BE372322A - - Google Patents

Description

       

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  BQlRFE3'0IOFIIIXiàtÎ'OS AUX SYSTEMS T: EL1WHo: nQ, UES FOR AUTOPTICAL CENTRAL OFFICES OR s% iiI-AU'00i, ikTl 1quels.



   The invention relates to automatic or semi-automatic central office telephone systems, and more particularly relates to systems in which order lines are used. These lines are usually used as operators located in different manual offices, so that they can communicate to each other the particular information concerning the calls which must be established between these offices.



   It has also been proposed to establish order lines between automatic and manual offices, and in these arrangements an order line to the requested manual office is auto-
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 matically chosen during the establishment of a call from an automatic subscriber. they are to such arrangements as the invention relates to.
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  According to one of the characteristic facts of the inveutlon, 16s

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 Order lines from an automatic office to a manual office include a single pair of conductors.



   According to another fact characteristic of the invention, phonic frequency currents are automatically sent through a chosen order line and connecting the automatic office to the manual office, during the establishment of a call between these offices. . This line is suitable for transmitting a busy signal from the operator of the manual office to the automatic office, in response to a maneuver by this operator.



   According to yet another fact of the invention, a selection step in an automatic office is. provided to choose a group of outgoing circuits from a certain number of similar groups only in concordance with the access path.



   In the embodiment described below, the automatic office is of the common control derivative path type, that is to say that in this office each step chosen includes a seeker-type conversation switch and a switch. derivative through which the connection is first established, this derivative switch controlling the operation of the talk switch.



   Figure 1 gives a diagram of the envisaged system. To make a call to a manual office, the subscriber of the automatic office marks the number of the requested subscriber on his dialing disk.



  In response to the marked digits, a start selector step is reached, and a branch switch R2 selects a free start repeater RP with which a free register RG is associated. The remaining digits are received in the recorder, and the outgoing talk switch is connected to the repeater. One or more command lines are adapted to be connected to the recorder by a series of LC connection circuits which are arranged to be used in turn by the distributor switch LD.



    The purpose of this is that the calls that must be communicated through one or more order lines, are transmitted to them in the

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 order of arrival. up.J! dthe recorder has been connected to a determined LC circuit, and when the desired order line becomes free, a connection is established between the order line and the control circuit.
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 nexion. A signal is then sent to the operator of the manual office who activates her listening key.

   The recorder is associated with a common call annunciator mechanism, and in response to the
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 operation of the operator, the recorder o: ¯;. controls the transmission of the number of the subscriber requested through the order line to the operator's set.



   If the attendant finds that the called subscriber is busy,
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 it '1.operates an ocCUpatiOI1 key associated with the order line.



  In response to this maneuver, an auditory busy signal is sent from the recorder to the calling subscriber, and the recorder
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 as well as the order line, are eutomatically released. If, on the contrary, the call can be served, the attendant chooses an individual end cord circuit at a free trunk line of a group of similar lines of the automatic office, and in-
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 troducts the string in the requested line.

   - Jet you maneuver marks the junction line in the banks of a CF searcher switch associated with the repeater, which is arranged in such a way that after a determined time interval, after the transmission of the number of-.
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 On Tuesday, the CF search movement takes place, This time interval is determined by the average time it takes for an opera
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 trioe to try and connect a paid line. When the CF searcher switch has made the connection with the trunk line, the recorder and the order line are released.
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  ¯, 8 even r-'J! Ser'1b dp repeaters and associated recorders can be reached from the starting selector team in response to a series of digits. In the particular embodiment described here two access points are common, a relay JJ being activated if one of these paths is used. In this case, the recorder and the CF switch will have access respectively to a series

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 of order lines and groups of trunk lines to different central offices or to different positions at the same central office.

   Corresponding to the path to repeaters, an order line in the. desired direction is chosen, and the CF finder switch searches only the selected group of trunk lines. If the requested office is a tandem office, it may be necessary to announce the name of the requested office in addition to the number of the called subscriber. The recorder is arranged so that in accordance with the path, an office designation or some other suitable indication can be sent from the call announcer, or different designations can be transmitted. In addition, the access path can control the choice of different positions at the tandem desk.



   If the work in shared order lines takes place at the manual office, and if order lines arrive at the same position from the manual offices and. automatic, it is desirable, in order to obtain uniformity in the maneuvers for sending the indications, that the name of the calling office be transmitted from the automatic office. This can be done in the arrangement described.



   Further particular facts of the invention are better understood from the following description based on Figures 2 to 6. In these, Figure 2 shows a repeater circuit comprising a non-digital switch which allows the repeater to be used. in conjunction with any one of a number of junction circuits. These, which end at this switch, extend to two different central offices, or alternatively to two different positions of operators of the same office.



