4 Sheets-Sheef 2 Filed 001;. 30. 1950 FIG. 4

T H H mmm A mem E l VME mNU 0S ME sl- E BY l Dea 20, 1932- E. P. G. WRIGHT ET AL 1,891,254

' AUTOMATIC TELEPHONE SYSTEM,

Filed Oct. 30, 1950 4 Sheets-Sheet 3 X X X INVENTOR ESMOND P. G.WRIGHT BY LESLIE B. HAIGH ce. w

ATTORNEY De@ 20, 1 932- E. P. G. WRIGHT ET AL 1,891,254

AUTOMATIC TELEPHONE SYSTEM Filed Oct. 30. 1950 4 Sheets-Sheet 4 wmawfwmws Y INVEINTOR 3 B ESMOND P. G RIGHT LESLIE B. HAIGH Patented Dec. 20, 1932 UNITED STATES essere A'rsr erica ESMOND PHILIP GOODWIN WRIGHT, OF ALD'WYCl-, LONDON, ENGLAND', AND LESLIE BAINES HAGH, OF PARS, FRANCE, ASSGNGBS TG NTER-NATEONAL STANDARD ELECTRC CORPOBATON, 0F NEW' YORK, lt.

Y., A CORFRATQN 0F DELAWARE AUTOMATIC TE'LEEHONE SYSTEM Application filed October 3G, 1930, Serial. No. 492.223.

This invention relates to automatic or semiautomatic telephone exchange systems and is more particularly concerned with systems in which order wires are used. Grder wires are normally used between operators at different manual exchanges for the transmission of particulars of calls to be set up between the two exchanges.

Proposals, however, have also been made whereby order wires are provided between automatic and manual exchanges. In these arrangements, an order wire to the wanted manual exchange is automatically7 taken into use during the setting up of a call from an automatic subscriber, and it is to such arrangements that the present invention relates.

According to one feature of the invention automatic to manual order wires comprise a single pair of conductors.

According to another feature of the invention, voice frequency currents are automatically sent over an order wire taken into use between an automatic and a manual exchange during the setting up to a call from the automatic exchange to the manual exchange.

According to a further feature ofthe invention, the order wire is adapted to transmit a busy signal from the operator at the manual exchange to the automatic exchange in response to an action on the part of the operator.

According to yet another feature of the invention a. selecting stage in an automatic exchange is adapted to select one of a number of groups of outlets in accordance with the path of access only.

ln the embodiment of the invention to be described, the automatic exchange is of thev common control by-path type, that is an exchange in which each selected stage comprises a conversational switch of the finder type and a lay-path switch over which the connection is primarily extended and which controls the setting of the conversational switch.

Fig. l of the accompanying drawings shows the layout of the embodiment to be described. in setting up a call to a manual exchange an automatic subsfrriber dials the wanted subscribers number. ln response to the code digits an outgoing selecting stage is reached and in Great Britain November 13, 1929.

and the outgoing bypath switch R2 selects an idle outgoing repeater .RP associated with which is an idle register RG. The remaining digits are dialled into the register and the outgoing conversational switch becomes connected to the repeater. An order wire or order wires is or are adapted to be connected to the register by a plurality of link circuits LC which are allotted for use in turn by link sequence distributor switch LD. This switch determines that the calls to be set up over the particular order wire or order wires are extended thereto in strict order of arrival. T.llhen the register has been set a predetermined link circuit LC makes connection therewith and when the wanted order wire becomes free connection is made between the order wire and the link circuit. A signal is now sent to the operator at the manual exchange who thro-ws her listening key. The register is associated with a common call announcing mechanism, and in response to the operators action, theregister controls the announcement of the wanted subscribel"s number over the order wire 'to the operators phones.

lf the operator linds that the wanted sub-r scriber is busy, she throws a busy key associated with the order wire. In response to this operation busy tone is sent to the calling subscriber from the register and the register and order wire are automatically released. lf, howeif'er, the call can be extended, the operator picks up a single ended cord individual to an idle one of a group of junctions from the automatic exchange and plugs into the wanted line. This operation marks the junction in the banks of a finder switch CF associated with the repeater. The register is arranged so that a predetermined interval after the announcement has been made, it will initiate the hunting movement of CF; this interval is determined by the average tine an operato-r will take to test and plug a wanted line.. l/Vhen the finder switch GF makes connection with the junction, the register and order wire are released.

