US1540849A

US1540849A - Signal-storing arrangement

Info

Publication number: US1540849A
Application number: US713572A
Authority: US
Inventors: Owen H Loynes
Original assignee: American Telephone and Telegraph Co Inc
Current assignee: AT&T Corp
Priority date: 1924-05-15
Filing date: 1924-05-15
Publication date: 1925-06-09
Anticipated expiration: 1942-06-09

Description

June 9. 1925.

O. H. LOYNES 5mm. s'roaxm Anxmemmn'r filed may 15, 1924 2 sheets-shame:

IN VEN ,Zqy/zar A TTURNEY June 9, 1925.

c). H; LC'JYNES SIGNAL STORING ARRANGEMENT 2 Sheets-Sheef 2 Filed May 15 1924 u -INVENTORV Qlflfll/IZEJ Patented June 9, 1925.

ft it 1,54%849 UNITEDSTATES. pail-3hr QJFFICE.

own-n I-I. LoYivEs, or nnookLYn, New YORK, ASSIGNOR 'ro AMER-roan TELErH'oNn AND TELEGRAPH co umns A, coerce-arms or new YORK.

sierra-troerne Application filed May 15,1924. seriaino. 713,572.

To all whom it mag concern:

Be it known that I, OWEN H. LoY ns, residing at Brooklyn, in the county of Kings and State of New York' have in vented certain Improvements in Signal- Storing Arrangements, of which the following is a" specification. I

This invention relates to transmission systems oi the type overWhich a plurality of carrier fl reqii ency channels may be simultaneously transmitted and moreparticula'r- 1y relates to improvements in signaling arrangements for such systems;

In multiplex or carrier telephony systems, it. is the practice to superimpose on the various carrier channels a certain frequency for ringing orsignaling purposes as Well as the voice frequencies. The carrier channels, when thus modulated, are sent out simultaneously over a lineto a distant 'st'ationr It has been found that When similar ringing frequencies are superimposed; on two of the different carrier channels simultaii'eously that considerable interference is apt to result therefrom when the carrier channels are transmitted out over the line. In other words, if two operators ring at the same time, even though on dilierent carrier channels; the result is notalways sat isfa'ctoi-y. Accordingly, it is the purpose of this invention to provide a signal storing device common to a plurality of carrier channels that will automatically hold up a ringing signal until' no other ringing signals are being transmitted over the carrier channels and then allow said signal to be transmitted; so that only one ringing signal may be" transmitted over the channels at' onceand all interference may be obviated. Other features and objects of the invention Wil i appear more fully from the detailed description hereinafter given. The inventionmaybe more fully understood from the following description to nether with theaccompanying drawing in the Figures 1 and 2 of Which the invention is illustrated. Fig. 1' shows a schematic diagram of a system embodying the arrangements of the invention, While in Fig. 2 are shown in detail the circuit arrangements of the signal storii'ig device;

In Fig. 1 is shovvna line L over which the normal telephonic currents are transmitted; Line L terminates in the balancing network N and includes the windings 01 a hybrid coil 1. Associated with coil 1 is a circuit 2 leading to modulator apparatus notshown. The telephonic currents from line L are'transmitted- "over circuit 2 and are superimposed on a carrier channcl at the modulator apparatus and are then transmitted through filtering apparatus to a common line. Associated' with the midpoints of the Windingsof coil 1 is a circuit?) leading to demodulator apparatus not shown. The modulated carrier channel coming in over the common lineiis transmitted through filtering apparatus to the demodulator; andthe telephonic currents are then transmitted'from circuit 3' to the line Associated with the line L and the circuits 2 and 3"is a ringin'g'or signaling' circuit comprising the composite ringer apparatus A, illustrated schematically, and the signal storing device X. The low frequency ringing current; herein, termed 2O cyclewcurrent for purposes of illustration, maid be transmitted from line L "to the composite ringer setA Where" it would actuate mechanism to place a groundon lead A K This Would startzthe signal storing device X7 in operation With respect to the signal from line L As will be: pointed out in detail later on, at the propertinie" the signal storing device X would cause a suitable ringingfrequency; herein termed? 1,000

ringer set A Where they would actuate means responsive to a treq'i'iency of 1,000 cycles: These means in t rn would operate the cut-off relay 2 and Woul'dRcause to he applied to th'e'l'ine L -a' suitable ringing frequency such as cycles. the prieciples' ofthe composite ringer set A are well known in the art, no further description thereof will be given.