   Figure 3 shows a recorder circuit associated with a number of repeater circuits similar to that shown in fig.2. The recorder is arranged to receive four digits and is multiple linked with other recorders to a common annunciator mechanism which announces different designations, independent of the operation of any recording circuit.

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 particular tror.



   Fig. 4 shows a command line Junction circuit which serves for the purpose of connecting the recorder to the desired command line. A combiner distributor for trunk circuits is also shown in fig. 4 and controls the combiner in which a determined order line connects with recorders waiting to announce a call.



   FIG. 5 shows a trunk circuit for an order line modified to receive calls from an automatic central office, repeater circuits and. recorders are tested and chosen simultaneously through the order line, the contacts hrl, brl, krl of the repeater, the contacts bb6, the rest position, and the combiner in which any particular order line is connected with recorders, waiting to announce a call. This figure 5 shows the incoming end of a trunk line at the manual office.



     Fig. 6 relates to a modified trunk circuit for an order line, capable of receiving calls from an automated office.



   The repeater and recorder circuits are tested and chosen simultaneously through the command line, the contacts hrl, brl, krl of the repeater, the contacts bb6, the rest position, the rm32 balance, and the battery. The operation of the test relay in the previous switching step causes the extension of the pulse circuit to the recorder in order to bring on the excitation of relay A.

   It should be observed that the test circuit which has been described is used for any one of a series of trunk lines which can be reached through the non-digital step associated with the repeater. When these junction lines lead to two different offices, it is necessary to make any distinction whether a junction line in the desired group is chosen. For this reason, the recorder is provided with a circuit

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 tinctive activated through the access path by means of which certain relays are controlled.

   If, for example, the trunk lines lead to offices I and II, it is assumed that the necessary distinction is obtained by the office code digits received by the previous switching step, and that on the contrary , relay A will be activated only when office I is required.



   Relay JJ will be actuated in series with relay A when office II is requested. Relay A closes a circuit for relay B in al, and rela.is B is energized from the previous derivative path. The circuit for relay A is then held across contacts bb3, kr2, br3, dr2, the pulse circuit drl, br2, and earth. when relay A responds to the pulses marked on the disc, a stepping circuit is closed for the electromagnet. RM3 through: contacts c4, b2, the coil of relay C, al, and earth. Rela.is C is of the slow recovery type and remains energized throughout the pulse train.

   Switch RM3 advances its brushes one step for each pulse received, and when relay C neutralizes at the end of the pulse train, a circuit is closed therethrough. battery and the non-inductive resistor connected to the bala.i rm32 through the contacts of the bench in any of the positions 2-9, the winding of the relay Z, the contacts z2, cl, b4, the brushes rm33, rm34, rm35, rm36, and the contacts of the relative bank, to cause the operation of the combination of relays MA, MB, MC, MD which corresponds to the numbers marked on the disk.

   Relay Z is energized in series with recording relays MA, MB, etc. , but it is of the slow operating type, and therefore the recording relays close their blocking circuits through contacts sz1 and bl and earth, before contacts z2 are opened. A circuit is also provided when the relay Z is energized for the electromagnet RM3 through its switch contacts, the contacts zl, the contact bank and the rm37 brush, towards the earth, which causes the advance. from switch to sa. position 10. The second train of pulses brings about a similar operation, combining it

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 its corresponding relay CA .. CD (not shown) being blocked to record the marked digit on the disc, and the switch RM3 goes to its position 20.



   If the thousand and hundred digits recorded by the MA-MD and CA-CD relays are the same, a circuit extends through tra. towards the battery, the rm32 brushes, the bank contact 20, the ca2, ma2, mb2, cb2, oc2, mc2, md2, cd2, cl, b4 brushes and the rm33, rm34, rm35, rm36 brushes. This causes any of the relays which are currently inactive to operate. The third set of pulses acts on a combination of DA-DD relays (;. On shown) and this causes the RM3 switch to advance to its position.
30, while the fourth set of pulses causes similar operation of the UA-UD relays (not shown). The RM3 switch goes to its 40 position.



   If the third and fourth digits are the same, a circuit is closed through the contacts ua2, da2, db2, ub2, uc2, dc2, dd2, ud2, to cause the operation of any of the DA-DD relays which would otherwise remain inactive.



   In position 40 ur: circuit is also closed for relay E through the battery, the winding of relay E, contacts ol bt2, sa7, brush rm38, sa2, and earth. Relay E is blocked through contacts el and bl, and earth. At contact 12 a circuit is closed for the electromagnet of the LM command line connection circuit: battery, motor solenoid winding, switch springs, contacts t12, distributor brush dm2 Combiner of connection circuits, contacts h2 and e2, and earth.

