US2129011A - Telephone system - Google Patents

Description

Sept. 6', 1938.

F. 'R. LAMBERTY TELEPHONE SY-STEM Filed Sept. 9', 1936 18 Sheets-Sheet l INVENTOR F R. LAMBERT) 6R 9 at m at Q at 3 9 1 at 2 at 1 2st 59m 5 at S at mi 2 at m 6E 61 A 7'TORNEV Sept. 6, 1938.

, F. LAMBERTY TELEPHONE SYSTEM Filed Sept. 9-, 1956 18 Sheets-Sheet 2 E kumzzou it Q a T it a I lNVE/VTOR E R. LAMBERT) WN 14 TTQR/VEV Sept. 6, 1938. F. R. LAMBE'RTY 2,129,011

TELEPHONE SYSTEM Filed Sept. 9,- 1956 1a sheets-sheet s OFF/CE SWITCH Fla. 4

PRIMARY TRUNK SWITCH INVENTOR E R. LAMBERT) B -WW Q ATTORNEY Sept. 6, 1938.

-F. R. LAMBERTY TELEPHONE SYSTEM l8 Sheets-Sheet 4 Filed Sept. 9, 1936 m Rik Rub KEDU QSW GEN INI/ENTOR By FRLAMBERTV WWM A T TORNE'V F/RST SUPERV/SORV CONTROL CIRCUIT Sept; 1938. I F. R. LAMBERTY 2,129,011

TELEPHONE SYSTEM Filed Sept. 9, 1936 18 Sheets-Sheet 5 INVENTOR E R.LAMBER TV ATTORNEY TELEPHONE SYSTEM Filed Sept. 9, 1936 18 Sheets -Sheet 6 S TOR/N6 RELAYS FOR RING/N6 DIG/7' SUPERI/ISORK IN 5 N 70k FR. LAMBERT) Sept. 6, 1938. F. R. LAMBERTY- 2,129,011

TEPEPHONE SYSTEM Filed Sept. 9, 1936 18 Sheets-Sheet 7 )QECORDER INVEN TOR E R. L AMBERTV A TT'FORNEV Sept. 6, 1938. F. R. LAMBERTY 2,129,011

TELEPHONE SYSTEM I Filed Sept. 9, 1956 1a Sheet s-Sheet 8 RECORDER INVENTOR U U I FR. LAMBERT) A 7' TORNEV Sept. 6, 1938. F. R. LAM-BERTY 2,129,011

TELEPHONE SYSTEM Filed Sept. 9, 1956 18 Sheets-Sheet 9 Q u Q Q E Q:

INVENTOR f. R. LAMBERTV ,4 TTORNE V Sept. 6, 1938.

S TOR/N6 REL/l VS HUNDREDS DIG! T F. R. LAMBERTY TELEPHONE SYSTEM Filed Sept. 9, 1936 STORING RELAYS TENS .D/

18 Sheets-Sheet 10 Byway F R. LAMBERT) ATTORNEY Sept. 6, 1938. F. R. LAMBERTY TELEPHONE SYSTEM Filed Sept. 9, 1936 18 Sheets-Sheet 1 1 INVENTOR FR. LAMBERT) AITORNEV Sept. 6, 1938. F. R. LAMBTERITY 9 9 TELEPHONE SYSTEM Filed Sept. 9, 1936 1 1s Sheets-Sheet 12 RR. ALLOTTER i //v|/5/v R F R. LAMBERT) A T TOR/V5) FIG. /3

Sept. 6, 1938.

F. R. LAMBERTY TELEPHONE SYSTEM Filed septa 9, 1936 18 Sheets-Sheet 13 P P P P P P lNVE/VTOR F R. LAMBERT) BV ATTORNEY Sept. 6, 1938. F. R. LAMBERTY Y 2,129,011

a TELEPHONE SYSTEM' Fiied Sept. 9, 1936 18 Sheets-Sheet 14 H6 5 CONTROL CIRCUIT /NVE)V7OR I ERLAMBERTV 47 70 IVEV Sept. 6, 1938. F. R. LAMBERTY Y 2,129,011

TELEPHONE SYSTEM Filed Sept. 9, 1936 l8 Sheets-Sheet l5 7Nl/EA/TOR F R. LAMBERTV WWW ATTORNEY -.Sept. 6, 1938. F. R. LAMBERTY ,9 1

TELEPHONE SYSTEM F iled Sept. 9, 1936 18 Sheets-Sheet 1e nvvz/vra/a F R- LAMBERT) ATTORNEY Sept. 6, 1938. F. R. LAMBERTY 2,129,011

TELEP-HONE SYSTEM Filed Sept. 9, 1936 18 Sheets-Sheet 17 CIRCUIT IST RECORDER CCT- INVENTOR E. R. LAMBERTV A TTORNEY Sept. 6, 1938. F. R. LAMBERTY 2,129,011

TELEPHONE SYSTEM Filed Sept. 9, 1956 18 Sheets-Sheet l3 TRUHKS 10 EACH EXCHANGE ONE PER RECORDER AND TRUNKS INVENTOR F R. LAMBERT) FIG. [9

A 7'TORN V Patented Sept. 6, 1938 UNITED STATES PATENT OFFIQE TELEPHONE SYSTEM Application September 9, 1936, Serial No. 99,919

Claims.