Associated witlrthe signal storing device X might be other compositeiinger sets such nelsand transmitted out over the common line. ,The ringin signals coming in over the carrier channe s wonldiin turn be transmitted from the respective demodulator circuits through the signal storing device and the. composite ringer sets 13, C and D to the respective telephone lines. Composite ringer set E is associated with the signal storing device X by the leads B B and B The signal storing device X in turn will be -associatedwith the modulator and demodulator circuits of the line with which the composite set B is associated by the leads F F and F 3 in a similar manner to that, illustrated for the composite ringer set At The composite-ringer sets 0 and D are connected to their lines and'respective modulator and demodulator circuits through the signal storing device X in a similar inanner. 1th this arrangement, the signals 'from one line, such as L will be transmitted through the composite ringer set A to the signal storing device X. If at this time no other ringing signals are being transmitted over theother carrier channels on the. common line, the ringing signal from line L will be superimposedon the proper carrier channel for line A. However, if at this time aringing signal from one of the other lines, such as the line associated with composite ringer set 1%,- was being trans mitted, the signal from line L would be automatically stored up by the signal storing device Xuntil the termination of the other ringing signal, at which time the ringing signal from line "L would be trai1smitted. .lVith this arrangement, two ringing signals will not be sent out on the coinmon'line 'on their respective carrier channels at thesame time, and all interference between ringing signals will in this manner be eliminated.

In Fig. 2 is shown in detail the circuit arrangements of the signal storing device X. The device X has been illustrated as an arrangement common to four carrier channels although it might be utilized for any number of channels of-a system.

I The leads A A A E,, Fi and E of Fig. 1 correspond to leads similarly marked on Fig. 2. Leads marked B, C, D, F, G and H with the subscripts 1, 2, and 3 of Fig. 1 correspond to the similarly marked leads of Fig. 2. The signal storing circuit comprises four sets of relays. The relays 10, 11, 12,'and 13 lays 18, 19, 20, and 21 which may be termed the operating relays. These relays serve to connect the ringing source to the respective carrier channels. A fourth set of relays 25, 26, 27, 28 and29 is provided. These relays are slow-acting relays and operate in sequence to control the time interval of the ringing. The arrangements operate in the following manner: A cycle ringing impulse transmitted over the line LA of Fig, 1 will operate the composite ringer A so that it will place a ground on the lead A Referring now to Fig. 2, the ground placed on lead A Will cause the relay 10 to operate. This relay will lock up inthe following manner: From its upper make contact over conductor 30 to the lower back contact of relay 18 and ground. The opera- .tion of relay 10 will operate relay, 14 as folground. This will operate'relay 23 which will close the following circuit: From ground, armature and contact of relay 23, conductors and36, winding of relay 22 to battery-and ground. This will operate relay 22 which will close the following circuit: From ground, lower contact and armature of relay 22, conductor 37, left-hand contact and armature of relay 1 1, conductor 38, winding of relay'18' to battery and ground.- The closing of this circuit will operate the relay 18.. The operation of relay 18, through'its lower break contact, will open the previously traced circuit for relay 10 and cause said relay to release. ll-elay 14L willthen be held operated through the upper make contact of relay 13 as follows: From ground,conductor 31, conductor 30,

contact and armature Yof relay18, conductors 40 and 33 and thence through the winding of relay l l to battery as previously traced. With relays 18and 22 operated, a 1,000 cycleringing source will be connected over the contacts of relay 22 to conductors l'aiid wand thence over the contacts of loo relay 18to the leads and E, from whence ,th y will be applied to the modulator crr- The 1,009 cycl'e "ringin current wlll then be applied from these leads t'o the' m'odula'tor circuit and s up'ernnpesect n the car- 7 tier channel associated Wlilll line L tor over leads E, and I), and over the back contarts relay 1%8-tothe leads A, and A, from wl'ience it will be transmitted to the com posite" ringer ap aratus A, where it will actuate mechanism to operate the line relay 2, and to apply cycle ringing current to the condiui tors of line L The duration of the ringing impulse is determined by the source of slewacting relays- 25, 26, 27, 28, and 29. The operation of relays 23", heretofore referred to, closes the following circuit: From gro-und armature and contact oirelay 2'3, co ductor 35, break contact of relay 29*, eondiiciior 4 3, winding of relay to battery and ground: This will operate the relay 25. Operation of relay 25 will in turn operate relay 26 which will in turn operate relay 27 which will in turn operate relay" 28 which turn operate relay 29. Upon theoperatio-nof relay 2'8, ground will be applied from the arnlature and contact of said relay, over conductor 44, through the right-hand winding of relay 24 to battery and ground. This relay will lock up through its left-hand winding and the righthand ni'al'ic' armature of relay 1%. The operation of relay 2th will release relay 23. The ground connection originally established from the armature and contact of relay through the winding of relay 22 will, however, be maintained at the armature and contact of relay 29. The operation of relay 29 and the deenergization of relay 23 will cause relay 25 to release. This in turn will release relay 26 which in turn will release relay 27 which in turn will release relay 28 which in turn will release relay 29. The release of relay 29 will remove the ground from the winding of relay 22 and release relay 22. The release of relay 22 will disconnect the ringing current from the leads E, and I and will also cause relay 1.8 to be released which in turn will release the relay 14: and restore the arrangements to normal. Ringing impulses coming in over any of the other leads, such as B C or 1),, would operate, respectively, the relays 11, 12, and 13 Whichwould lock up over the lower contacts of relays 19, 20, and 21, Upon the release of the relay 14, one