   At contact e3, a test circuit is prepared by the TL relay which is actuated and the brushes of the command line connection circuit reach the terminals of the bench corresponding to the recorder in question. The circuit for the TL relay is then complete: battery, non-inductive winding of relay H, contact hl, e3, bank and brush contact lm7, inductive and non-inductive windings of the re-

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 lais TL, ba.lai dml of the connection circuit combiner distributor, and the, earth.

   The TL relay is equipped to operate and open at t12 the motor circuit of the LM electromagnet, at the same time closing a circuit for the DM electromagnet through its own switching springs. The DM switch moves one step and opens its own circuit at the dm2 belai. The tll contacts close a blocking circuit for the TL relay. Relay H has an inductive winding in multiple with the non-inductive winding and energizes through earth at tll after relay TL has energized.

   Contact hl opens the non-inductive winding of relay H, reducing the potential on the brush bank contact lm ?, Contact h2 connects the. start-up earth through contacts k2, jj5, the bank contact and the lm5 (or lm6) brush to relay N of the. starting order line. The h3 contacts place a potential marker on the bench contact and the lm3 (or lm4) brush through the contactajj4.

   When the relay N is energized, as has already been described, a circuit is prepared for the OWM electromagnet through the contacts nl and pl towards the earth, so that when the order line becomes free , the OWM switch advances its own3 bolts which make contact with the terminals marked by the contact h3 of the standby connection circuit, which is assumed to be this indicated. For this position, the relay P is energized, opening the step by step circuit of the electromagnet OWM and closing the circuit of the relay PP to the contacts pl. The PP relay provides a blocking earth for the P relay at the pp3 contacts, and it prepares in pp2 part of the annunciator circuit. Relay K is energized in series with relay P and opens in k2 the operating circuit of relay N.

   At contacts kl the non-inductive winding of relay K is open to reduce the potential on the bank contact and the brush owm3. Contacts k3 transfer the control circuit of relay BB through contacts bbl and p2 on the command line, through occupancy and listening keys, relay LN and earth. The LN relay energizes and turns on a CL call lamp. Quard

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 relay H is energized, a circuit is prepared for relay G, through contacts jj3, kr8 (or kr9) and the brush cfm2 (or cfm4).



   If the CFM switch is turned off on a set of terminals leading to office I, and relay JJ has been energized to indicate that the call is for office II, a circuit is closed for relay G across the terminals. cfm4 brooms. Similarly if the CFM switch is turned off on a set of terminals leading to office II, and relay JJ has not been energized because the call is for office I, an Ait wax is completed for relay G through the cfm2 brush.

   Or. Must observe that the earth is connected to the terminals of the bench associated with the cfm2 brush on the outgoing circuits leading to office II, while the earth is connected ...; - connected to the contacts of the bench associated with cfm4 brushes on the outgoing circuits leading to the junction lines extending towards office 1.



     'The operation of relay G terminates the step by step circuit of the CFM electromagnet through its switching springs, the contacts kr3, g1, m1, b1, and earth. The CFM switch also continues to advance 10: [while the relay G remains energized. So the switch turns to the first trunk line going to the requested office. Contact h5 closes a circuit for relay W through contacts sz4, and relay W therefore closes a circuit for relay Y through contacts wl.



   When the attendant lowers her listening key, she breaks the circuit of the BB and LM relays. The BB relay prepares in bb2 a circuit for the SA relay through the contacts k4, sz3, bb2, towards a start ring which is connected to earth and is associated with the annunciator mechanism. When the cam completes the circuit, the SA relay energizes and locks up through its second winding and the sal contas to a second cam. The contact his? closes a circuit through: the earth, the repeater coil in the command line, the PP2 contacts, the brush and the contact of

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 bench lml, the contact sa2, the brush and the bench contact rm38, the contact sa7, jj6, verle annunciator mechanism.

   In this position, arrangements can be made to send to operator B the name of the office to which the call is to be transmitted if it is a tandem call. If the call is for a subscriber connected to the office served by operator B, it is not necessary to announce which office is terminated, Corune this has already been explained, the SA relay is now energized by a cam on the annunciator mechanism, and this device prevents the SA relay from operating the annunciator.

   The activation of the SA relay also closes the circuit of the solenoid RM3 through the contacts sa7, the bank contact and the brush rm37, towards the earth, and when the SA relay is released at the end of the preliminary information, the switch RM3 advances one step. The SA relay operates again and the command line is connected through the contacts sa6, ma3, and the particular combination of relays MB, MC and MD, indicating the number of miles to the annunciator mechanism. At the end of the first information, the SA relay is neutralized, advancing the RM3 switch to position 42 for which the hundreds digit is marked. For position 43, no information is given in order to provide a pause between the digits of ce:: groins and tens.