The same set of repeaters and associated yistcrs can be reached from the outgoing ecting stage in response to a plurality of fits, ln the particular embodiment', two

paths of access are commoned, a relay JJ being operated if one of these paths is used. In this case the register and switch CF will have access respectively to a plurality of order Wires and groups of junctions to different exchanges or to different positions at the same exchange. In accordance with the path of access to the repeaters, an order Wire in the desired direction is selected and the finder switch CF is made to hunt in the required group of junctions only. If the exchange to be reached is a tandem exchange it may be necessary to announce the name of the wanted exchange, in addition to the Wanted subscribers number. The register is arranged so that in accordance With the path of access thereto an exchange designation or some other suitable announcement may or may not be sent from the call announcer, or different designations may be sent. The path of access may in addition control the selection of different positions at the tandem exchange.

If split order Wire working is in use at a manual exchange and order Wires are incoming to the same position from manual and automatic exchanges, it is desirable, in order to retain uniformity of announcement thatthe name of the calling exchange should be announced from the automatic exchange.

An announcementof the designation of the calling exchange can be made in the present modification.

Other features of the invention Will be apparent from the particular description of this embodiment given belou7 and are set out in the appended statement of claims.

Referring now to the accompanying drawings, Fig. 2A and 2B illustrate a repeater circuit which includes a non-numerical .sv-:itch which permits the repeater to be used in conjunction with any one of a number of junction circuits.

The junctions terminating on this switch extend to two diiierent exchanges or alternatively to two ditl'erent operators positions at the same exchange.

Figs. 3A and 3B sliouT a register circuit which is associated with a number of the re` pcater circuits shown in Figs. QA and 2B. The register is arranged to store four digits and is Wired in multiple With other registers to a common announcing mechanism which announces various designations independently of the operation of any particular register circuit.

Fig. 4 shows an order Wire link circuit which serves the purpose of connecting the register to the required order Wire. A link sequence distributor also shown in Fig. et controls the sequence in which any particular order Wire makes connection with registers Waiting to announce a call.

Fig. 5 shows an order Wire junction circuit modilied to receive calls from an automatic exchange.

Fig. 6 shows an order Wire junction circuit modiec to receive calls from an automatic exchange.

rllhe repeater and register circuits are testand seized simultaneously over the test Wire, cont-acts 7rd., 5111, ,trl of the repeater, contacts obo and ne home position and Wiper 'Win32 to battery. rllhe operation oi the testing relay in the preceding switching' stage causes the impulsing circuit to be extended to the register to cause the operation of relay le.. lt should be understood that the testing Circuit, which has been described, is used for any or the plurality ot junctions which may reached through the non-numerical stage associated with the repeater. lFlic-n these junctions are leading to two dil'erent excnan ges, it is necessary to maire some discriinination in order that a junction in the proper group is selected. For this reason the register is arranged with a discriminating circuit operated by the path of access by means of which certain relays are operated. lf, for example, the junctions lead to exchanges l and II it is assumed that the necessary discrimination is obtained .by the oflice code ts received by the preceding switching stage and that Whereas the relay A Will be operated only When the exchange l is required, the relay .lJ will be operated in scries with the relay A when exchange ll is required. The relay A closes the obvious circuit for relay B at al relay B closes the preceding lay-path. The circuit for relay .l is then maintained throng'` contacts 6F23. 7012, hr3, c5712, the impulsing loop (Erl, hr2, to ground. 7h-en the relay fresponds to the dialling impulses a stepping circuit u'ill he closed for the magnet RMS through contacts est, 62, Winding of relay C, al, to ground. Relay C is of the slow releasing type and remains operated during the train of impulses. The switch lllil Will adance its Wipers one step for each impulse received and when the relay C releases at the end of the train of impulses, a circuit will he. closed from the batterj.v` and non-inductive resistance onnectcd to the Wiper win32 through the bank contacts in any ot the positions 2-9, Winding ot relayZ,contacts e2, c1, M, to the Wipers, 7112133, M23-it, M7135, Win36 and through the relative bank contacts to cause the operation of the combination of relays BL MB. MC, D which correspond to the digits dialled. Relay Z is operated in series with the storage relays MA. Ml? etc., but is .slow to operate and consequently the storage relays will have closed their locking windings, through cou acts sel and Zil to ground before the contacts The circuit is also provided when e2 open.

the relay Z operates for the magnet ll through its iaterrupter springs. contacts the bank contacts and Wiper rin/37, to ground which causes the switch to step forward to position l0. The second train of impulses cause a similar operation, the corresponding combination of the relays CA. CD (not shown) being locked up to store the digit dialled and the switch RMS advances to position 20.

