US1567060A - Telephone-exchange system - Google Patents

Description

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM 15 Sheets-Shet 1 Filed March 31 Mven/ars Leo /fe//er. Jamae/ 5 Wi/Mams L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Dec-29 1925- l Sheets-Sheet 2 //7l/6/7/0/"$: Lea /fe/(. Samue/ B. W/flmms Filed March 31 1923 Dec. 29 {1925. 1,567,060

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 31, 1925 15 Sheets-Shet 3 //7 van/ans: A e0 /fe//e/: Ja/m/e/ B. W/7/f0/775 Deg. 29 1925.

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 51, 1923 15 Sheets-Sheet 4 //7 van/0m.- 1 e0 /fe//er.

Samue/ 5! [MW/mm" Dec- 29, 1925 7 0 L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 31 1925 15 Sheets-Sheet 5 Fly/2.

6 w a 0 e 7 6 FD l e h s 5 l M E m mm L 59 A l n nb Mm RH Emm L M L EM ma K mu LF E T Dec. 29, 1925. 1 561,060

L. KELLER Er AI.

TELEPHONE EXCHANGE SYSTEM Filed March :51, 1923 15 sheets-sht 7 Dec. 29 1925.

1,567,060 L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM l 'iled 31 1 15 Sheets-Sheet 8 hue/7mm. Zea /fe//e/'. Jamue/ 5. W/'///'0/775 Dec. 29, 1925. vv1,567,060

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Fi ed March 31 1923 15 Sheets-Sheet 9 W e/#0115.- Leo hel/er. Jamue/ 3 Wf/l/ams Www Dec. 29 1925. 1,567,060

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 31, 1923 15 Sheets-Sheet 10 Q //1 veh/an' Zea /fe//er.

Jamae/fl Wf/l/ams Dec. 29, 192 1,567,060

- L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Dec. 29, 1925. v 1,567,060

L. KELLER El AL TELEPHONE EXCHANGE SYSTEM Filed March 31, 1923 15 Sheets-Sheet 12 Dec. 29, 1925. 1,567,060

L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 31, 1925 15 Sheets-Sheet l Wye/7mm: Leo ffe//e/'.

O l w a \.&m 7 e a 6 & W .r 1 a QR e e W 5 1 1 m as M; T ma RH E Lam mm mm mfi E T Dec. 29 1925.

Dec. 29 1925- L. KELLER ET AL TELEPHONE EXCHANGE SYSTEM Filed March 31 1923 15 Sheets-Sheet 15 xkkim QEQ QQ QQ Patented Dec. 29, W25.

. UNETED STATES PATENT OFFICE.

LEO KELLER, OF NEW YGRK, AIID SAMUEL B. NILLLAMS, OF BROOKLYN, NEW YORK, ASSIGNORS TO "WESTERN ELECTRIC COMPANY, INGORPORATED, OF NEW YORK,

N. Y., A CORPORATIQN OF NEW' YORK.

TELEPHONE-EXCHANGE SYSTEM.

Application filed March 31, 1923. Serial No. 628,988.

To all whom it concern.

Be it known that we, Leo KELLER and SAMUEL B. Wrnnnmrs, citizens of the United States, residing at New York, in the county of New York, and Brooklyn, in county of Kings, respectively, and State of New York, have invented certain new and useful Iniproveine'nts in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates, in general, to telephone exchange systems and more specially to systems employing machine switching apparatus for the establishment of conversational connections.

The object of the invention is an improved arrangement for distributing or apportioning the traffic to the switching apparatus of the exchange.

A feature relates to the provision, in a system where the switches are divided into groups with a controlling mechanism allotted to each group, of means for diverting the tratfic normally incoming to a given group of switches to other switches when trouble occurs in the corresponding controlling mechanism.

Another feature relates to the provision of an arrangement whereby the controlling mechanism allotted to a group of switches alters the control of such switches to divert calls to an operators position which normally would be directed into a succeeding group, providing trouble exists in the equipment of such succeeding group.

Other and further advantages of this invention will be pointed out in detail in the description hereinafter and also in the appended claims.

Considering the drawing, Figs. 1 to 14, inclusive, when arranged in the order illustrated in the diagram of Fig. 16 disclose the details of a telephone system incorporating the features of the present invention.

Fig. 1 illustrates a line SWltlll 9f the co ordir to type in which the subscribers lines terminate. and also two of av number of trunks outgoing to a district selector switch. 7

F 2 shows certain control elements associated with the outgoing trunk and also illustrate. a t ouble operator s position.