   For positions 44 and 45, the tens and ones digits are announced respectively.



   If all four MA-MD or DA-DD relays are energized, the command line is connected through contacts se..6 or sa.4 to a terminal of the annunciator mechanism which marks the word "double". Therefore if for example the number 4477 is marked on the disk, the information will be "double 4, double 7", but if the number 4774 is marked, the announced number will follow the ordinary path.



   The information is repeated through the command line to the operator's telephone circuit, and at the end Operator B tries the line of the called subscriber, If the line is busy

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 Operator B activates her occupation die associated with the league
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 order, 2oni-iejtart thus the battery h, this line which is extended through the contacts p2, the brush and the bench contact owm2, the brush and the bench contact 1m2, the contacts bbl, towards
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 The winding of the LV relay and the earth. The energization of the LV relay causes the energization of the BR relay in the repeater through the contacts kr5, e5, btl. The BR relay feeds the AR relay through the subscriber circuit and the br2, drl, dr2, and br3 contacts.



  The relay AR provides a blocking circuit for the relay BR eu arl and an auditory busy signal is sent to the calling line through the capacitor, the contacts ar2, hr3 and the talk capacitor, and the circuit of the subscriber. The energization of the relay BR also releases the relay A as described below to release the recorder.
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  If If -Line of <: tbollJ: é dema.1dé is free, operator B inserts 1n calling card into the jack of this line, which causes the relay to be excited: battery, lamp I s1pervisionsL, in- 10'Jl <: 'l! 1eJ.t of relay S, seal of plug and jack, and earth.



  I.8 supervision lamp SL came on, a circuit is prepared to ring the subscriber called through the contacts sl. In s2 an earth is connected to the contacts rr2 e: on one side of the repeater coil
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 towards the positive coi-iduoteàr. This earth potential constitutes a signal to the automatic office to indicate which cord circuit has been chosen by operator B.



  During this period the switch RM5 has turned to position 50 due to intermittent operation of the SA relay.
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 This time interval has been planned so that the CFM switch does not start its searches until Operator B has chosen a trunk line. For position 50, a circuit is closed for the SZ relay through the bank contact and the rm38 brush, the sa ?, and earth contacts. The SZ relay opens in sz2 the control circuit of the SA relay in order to prevent the remake .. 'operates
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 again. Contacts szl o, .tVrel ..; the di-

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 must to MA-MD recorder relays etc.

   It / be reminded that the relays
W and Y are energized when relay H is energized. The control circuit of W is opened at contact sz4, and this relay is neutralized, opening the circuit of relay Y which will also be deactivated. A circuit is then closed for the relay W through contacts h5, sz4, y2, ml, bl, and earth. The relay W is however slow operative, and during this period of time a circuit is prepared for the relay M through the contacts yl, g3, sz5, kr7, the positive brush cfm1, to the junction line on which the CFM switch. is established. If this junction line is not the line chosen by the attendant, relay M cannot operate and after that the relay
W worked, relay Y energizes, opening the relay circuit
Mr.

   Relay Y is also slow to operate and during. During this operation, a circuit is closed for the CFM electromagnet through the contacts kr4, sz3, w3, y3, ml, bl, and earth. This circuit is opened at y3 when the electromagnet takes a step forward. Contacts y2 open the circuit of relay W which neutralizes unless it is kept energized by contacts g2.



   Relay G has a possible circuit through contacts h4, jj3, kr8 (or kr9), and the brush cfm2 (or cfm4) to the earth connected to the bank contacts by the contacts hr2 (or hr5) of someone other repeater switch. The earth potential exists if the trunk line on which the CFM switch is stopped is busy, and the operation of the relay G maintains the circuit of W, as has already been explained. A circuit is closed for the CFM electro-aimsnt through its switching springs, the contacts kr3, gl, ml, bl, and earth.

   In this way, the CFM switch immediately moves past any trunk line that is in use, and tries each free line by connecting relay M to the positive side of the trunk icon. When the trunk line chosen by operator B is reached, relay M is energized,. And a blocking circuit is closed immediately through contacts ml, bl, and earth.

   Relay M closes at its contacts

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 m2 a circuit for the HR and BR relays through the contacts kr6, btl, e5, kr5. The BR relay introduces the AR relay as has already been explained, while the HR relay opens the auditory occupancy signal circuit in hr3 and closes a circuit through hr4 through the earth, the ER relay, the br5 contacts. the negative side of the junction line, one side of the repeater coil, the coil lift of the relay L, and the battery.

