US1480614A - Telephone repeater - Google Patents

Description

Jan. 15 1924.

O. B. JACOBS TELEPHONE REPEATIQJR Filed Oct. 18, 1919 ATTORNEY Patented Jan. 15, 1924.

'.UNITED STATES PATENT OFFICE.

OLIVER B. JACOBS, OI MO RBIS PLAINS, NEW JERSEY, ASSTGNOR '10 AMERICAN TELE- P HONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.

TELEPHONE REPEATEE.

Application filed October 18, 1919. Serial No. 881,878.

a To all whom it may concern:

Repeaters, of which the following is a spec1-- fication. v

My invention relates to repeaters, particularly to repeaters of the cord circuit type.

It is an objectof the invention to provide for each telephone line entering a repeater station, a separate balancing network and repeater transformer designed to correspond to the impedance of the line and to place the amplifying elements of the repeaters into the cord circuits, so that any one of the repeater cords may be used, to establish connection between'any desired pair of lines. To permit of the making of non-repeater connections, I provide for each line a relay which is arranged to disconnect the repeater transformer and the net work from the line,

except when a repeater cord is associated with the line.

One form and arrangement of apparatus and circuits embodying the invention is shown in diagrammatic view in the accompanying drawing in which reference character L designates a telephone transmission line, which is normally associated with switchboard conductors 1 and 2 by means of the back contacts 6 of a relay-3, a transformer 20 being provided to associate conductors 1 and 2 with the tip and ring contacts of a jack 4. A line is associated with a jack 4' by apparatus designated by similar characters of reference, the prime mark bein used to distinguish the aparatus of line L' from that of line L. Both ines L and L are thus normally associated with the jacks 4 and 4' and an ordinary nonrepeater connection may be established between the two lines by connecting the two jacks by an ordinary cord circuit.

For the purpose of connecting the two lines through a repeater there is rovided adjacent jack 4 of line L a jack 5, t e sleeve of which is connected to the circuit of relay 3 so that this relay is energized when ground is connected to the sleeve, as described here- 7 inafter. The winding of one side of a repeater transformer 10 is connected to the tip and ring contacts of jack 5 and-the windings of the other side of this transformer are connected by means of conductor 8 and 9 to the front contacts 6 of relay 3, the other terminals of these windings being connected to a network N, which has the same characteristic impedance as the line L. The midpoints 16 and 17 of the transformer windings are associated with contacts 12 of relay 3 these contacts being arranged toconnect' the said midpoints with the switchboard conductors 1 and 2 when relay 3 is energized. For associating jacks 4 and 5 with the corresponding jacks in line L there are provided repeater cord circuits 21, comprising amplifying devices 14 and 15, and terminated by twin plugs 4, 5; and 4 5 en the operator desires to establish a repeater connection between lines L and L',

she merely associates the plugs of the repeater cord with the corres onding jacks.

As plug 5 is thus introduce into 1ts jack,

the sleeve of the jack is connected to ground so that relay 3 becomes energized andconnects network N to the line, in place of jack 4. The points 16 and 17 in the windings of transformer 10 are now points of symmetry between the line and the network the imedance of the line circuit to the left thereof ein substantially equal "to the impedance of t e network circuit to their right. The front contacts 12 of relay 3 connect the jack 4 with points 16 and 17, so that when current flows in line L a portion of the current is shunted from the line by means of conductors 1 and 2, which current flows through transformer 20 over the ti and ring contac s of jack 4 into the amp ifying device 14 in the cord circuit, by means of which device 20', jack 4', amplifier 15, jack 5 and trans- V former 10 into line L and network N.

For the purpose of sen'dinlg1 Morse and other signaling currents over t e conductors of the telephone lines, there is associated with each switchboard conductor a c p sof cord circuit 21 with the v ite set 22 of the type well known in the art. Under ordinary circumstances the Morse currents flow over the back contacts 6 of relay 3 into the line conductors. When repeater connections are established over the lines the Morse currents flow through the front contacts 12 of relay 3 to the points of symmetry 16 or 17, from which points half of the current flows into the network and half through front contacts 6 of relay 3 into the line. The Morse apparatus is thus associated with the line at the point of symmetry between the line and its balancing network so that it causes no disturbance in the balance between the line and the network. The contacts 12 of relay 3 are arranged to close before back contacts 6 open so that there is no interruption of the continuity of the line. relative to the Morse current. Other signaling apparatus may be associated with the line in similar manner. The networks N are preferably grounded at their midpoints so that the telegraphic current in one line circuit is unable to cause disturbances in the adjacent line circuit.