3 disc. H esp district Selector switch of the coordinate type in which terminate the trunks incoming from the line switches.

Fig. 4: illustrates a coordinate group selector switch in which terminate the trunks incoming from the district selectors.

Fig. 5 shows a coordinate connector switch for completing connections to the subscribers lines.

Fig. 6 represents a sender selector switch also of the coordinate type.

Figs. 7, 5 and 9 depict one of a number of register senders.

Fig. 10 shows a sender connector device for connecting any of the plurality of senders with the common marker or selection controlling device.

Figs. 11 and 12 illustrate the marker con trolling device.

Fig. 13 shows a sender connector device for connecting the line marker with any of the several register senders. This figure also shows the testing relays for testing the condition of the trunks incoming to the group selector and connector switches together with certain control elements of the line marker.

Fig. 14 discloses the remainder of the line marker.

Fig. 15 is the schematic showing of a telephone system employing switches and controlling apparatus of the type shown in detail in the other figures.

Referring to Fig. 15, the subscribers lines entering the exchange appear as calling lines in a number of coordinate line switches 1500, 1501 and 1502. The rectangle 1500, for example, may represent a plurality of switches which receive a given group of calling lines. Likewise, rectangles 1501 and 1502 represent other switches receiving other groups of calling lines. The trunks outgoing from the switches 1500 are distributed in any suitable manner among a plurality of groups or divisions, each division consisting of a plurality of district or first group selector switches.

The rectangles 1503, 1504 and 1505 each represent a plurality of district selectors which all taken together comprisethe first group or division of switching equipment. Certain of the trunks outgoing from the line switches 1500 15.0], 1502 are directed into the district switches of this first division. Similarly, other trunks outgoing from the line switches are distributed among the district selectors of a second group or division comprising district selectors 1506, 1507 and "1508. Likewise, as many other divisions distributed that any of the district selectors may obtain access to any of the. different terminal line groups.

The first division of switches is provided with a plurality of register senders 1514., 1515, etc., a. single district marker 1516 and the requisite number of sender selector switches 1513. The sender selectors 1513 serve to pick out an idle one of the register senders and associate it with the trunks extending from the line switches'to the district selectors of the first division. The senders are all associable with the district ina'rker 1516, which in turn, may be assoc ated with any one of the district switches in the first division in order to control the setting movement of such switch. Likewise, the second divisionis provided with similar equipment consisting of sender selectors 1517, senders 1518, 1519, etc. and district marker 1520.

The terminal line groups are provided with individual line markers 1521 and .1522 which are associable with any register sender pertaining to any division and which control the group selector and connector switches o'fthat particular group to complete the connection throughto a called line.

Should it be discovered that the district marker 1516 pertaining to the first division is in trouble or should for any reason itbe desirable'to prevent calls coming into the district selectors of such division. the trouble operator throws a key 1526. This key serves to render all trunks which lead into the district switches 1503, 150 1 and 1505 of the first division non-selectable to the line switches. This means that-the trafic incoming to the line switches will now be forced to find its way over trunks outgoing from the line switches into the district switches of other divisions. In a similar manner should trouble exist in the second, or any of the otherdivisions, the operator-by throwing a key similar to the key 1526 would divert trathc from such CllVlSlOD. Again should.

General description of the system and apparatus.

The line switch 100, selector switches 300 and 400, connector switch 500 and the sender selector switch 600 employed in this system are of the coordinate type such as shown and described in the British Patent 183,436, ac-

cepted August 23, 1923, granted to the lVestern Electric Company, Limited, and in the patent to S. B. Williams, No. 1,517,331, granted December 2, 192 1. 7

The subscribers lines enter the exchange and appear inthe coordinate line switches in vertical rows and 111, each line having access to a group of horizontal links such as the groups represented by links 106,

107, and links 108, 109. Line 101, for instance, has access to the group of links containing the links 106 and 107. Each of the outgoing trunks 11.4: and 1.15 occupies a full vertical row of contacts 112, 113 and leads to the district switches.

The trunk 114; which is shown in full appears in the district switch 300 occupying the vertical row of Contacts 308. Another trunk 115=outgoingfro1n the line switch 100 is shown occupying the full vertical row of contacts 309. District selector switch 300 also has a plurality of groups of outgoing trunks appearlng 1n the rows 311, 312, 313,

'etc. 7 Each outgoing trunk is snown having an appearance before a single one of the horizontal links 331, 332, 333, etc. These trunks are multipled as explained to appear before corresponding horizontal links in all other district selectors of the same division.