Should it happen that the thousands, and hundreds digits stored in the relays Miel-MD and CA-CD are identical, a cil'- cuit will be extended from battery, wipers 1m32, bank contact 20, contacts cd2, mai), m52, c62, ce2, m02, mdQ, cd2, cl, bei, wipers rm33, M7134, M7135, rm, which will cause the operation of any of the relays MA-MD which were at that time unoperated. The third set of impulses operates a combination of the relays Dfi-DD (not shown) and causes the switch RMB to advance to position 30 while the fourth set of impulses causes a similar operation to the relays UA-UD (not shown) and the switch RMB advances to position 40.

Should it happen that the third and fourth digits were identical, a circuit would be closed through contacts w12, (M2, db2, M52, a02, 62, (Z682, M032, to causethe operation of any of the relays DA-DD which would otherwise remain unoperated.

In position 40 a. circuit is also closed for the relay E and battery through the winding of relay E, contacts el, 6252, sa?, Wiper M7238, m2, to ground. Relay E locks over contacts 3l and bl to ground. Contact l2 closes a circuit for the magnet of the order wire link circuit LM from battery, winding of the magnet, interrupter springs, contacts IZQ, wiper m2 of the link sequence distributor, contacts .h2 and e2 to ground. Contact e3 prepares a testing circuit for the relay TL which will be operated when the'wipers of the order wire link circuit reach the bank terminals corresponding to the register in question. Thecircuit for relay TL will then be completed from battery, non-inductive winding of relay H, contact hl, e3, bank contact and wiper Zm, inductive and non-inductive Winding of the relay TL, wiper cZml of the link sequence distributor, to ground. Relay TL is equipped to operate and opens at Z2 the driving circuit of the magnet LM closing at the same time a circuit for the magnet DM through its own interrupter springs. The switch DM will take one step and open its own circuit at the wiper (lf/n2. Contacts ll close a locking circuit for the relay TL. Relay H has an inductive winding in multiple with the non-inductive winding and operates from the ground at tZl after the relay TL has lm?) (or Zmfl) through contacts jjll. When the relay N operates as already described a circuit is prepared for the magnet CWM through contacts nl and pl to ground so that when the order wire falls free the order wire switch UWM will step forward until its wiper ofwm makes Contact with the terminal marked by the contact h3 of the next waiting link which will be assumed to be that shown. In this position the relay P will operate opening the stepping circuit of the magnet CWM and closing the obvious circuit for relay PP at contacts pl. RelayPP provides alocking ground for relay P at contacts pp and prepares at 10102 a portion of the announcer circuit. Relay K operates in series with relay P and opens at k2 the operating circuit of relay N. Contacts icl open the non-inductive winding of the relay K to reduce the potential on the bank contact and wiper owm; contacts 7c3 transfer the operating circuit of the relay BB through contacts bbl and p2 over the order Wire, through the busy and listening key through the relay LN, to ground. Relay LN operates and lights a calling lamp CL. When the relay H operated a circuit was prepared for the relay G, contacts jj, 101'8 (or M9) wiper cfmQ (or cya/m4). If the switch CFM is standing on a set of terminals leading to exchange I and the relay JJ has been operated to indicate that the call is going to exchange II, a circuit will be completed for the relay G over the Wipers cfml and -in a similar way if the switch CFM is standing on a set of terminals leading to the exchange II and the relay JJ has not been operated because the call has to be extended to the exchange I, then a circuit will be completed for relay G over the wiper @fm2 It will be understood that ground is connected to the bank terminals associated with wiper cfmQ on those outlets leading to exchange II whereas ground is connected to the bank contacts associated with the contacts cfmt on those outlets leading to junctions extending to exchange I.

