US933335A - Telephone supervisory system. - Google Patents

Description

W. S. PAGA.

' TELEPHONE SUPERVISORY SYSTEM.

'APPLIO ATION TILED H0113, 1908.

933,335, v- Patented sepn. y, 1909.

' lhllllla 7 and secondary winding 8.

signal circuit includes secondary winding 8,-

calling and station B as about to be called. able to omit the audible relation between the The cord pair at G is of a type having four relays per cord air. The cords are separated conductive y by condensers 1 and 2.

5 On the answeringcord supervisory relays 3 and 4 are energized by current flowing through the substation bridge and through the cut-off relay 5; relay 3 closes the circuit of lamp 6 and relay 4 opens the circuit of 1c lamp 6. Upon cessation of current through the substation bridge at A, relay 4 will release its armature and close the circuit of lam 6. In series with lam 6 I introduce the induction coil having primar windings n audible conductors 9 and operators receiving telephone 10.

.It is obvious that when the circuit of lamp 2o 6, containing also battery X and induction coil winding 7,'is either closed or opened by relay 3 or 4, the starting or stopping of current in winding 7 will cause'an inductive pulsation in secondary winding 8; the relation of the windings 7 and 8, the conductors 9, and the receiving telephone 10 shall be such that the resultant current through the receiver 10 shall produce an audible but not objectionably loud click. It is obvious therefore that the working of the switchhook up and down at substation A' and thus breaking and making repeatedly the contact of the hook switch will,:by controlling relay 4' thus controlling the circuit of lamp 6 and primary winding 7, produce a series of clicks in the o rators t ephone 1O charactei'istically' ,di erent from the isolated and intermittent clicks caused by the regular acts of subscribers in answering calls and in 40 hanging .up receivers permanently for disconnection. Induction coil having winding 7 8{ 1s related'to the other. plug of the cord pair in the same manner, and transmits to I the telephone 10 audible signals from the station'B. As m'a-ny as desired of the operators lugs may be connected by an inductive llnk to the operators receiving telephone. The diagram of the figure accompanying contemplates that all of her plugs and supervisory lamps shall be so connected;

the secondaries 8 8 etc. of the induction coils may rouped in an desiredmanner, series, multlp e, or multip e are, in association with the conductors 9 which lead to the telephone 10.

In large exchanges, particularly in exchanges where trunking is used'extensively and in exchanges wheremeasured rates are .used, it is customary to have an operator igmore a signal for attention from her ringing plug, the action of an operator upon such a signal being merely to disconnect the plugs, thus permitting the signalingsubscriber to call in upon his proper A-operator. Under such operating rules it may be deemed advisringing plug and the' operators receiving telephone; this will reduce the total number of clicks to be received by the operator, yet leave her easily attracted to the flashing of a lamp by one of her own subscribers connected upon any answering plug. I call at tention to the fact, however, that the operators attention should be attracted for prompt disconnection of her ringing plug so that the subscriber signaling her may be enabled to signal his own operator more promptly.

The induction coils used may be of any desired characteristics, depending upon the strength preferred for the click in the operators receiver and depending upon the mode of connecting the secondaries before attaching to the circuit wires 9. I have found that with connections shown in the figure resistance for the winding 7 of .25 to .5 ohms and for thewinding 8 of 200 ohms give very satisfactory results. Itis found by experience also that the circuit is useful in warning an operator of the fact that some other operator may have plugged in and rung on a line that vthe first operator may have'had connected, as the act of the second operator plugging in and ringing on a busy line will cause the cord relay of the first connected cordto be chattered or rattled, and will thereby cause an interrupted current to flow through the primary of one of the induction coils, thus giving a' very decided signal in the operators receiving telephone who may have had the original connection.

The desideratum in the system of my invention is that a signaling link be provided at -all times between the supervisory circuits associated with the operators keyboard equi ment and the operators telephone. It is o .vious that many forms of combinin the ele ments to produce the result are possible, and also that divers elements may be combined to the same result. Combinations of condensers or impedances or both may replace the induction coils whose windings are 7 and 8. Also the windin 7, instead of being individual to a single amp, may be common to both lamps of a pair or may be common to all the lamps of the operators equipment, there being but a single such windin per operator and that winding being inclu in v the lamp signal bus wire of her position.

In this case, a click in the receiver will be heard for each change in current value, the

current increasing or decreasing slightly as any lamp is lighted or extinguished; the characteristics and limitations of existing supervisory circuits in an exchange where it is desired to install my invention to supplement an existing supervisory system, may in some instances be such as to render this method the most desirable.

In the system of my invention, the subscribers hook is enabled to operate as a telegraph key to produce. audible telegraphic signals in the operators tele hone receiver. This interpretation of the gure describes the relayet as the telegraph line-relay, the 5 receiver 10 in conjunction with the repeat- 1 ing coil 78 forming an audible telegraphic tors receiving telephone; and an induction coil having its primary winding included in said cn-cuit and its secondary winding connected to said telephone, substantially as described.

2.111 a telephone system, a subscribers line; a relay controlled over said line; a local circuit controlled by said relay; an operators receiving telephone; andan inductive link connecting said circuit and said telephone, substantially-as described.

3. In a telephone system, a subscribers line; a relay controlled at all times over said line; a local circuit controlled by said relay; an operators receiving telephone; and means for producing at any time an audiblesignal in said telephone when said relay is operated, substantially as described.

. 4. In a telephone systemfa;circuitadapted' to be opened and closed and adapted to be so controlled by a subscribers hookswitch;

' an operate'rs receiving telephone; and means operative at all times for producing a current. through said telgphone when saidcircuit is opened or clos soriloed. r I

5. In a telephone system, a circuit adapted to beopened and closed and; adapted to be so controlled by a subscribers hookswitch; an operators receiving telephone; andmeans operative at all times for producing a clicking sound in said'telephone when said cirsubstantially as'decuit is so controlled, substantially as described. I 6. In a telephone system, a visual superan operators receiving telephone; and an induction coil having its prlmary Winding included in said circuit and its secondary winding connected to saidtelephone, substantially as described.

8. In a telephone'system, a visual su ervisory signal; a controlling circuit there or; an operators receiving'telephone; and means .for producing an audible signal-in said telephone at all times upon energization or deenergization of said signal, substantially as described.

- 9. In a telephone system, a visual 'su ervisory signal; a controlling circuit there or; an operators receiving telephone; and means operative at all times for producing an audlble signal in said telephone upon the. breaking of said circuit, substantially as described.

10. In a telephone system, a telegraph circuit extending from an operators connecting apparatus to a substation, said circuit being operative at all times during the connection otthe o' erators conectin'g appara-, tus with the sai station, and producing an audible signal in the operators telephone in response to current changes in the said circuit, substantiall as described.

' 1 1. In a tele one system, a supervisory relay; a visua signal controlled thereby; and an auxiliary su ervisory signal circuit controlled exclusive y by said relay at all times duringthe continuance of connection I and including the operators receiver as an audible signal device;

Signed by me at Oil City, county of Venango and State of Pennsylvania, in the presence of two witnesses.

WILLIAM s. PAC'A.

Witnesses:

J S. MASON, T. P. CADIGAN.

Images