This invention relates to telephone systems and particularly to small capacity systems.

An object of the invention is to provide improved and economically arranged small auto- 5 matic system using cross-bar switches for establishing connections between subscribers lines and between subscribers lines and trunks.

Heretofore systems have been provided for establishing connections between subscribers lines and trunks over links in a single switch, as shown, for example, by the patent to Hinrichsen 1,567,265 of December 29, 1925, and patent to Goodrum 1,515,674 of November 18, 1924. In the copen-ding application of Bowne et al., Ser. No.

' 5 95,530, filed August 12, 1936, now Patent 2,104,449 of January 4, 1938, a system has been shown in which connections may be established between subscribers lines over a switch and between trunks over another switch.

20 A feature of the present invention is an arrangement in which the connection between subscribers lines may be established through one switch over links, in which connections from subscribers lines to trunks may be established over the same type of. links to another switch, and in which connections from trunks through subscribers lines may be established over the same type of links through said other switch.

Another feature of this invention is an arrangement whereby connections between subscribers lines may be established over links and 'a control circuit through one switch, whereby connections may be established from subscribers lines to trunks over the same type of links 5 through another switch with the temporary aid of a control circuit, and whereby connections may be established from trunks to subscribers lines over the same type of links through said other switch with the temporary aid of a con- 10 trol circuit.

This invention has been illustrated in the accompanying drawings in which the circuits for a small dial office have been shown embodying the features of the present invention.

45 Fig. 1 shows the arrangement of the figures for the reading of the circuits;

Fig. 2 shows in diagrammatic form the general layout of the switches and circuits;

Figs. 3 to 10 show details of the circuits of the 50 system;

Figs. 3, 4 and 5 show the cross-bar switches employed by two subscribers lines, two supervisory control circuits and two trunks circuits terminating in these switches;

.55 Figs. 6 and 7 show circuits in detail of one supervisory control circuit;

Figs. 8 to 11 show the circuits of one recorder for recording called numbers;

Fig. 12 shows the details of one of the trunk 1.60 circuits;

Fig. 13 shows an allotter circuit for the supervisory control circuit and the recorders;

Fig. 14 shows a recorder-connector cross-bar switch for connecting the recorder to the allotted supervisory control circuit when a call is made;

While Figs. 15 to 19 show a common control circuit relay and circuit arrangement employed in establishing of connections.

Referring now to Fig. 2 the circuits may be arranged with the following switches: primary line switches PLS for connecting the subscribers lines to line link LL; secondary line switches SLS for connecting supervisory control circuits such as SCC1, SCCz and S003 shown to line links LL; secondary trunk switches STS for connecting trunks to line links LL; (Three trunks have been shown) primary trunk switches PTS for connecting the trunks to supervisory control circuits; oifice switches OS for connecting trunks together in tandem connections; recorder-connector switches RC for connecting recorders R1 to Re, to supervisory control circuits during the establishing of connections.

Four types of connections may be made through these switches; calls from one subscribers line to another, calls from a line to a trunk, calls incoming from a trunk to a subscribers line, and tandem calls from one trunk to another.

A call may be made from a subscribers line A by the removal of the receiver from the switchhook, through a primary line switch PLS at a cross connecting point 209 to a first line link LL to one branch, of a first supervisory control circuit SCC1 at a cross-connecting point 26!. A recorder such as R1 is normally allotted so that when this connection at point 2M is made a connection is made to this recorder through the recorder-connector switch RC from the seized supervisory control circuit. A subscriber then dials the desired number and when the number has been recorded in the recorder a selection is made in the secondary line switch SLS to connect the outgoing branch of the supervisory control circuit SCC1 through a cross-connecting point such as 293 to another line link LL and to a called subscriber B through the primary line switch PLS at a cross-connecting point such as 206. The recorder is then released and the connection completed from subscriber A to subscriber B through the supervisory control circuit SCC]. over the four connecting points 200 to 204.

If a connection is to be made from a line to a trunk, the subscriber at A, for example, establishes a connection through cross-connecting points 2% and 291 to an idle supervisory control circuit and a recorder and dials the number of the desired exchange in which the trunk is located. Then connections are established over the same line link LL in the secondary trunk switch STC, for example, at cross-connecting point 206 to an idle trunk 201 outgoing to a distant exchange. When this connection is made the supervisory control circuit connected at cross-connecting point 20I is released and by the release of the secondary line switch SLS so that the connection from subscriber A to trunk 201 now extends over the line link LL through the two connecting points 200 and 206.