The operation of relay Gr closes the stepping circuit of the magnet CFM through its interrupter springs, hr3, gl, ml, bl, to ground causing the switch CFM to continue stepping as long as the relay G remains operated. Hence the switch will be driven round to the first junction to the required exchange. Contact h5 closed a circuit for relay WV through contacts 824 and relay WV consequently closes a circuit for relay Y through contacts wl.

`When the operator throws her listening key she vopens the circuit of relays BB Yand LN: Relay BB prepares at Z162 a circuit for the relay SA over contacts 7a4, 8e2, hb2, to a starting cam which is connected to ground and associated with the announcing mechanism. IVhen the cam completes the circuit relay SA operates and locks over its second winding and contacts sal to a second cam.

Contact sai' closes a circuit from ground through the repeating coil in the order wire, contacts 29372, wiper and bank Contact` owml, the wiper and bank contact Zml, contact 8d2, wiper and bank contact M138, contact m7, jj, to the announcing mechanism. In this position arrangements can be made to send to the `B operator the name of the exchange to which the call is to be transmitted it it is desired to tandem the call. If the call is for a subscriber connected to the exchange served by the B operator, it will be unnecessary to announce any terminating exchange. As already explained, the relay SA is held operated by a cam on the announcing machine and this device prevents the relay SA operating to clip an announcement. The operation of relay SA also closes the circuit or the magnet RMS through contacts 30.7, bank contact and wiper YM1137, toground and when the relay SA releases at the end of the preliminary announcement, the switch RMB advances one step. Belay SA reoperates and the order Wire is connected through contacts sa, ma, and the particular combination of relays MB, MC and MD indicating the thousands number to the announcing mechanism. At the end of the irst announcement, relay SA releases advancing the switch RM?) to posit-ion 42 in which position the hundreds digit is announced. In position 43 no announcement is made in order to provide a pause between the hundreds and tens digits. In positions 4:4 and 45 the tens and units digits are announced respectively.

Should it happen that all the four relays MA-MD or DA-DD are operated, the order wire will be connected through contacts co6 oreal to a terminal of the announcing mechanism which will announce the word double. Consequently if, for example, the number 4477 is diailed, the announcement will be double el, double 7 but if the number i774 is dialled, the number will be announced in the ordinary way.

The announcements are repeated over the order wire to the operators telephone circuit and on completion, the B operator will test the required subscriberls line. It the line is busy, the B operator will throw the busy key associated with the order wire thereby connecting battery to the order wire Which will be extended over contacts p2, wiper and bank contact ofwm, wiper and bank contact ZmQ, contacts bbl, to the winding ot relay BT and ground. The operation of relay BT will cause the operation of relay BR in the repeater by the contacts cr, e5, btl. Relay BR introduces the relay AR over the subscribers loop and contacts 0T2, dri., h2 and 5713.' Relay AR provides a holding circuit for the relay BR at arl and busy tone is passed to the calling subscriber through the tone condenser, contacts m12, hr3 and the talking condenserto the subscriber-s loop. The operation of relay BR also releases relay A as described below to release the register.

It' the required subscribers linel is free, the B operator will insert the calling plug thereby causing the operation of relay S from bat ery, supervisory lamp SL, winding of the relay S, sleeve oit the plug and jack, to ground. The supervisory lamp SL will light and a circuit is prepared for ringing the required party through the contacts si. At S2 a ground is extended through contacts W2 and one side of the repeating coil to the positive leg. This ground potential terms a signal to the automat-ic oiiice to indicate which cord circuit has been selected by the B operator.

