US1623714A - barnay - Google Patents

Description

A. BARNAY SYSTEM FOR TRANSMITTING ELECTRICAL IMPULSES April 5,1927; I 1,623,714

Filed June 4, 1925 3 Sheets-Sheet 2 April v5, 1927. I

1,623,714 A. BARNAY I SYSTEM FOR TRANSMITTING ELECTRICAL IMPULSE$ Fil ed June 4, 192's 3 Sheetsl Sheet s I R 555 may we e Apr. 5, 1927.

UNITED STATES PATENT. orl-lcs.

ANTOINE BARRAY, OI PARIS, FRANCE.

SYSTEM FOR TRANSMITTING ELECTRICAL IMPULSES.

Application filed June 4, 1825, Serial No. 84,892, and in France June 11, 1924.

The object of the present invention is a system for transmitting electrical impulses, which is suitable more particularly in automatic telephone systems, and generally in all step by step switching systems.

The invention concerns automatic switchin s stems in which the connection is establis e by means of electrical impulses sent over the two wires of the calling line in series.

I In systems of this kind, the impulsing circuit, including the calling station, is es-' tablished progressively until the last organ used for establishing the connection is operated. As a resultof this, in order to maintain all of the switches excepting the last intheir operated positions, a second holding circuit is required.

Means have been provided for eliminating.

this second circuit for inter-ofiice trunks in automatic telephone systems, by the addition in these trunks ofan lmpulse repeater which has the same function in respect to the sec ond ofiice, as the im ulse sending device of the calling station as to the originating ofiice. 7

One, of. the objects of the present invention is the'suppression of impulse repeaters.

With this end in view. the invention con- 0 sists of means em loyed for using one of the line wires for t e impulsing circuit, and the other for maintaining and controlling the impulsing circuit.

These means are characterized in that the 85 circuit of the calling station is closed in series with a relay whose function is to produce:

1st. Impulses in a circuit comprising one of the line conductors and in. each of the 40 serially related selector switches, a relay whose function is to control the operation of the associated selector.

2nd. The energization of a relay for establishing and maintaining the impulse circuit, 4 the circuit of the said relay comprising the other line conductor, and in each oifice by which the connection passes, a. similar relay; a this circuit remaining closed in each of the serially related selectors, until the final selector is directed to the called line, the deener-' gization of these relays connecting up the talking circuit.

This invention permits the battery )feed the line conductor chosen for the impulse shown in Fig. 2.

and supervisory, relays to be placed in the first selectors, and the incoming selectors (which are leastnin number) instead of in the final selectors (which are greatest in number) as is actually the general practice, this effecting an economy desirable even in single ofiice telephone system.

An application of the means of the present invention is particularly advantageous,

and is characterized in that, between two may be doubled and becomes .QX.

With this disposition, connections ma be established through a tandem ofiice, wit out the use, neither of additional digits in the calling number, nor of register-sender equipment. A tandem office disposed according to this invention will have associated with each incoming selector, which establishes the connections local to the tandem oflice, a preselecting secondary switch which is always standing on an idle trunk leading to the following ofiice, and a switching arrangement whose operating position is determined by circuit by the preceding selector, the switching arrangement connecting up either the selector local or the secondary switch to the incoming trunk.

The accompanying drawing represents, as an example only, three of the preferred forms of realization of the invention.

In Fig. 1 is shown the circuit drawing of one form of realizing the invention. The selectors circuits are not shown as they may be anv one of the well known step. by step selectors. 4

In Fig. 2 is shown a second form of realization of the impulse circuit.

Fig. 3 is a diagram relative to the circuit showingthe application the circuit of 5n referring to Fig. 1, when the calling station is connected to a selector S,, impulsesare sent by the impulse sender 1, of any of the well known types which produce interru tions in the line circuit. The line relay 2 lies two windings, one 3 be ng connected between the battery and the line conductor 4, the other 5 between earth and the other line conductor 6. The impulses sent over the line cause relay 2-to alternately attract and release its armature 7. Relay is shown as having two windings, but it might have only one winding and the impulses sent over one line conductor only.

When the calling station is connected to relay 2, this relay energizes in series w th the station, and closes at 8 the followin circuit: battery-978--10earth. elay 10, upon energizing, closes the circuit: battery-relay 12-11'-13-and earth. Relay 12 energizes, prepares at 14 a holding circuit, and at 15 the impulsing circuit for relay 16.

When the impulse sender 1 is operated, at each interruption of the line circuit rela .2 falls back, and closes at 17 the following circuit: battery-resistance 9contacts 7-- 1715--18'relay 16-and earth. Relay 16 controls the operation of the selector, which is of the step by step type, and

does not need to be described. The slow to release relay 10 does not fall back during the series of impulses.