Since the subscribers lines are divided into a number of groups of called lines, known as terminal line groups, the trunks outgoing from the district switches are arranged in corresponding groups so that the district switches have access to any of the terminal line groups. of the switching appa -atus. The group of trunks appearing in the upper section 302 of the vertical row 311 inthe district switch 300 lead to the group selector switches of a particular terminal line group. One of these trunks is shown leading to the group selector switch 400. The group oi trunks occupying the lower section of the same vertical row may run to the group selectors of the same or of a. different terminal line group, as desired. Other groups outgoing from the district switches are distributed to other terminal line groups of switching apparatus. In addition to these groups of trunks leading-s to the terminal line groups, the district switches may be provided with trunks extending in other directions. For instance, the group of trunks appearing in the section 301 of the vertical row 314E lead to an answering operators position 330.

The groups of trunks outgoing from the group selector 400 and from other group selectors in the same terminal group are distributed to a suitable numberof connector switches. One or" these connectors 500 shown and a sin le trunk incomin from the selector switch 100.

The called subscribers lines appear in the connector switches in groups. For example, the'vertical rows 52 1, 525, each represents a group of subscribers lines. Each line is ac veessible over a group 01' horizontal links.

The line 516 appears in the group occupying the vertical row 525 and is accessible by a groupot' links, two of which, 501 and 502,

are shown. A second line 526 appearing in the same group 1s accessible by another group of horizontal links 504, 505.

The district marker shown in Figs. 10, 11 and 12 includes two registers 1101 and 1102 .which receive their registration from the controlling senoer. These registers determine the setting of a multicontact relay translating device 1100 wluchresults in the I selection of one of a number of group relays 1230, 1231, 1232. These latter relays determine the setection ot' a group of trunks at the district switches. Furthermore, the translator comprises two sets of testing relays 1200 and 1203. The set 1200 serves to test the horizontal links of the section 302 in any district selector switch of this division and also to test the outgoing trunks which have access to these horizontal links. Connecting device 1202 which comprises a number of multicontact relays 1215, 1210. etc. serves to connect the set of relays 1200 with the proper group of outgoing trunks. Likewise. the other set of test relays 1203 serves of outgoing trunks.

with respect to the set of horizontal links 301 all switches and the outgoing trunks to The connect ing device 1201 consisting of a number of relays 1212. 1213. etc, acts to associate the testing relays 1208 with the proper groups Also a connecting de' vice 1201. consisting of Inulticontact relays 1222, 1223, 219. 1220, 1225 and 1226 serve to connect the marker testing relays with the individual switches of the division.

The line marker shown in Figs. 13 and 14. includes a plurality of registers 1 100. 1 101 and 14.1 )2 which receive the nun ierical record from the controlling sender. It also includes a inulticontact relay translating device 140-1- which is operated according to the settings of the registers to select the magnet 511. individual to the dilicrent vertical rows of outgoing lines in the connector switches. It oreovei'. the marker includes a multicontact relay device l i-03 which serves to associate the register 1 101 with a connecting device 510 individual to the proper connector switch 500. The device 510. consisting of relays 511, 512. etc., serves to associate certain test relays with the horizontal links of. the group having access to the called lines oi the desired units designation. In Fig. 13 the set oi testing relays ot the marker are associable through the niulticontact relay connecting devices 401 and 402 with the groups of trunks outgoing filOIl'l the selector switch and other switches and with the horizontal links 01? these group selectors.

Detailed description of establishment of (6 connection.

Consider that the subscriber of line 101 d sires to hold conversation with the subsc iber at line 510 appearing in the same central oii' ce. It may also be assumed that the directory number of line 516 is A B 1 2 3 -11. lVhen the subscriber of line 101 takes down his receiver a circuit is closed from battery through the winding of line relay 121. inner contact of cut ofli relay 120. coiuluctor 10-1. through the substation and returning over condiuaor 10 3 to ground at the outer contact of relay 120. .lclav 121 operates and a circuit is closed from battery through the winding o't relay 129. right back contact of relay 128. left contact of relay 12]. conductor 150 to ground.

Relays 128, 129 and 130 enclosed within the broken rectangle pertain to the vertical group of lines appearing in the row o't' the switch 100. These relays are brought into action whenever one of the lines in the cm'responding group initiates a call.

