US1361929A - Monitoring-circuit for telephone-repeaters - Google Patents

Description

J. F. 100mm. MONITORING CIRCUIT FOR TELEPHONE BEPEATERS.

APPLICATION FILED MAY 18, 1917.

1,361,929, Patented Dec. 14, 1920.

3 SHEETSSHEET I.

INVENTOR ATTORNEY J. F. TOOMEY.

MONITORINC CIRCUIT FOR TELEPHONE REPEATERS.

APPLICATION FILED MAY 18, I9l7.

1,361,929, Patented Dec. 14,1920.

3 SHEETSSHEET 2.

*1 saw-10 m LzneEast Lane "@829 J INVENTOR J17 fbamzy vmmvflm ATTORNEY J. F. TOOMEY.

MONITORING CIRCUIT FOR TELEPHONE REPEATERS.

APPLICATION FILED MAY 18, 1917.

1,361,929, Patented Dec. 14, 1920.

3 SHEETS-SHEET 3- INVENTOR Tag ATTORNEY UNITED STATES PATENT OFFICE.

MONITORING-CIRCUIT roe Application filed May 18, 1917.

To all whom it may concern:

Be it known that I, JOHN F. TOOMEY, residing at New York, in the county of New York, and State of New York, have invented certain Improvements in Monitoring-Circuits for Telephone -Repeaters, of which the following is a specification.

This invention relates to telephone repeater stations and more particularl to the provision of monitoring equipment ior telephone repeaters whereby the operation of a repeater interconnecting two lines may be observed.

One of the objects of the invention is the provision of means, whereby an operator at one type of monitoring station such as, for instance, an observation station remote from the repeater apparatus, may observe by means of a suitable listening set the operation of a repeater during telephonic transmission from one line to another through the repeater. I

Another object of the invention is the provision of means whereby an operator at another type of monitoring station prefer-- ably located near the repeater apparatus, so that access may be had thereto for purposes of adjustment, etc, may connect a monitoring equipment to the repeater and by means of a listening set observe the operation of the repeater during transmission in either or both directions over lines interconnected through the repeater. Means are also pro vided whereby the operator at a monitoring station of the second type may disconnect the repeater from the transmission circuit and directly connect the lines so as to permit of observation of the transmission over the lines with the repeater disconnected.

Another object of the invention is the provision or" means whereby an operator at a monitoring station of the second type may eliminate the repeater from an established connection and directly connect the lines, at the same time bridging the operators set d rectly across the interconnected lines. Means are also provided whereby the operator may,

with the circuit in this condition, apply ring-' 1110' or signaling current over the lines to operate suitable signaling apparatus associated with the lines.

A further object of the invention relates to the provision of means whereby a busy signal will be given if an operator at a monitoring station of the-first type attempts to Specification of Letters Patent.

AIflER-ICAN TELEPHONE AND OF NEJV YORK.

TELEPHONE-REPEATER-S.

Patented Dec. 14, 1920. Serial No. 169,523.

connect to a repeater with which connection has already been made at a station of the second type. Means are also provided to give a busy signal if an operator at a monitorlng station of the first type attempts to listen 111 on the repeater circuit when the repeater is disconnected.

Other and further objects of the invention will be clear from the following description taken in connection with the accompanying drawing in which:

Figure 1 is a diagram of the circuit connec tions of the operators monitoring equipment; Flgs. 2 and 3 when placed end to end constitute a diagram 01? the repeater circuits and parts of the monitoring equipment associated therewith; and Fig. 1 is a simplified diagram of the monitoring circuit.

The repeater equipment shown in Fi s. 2 and 3 comprises two pairs of line conductors designated on the drawing as Line East and Line est, said lines terminating in input circuits 1 and 1 of repeaters 2 and 2. The repeaters for convenience of illustration are shown as mechanical repeaters but may be of any other type, such as, for instance, the well known vacuum tube type. The lines are balanced by corresponding artificial lines L and L The output circuits 3 and 3' or" the repeaters 2 and 2 are connected to primaries 1 and 4' of induction coils having secondary windings 5, 6 and 5, 6 in the line circuits, and secondary windings 7, 8 and 7, 8 in the artificial line circuits, the coils being so arranged that balancing potentials are applied to the input terminals of the repeaterswith respect to variations received from the output circuits 3 and 3'. Relays 9, 10 and 10 are provided, relay 9 operating when energized to open the input circuits 1 and 1 and shortcircuit the repeaters 2 and 2', while relays 10 and 10 operate to disconnect the repeaters from the lines and to interconnect the lines through conductors 25.