After the transmission of the first digit of the called number, when the wipers 19 and 20 are brought to rest on an idle line, relay 21 energizes, connects at 22 relay 12 to the line conductor 23, connects at 24 the impulse circuit to the other line conductor 25, and o ens at 13 the original holding circuit of re ay 12. As contact 22 is established before 13 is opened, relay 12 remains ener ized over the circuit: 19- inc conductor 23-and earth, in the selector S which in the present example is re resented as incoming selector in another 0 ce.

In the selector S relay 26 energizes in series with relay 12 of selector S,, over the circuit: line. conductor 23--contact 55- wind ng of relay 26contact 27and earth. The impulse circuit is connected to relay 28 over the circuit: line conduct-or -contacts 30-,29-winding of relay 28and earth.

When the impulse sender is operated to send the second digit of the wanted number, at each interruption of the line circuit the circuit of relay 28 is closed by: batteryresistance 9-contacts 7--17--15-24 wiper 20line conductor 25contacts 30--29-winding' of 28-and earth. Relay 28 controls the operation of the selector 8,.

22--wiper As, explained for the selector S,, when the wipers of" S are brought to rest on an idle line, relay 31 energizes, connects at 32 the earthed line conductor 33 to relays26 and 12 in series, and opens at 27 their local holding circuit. At 34 the impulse circuit is connected to line conductor 35.

The following selector S is a hundreds selector in the same oilice as S and S, is a line or final selector. S and S, have each an impulsing relay indicated by 1628, since these relays have the same functions as rclays lti of S, and 28 of S and have besides a switching relay indicated by 2131,

since the function of these relays is the same as relay 21 of S, and 31 of S ll hen the wipers of S, are brought to rest on the contacts of the wanted line, relay 21-31 energizes, opens the holding circuit of relay 26 in S and relay 12 in S,. and in 37 and 38 connects up the wanted line, the impulse circuit being opened at 39.

In S,, relay 12 falls back and connects at 40 and 41 the battery feed relay 42 to the line. In S relay 26 on falling back, opens at 44 the circuit of the slow to release relay 43, which was energized when relay 26 energized. Relay 43 does not fall back immediately when its circuit is opened and the circuit of relay 45 is closed at 46 and 47; relay 45 energizes, and connects relay 49 to the line at contact 48. Relay 49 energizes in series with relay 42, but on account of the high resistance of the two windings relay 49, relay 42 is not energized. At 50, relay 49 closes a new circuit for relay 43 before this relay has had time to fall back. Relay 45 on energizing connects at 51 and 52 the battery feed relay 56 to the called side of the line; closes at 53 and 54 the talk ing circuit and opens at 30 and 55 the shunts around the condensers in series with the lines conductors.

The talking circuit is now completely established.

When the called party takes down his receiver, relay 56 energizes and short-circuits at 59 the high resistance winding of relay 49. In selector 5,, relay 42 energizes in series with the low resistance winding of relay 49, and in any well known manner operatesa subscribers meter and provides supervision on the callin line.

It is not necessary to escribe the release of the connection, which is controlled by relay 10 of S, and 43 of S the'sc relays falling back at the deenergization of 2 of S,

and 42 of S when the calling party hangs 2 ing used for the impulse cirehit being em-' vployed for making a. non-numerical selection, and for holding the selectors in operated position. i

In the exam le represented, S, is a selector similar to and S, a final selector.

The selector b, has two relays 16--28 and 21-31 the operation of which is the same as described above. It has besides a reversing relay which is, 01' is not energized according to the digit received by the selector S Rela 60 on euer izin reverses at 3 y b P:

' lector, such as S relay 12 is connected in series with the lower winding of relay 67 in S over the circuit: battery-relay l2-line conductor -wiper 64conductor 7 4contacts 6970--lower winding of relay 67 and earth. Relay 67 energizes, closes at 71 a holding circuit by its upperwinding, disconnects at 72 the lower winding of 68 from the 'line conductor, and connects at 73 the line conductor 75 to the impulse relay 16-28. Furthermore relay 67 prepares the connectin circuit for wipers 78 and 79, at contacts '76 and 77. From this point on relays 16*28 and 21--31 operate as described a eve.

2nd. The called digit is such as to cause the energization of relay 60. In this case, the relay 12 in the proceeding selector such as S is connected in series with the lower winding of relay 68 by the circuit: conductor 75-contact 61--wiper 63-conductor 75- and contacts 8072.

Relay 68 energizes, closes a holdingcircnit by its upper winding at 81, disconnects at 70 the lower winding of relay 67 from conductor 74, connects at 82 the impulse relay 1628 to conductor 74-and prepares at contacts 83 and 84 the connecting circuit for wipers 85 and 86.