   The ER relay provides a blocking circuit for the HR relay at the erl contacts, and prepares in er2, a circuit for the DR relay. Relay L in the cable circuit of operator B shunts the supervision lamp SL through contacts 11, trl, rrl, the negative and non-inductive winding of relay R in multiple, and the battery. Relay R energizes, introducing the ringing current source through the bell relay TR, contacts rl, sl, subscriber circuit contacts r2, and earth. While the subscriber is ringing, the recorder is restored to the normal position due to the fact that the operation of contects br3 opens the circuit of relay A.

   This opens in al, a circuit for relay B, which opens in bl a fundamental circuit to the earth, allowing both the remaining relays to neutralize. The switch RM3 advances towards its rest position through its switch springs, the contacts bb5, b3, sa ?, the bank contact 50, the brush RM37, and the earth. Opening contacts bb6 causes relay KR to reset, but the repeater is kept busy because the test circuit is kept open at contacts hrl and brl. The hr2 and hr5 contacts maintain an earth potential on the bank contacts corresponding to the junction line taken in use in order to avoid any interference.

   When the called subscriber answers, the relay TR causes the opening of the short-circuit to + or the relay RR, and this relay is energized in series with the relays R and S. The contacts rr1 short-circuit the relay. relay R which now counts through contacts rl and r2 the circuit of the subscriber from the ringing current source to the derivative circuit of conversation, which causes the operation of the

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 CS relay. Contacts rr2 and csl connect the battery potential to the positive contact of the junction line, thus causing the relay DR in the repeater to operate through contacts hr3 and er3.

   The DE relay reverses the battery supplied to the calling subscriber through conta @ ts dr1 and dr2, and the connection is now established.



   After Operator B has inserted her plug, it is impor- tant as long as she does not receive another call until the first connection has been completed between the outgoing repeater and the trunk. To this end, the command line circuit is blocked at the recorder by relay P which remains energized in series with relay K as long as relays H and 2 remain energized. when the AR relay in the repeater operates and releases the recorder, the command line and the connection circuits of this line are also released. The order line then connects with any other recorder that has a call waiting.



  Such a condition is signaled by the fact that a recorder has made a connection with a connection circuit of a command line, thus placing an earth potential on the brush lm5 of the latter causing the operation of the N relay. observe that all calls to be announced to a particular remote office are stored in series in the connection circuits of the order lines reserved for that particular junction direction.

   If the group of trunk lines is large enough to justify the use of two order lines, the two OWM switches search through the same group of trunk lines for order lines, the waiting calls. being served relatively. The use of the distinction offered by the JJ relay can be extended to the order line connection circuit to allow these circuits to be common to two offices. The signal starts up and the test condition is doubled through the 1m6 and lm5, 1m5 and 1m3 brushes.



   While the CFM switch searches for the trunk line

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 tion chosen by the operator, an auditory signal is connected through the contacts sz7, the bench contact and the lm2 brush, the bench contact and the owm2 brush, the p2 contacts, both sides of the line order, to the operator's telephone circuit, so that the latter is informed of the condition existing at the automatic office, and if necessary can change the cord circuit.



   If the subscriber does not mark the desired digits on his disc in the recorder, or delays this maneuver beyond a determined period of time, an alarm signal is given as follows: When the relay BB is energized, a circuit has been extended through: the battery, a winding of the LV relay, the brush and the rest position rm3l, the contacts bt3 and bb4 towards a pulse circuit "A". The LV relay provides a blocking circuit for itself through the contacts bt3 and the earth in bl. If the subscriber does not operate his risk, the relay will be energized: battery, winding of relay E, contacts el, bt2, towards a "Z" pulse circuit. The arrangement is such that the "Z" pulse follows, the "A" pulse after a determined period of time.

   The operations of the relays E and BT close a circuit for the relay BR as has been previously described. The BR relay introduces the AR relay and applies an auditory busy signal. The BR relay also restores the recorder.



  An analogous circuit for the LV relay is established for positions 10.20 and 30 st. cases where the delay occurs before the hundreds, tens and ones digits. In position 50, the circuit "A" is connected through the contacts sz6, z2, the winding of the relay z, the bank contact 50, brush rm32, and the battery, The relay Z locks in z2 and prepares a circuit through contacts z3 for the "Z" pulse circuit to the LV relay. If the LV relay operates in position 50, BR in the repeater is actuated air. If this has already been described, relay E having been energized in position 40 then blocked.

   The circuit for the CFM switch is arranged in such a way that it continually searches, advancing through all

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 junction lines engaged or junction lines leading to a second office, without testing. The use of the impulse circuits in position 50 serves to restore the recorder, and the set of attendant B if the CFM switch does not find the. junction line chosen within a determined time. It can also be seen that Operator B can send the auditory occupancy signal by pressing the. occupancy key at any time, this maneuver causing BT to energize BR and restore the recorder.