Relay completes a circuit from battery through the winding of relay 131. inner front contact of relay 129 to ground. Relay 129 also closes a circuit troni battery through the left-hand winding of relay 130. outer front contact of relay 129. left back contact of relay 135. outer right contact of relay 137, conductor 158 to ground. Rel-av 130 operates and closes a circuit For relav 12S. Relay 128 looks through its left contact and the left contacts of relays 131 and 132 to ground. Relay 130, in operating, completes a circuit;- troni battery through its right-hand winding and inner right contact, winding of relay 135. outer right contact of relay 137. conductor 158 to ground. Relay 135 operates and closes a circuit from battery through the winding ot slow-to-release relay 130. inner contact of relay 137, conductor 158 to ground. Relay 136 closes a substitute holding circuit for relays 130 and 135 independent of the relay 137.

WVith relay 135 operated a circuit is closed from battery through the winding of the vertical magnet 116, outer right front contact of relay 130, left front contact of relay 135, contact of relay 136, conductor 158 to ground. The magnet 116 operates and prepares the contacts in the vertical row 110. Magnet through its contact, conductor 159, inner contact of relay 134, outer left contact of relay 130, right contact of relay 121, left-hand winding of relay 122 to battery. The relay 122 is a group relay individual to the group of horizontal links including the links 106 and 107. Similarly, relay 123 is a group relay individual to the group containing the links 103 and 109. Relay 122 operates and closes a circuit from battery through its right-hand winding and right front contact, right back contact of relay 123 (assuming this relay to be deenergized), winding of relay 134, conductor 159 to ground at the contact of magnet 116. Relay 134 also operates in this circuit.

Another circuit is closed from battery through the winding of the vertical operating magnet 118, brush 144 of allotter switch 143, contact of slow-to-release relay 139, left contact of relay 137, outer right contact of relay 135, conductor 158 to ground. It is assumed that the first one of the outgoing trunks 114 is idle at the time this call is made and that the allotter switch 143 is standing in a position to allot this trunk as shown in the drawing. The allotter switch 143 has a position for each of the several trunks which lead out of the line switch 100 to the succeeding district selectors. Consequently the vertical magnet 118 relative to the idle trunk 114 operates and prepares the contacts ofthe vertical row 112. Magnet 118, in operating, completes a circuit from battery through its winding and inner contact, conductor 160, winding of relay 137;

outer right contact of relay 135 to ground. Relay 137, however, being shunted by the circuit above traced does not operate at this time. Magnet 1.18. furthermore, closes a circuit from ground through its outer con tact, conductor 151. winding of the trunk relay 146 to battery.

\Vith relay 146 operated a circuit is completed from battery through the winding of relay139, winding and contact of stepping magnet 138, brush 145, contact of relay 146 to ground over conductor 151. The step ping magnet 138 operates, interrupts its own circuit and advances the brushes 144, 145 and 154 to the next set of terminals. If the following trunk is idle the allotter switch comes to rest, but if it is busy the switch 116 also closes a circuit from ground, I

continues until an idle trunk is found. When the switch leaves the position shown, it opens the shunt around the Winding of relay 137 and this relay operates in series with the magnet 118. Relay 137 opens the.

operating magnet 125 to battery. Magnet 125 operates and effects a connection between the link 107 and the incoming line and also between the link and the outgoing trunk 114. Immediately that this connection is established a circuit is closed from battery through the winding of magnet 125, winding of relay 127, contacts of the switch 100, over the sleeve conductor to ground at the outer contact of magnet 118. The switch is temporarily held by means of this circuit. The relay 127 however, being shunted, does not operate at this time. Another circuit is closed from battery through the winding of cut-off relay 120, conductor 105, through contacts of the switch, over the sleeve conductor to round at the contact of magnet 118. Relay 120 opens the circuit of relay 121, which in turn, opens the original energizing circuit of relay 129.

Should another line in the same vertical group attempt simultaneously to make a call while a subscriber in a succeeding vertical 1 group is calling, his attempt to make such a call will be unsuccessful. When the line relay 121 releases it opens the holding circuit of relay 131, but since a second subscriber of the same group is calling, relay 131 is held energized over a parallel circuit through the left contact of the line relay similar to relay 121. Relay 131 in remain ing energized preserves the locking circuit of relay 128, which prevents the reenergization of relay 129. A second subscriber in the first group, therefore, cannot succeed in making a call until all simultaneous calls in subsequent groups have been handled or until a call has been made in each one of said succeeding groups. In this latter event a series circuit is closed for relay 132 through and relay 127 is energized when magnet 118 ing of relay 613 to battery. Relay 613 operates and locks through its winding and inner left contact, conductor 207 to ground at the outer left contact of relay 201. Relay 613 completes a circuit from ground through its outer right contact, conductor 209, winding of slow-to-release relay 204 to battery. Relay 204 operates and applies holding ground to the conductor 150, whereby magnet 125 and relays 120 and 146 are held energized becomes deenergized. Relay 613 operates similarly to the relay 120 of the line switch and brings the group relays 614, 615 and 616 and the control relays 619, 620, 621, 617, 622

' and 623 into play to bring about the extension of a connection through the sender selector switch 600 to the allotted idle register sender.