of the other relays, such as 15, 16,- and 17, might be operatedif a ringing signal had come in and operated one of the rela s 1 1, 12, and 13 Accordingly upon the term ination: of the ri g'ing signal coming '1 over lead A the circuit will be in cone on for the operation of a ringing sigiial stored up on one of the relays 11, 12, and 13.- The a'ri'a' gments in such instances are sub stantially similarto those already described. The fact'tha't only one of the relays 145, 15,

l e, and 17 can operate at a time thus prevents the simultaneous transmission ringingsi'gnalsi Vi hile the signal. storing device-lias'h'een illustrated in connection with a carrier system in which the various channels are combined oiia' conunon li'n-e', it might equally well beutil'ized with a plurality ofindependent circuits;

lleccorci'ingly, while the arrangements have been disclosed as embodying a specific form which is deemed desirable, it is to be understood that they are capable of embodiment in o-tl depart and widely varied forms without g. from the spirit and scope of the invention as defined in the appended claims.

Vi hae' is claimed is:

1. A: plurality of telephone lines over which voice frequencies are transmitted, means associated with each of said lines for superimposingsaid voice frequencies on separate carriercliannels" for transmission over a GOIHHIOH circuit, signaling circuits associated with each of said lines and said last mentioned means, and a signal storing device common to all of said signalingcircuits torvcausing the signals to be transnritted over said carrier channelsarate tiines- 2. A. carrier system comprising a pinrality of telephone lines, modulator and demodulator circuits associated with each of said lines and with a common line, signal ing circuits associated with each of said telephone lines and their respective modulator and demodulator circuits, and a signal storing device common to all of said signaling circuits, said signal storing device con'iprising a plurality. of responsive means each one individual to and responsive to the signals trom dilierent ones of said telephone lines, a plurality of controlling; means at sepsignal storing device comprising a plurality of responsive means each one individual to and responsive to the signals coming in from different ones of said slgnahng systems, a plurality of controlling means each.

controlled by one of said responsive means and arranged so that only one Will operate at a time, and a pluralityof operating means each one controlled by one of said controlling means for transmitting outgoing signals over said systems.

storing device common to all of said signaling circuits, said signal storing device comprising a plurality of responsive means each one individual to and responsive to the signals from dilferent ones or said telephone lines, a plurality of controlling means each controlled by one of said responsive means and arranged so that onlyone will operate at a time, a plurality of operating means each one controlled by one otsaid controlling means whereby signaling current may be applied to said signaling circuits, and

means for controlling the duration of ap plication of said signaling current.

5 A- plurality of independent signaling systems, a signal storing device common to all of said systems for storing up the sign'als coming in over said systems and causing the outgoing signals to be transmitted one at a time, said signal stormg device comprising a plurality of responsive relays each one individual to and responsive to the signals coming in from different ones of source of signaling current, a signaling relay controlled by any of said control relays, a plurality of operating relays each one controlled by different ones of saidcontrol relays, and means controlled by said signaling relay and any of said operating relays for applying signaling, current from said source to said signaling systems.

6. A plurality of independent signaling systems, a signal storing device common to all of said systems for storing up the signals coming in over said systems or causing the outgoing signals to be transmitted one at a time, said signal storing device comprisinga plurality of responsive ;re lays each one individual to and responsive to thesignals coming in from different ones of said signaling systems, a plurality of controlling relays each controlled by different ones of said responsive relays and ar ranged so that only one willoperate at a time, a source of signaling current, a signaling relay controlled by any of said control relays, a plurality of operating relays each one controlled by different ones of said control relays, means controlled by said signaling relayand any, of said operating 1 relays for applying signal current from said source to said signaling systems, and a chain of slow operating relays for controlling the duration of applicatlon of said signaling current andv for restoring said" signal storing device to normal. 7

In testimony whereof, I have signed my name to this specification this 14th day of May 1924. I

OWEN r1. LOYNES.