   When the calling subscriber hangs up, the AR relay neutralizes and opens the circuit for the BR relay. The br4 contacts move the earth away from the blocking conductor, allowing the previous switches to return to their rest position. The ER and DR relays remain energized at operator B's cord circuit. When the called subscriber hangs up, the CS relay is neutralized disconnecting the battery from the positive conductor of the junction line and thus opening the relay circuit. DR. This opens at contact dr3 the circuit of relays ER and L. Relay ER actually opens a circuit for relay HR, and relay L opens at contacts 11 a circuit for relay RR, which reintroduces the. SL monitoring lamp.

   Relay RR connects the earth to the positive conductor through contacts rr2 and s2, which provides a blocking circuit for HR until the attendant pulls out the plug, allowing relay S to neutralize itself.



   If it is desirable to employ a position for shared order lines, an LN relay is provided for each office served in that position. each LN relay is provided with its own call signal and key. It is therefore possible for such a position to achieve certain manual office junctions and other automatic office junctions. If necessary, the circuits can be arranged so that the switch RM3 announces the name of the calling office in position 40. This procedure '

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 will maintain the marl conditions for Operator B when it is
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 git of calls received from manual desks and automs-tic desks.



  CLAIM S.



  1 - Po, xr telephonic network system comprising a ^ utorr office: -. Iqu: and. a manual burpau, as well as one or more two-way order lines between the said offices, these lines possibly being ,, 0'.ne.; tees F1J.t): TIn "':. iqu ,: , iilent when a call is to be served between a subscriber of the automatic office and a subscriber of the manual office.



   2 - System for a telephone network, as claimed in 1, in which signals indicative of the designation of a requested subscriber are transmitted automatically through the command line.
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  3 - In a telephone network comprising an automatic office, a manual office, junction lines between the offices, and one or more order lines also between these offices, circuit arrangements are provided by which, during the
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 establishment 6 "at = call between a subscriber of the putomatic office and a subscriber of the manual office, an order line is automatically taken in use, characterized in that currents of phonic frequencies are automatically, sent through the order line .



   4 - In a telephone network including an office at
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 automatic, -a manual office, junction icons between the JX> bus and one or more order icons also between these offices, circuit arrangements are provided by which, during the establishment of a call between a subscriber of the sutomatic office and a subscriber of the manual office, an order line is automatically chosen, characterized in that the order line is adopted to transmit backwards a busy signal from the operator to the automatic office.
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  5 - A telephone network comprising: an automated office

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 tick; a manual desk; a group of junction lines between said offices; one or more lines of order between these offices; a series of registering numbers associated with connection circuits or repeaters starting from the automatic office to serve as a connection to the manual office and a.à adapted to register the. digital part of the designation of called subscribers; means for connecting a recorder taken in use in establishing a connection with an order line;

   and a call announcer mechanism associated with said series of recorders, which is adapted to announce the designation of the called subscriber through the order line under the control of the recorder to which the call line. order is connected.



   6 - Telephone system in which a group of repeaters placed in an automatic office have access to trunk lines extending to one or more manual offices, and are associated with a recorder mechanism adapted to register a requested number and transmit a indication through an order line extending to a manual office, and in which means is provided for associating said recording mechanism with one of said determined repeaters, excluding the remaining repeaters.



   7 - In or for a telephone system, an automatic selection step in which the selection of a group of a certain number of outgoing circuit groups is proudly controlled in accordance with the access path towards the said stage.



   8 - In or for a sutomatic telephone office with switches of the so-called step-by-step type, a selection step in which the selection of a group of a certain number of groups of outgoing circuits is entirely controlled by means of other pulses than digital pulses.



   9 - In or for an automatic or semi-automatic telephone system, a circuit arrangement comprising an automatic office and one or more groups of connected trunk lines

 <Desc / Clms Page number 19>

   canopy to manual desks, characterized in that any
 EMI19.1
 groups ri ""; connection ir.cui.s, reached through the digital stage of the office f '' .. norr;

  Rtiqlle, pst pdapté for e "re chosen via a series of divine accesses of the said stage, equal in number to the said groups of junction leagues, and that the chosen co'mexion circuit is in turn connected to a line de jonion in a group
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 eg particular of said groups of junction lines, in concordance with the access of said connection circuit.



   10 - In or for an automatic or semi-automatic telephone system, a circuit storage unit comprising an office
 EMI19.3
 E'utomF.! Tiqlle t a series of groups of junction lines leading to manual central offices, characterized in that connection circuits, or repeater circuits, reached through the starting digital selector step had automatic office, are associated er. common with a series of groups of trunk lines between offices.
 EMI19.4
 



  11 - VÙQ: S Or for the telephone system q .to8tique or ser: .i-2utO! :: 2tiqù.e, a? Ri? '2ïe'iient of circuits comprising a group of connection circuits, or repeater circuits , associated with a group of er: .refistreù.rs s nu.mériqus, characterized in that any 1'7Lin of said circuits ogt rdpped for eirp reached through a series of paths of the preceding selective step , and is suitable for extension to any one of a number of groups of trunk lines or connection circuits equal in number to the paths.