,Fig. 3 is the diagram of a practical application of the circuit shown in Fig. 2 to a telephone oifice having a capacity for 4,000 lines. This oflice has only twoselecting stages; In the diagram, the first stage of selection is represented by the selector S and the second stage by the line selector Sf, each of these selectors having twenty trunks per level, although the numbering system is decimal.

The line selector S, has access to 200 subscribers lines, but it only receives two digits of the called number, the choice of the lines in one or the other hundred to which it has access being determined by the preceeding selector and which causes the operation or the non-operation of relay 60 (Fig. 2, S

of which two are entirel The first selector S, has accessto twenty oups of line selectors S]. It receives two igits of the called number, the first digit causing the wipers to be brought to rest on the group of lines corres ruling to the called di 't. This roup of es comprises five su groups. he second digit. brings the wipers into contact with the first line inthe determined subgroup, and causes the excitation if necessary-of relay 60 in such a way as to release in this group ten difl'erent combinations.

The selection of an idle line in the chosen sub-group takes in the well known way.

The above described arrangement of selector S, can be applied to any type of selector.

Fig. 4 represents an arrangement in which an incomin selector and an organ which designed in t e following by the name tandem selector are grouped together in. the same ofiice. This arrangement consists of three parts independent, one from the other, and a t ird which cooperates with one or the-other of the first two. separately.

The two independent parts are the selector S, which for example may be similar to the selector 8,, and the tandem switch CT.

The third part consists of the group of relays GR. The tandem switch CT is arranged so that its wipers are always at rest on an idle line.

The group represented by Fig. 4 is chosen by a selector such as S, and which maybe situated another ofiice); this grou can receive impulses either over the con actor 75, or over the conductor 74. p

1st. The impulses come in over the con. ductor 74. In this case, relay 87 ener izes in series with a relay, such as 12 (S, 1) by the circuit: earth-contacts 8889 winding of 87contacts 9091conductor 65-(relay 60 energized) and relay 72to battery.

Relay 87 energizes, and remains energized over the circuit contacts 92-9394earth. Relay 87 disconnects at 95 relay 96 from the conductor74; at 100, the circuit of relay 101 is closed, and this relay energizes.

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Relay 101 connects at contacts 102 and gized)relay 12 S 64conductor 65 (rela 60 not being enerig. 1)and battery.

Relay 97 is hel in operated position by contacts 1099394and earth; at contact 90, relay 87 is disconnected from conductor 75, and at contact 110, the impulse relay 16-28 is connected to conductor by 91-- 110-98-and 99.

Impulse relay 1628 of selector S, controls the operation of this switch as hereinbefore described. lVhen the wipers come to rest on an idle line, relay 2131 energizes and connects up the wipers 111 and 112 and the following selector, to the line conductor 74 and by the contacts 113114-, 9398,

and 91108.

Relay 96, being in series with conductor 74, remains energized by earth from the following selector. Relay 45 has the same functions as relay 45 in selector S and is energized when the connection is established with the called line.

Fig. 5 is a diagram of the application of the arrangement shown in Fig. 4, in a telephone network having a tandem oflice Bt.

At Ed is re resented an oifice having access to the o co Ba, through the tandem ofiice Bt. Each oflice is supposed to have a capacity for 10,000 lines, and that the subscribers numbers consists of 5 digits. The digit indicating ofiice Bt is the digit 5, that for oflice Ba is 6. When a subscriber in ofli'ce Bd calls the digit 5, the selector S takes an idle line to oflice Bt, but in this case relay 60 (5 Fig. 2) is not ener ized and the incoming selector S at ofiice t is used for establishing the connection with a subscriber in otfice Bt. The four following digits of the called'number operate the local selectors in oflice Bt.

If the first digit of the wanted number is 6, selector S takes an idle line to ofiice B5" placed by an arrangement similar to the one composed of selector S and tandem switch CT in office Bt, and which would be operated by an appropriate combination of dlgits in the calling number. It is quite clear that in this case the digit indicating one of the ofiices Ba would correspond to the indicating digit of office Bt, which in the case exposed above would be the digit 5.

One of the principal advantages of this arrangement is to have only one group of outgoing trunks between oflioe Ba and oflice Bt.

What I claim as my invention and desire to secure by Letters Patent is:

1. In an' automatic telephone 111, a callin line, an impulse sending evioe in the circuit of the said line, a line relay serially related selector switches connected by two conductor trunk lines, a magnet in each selector for controlling the setting of the said selector the circuit of the magnet including a section of one of the conductors of the trunk line, an interrupter actuated by the line relay, and means, including the second conductor of the trunk line, for connecting the said section of the first conductor either to the said-interrupter during the selection or to one of the conductors of the calling line at the end of the selection.

2. In an automatic telephone system as claimed in claim 1, means for connecting the second conductor of the trunk line to the second conductor of the calling line.