Meanwhile the switch RMB has l een caused to advance to position 50 due to the intermittent operation of relay SA; this time interval has been inserted so that switch CFM should not begin to hunt before the B Operator has seized a junction. In position 50 a circuit is closed for relay SZ over the bank contact and wiper rin-38, contacts 8c2, to ground. Relay SZ opens at S22 the operating circuit of the relay SA to prevent that relay operating again. Contacts sel open the locking circuits of the various storage relays MA-MD etc. It will be remembered that relays NV and Y were operated when the relay H operated. The operating circuit of relay lV is opened by contact azi and this relay releases thereby opening the circuit for relay Y which also releases. lVhen relay Y has restored a circuit is reclosed tor the relay IV through contacts h5, 8e4, y2, ml, l to ground. Relay IV is, however, slow to operate and during this period a circuit is prepared for the relay M through contacts g/l, g3, 3.25, cr, the positive wiper cfml, to the vjunction line on which the switch CFM is standing. It this junction is not the one selected by the operator, relay M cannot operate and after the relay WV has operated, relay Y will operate opening the circuit ot the relay M. Relay Y is also slow to operate and during the period of this operation a circuit is closed for magnet CFM through contacts hr4, 828, Iw3, g3, ml, bl, to ground. This circuit is opened at g3 at which time the magnet takes one step forward. Contacts y2 open the circuit of relay IN which will release unless maintained by the contacts g2. Relay Cr has a possible circuit through conltacts 7a4, jy', 7:78 (or 7629) and the wiper @fm2 (or eff/ni) to ground extended to the bank contacts by the contacts (or tr) of some other repeater switch. This ground potential will exist it the junction line on which the switch CFM is standing is engaged and the operation of the relay G besides maintaining the circuit of relay lll, as already explained, will close an operating circuit for the magnet CFM through its interrupter springs, contacts hr3, gl, mi, bl,

to ground. In this way the switch CFM will be caused to step immediately over any junction which is in use and to test each disengaged junction by connecting the relay M to the positive leg of the junction. `When the junction selected by the B operator is reached, relay M will be operated and a locking circuit will be closed immediately through contacts m1, bl, to ground.

Relay M closes at its contacts m2 a circuit tor the relays HR and BR through contacts cr and through contacts tl, e5, cr. The relay BR introduces the relay AR as already explained, whereas the relay HR opens the busy tone circuit at hr3 and closes at lire a circuit from ground through relay ER, contacts M5, negative side of the junction, one side ot the repeating coil, winding ot relay L to battery. Relay ER provides a locking circuit for the relay HR at contacts er1, and prepares at W2, a circuit for the relay DR. Relay L in the B cord circuit shunts the supervisory lamp SL through contacts Z1, trl, W1, the negative and non-inductive windings of the relay R in multiple to battery. Relay R will operate introducing the ringing supply through the ringing relay TR, contacts r1., sl, subscribers loop contacts r2, to ground. lhlhile the ringing is taking place the register will release due to the tact that the operation of contacts hr3 open the circuit for the relay A. Relay A opens at al, a circuit `for relayB. Relay B vopens at bl a fundamental ground circuit permitting the remaining relays to release. RMS steps to its home position through its interrupter springs, contact-s 5225, b3, sa?, bank contact 50 and the wiper RMS?, to ground. The opening of contacts Z266 causes the release of the relay KR but the repeater is maintained busy7 because the test circuit is held open by contacts hr1, and bri. Contacts hr2 and /tr maintain a ground potential on the bank contacts corresponding to the junction taken into use to prevent intrusion. Wlhen the called subscriber replies the relay TR trips opening the short circuit around the relay RR and this relay operates in series with the relays R and S. Contacts W1, short circuit the relay R which now releases switching over at contacts rl and4 r2 the subscribers loop from the ringing supply to the talking bridge and thereby causing the operation of the relay CS. Contacts W2 and esl connect battery potential to the positive side of the junction thereby causing the operation of relay DR in the repeater through contacts hr3 and W2. Relay DR reverses the battery supply to the calling subscriber over contacts (Zrl and (Zr) and the connection is now established.

After the B operator has inserted her plug it is essential that she does not receive a further call until the first connection has been completed between the outgoing re- The switch' peater and the junction and on this account the order wire circuit is locked to the register by relay P which remains operated in series with relay K so long as the relays H and E remain operated. l/Vlien the relay AR in the repeater operates and releases the register the order wire and order wire link circuits are also released and the order wire makes connection with any other register which has a call awaiting announcement. Such a condition would be signalled by the fact that a register had made connection with an order wire link circuit thereby placing ground p0- tential on the wiper Zm of the latter causing the operation of the relay N. It should be understood that all calls to be announced to a particular distant exchange will be stored in sequence in order wire link circuits allocated to that particular junction group. Should the junction group be sutliciently large to justify the use of two order wires, both OVM switches will search over the same group of order wire link circuits, the waiting calls being handled in rotation. The use of the discrimination offered by the relay J J may be extended to the order wire link circuit to enable these circuits to be common to two exchange The starting signal and testing condition is duplicated over the wipers im@ and Zm, Zmd and Zm.