   12 - In a telephone system; a digital selector step starting at an automatic office; a group of connection circuits, or repeater circuits, starting from the automatic office and adapted to be reached through a series of pathways
 EMI19.5
 cès diffé-.ts from 1a said selective step; a group of pre-regulators associated with said connection circuits; a series of groups of trunk lines from the automatic office to a number of manual offices é [2.L '\:

   in number Pux known as paths

 <Desc / Clms Page number 20>

 
 EMI20.1
 access' a series of lines of order provided from the automatic office to the said m offices:; nuels a means by which a recorder, taken in use in establishing a connection, is mdppté to be automatically connected to an order line heading in a direction determined in accordance with the access path to
 EMI20.2
 the recorder;

   4 a means, by which a circuit, of starting connection, which is thus used in 1? connection, can be automatically connected to the start end of a particular trunk line which was taken in use at its end end by the operator reached by the order line.
 EMI20.3
 13 - Semi-automatic telephone system, comprising an automatic office and a series of groups of trunk lines extending:

  , to two or more manual offices, 'or to two or
 EMI20.4
 several positions differing m, jméi, iq, jemnnt at the same desk, characterized in that single movement switches are provided for said automatic desk, which are adapted to extend the
 EMI20.5
 connection to a junction iè of a requested group pp, r a simple search operation.



  14 - Semi-nutomptic telephone system, as claimed in 6, in which each repeater is provided with an associated 4or.muta.teur with access to a series of junction lines extending to two or more manual offices or to different positive at the same office.
 EMI20.6
 



  15 - A semi-automatic telephone system as claimed in 6 or 14, in which a free repeater having a free associated recorder mechanism is taken into use as a circuit. Derived from a previous switching step, one or more series of pulses to initiate said mechanism were transmitted through them. conductors extending from the branch path to the recording mechanism.
 EMI20.7
 



  16 - 'd circuits, as claimed in 2, 3 or characterized in that the number of the requested subscriber has been announced through an order line. e., an e P!: 't aut

 <Desc / Clms Page number 21>

 
 EMI21.1
 17 - Wax arrangement they, as claimed in 16,
 EMI21.2
 '.) 13xHctérized in that the' .on of b.reau d0 ":: r" die, or some other indicative terms, is nuto: 1.tiqu; in, = ,; L I'mo) .cé in plld3 au number of e 1 ';> bo nné q Í,'. d the call 1 place in 1Pllderr ..



  18 - A #. = Xng; 1. ,, P.;> Of 1: .c.iits, as claimed in 16, characterized 1'11 1> 'that the no of 1),.!. A? U calling ('8 "; <' romatically announced through the line '' 'order, in addition to the die:' i :: ation of 1 '
 EMI21.3
 subscriber requested.
 EMI21.4
 



  19 - Arxa :: r e1 .c; r.t of circuits, such as claimed in 5, characterized in that q .... ', \ nE; league of any order taken <% ,: uspge teeth the established, Jf'f> rr.el; t, of a call, is iada ptée for trf3Ydr'Jt be in brother a 8i [, "F \ l d occupation of the operator towards the recorder.
 EMI21.5
 



  20 - Arrange; '. En': of circuits, as claimed in 4 or
 EMI21.6
 19, characterized in that, in response; '11 says> ie: .i> 1, un; 3: \ [', 13.1 rudi
 EMI21.7
 busy tif is sent to the calling subscriber.
 EMI21.8
 



  21 - .Arra1. [! Cir ;; '; 1T, of circuits, as claimed in 4, 19 or 20, characterized in that q' .8, e'1 answer nu says iY7fl, the order line ". st- utomaticc: r: '. t released.



  22 - Arrpn2 (J! YJ) IÏt c1r r, irc; iits, tel c :( 'revriJiqué in 4, 19 / or 21, characterized in that, in response to said signal, the recorder is Rutoinatically. .



  23 - Arrangement of.: - iîcùi't :, as claimed on 5, characterized Pl., ..: - that calls arriving at the group of recorders are connected to 1; order line to the requested office at; iis 1e ($.
 EMI21.9
 order of arrival.
 EMI21.10
 



  24 - Arrangement of circuits, as claimed el-. 23, characterized in that a series of link circuits are provided to connect Ips recorders to the order line, these link circuits are provided. connected to F '.: L'ee: 1str0urs in' ..lJ. crdrp rotation under the control of a distributor switch, and the line
 EMI21.11
 order being connected to the link circuits in the same order of rotation.
 EMI21.12
 



  25 - Arrangement of ÈlcLlit.fl> as claimed in 5,

 <Desc / Clms Page number 22>

 characterized in that the automatic desk is of the type with control by derived path, and that the switch derived from the starting selector step is adapted to choose a free connection circuit with which is associated a free recorder.



