US1263083A - Telephone-exchange system. - Google Patents

Description

A;E.'L'UNDELL. .TELEPHONEE'XCHANGE SYSTEM.

APPLICATION FILED 16.16. l9l6- Q I Patented Apr. 16, 1918.

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Patented Apr. 16,1918. in w UNITED STATES PATENT OFFICE.

ALBEN E. LUNDELL, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF YORK, N. Y., A CORPORATION" OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application filed August 16, 1916. Serial No. 115,209.

New York, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description.

' This invention relates to telephone exchange systems.

The object of this invention is to provide means whereby a line in trouble may be cared for.

A feature of this invention is a circuit arrangement by which calls to a line in trouble are diverted to a special operator, and by which a wire chief or an attendant is signaled, if through any means such trouble is removed.

A further feature of the invention is a circuit arrangement whereby a connecting operators calling supervisory relay is not operated until the special operator plugs into the jack in which the line in trouble temporarily terminates, regardless of whether or not the, terminals of such line are arranged for party line ringing.

The invention has been shown applied to a semi-automatic telephone exchange system, but is obviously capable of use with telephone systems .of any type.

It is thought that the invention will be best understood from the following detailed description, reference being had to the accompanying drawings.

In the drawings, Figure 1 shows the substation apparatus of a calling and a called subscriber with portions of a connecting operators cord circuit, and diagrammatically indicates portions of an automatic switch for establishing a connection to the called subscriber. Special connections at the distributing frame are indicated, suchconnections to be set up when the line of the called subscriber is in trouble. Fig. 2 shows a circuit arrangement for extending a line to an -information operator and to a wire chief.

Let us now assume that the subscriber whose substation apparatus is indicated at 1 deslres to communicate with a subscriber whose substation apparatus is indicated at 2, and that the line running to substation 2 is in trouble. The subscriber at 1 removes his receiver from the hook, whereupon a line slgnal 3 is displayed in the well-known man-.

ner. A connecting operator inserts a plug 4 into a ack 5 of the calling line, energizing answering supervisory relay 6 over the substation circuit from the battery of the usual repeating coil 7. The insertion of the plug 4 into the jack 5 energizes the cut-off relay 8 and the operation of the supervisory relay 6 prevents the lighting of the supervisory lamp 9 in the well-known manner. The operator then ascertains the number of the wanted line and operates an automatic switch, the brush set of which is indicated at 10, 11 and 12. The automatic switch is controlled by circuits set up by a sequence switch (not shown), and after the brush set is positioned on the terminals 13, I4 and 15 of the wantedline and such sequence switch arrives in position 16, ringing current is sent out over the line. The automatic selector switch and controlling sequence switch therefor are preferably of the type whose operation is described in Patent No. 1,168,319.

When the line running to substation 2 was reported out of order, special connections were set up to jacks 16 and 17 over conductors 18, 19, 20 and 21 for a purpose to be described. Conductors 18 and 20 terminate in a plug 22, and conductors 19 and 21 terminate in a plug 23, which plugs are then permanently inserted in jacks 16 and of relay 25, armature and back contact of ing generator 60, winding of relay 27, lower armature and front contact of relay 25, brush- 11, terminal 14, conductor 18, tip of plug 22, tip contact of jack 16, conductors '29 and 30, left-hand high resistance winding of relay 31 condenser 32, conductor 33, tip contact of jack 17, tip of plug 23, conductor 19, terminal 13, brush 10', upper armature and front contact of relay 25, to ground. Suflicient current flows to o erate a drop 34 controlled by relay 31, but slnce the left-hand winding of relay 31 is of high resistance, the trip relay 27 doesnot operate. The operation of drop 34 closes a circuit from ground, drop 34 and its contact 35, windings of relays 36 and 37, to groundedbattery; Relays 36 and 37 are energized, the operation of relay 37 causing thedisplay of a line signal 38 in the well-known manner. The operation of relay 36 will cause the trip relay 27 to-energize over a circuit from ground, ringing generator 60, winding of relay 27, lower armature and front contact of relay 25, brush 11, terminal 14, conductor 18, tip of plug 22, tip contact of jack 16, conductors 29, 39, a resistance 40,-lower armature and front contact of relay 36, to grounded battery. Relay 27 attracts its armature, thereby removing the shunt about relay 26, which then energizes in series with relay 25. When relay 26 attracts its armature, it shunts out the winding of relay 25, which deenergizes and cuts ofi the ringing current and connects the talking strands of the conductors. At the same time the sequence switch is moved from position 16 to position 18, which is the talking position. This movement of the sequence switch is controlled by circuits not shown. I