Although I have shown and described herein only one form and arrangement of apparatus embodying the invention, it is readily understood that various modifications and changes may be made therein within the scope of the following claims without departing from the spirit and scope of the invention.

What I claim'is:

1. In combination, atele hone line, a jack normally terminating sai line, an amplifying repeater comprisin a three-winding transformer, and means or at times interposing said transformer between said line and said jack.

2. In combination, a line, a jack normally terminating said line, an amplifying repeater comprising a three-winding transformer, a relay, and means for at times actuating said relay to inter ose said transformer between said line and said jack.

3. In combination, a line, a jack normall terminatingsaid line, a network for be ancing said line, a relay for at times disconnecting said jack from said line and connecting thereto said network in balancing relationship, and means operated by said relay for associating the points of symmetry between said line and said network with said jack.

4. Incombination, a line, a jack, a relay associating said jack with said line, a network for balancing said line, a repeater element, means actuated by said relay for at times disconnecting sai jack from said line and connecting thereto said repeater element and said network, and means actuated by said relay for connecting the midpoints of said element with said jack.

5. In combination, a pair. of telephone actuated when said cord circuits are associated with said jacks for interposing one of the elements of each repeater between the line and one of its jacks.

6. In combination, a pair of telephone lines adapted to be connected for through service, a jack. for terminatin each line, a repeater element for each line, a relay for each line for inter-posing said element between said line and its 180k, a second jack for each line, a second repeater element associated with each of said second jacks, a iair of cord circuits for associating the gacks of said lines and means for actuating said relays when said circuits are associated with said jacks.

7. In combination, a pair of telephone lines, a first jack for each line, a relay for each line for connecting the line with its jack, a network for each line for balancing the same, a second jack for each line, a pair of cord circuits for associating the jacks of one line with those of the other line, a repeater comprising amplifying devices, one in each of said cord circuits, and a pair of "input and output elements, means forassociating one of said elements with each of said second acks, means operated by sa1d relay for inter-posing the other of said elements.

between said line and its first-mentioned jack and a circuit for said relay actuated when said cord circuits are associated with the said jacks.

8. In combination, a line, a source of signaling current associated with said line, a switch to control said source, a network for balancing said line, means for at times connecting said source and switch directly with said line and disconnecting said network and alternativemeans at'other times for associating said network with said line and connecting said source to a point of symmetry between the line and the network.

9. In combination, a plurality of telephone lines, jacks therefor, respective networks and repeater transformers associating said lines with said jacks, and cord circuits'comprising amplifying devices for associating said jacks.

10. In combination, two telephone lines normally adapted for direct connection, a two-way two-element repeater, and means to connect said lines directly, or alternatively, through said repeater.

11. In combination, two telephone lines normally adapted for direct connection, respective balancing networks and three-winding transformers, two repeater elements, and means to connect said lines directly, or al ternatively, to their networks through the transformer windings and to connect the repeaters to the transformers.

12. In combination, two telephone lines normally adapted for direct connection or indirect connection, a two-way two-element repeater to becomprised in the indirect connection, means to connect said lines indirectly through said repeater, a telegraph signal branch connected directly to one side of one of said lines in their normal state, and means to connect it to a neutral point when the lines are connected through the repeater.

13. In combination, two telephone lines normally ending in respective jacks at the same station, telegraph signal branches con nected to each side of each line, a repeater through which the lines may be connected,

and means to change the telegraph signal branch connections to neutral points when the lines are connected through the repeater.

14. In combination, two telephone lines normally ending in respective jacks at the same station, a two-way repeater set comprising two three-winding transformers, supplemental jacks each permanently connected to a winding of the respective transformers, and twin plugs to connect the repeatcr between the lines.

15. In combination, two telephone lines normally ending in respective jacks at the same station, a two-way repeater set comprising two three-winding transformers, supplemental jacks each connected to a winding of the respective transformers, twin plugs to connect the repeater between the lines, and relays controlled by the sleeves of the auxiliary jacks to connect. the transformers in operative relation when the twin plugs are inserted in the jacks.

16. In combination, a plurality of telephone lines, respective artificial lines and three-winding transformers associated with said telephone lines, two opposite-way amplifying elements, and means to connect said elements for two-way two-element repeating between two of the said lines.

17. In combination, a plurality of telephone lines, respective artificial lines and three vinding transformers associated with said telephone lines, two opposite-way am plifying elements, means to connect said elements for two-way, two-element repeating between two of the said lines, and alternative means to connect two lines directly without amplifying repeating between them.

In testimony whereof, I have signed my name to this specification this 17th day of October, 1919.

OLIVER B. JACOBS.

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