   26 - Arrangement of circuits, as claimed in 5, characterized in that the recorder is of the translator type and is adapted to control the annunciator mechanism in such a way that the information made follows exactly the method of, called required, prevailing the manual method.



   27 - Arrangement of circuits. as claimed in 26, characterized in that if the first pair or the last pair of the four recorded digits are the same, the sending takes place so that the word "doublp" is announced instead of the first of the digits dela. pair.



   28 - Circuit arrangement, as claimed in any one of claims 1 to 6 and 14 to 27, comprising means by which a connection is extended to the originating end of a trunk line, in response. to a maneuver on the part of a manual office operator.



   29 - Arrangement. circuit, as claimed at 28, wherein a connection to the starting end of said trunk line is determined when the attendant establishes a connection between the incoming end of said trunk line and a line requested, or a connection circuit.



   30 - Circuit arrangement, as claimed in 12, characterized in that said connection circuit, or said repeater circuits, and said recorders are adapted to be connected to groups of trunk lines and to lines of orders by searcher switches.



   31 - Circuit arrangement, as claimed in 30, characterized in that the automatic office is of the type with control by derivative path, and that a starting or repeated connection circuit

 <Desc / Clms Page number 23>

 The recorder with its associated recorder is taken into use by the start bypass switch through which the remaining digits marked on the disc are received by the recorder.



   32 - Arrangement of circuits, as claimed in 12,
30 or 31, characterized in that when the remaining digits have been received by the recorder, it is. connected to one of the groups of link circuits (arranged to be used in turn by a distributor switch through which the required order line is marked and concordant with the access path to the recorder .



   33 - Circuit arrangement, as claimed in 32, characterized in that when the required order line becomes free, an individual switch searches for the next pending recorder.



   34 - Circuit arrangement, as claimed in 12 or
33, characterized in that the recorder is associated with a common call annunciator mechanism and in response to a signal through the remote operator's command line, the designation of the subscriber is announced. through this order line under the control of the recorder.



   35 - Circuit arrangement, as claimed in any one of claims 30 to 34, characterized in that the outgoing connection circuits of the repeaters are adapted to be connected to the trunk lines between offices by a finder switch in the banks of which the required group of junction lines is marked in concordance with the path.



   36 - Circuit arrangement, as claimed in e. 35, characterized in that the switch searches for a trunk line in the requested group which has been taken into use by the remote operator.



   37 - Circuit arrangement, as claimed in 35 or 36, characterized in that the switch searches for the required trunk line in two stages under the control of the recorder, the

 <Desc / Clms Page number 24>

 required group being found while the information is being transmitted, and the choice of trunk line taken in use being produced within a specified time after the information has been received.



     38 - Circuit arrangement, as claimed in 36 'or 37, characterized in that two test circuits are formed during the search for the marked junction line, one for the busy condition and the other. for the marked condition.



   39 - Circuit arrangement, as claimed in 38, characterized in that the switch quickly switches on. junction lines occupied without trying for the marked condition.



   40 - Circuit arrangement, as claimed in 9, characterized in that the trunk lines are direct calling, and a finder is adapted to search for a free trunk line in the required group.



   41 - Circuit arrangement, as claimed in 34, characterized in that if a call is to be extended to a manual office, the recorder is adapted to determine, in accordance with the path, whether any phonic current signals additional to the numerical designation of the subscriber and codes for a tsndem call, must or not be transmitted through the order line.



   42 - Circuit arrangement, as claimed in 31, characterized in that when the switch of the starting path finds the chosen connection circuit or the repeater circuit, a relay of the connection circuit is energized through the third conductor to connect the connection circuits and recorder.



   ABSTRACT.



   The invention relates to telephone systems for central offices, and it includes the novel facts described and shown herein.

 <Desc / Clms Page number 25>

 



   More particularly, the invention comprises: a) - Arrangements for establishment systems. calls by means of order lines between an automatic office and a manual or semi-automatic office. b) - Annunciator or call indicator arrangements for establishing connections between an automatic central office and an operator position of a manual central office c) - Means for transmitting a busy signal through an order line from an operator position in a manual office to the devices in an automatic office. d) - Improvements in the systems for c;

  common control for derived circuits. e) - Arrangements by which a number of paths are combined and then separated, so that devices associated with said paths can be used for calls established through any of the paths.