During the time theswitch CF M is hunting for the junction chosen by the operator a tone is connected through the bank contact and wiper Km2, bank contact and wiper 0107112, contacts p2, both sides of the order wire to the operators telephone circuit in order that the operator may know the condition at the automatic exchange and if necessary change the cord circuit.

Should the operator Jfail to dial the necessary digits into the register or delay the dialling beyond some predetermined period, an alarm will be given in the following manner z-lVhen the relay BB operated, ay circuit was extended from battery, one winding of the relay BT, the wiper and home position rml, contacts 22153, and 6M to an A pulse circuit. BT provides a locking circuit for itself through contacts M3 to ground at b1. Should the subscriber tail to dial, relay E will be operate trom battery, winding of relay E, contacts el, M2, to a Z pulse circuit, it being arranged that the Z pulse follows the A pulse after some fixed period ot time. The operation of relays E and BT close a circuit for the relay BR as is previously described. Relay BR introduces relay AR and applies busy tone. Relay BR also releases the register. A similar circuit ior the relay BT is established in positions l0, 2O and 30 in case delay may occur before the hundreds, tens or units digits. In position 50 the A pulse circuit is connected through contacts S26, a2, the Winding of relay a, bank contact 50 and wiper rm32 to battery. Relay Z locks at z2 and prepares a circuit over contacts .e3 for the Z pulse circuit to the relay BT. It the relay BT operates in position 50, BR in the repeater will be operated as already described, relay E having been operated in position l() and locked up. The circuit for the switch CF M is arranged so that it will hunt continuously, stepping over all engaged junctions or junctions leading to a second exchange without testing and the use of the time pulse circuits in position 50 serves to release the register and the B operator, if the switch CFM fails to find the Y junction selected within some predetermined period. It will also be seen that the B operator can apply the busy tone by operating the busy key at any time, such an operation causing BT to operate BR and release the register.

Vhen the callingr subscriber releases relay AR falls back and opens the circuit for the relay BR. Contacts brel remove the holding ground from the hold wire permitting the preceding switches to release. The relays ER and DR remain operated to the B cord circuit. When the called subscriber releases, relay CS falls back disconnecting the battery from the positive side ot' the junction and thereby opening the circuit of relay DR. Relay DR opens at contact Z713 the circuit for relays ER and L. Relay ER opens at er1 a circuit for relay HR and relay L opens at contacts ll a circuit for relay RR and reintroduces the ysupervisory lamp SL. Relay RR connects ground to the positive wire, through contacts W2 and s2 thereby providing a holding circuit for relay HR until the operator pulls out the plug permitting relay S to release.

If it is desired to use a split order wire position, one relay LN will be provided 'for each ofhce terminating in the split position. Each relay LN will be provided with its own calling signal and key. It is possible, therefore, for a split position to operate certain junctions from manual exchanges and others from automatic exchanges. Where necessary it will be arranged that the switch RM3 will announce the calling exchange name in order wire when connection with the manual exchange has been made.

2. A telephone exchange system comprising an automatic exchange and a manual exchange, junctions and an order wire extending between the two exchanges, register means controlled during the setting up of a call from a subscriber at the automatic exchange to the manual exchange to automatically select an order wire and means controlled by said register means for automatically sending voice frequency currents over said order wire to announce the wanted number to an operator at the manual exchange.

3. In a telephone exchange system, an automatic exchange and a manual exchange, junctions and an order wire extending between the two exchanges, register means controlled during the setting up of a call from a subscriber at the automatic exchange to the manual exchange for automatically selecting an order wire, means controlled by said register means for automatically sending voice frequency over said order wire, and means associated with the order wire to transmit back a busy signal from the manual exchange to the automatic exchange.

l. In a telephone exchange system, an automatic exchange and a manual exchange, a group of trunks between said exchanges, an order wire between said exchanges, a plurality of digit registers associated with the trunks outgoing from the automatic exchange to the manual exchange to store the numerical portion of the wanted subscribers designation, means for connecting a register to an order wire, and a call announcing mechanism associated with the said plurality of registers to announce the wanted subscribers designation over the order wire under the control oi the register to which the order wire is connected.