3. In an automatic telephone stem a calling line, an impulse sending evice in the circuit of the said line, a line relay, serially related selector switches connected b two conductor trunk lines, a magnet in eac selector for controlling the setting of the said selector, the circuit of the magnet including a section of one. of the conductors of the trunk line, an interrupter actuated by the line relay, a switching device for connecting the said section of the first conductor either to the said interrupter during the selection or to one of the conductors of the calling line at the end of the selection, and means including the second conductor of the trunk line for controlling the position of the said switching device.

4. In a multi-ofiice automatic telephone system, a calling line, an impulse sending device in series with the said line, a line relay, serially related selector switches located in the several otlices of the network and connected by two conductor trunk lines, a magnet in each selector for controllin the setting of the said selector, thecircuit of the magnet including a section of one of the trunk line conductors, an interrupter actuatecl by the line relay, a first switching device in the originating oflice for connecting the said section of the first conduct/or either to the said interrupter during the selection or to one of the conductors of the calling line at the end of the selection, means in each of the other otfices for holding the serially related selectors in operated position the said means being controlled by a switching device and means including the second conductor of the trunk line for controlling the position of the latter switching devices and that of the first switching device located in the originatin oflice.

5. In an automatic telep one system, a

calling line, an im ulse device in series with the said ine, a line relay, serially related selector switches connected by two conductor trunk lines, a magnet in each se- {oi-s, an interrupter actuated by the line re a at a switching device for connecting the section of the first conductor either to the said interrupter during the selection or to one of the conductors of the calling line at the end of the selection, a holding relay in the circuit of the second conductor of the trunk line for operating the said switching device, means for ener zing the said relay before the selection ang means for opening the circuit of the said relay at the end 0 Q the selection.

circuit of the holding relay, means for closing the said interru ter at the first energization of the line re ay and means for holding the said interru ter closed until the last de-energization of t e line relay. v

8. In an automatic telephone system as claimed inclaim 5, an interrupter in the cir cuit of the holding relay, means for closing thesaid interrupterat the first energization of the line relay and for holding it closed until the last de-energization of the said line relay, a switchin device in each elector for prolonging the circuit ofthe holding relay to the following seriall' related selector and an interrupter dispose in the final selector for opening the circuit of the holding relay at the end of the selection. 9. In an automatic telephone s stem, a calling line, an im ulse sending evice in series with the sai line, a line relay, serially related selector switches connected b two conductor trunk lines, a magnet in eac selector for controlling the setting of the said selector, the circuit of the magnet including a section of one of the trunk line conductors, an interrupter actuated by the line relay, a switching device for connecting the said section of the first conductor either to the said interrupter during the selection or energization of the line relay and for. maintainin it closed until the last de-energization 0 the said line relay, means for opening the other interrupter after the energizato the said interrupter during the selection tion of the holding relay, a locking circuit for the said holding relay including an interrupter closed on the energization of this relay, a switching device in each selector for prolonging the circuit of the holding relay to the following serially related fse-' lector and an interrupter disposed in the final selector for opemng the circuit of the holding relay at the end of the selection.

10. In an automatic telephone system as claimed in claim 9 an interrupter in the second conductor of the trunk line and controlled by the holding relay for connecting this second trunk conductor to the corresponding conductor of the callin line on the de-energization of the said re ay.

11. In a multi-oifice. automatic telephone system, a callingline, an. impulse sending device in series with the said line, a line relay, seriallyrelated selector switches located in the several ofiices of the network and connected by two conductor trunk lines, a magnet in each selector for controlling the setting of the said selector the circuit of the magnet including a section of one of the trunk line conductors, an interrupter actuated by the line relay, a first switching device in the originating oflice for connecting the said section of the fiIStQOlldlICtOlfilthQI" or to oneof the conductors of the calling line at the end of the selection, means in each of the other oflices for holdin the serially related selectors in 0 ate position the said means being contro ed by a switch-- ing device, a first holding relay in 'the originating ofiice for controlling the position of the first switching device, another holding relay in each other oflice for controlling the position of the switching device in. its respective oflice the circuit of ,the holding relaysincluding the second trunk conductor, means for energizing the first holding relay before the selection, means for energizing each of the other holding ren0 .lay before the o eration of the selectors in the ofiice to which the considered relay is located and means for opening the circuit of the said relays at the end of the selection.

12. In an automatic telephone system as claimed in claim 11 means for disconnecting the holding relays from the trunk line at the end of the selection.

' 13. In a multi-oflice automatic telephone 12c system, a calling-line, an impulse sending device in series with the said line a line relay, serially related selector switches lo cated in the several oflices of the network and connected by two conductor trunk lines, 12 a magnet in each select'or for controlling the setting of the said selector the circuit of the magnet including a section of one of the trunk line conductors, an interrupter actuated by the line relay, a first switching de- "9

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