The connecting operators callin supervisory signal 41 is not energized at t is time, since its circuit is from grounded negative pole of battery, lower right winding of repeating coil 7, winding of relay 41, lower armature and back contact of relay 25, brush 11, terminal 14, conductor 18, tip of plug 22, tip contact of jack 16, conductors 29, 39, resistance 40, lower armature and front contact of relay 36, to negative pole of grounded battery.

It might be well to note at this time that if the station called is on a party line, the arrangement might be such that ringing current would come in over. conductor 19, tip of plug 23, tip of jack 1.7, conductor 33, resistance 42, upper armature and front contact of relay 36, to grounded battery as before.

This circuit would allow trip relay 27 to operate, but would prevent the energization mal condition.

of supervisory relay 41 as before, since the circuit of relay 41 would then again terminate on both sides in like pole of battery.

When the special operator at O is signaled by the operation of lamp 38, she inserts a plug 43 into jack. 44 associated with lamp 38. A circuit is then closed for a relay 45 from ground, upper left-hand winding of repeating coil 46, tip of plug 43, tip contact of jack 44, conductors 47, 48, winding of relay 45, conductors 49, 50, ring contact of jack 44, ring contact of plug 43, supervisory relay 51, lower left-hand wlnding of repeating coil '46, to grounded battery; At the same time a circuit is closed from grounded battery, right-hand winding of rela 31, conductor 52, sleeve contact of jac sleeve of plug 43, resistance 53, to ground.

-Relay 3lattracts drop 34 and restores this device and its associated signal 38 to its nor- The energization of relay 45 closes an energizing circuit for calling supervisory Y relay 41 from grounded battery, lower right- 'hand winding of repeating coil 7, winding of relay 41, lower armature and back contact of relay 25, brush 11, terminal 14,.conductor 18, tip of plug 22, tip contact of jack 16, conductors 29, 54, impedance coil '55, armature and front contact of relay 45, conductors 56 and 33, tip contact of jack. 17

tip of plug 23, conductor 19, terminal 13,

brush 10, upper armature and back contact I of relay 25, upper right-hand winding of repeating coil 7, to ground. Supervisory relay 41 remains energized until the operator at O removes plug 43 from jack 44. The coil indicated at 55 is of comparatively low resistance'but is of high impedance, so that it may remain bridged across the talking circuit without interfering with the conversation. I

The operator at 0 may now inform the calling subscriber that the desired line is out of order.

When plug 22 was inserted in jack 16, a circuit was closed for lamps 57 and 58, the lamp '57 informing the operator at O that a line in trouble has been connected to acks 16v and 17 and that she may expect calls over this line. The lamp 58 informs a wire chief, a portion of whose cord circuit is shown at O, that a line in trouble has been connected to his position. A jack 59 is connected with a relay 62 from grounded battery,- winding of relay 62, sleeve contact of jack 59, sleeve of plug 61, resistance 63, to ground.