5. A telephone exchange system comprising an automatic and manual exchange, a group of repeaters at the automatic exchange having access to junctions extending to one or more manual exchanges, order wires extending to said manual exchanges, registering mechanism adapted to record a wanted number associated with said repeaters, means controlled by said register mechanism to transmit an indication thereof over an order wire extending to a manual exchange, and means provided for operatively associating said registering mechanism with a predetermined one of said repeaters to the exclusion of the remainder.

6. In a telephone exchange system, an automatic selecting stage, different paths of access to said stage, a plurality of groups of outlets selectable at said stage, means for controlling the selection of said outlets depending upon the path of access to said stage.

7. A telephone exchange system, comprising step-by-step switches, a selecting stage, a

plurality'o'f groups of outlets selectable at said stage, means tor transmitting impulses to said switches, and means for controlling the selection or" said outlets independent of said impulses.

8. ln a telephone exchange system, an automatic exchange and a plurality of groups of junctions leading to manual exchange, an outgoing numerical stage at the automatic exchange, a. group ot trunks, the outgoing numerical stage of the automatic exchange is adapted to be seized Via a plurality ot paths ot' access from said stage equal in number to said junction groups, and means controlled at said numerical stage to select a trunk which is in turn connected to a junction in particular one of the groups of junctions in accorciance with the path ot access to said trunk.

9. A telephone exchange system comprising an automatic exchange and a plurality of groups ot junctions leading to manual exchanges, a numerical selecting stage at the automatic exchange, trunk circuits, means controlled at the numerical selecting stage at the automatic exchange to select said trunk circuits and associating them in common with plurality ot groups of junctions.

10. ln a telephone exchange system comprising a group of trunk circuits associated with a group of digit registers, a selector stage and a plurality of paths having access thereto, means whereby any one of said circuits can be reached over a plurality of paths of access from a selector stage, and means to extend it to any one of a number of groups "f ot different paths of access from said selecting stage, a group of registers associated with said trunks, a plurality of groups of junctions outgoing from the automatic exchange to a. number of manual exchanges equal in number to the said paths of access, a plurality of order wires from said automatic exchange to said manual exchanges, means whereby a register taken into use in setting up a connection is automatically connected to an order wire outgoing in a predetermined direction in accordance with the path of access to the register, and means whereby the outgoing trunk which is also used in the connection is automatically connected to the outgoing end or a particular junction which has been taken into use at its incoming end at the manual exchange reached over the order wire.

12. A telephone exchange system comprising an automatic exchange and a plurality of groups of junctions extending' to two or more manual exchanges, single motion switches at said automatic exchange, and means controlled by said switches which are adapted to extend connection to a junction of a wanted group by the exercise of a hunting operation only.

13. A telephone exchange system comprising an automatic exchanffe and a plurality of groups of junctions extending to two or more numerically different positions at the same exchange, single motion switches at said automat-ic exchange, and means controlled by said switches which are adapted to extend connection to a junction of a wanted group by the exercise of a hunting operation only.

14. In a telephone exchange system, the combination of an automatic and a manual exchange, an outgoing selecting stage at the automatic exchange, a trunk circuit and an associated register. means at said selecting stage to select said trunk circuit, an order wire, means for connecting said register with said order wire to the manual exchange, a call announcing device common to a plurality of registers, and means for connecting said device to said register for announcing the wanted number over said order wire.

15. A circuit arrangement as claimed in claim 3 characterized in this that in response to said signal busy tone is connected to the calling subscriber.

16. A circuit arrangement as claimed in claim 3, characterized in this that in response to said signal, the order wire is automatically released.

17. A circuit arrangement as claimed in claim 3, characterized in this that in response to said signal, the register is automatically released.

18. A circuit arrangement as claimed in claim 4c, characterized in this that calls incoming to the group of registers are connected to the order wire to the wanted exchange in their order of arrival.

In witness whereof, we hereunto subscribe our names this 18th day of September 1930.

ESMND PHILIP GOODWIN WRIGHT. LESLIE BAINES HAIGH.

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