Ass-eciated with the repeater equipment is a monitoring equipment shown in Figs. 1

and 2. There two t ves of monitorin g stations at which the repeater is represented by twin jacks J and J The jack J may be mr tiplied at its corresponding stat-ion if r. red. Jack J may be located at a testboard remote from the repeater apparatus, while ack J, is at position convenient to the repeater for purposes of adjustment etc. Operators at these stations are enabled to listen in on the repeater circuits by means of induction coils having primaries 11 and the artificial line circuits. and 17 connecting primaries 11 and 1 1, to

11f connected-to terminals of jacks J and J said primaries "oein-g inductively related to secondaries 12, '13 and 12, '13 in the line circuits, and secondaries'l, and 14;, 15 in Conductors 16 i r the tip springs of jack J may -be disconnected from said windings and connected to conductors by a relay 18. Should .an op- ,erator attempt to connect with the repeater by means of jack J when another operator has alreaey connected with the repeater at jack J a busy tone will be given the first operator overthe contacts of relay 19.

The operators monitoring equipment for use with jack J consists of receiver 90 connectedv to the tip contacts of a twin plug P.

:The operators monitoring equipment for use "with ack J is illustrated in F 1g. 1 and comprises .a twin plug P adapted to be inserted in jack J the terminals of said plug being connected to transmitter 20 and receiver21 of an operators set through contacts of keys 22, 23-and 2%. If the plug P is inserted in jack J, receiver 90 will he connected in par allel with the primaries 11 and 11' overthe tip contacts o f-the plug in such manner that the operator may listen in on the repeater .rircuit without afi'ecting the repeater. If

the plug P is inserted in jack J, the operajtor"s listening set is associated with" prir ma'ries key 28 to the right, primary 11 is shortcira1 and 11 in parallel. Byth-row-ing cuited and the operator may listen on Line East? excluslvely. Incoming impulses on "Line East are'transmitted to. receiver 21 without amplification but outgoing impulses are transmitted after being amplified by repeater 2. Similarly by throwing key 28 to the left the operator can listen on Line lVest exclusively. f The operator is thus enabled to determine whether the amplificaticn-in each direction is satisfactory. By throwing key. 22 to theleft, or cut-out .position relays 9, lOl-and 10 may beenergized to disconnectthe lines from .tlie repeater and 11,111 the. operator can thus listen in on the transmission thus under this condition "witlthe transm ssion when the repeater is 55,

interconnect them over circuit 25. As the operators receiver is connected to-primaries the 'ljineswitheut the repeater and compare in circuit. By throwing key 22 to the right or; =ta'ik1ng positionthe opera'tors transmitts-r, which is not normally connected to the-circuitis-connected to conductors 16, 17 and the relays 9,10 and 10? are operated to disconnect the repeaterand interconnect the lines over conductors 25. At the same time conductors 16 and 17 are disconnected from the pr1-mar1es11 and 11 and bridged across conductors-25 by means of the contacts of therelay 18 ;,so that the .ope rators set is follows :and plu of plug ,bridged directly across the connected lines.

Withswitch 22 in this position ringing key I 2% may be thrown toapplyieither 16 cycle or v133 cycle ringing current over the'lines connected through the conductors 25 to operate si naling apparatus associated with the lines at a distant station. With this general description in mind the invention may now be fully understood from a descriptionof the operation. i