In order that the arrangement now to be described may operate successfully, it is to be assumed that the trouble on the line running to the subscriber at substation 2 consists of either a short circuit across the con- 7 64 and 65. The removal of plug 61 from jack 59 results in the deenergiza'tion of relay 62, whereupon a circuit is completed for relay 66 from grounded battery, winding of relay 66, spring contact 67 of relay 62, conductors 68 and 69, sleeve contact of jack 16, sleeve of plug 22, conductor 20, to ground at the point of trouble, if such trouble is a ground. If the trouble is in the nature of a short circuit, the circuit just traced will be extended across such short-circuiting path to the other line conductor, conductor 21, sleeve of plug 23, sleeve contact of jack 17, conductor 70, and armature and back contact of relay 62, to ground. When the trouble is removed from the line, relay 66 will be deenergized, whereupon a circuit is closed for relay 71 and lamp 72 from grounded battery, winding of relay 71, lamp 72, armature and back contact of relay 66, key 65 in its depressed position, to ground. The lighting of lamp 72 informs the wire chief that the trouble has been removed and the energization of relay 71 completes a circuit from ground through a generator 73, condenser 74, bell 75, key 64 in its depressed position,

and armature and front contact of relay 71, to ground. ,The bell 75 is thus caused to ring and may signal the wire chief at O or call his attention to the lighting of the lamp 7 2.

The conductors 18, 19, and 21 are usually connected at the point where the line in trouble enters the distributing frame. When the wire chief receives a signal indicating that the trouble has been removed, he causes the normal connections of the line to be reestablished at the distributing frame, and connections may be made thereto in the usual manner.

Instead of using a single switch as described in this embodiment of the invention, the connection might equally well be established over a train of automatic switches, the dotted lines at 7 6 and 77 indicating the possible presence of such switches.

What is claimed is:

1. In a telephone exchange system, calling and called lines, means for establishing special connections when a line is in trouble, an information operators position, a wire chiefs position, a signal at said wire chiefs position, means for diverting a calling line to said information operators position if the called line is in trouble, and means for operating said signal should the trouble be removed.

2. Ina telephone exchange system, calling and called lines, meansfor establishing special connections when a line is in trouble, such connections terminating in plugs, jacks arranged to receive said plugs, a pair of conductors running from said jacks to an information operators position, a second pair of conductors running from said jacks to a wire chiefs position, a signal at said wire chiefs position, means at said information operators position to allow said information operator to inform the calling subscriber that the desired line is in trouble, and means for operating said signal should thetrouble' be removed.

3. In a telephone exchange system, calling and called lines, means including aconnecting operators position for establishing connections between said lines, a connecting cord circuit thereat including a callin su- {pervisory relay and means for app ying ringing current to the called line, means for establishing special connections when a line is in trouble, an information operators position, a wire chiefs position, a signal at said wire chiefs position, means for diverting the calling line to said information operators position if the line called is in trouble, means for operating said signal when the trouble is removed, means for positively tripping said ringing current when applied to a line in trouble, and means for preventing the energization of said connecting operators calling supervisory relay until said information operator plugs into the connection. I

4. In a telephone exchange system, calling and called lines, means for establishing special connections when a line is in trouble, such connections terminating in plugs, jacks arranged to receive said plugs, a pair of conductors running from said jacks to an information operators position, a second pair of conductors running from said jacks to a wire chiefs position, a signal at said wire chiefs position, means at said information operators position to allow said information operator to inform the calling subscriber that the desired line is in trouble, and means including a relay and a locking key for operating said signal, said relay being arranged to deenergiz'e when the trouble is removed and establish a circuit through said key for operating the signaling device.

5. In a telephone exchange system, calling and called lines, means including a con- 7 necting operators position for establishing connections between said lines, a connecting cord circuit thereat including a calling supervisory relay and means for applying ingmg current to the called; line, means for estabmes es lishing special connections when the line is in fective for both individual and party line trouble, an information operators position, ringing for preventing theoperatlon of said 10 means for diverting a calling line to said supervisory relay until the information; operators position if the line called is in operator ha established connection to the trouble, means to connect said information calling line. operator to said calling line, means for posi- In witness whereof, I hereunto subscribe tively tripping said ringing current when my name this 15th day of August A. D. 1916. 15 applied to a line in trouble, and means efv ALBEN E. LUNDELL.

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