With relays 616 and 617 operated a circuit is closed from battery through the winding of the vertical magnet 635, contacts of relays 616 and 617, contact of relay 622, conductor636 to ground. Magnet 635 operates and brings about the energization of relay 612, which in turn, locks in a circuit including the relay 621. Relay 617 also closes a circuit from battery through the winding of vertical magnet 631, brush 627 of allotter 626, contact of slow relay 625, left contact of relay 623, outer right contact of relay 617 to ground over conductor 636. The magnet 631 operates and closes a locking circuit through its windl ing and contact and the winding of relay 623, the latter relay, however, remaining deenergized due to the shunt around its winding. Magnet 631 also closes a circuit from ground through its outer contact, conductor 638, through the brush 628, contact and winding of magnet 624, winding of relay 625 to battery and ground. Magnet 624 steps the switch 626 forward to the set of terminals representing the next idle sender and in a so doing removes the shunt around the winding of relay 623. Relay 623 opens the circuit of slow relay 622 which commences to release.

During the interval relay 622 is deenergizing a circuit is closed from ground over conductor 636, inner right front contact of relay 623, right contact of relay 621, left front contact of relay 612, front contact of relay 611, assuming the link 608 to be busy, back contact of relay 609, winding of the horizontal magnet 610 to battery. Magnet 610 operates the switch and connects the incoming trunk conductors through the link 607 to the group of conductors 632 leading to the selected idle sender. Immediately that the connection is established a circuit is closed from battery through the winding of relay 201, conductor 210, through contacts of the switch, conductor 638 to ground at the contact of the magnet 631.

Relay 201 operates and opens the circuit of relay 613 which causes the deenergization of relays 612 and 619, provided no other sender is being sought through the same vertical group. Relay 201 also closes a holding circuit for the relay 204 which maintalns a holding ground on the conductor 150. Furthermore, relay 201 connects the tip and ring conductors of the trunk through the sender selector switch to the impulse relay 7 00 of the sender. This results in the closure of a circuit from battery through the resistance 718, winding of relay 700, outer left contact of relay 703, conductor 640, through the sender selector 600 to conductor 641, outer right contact of relay 201, conductor 149, thence through the line switch 100 and the subscribers substation and returning over the other side of the line to conductor 148, to the inner right contact of relay 201, conductor 642, through the sender selector 600, conductor 643, inner left contact of relay 703, righthand winding of the balancing coil 701 to ground. Relay 700 operates and closes a circuit for the slow-to-release relay 702. Relay 702 places ground on the holding conductor 720. This ground potential is transmitted by way of conductor 638 and results in a holding circuit for the magnet 610 and relays 609 and 201 in substitution of the circuit temporarily maintained by the vertical operating magnet 631.

Following the series of operations just related, slow relays 136 and 622 become deenergized. Relay 136 opens the circuits of re lays 130 and 135. Relay 130 opens the circuit of vertical magnet 116 and relay 135 opens the holding circuit of magnet 118 and relay 137. Magnet 116 causes the release of relays 134 and 122. Relay 122 removes the shunt and lets relay 127 operate. \Vith the magnets deenergized the connection is now held through the line switch 100 due to the maintained energization of the magnet 125 which as above mentioned is held in a circuit closed to ground over the sleeve conductor 150.

Relay 622 in releasing similarly brings about a release of corresponding elements in the sender selector switch 600 and the connection through the sender selector is held by the magnet 610, the circuit of which is controlled by the slow relay 702 in the sender.

The apparatus is now in condition for receiving the first series of impulses. It will be recalled that the designation of the wanted line is A B 1 2 3 4. The letters A and B are abbreviations of the exchange name and represent two series of impulses which precede the numerical impulses. The letter A may represent two impulses and the letter 13 three impulses. The calling subscriber, consequently, manipulates his impulse transmitter 163 to send a series of two impulses.

At the time relay T02 operates it closes

Images