For convenience the sheets of the drawing including Figs. 1, 2 and 3 should be arranged end to end with Fig 1 on the left and F-ig. 3 onthe right. Assuming that an operator at the monitoring station at which the repeater is represented loyqack J desires to observe the operation of the repeater, the plug P will be inserted in jack J 7 completing a circuit from battery over the sleeve contacts of plug P and jack J through the winding of relay 26 to ground. 7 Normally windings 11 and 11 are shortcircuited, the circuit of winding 11 extending from the left hand terminal of said winding to point 27, thence over conductor 28, lower contact of relay 2 6,..contactn'29' {of jack J conductor 16, con-tact 30 of relay 18 to right. hand terminal of winding 11. Similarly the circuit of winding 11{ extends 'fromtheleft hand terminal thereoito point 27,10Ver con-' duct-or 28, lower contact'of relay 26, contact From point127 over conductor 28, contact 13'01 relay 19,upper tip contacts of jack J g receiver 90, lower tip contacts -8 and jack J, contact 53 of relay 19, to terminal 54: where the circuit divides,one path continuing over contact 29 ofjack J conductor 16, contact of relay18, and

through winding 11 baclr to point 27, and the other path extending in parallel thereto from terminal 5 L over contact 8110f jack J conductor 17-, contact32of relay"18," and through WlIlCllllgll' back to point 27., r 1

The operator may nowlisten in outhe lines interconnected through" the repeater without affecting therepeater. .;Inc o ming voice cur-rents from Line East actuate reput circuit 8 act through winding 4; to in duce potential variations in windings 5f, 6, 7 and 8 whereby said amplified voice currents from Line East are transmitted over Line lVesti and artificial line L., "llhe' .peater- 2 and the amplified currents ino utpotentials inv Line West and line L""-are 113a battery.

in such direction that the input terminals of repeater 2 are at points or" equal potential so that no effect is produced on repeater 2. At the same time these potentials act cumulatively as to coils 12, 13, 14 and 15 to induce potential variations in winding 11, whereby the amplified voice currents are transmitted to receiver 90 over the circuit already traced. Similarly voice currents coming in over Line est are amplified by repeater 2 and thus amplified, are transmitted over Line East thereby actuating reoeiver 90 through inductive action on winding 11.

The operator at the monitoring station at which jack J is located may disconnect the repeater from the lines and interconnect the lines through conductors by withdrawing plug P and inserting an idle plug in the lower'half of twin jack J, thereby closing a circuit from ground, contacts 56 and 57 of jack J, contact 58 of relay 59, and through winding of relay 60 to battery. Relay 60 upon being energized closes the following circuits: 4

From ground, lower contact of relay 60, winding of relaylO, and winding of relay 9 to battery, and from ground, upper contact of relay 60, winding of relay 61, wind-- ing of relay 10 and winding of relay 9 to Relays 9, 10, 10 and 61 are energized. Relay 9 operates to open the input circuits 1 and 1 and shortcircuit repeater elements 2 and 2. Relays 10 and 10 disconnect the lines from the input circuits of the repeater elements and interconnect the lines through conductors 25 Should another operator at the same type of monitoring station insert a plug into a multiple of jack J in an attempt to bridge an open ators set across the tip contacts of such jack, relay 26 would be energized thereby closing a circuit from ground, over upper contact of relay 26, contact of relay 61 (now energized), through winding of relay 19 to battery. Relay 19 operates t open contacts and 53 and close contacts 63 and 64:, thereby applying a busy tone to the tip springs of jack J and its multiples, so that he operator receives a busy signal indicating that the repeater is either disconnected or under the control of another monitoring operator. 7

Assuming nowthat an operator at the V monitoring station at which the repeater is represented by jack J, desires to connect with the repeater, the twin plug P of an operators monitoring equipment such as illustrated in Fig. 1 is inserted in the twin jack J thereby closing an energizing circuit for relay 59 from battery, sleeve contacts of plug P, and jack J winding of relay 59 to ground. Relay 59 pulls up, opening its contact 58 and closing contacts 65 and 66. The closing of these contacts does not at this time produce any effect. Upon inserting the plug P in jack J how ever, the operators receiver 21 is bridged across the windings 11 and 11 as shown in the simplified diagram of Fig. 4. The circuit may be traced as follows:

From point 27, over conductor 28, contact 6? of jack J over contacts 68 and 69 of key 23 in parallel, over conductor 70, contact through receiver 21, contact 86, conductor T1 to spring 72 where the circuit branches, one path continuing over contact Y3, contact 7 1, conductor 13, upper tip contacts of plug 1, and jack J conductor 16, contact 30, and through winding 11 back to point 27', the other path continuing from spring 72 over contact 75, contact/(6, conductor 52, lower tip contacts of plug P and jack J conductor 17, contact 32 of relay and through winding 11 to point 27. If the operator desires to listen in on Line East exclusively, key 23 may be thrown to the right or E position thereby shortcircuiting winding 11 as indicated schematically in Fig. 4 with switch S in dotted line position. The receiver 21 is now in circuit with winding 11 over the circuit already traced, while the shortcircuit for winding 11 may be traced as follows:

From point 27, over conductor 28, contact 67, contacts 77 and T8 of key 23, contact 76 of key 22, conductor 52, lower tip contacts or plug P and jack J conductor 1'2" contact 32, and through winding 11 to point 27.

in a similar manner by throwing key 23 to the left r 1V position, winding 11 may be shortcircuited through contacts 79 and 80 of he 23, the winding 11 remaining in circuit with the receiver 21, so that the op erator may listen in on Line est exclusively. The result is indicated in a con ventional manner in Fig, 4 with the switch S1 in dotted line position.

tihould the operator desire to disconnect the repeater, key 22 may be thrown to the leior out out position, thereby closing a key, contact 66 of relay 59, (now op rated), winding of relay 60 to battery. Relay 6O pulls up and closes circuits already traced through relays 9, 10, 10 and 61 whereby the repeater is disconnected and the lines interconnected through conductors 25 in a manner already described. As the receiver is connected with windings 11 and 11. over the circuits above traced, the transmission over the lines with the repeater disconnected be observed and compared with the transmission with the repeater in circuit.

Should the operator desire to talk over the lines, key 22 may be thrown to the right talking position, closing a circuit over i contact 33 for relay 84, whereby the receiver 21 is connected in parallel with winding The operation of key 22 also closes a circuit from ground over contact 82 to terminal 83 where it branches, one path extending over contact 84, contact 66, winding of relay 60 to battery, and the other path continuing from terminal 83, over contact 65 of relay 59, (now operated), through winding of relay 18 to battery. Relays 60 and 18 are energized,

the former; actuating means to disconnect the repeater and interconnect the lines di- 'rectly through conductors 25 in a manner already described, and the latter operating to open contacts 30 and 82 and close contacts 85' and 86, whereby conductors 16 and 17 are disconnected from windings 11 and 11 andconnected to conductors 25. The operators ,set is now bridged directly across the common terminals or the interconnected lines, the bridge being traced as follows:

From point87, over contact 85, conductor 16, upper tip contacts of plug P and jack J 'conductor 43, contacts 44, and 46, conductor 47, winding 41, winding 39 and receiver'21 in parallel, conductor 48, contacts 49, and 51, conductor 52, lower tip contacts of plug P and pack J conductor 17, contact 86'to point 88. The operators set is connected directly to the line and the repeater disconnected for the reason that if i the set were connected to'theline a condition of unbalance would occur which would' set up singing. By directly connecting the set to the lines transformer losses are avoided.

By manipulation of the ringing key 24,

i the o erators set 'ma be disconnected from O ioyrcle current being applied if the key is' thrown to the right. enabled to test signaling apparatus assothe bridge above traced and ringing current applied thereto, 16 cycle'current being ap plied if the key is thrown to the left, and 183 The operator is thus ciated with the lines and responsive to ringing current.

If at anytime while an operators set is connected to the line through jack J another operator plugs into jack J the latter operation results'in the energization of re-v lay 26 in a manner already described, whereby a circuit is closed. from ground over upper contact of relay 26, contact 89 ofijack J (closed by the insertion of plug P and through -wind1ng of relay 19 .to battery,' energizing said relay, whereby contacts 43" and 53 are opened and contacts 63 and 64 I are closed to apply a busy tone to the operators set connected to the tip contacts of jackJ. i

VVh'ile the invention has been illustrated ganization itis to be understood that it is capable of embodiment in many and widely varied forms without departing from the scope ofthe appended claims.

and described as embodied in a specific or- 7 What is claimed is 1. In combination with a telephone re-' peater, monitoring stations at which the operation of said repeater may be observed,

monitoring equipment at said stations, and means whereby when monitoring equipment is associated with said repeater at one of saidstations, a busy test will be applied to .monitoringequipment at the other station.

2. In combination, transmission lines, a

repeater interconnecting said lines, a moni toring station, terminals oi said repeater at said station, means whereby the repeater may be disconnected from the lines, and means whereby when the repeater is disconnected from the lines a busy test is applied to said terminals. V or 3. In combination, transmission lines, a repeater interconnecting said lines, a monitoring station, multiple terminals of said repeater at said station, means'cooperating with one of said terminals whereby the re- 5. In combination with. a repeaten'a plurality of monitoring istations, .monitoring equipment at sa d stations, terminals corresponding to the {repeater at each of said stations whereby monitoring equipment may 7 be associateclwvitli said repeater, and means whereby when monitoring equipment is associated with said repeater over the terminals of one of said stations a busy signal will be applied to a monitoring equipment applied to the repeater terminals at the other station. a

in opposite directions,transmission lines interconnected through the repeater, monitoring station, monitoring equipment at said station, and means whereby said monir r ,110 6. In combination with a rrepeater'comfl prising two-repeater elements for repeating toring equipment maybe associated 'witli'the V circuit of each ofisaid'repeater elements independently of said lines e In comb nat on with a repeater comprising two-repeater elements for. repeating in opposite directions,transmission lines in- -terconnected through therepeater, an pera tors set, and means whereby said set may be connected with the circuit of each of said repeater elements independently" of .said

transmission lines.

r 8. In combination'witha repeater having a, plurality of output circuits, an operatoids" circuit, induction coils .for associating the operators circuit with each of said output circuits, and an operators set in a bridge with said induction coils in parallel with respect thereto.

, 9. In combination with a repeater having a plurality of output circuits, an operators circuit, induction coils for associating the operators circuit with each of said output circuits, a bridge connection shortcircuiting said induction coi s, an operators set, and means whereby said set may be connected in said bridge.

10. In combination with a repeater having a plurality of output circuits, an operators circuit, induction coils for associating the operators circuit with each of said output circuits, an operators set in a bridge with said induction coils in parallel with respect thereto, and means for shortcircuiting said induction coils at will.

11. In combination with a repeater having a plurality of output circuits, an operators set, means for associating said set with all of said output circuits, and means operable at will for disconnecting said operators set from certain of said output circuits whereby the set may remain associated exclusively with the other circuits.

12. In combination, transmission lines, a repeater for interconnecting said lines, monitoring equipment, means for associating said equipment with the repeater, and means .operable only when the equipment is so associated for disconnecting the repeater from the transmission lines.

13. In combination, transmission lines, a repeater for interconnecting said lines, an independent circuit for interconnecting said lines, a monitoring equipment including an operators set, means for associating said equipment with the repeater, and means operative at will for disconnecting said repeater and connecting said lines through said independent circuit, and for associating said operators set with said independent circuit.

14. In combination, transmission lines, a

repeater for interconnecting said lines, an

operators set with said independent circuit, and means for applying ringing current to said independent circuit.

15. In combination, transmission lines, a repeater for interconnecting said lines, an operators equipment including a transmitter and a receiver, means for associating said equipment with a plurality of said lines with the receiver in separate inductive relation to each line, so that voice currents transmitted over the lines and through the repeater will actuate said receiver, and means operative at will for directly connecting said receiver with said lines independently of the repeater.

16. In combination, transmission lines, a repeater for interconnecting said lines, an operators equipment including a transmitter and a receiver, means for associating said equipment with a plurality of said lines with the receiver in separate inductive relation to each line, so that voice currents transmitted over said lines and through said repeater will actuate said receiver, and means operative at will for directly connecting said re ceiver with said lines independently of the repeater and for associating said transmitter therewith.

In testimony whereof, I have signed my name to this specification this eleventh day of May, 1917.

JOHN F. TOOMEY.

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