If a connection is to be made from a trunk to a line for example, from trunk 201 to the subscriber at A, the trunk 201 is connected through the primary trunk switch PTS to a supervisory control circuit such as $001 at the cross-connecting point 209. The number is then dialed over this trunk through the allotted recorder such as R1 and a connection is made over the outgoing branch of the supervisory control circuit 8001 at the cross-connecting point 203 for example in the secondary line switch SLS to connect with an idle line link LL having access 'to the called line. Connections are then made at a cross-connecting point 204 in the primary line switch PLS to the subscriber at B from line link LL and at a cross-connecting point 2I0 in the secondary trunk switch STS between the calling trunk and the line link LL. The supervisory control circuit SCCi is released by the release of the secondary line switch SLS and the primary trunk switch PTS at the points 203 and 209 as soon as the called subscriber answers the ringing and the talking connection is maintained over points 204 and 2I0.

If a tandem trunk connection is to be made, for example from the trunk 201 to trunk M I, trunk 201 seizes a supervisory control circuit and is connected thereto at the point 209 in the primary trunk switch PTS and the desired trunk connec tion is then dialed. A connection is thereby made over the supervisory control circuit to establish connections in the 001cc switch OS to connect the incoming calling trunk 201 with a called trunk 2II over a link in the ofiice switch as for example the cross-connecting points 2I2 and 2I3 over the link 2I4. When these connections are established the supervisory control circuit is released by the release of the primary trunk switch PTS. To establish a connection from a recorder to a supervisory control circuit, connections are made at a number of cross-connecting points as the number of leads between the recorder and the supervisory control circuit is quite numerous and it will be noted that in the recorder-connector circuit shown in Fig. 14, there are eighteen leads for each recorder. This requires three connecting points for each recorder to a supervisory control circuit such as the points 2 I5, 2| 6 and 211 from the recorder R1 through the supervisory control circuit SCC1, with six leads connected up at each point, each group of six leads is symbolized by a single vertical line through the crossbar switch.

Descriptions of these various calls will now be made in connection with Figs. 3 to 19.

It is now assumed that a call is made from the substation A to substation B. The subscriber at station A will lift his receiver from the switchhook and thus cause an idle supervisory control circuit, an idle line link, and a recorder to be seized and connected to the calling line. When a calling line is connected over a line link to a supervisory control circuit, a dial tone is sent for the dialing. The lifting of the receiver from the switchhook by the subscriber at A closes a circuit for the operation of relay 300, from battery through the right-hand winding of this relay, contacts of the holding magnet 30I over the subscribers loop through the left-hand winding of relay 300, contacts of relay 30I to ground. This relay in operating closes a connection to ground for the GRP and LT leads. The ground on the GRP lead closes a circuit for the operation of relay I800 in the control circuit. This relay is associated with the subscribers group of ten lines in which the calling line A is located and the circuits of this relay may be traced from battery, contacts of relays I80I, I802, I803 and I804, windings of relay I800, contacts of relay I805 over the GRP lead to ground at relay 300 over contacts of relay 302. It will be noted that a set of relays such as I600, and I805 are provided for each group of ten lines, relays I800 and I805 being provided for the first group of ten lines. Similar relays such as I806 and I801 are provided for each group of ten trunks. It should be understood that similar relays are provided for other groups of ten lines and ten trunks. For the sake of simplicity no other similar relays have been shown in the circuit. In the same manner relays such as I MI and IBM are provided for each recorder. These two relays are provided for the sixth recorder and relays I802 and I8 are provided for the first recorder. When relay I 800 operates a circuit is closed for the operation of relay I805 from battery through the windings of this relay, contacts of relay I800 through corre sponding contacts of unoperated relays, not shown, between relays I800, and I805 through contacts of relays I806, I803, I804 to ground at relay I100. Relay I800 locks to battery through its own armatures and front contacts, contacts of relay I805 to ground at release relay I102 independent of the ground on the GRP lead. Re-

lay I800 disconnects battery and ground from the armatures and contacts of the corresponding relays for other groups of ten lines so that relays of higher numbered groups and lower numbered groups of ten lines cannot be operated. Therefore but one relay such as I805 can operate at a time. Relay I805 closes a circuit for relays I900 and I600 in series over a circuit from battery through the winding of relay I600, winding of relay I900, contacts of relay I805 to ground. There is provided one of each of these relays I900, I600, I602, I603 and I604 hereinafter mentioned for each line group. Relay I805 also connects leads 4 and 5 to the allotter circuit in Fig. 13 for the operation of the start relay II from battery through the windings of relay I10I, contacts of relays I100, I805, I300 to ground at contacts of relay I30I. Relay I10I provides a locking circuit for itself through its windings and contacts of relay I100 to ground at contacts of relay I10I. The operation of relay I600 closes an obvious circuit for relay I602 and also a circuit for relay I603 from battery through the winding of this relay, contacts of relays I604, I600 and I500 to ground. Of these relays I600, I602 and I603 associated with the group of line switches in which the calling line appears, relay I603 connects battery to the sleeves of the ten line links LL, and LLI and others not shown in this group and causes the operation of relays IBM and I502 which represent the first and the last links in this group of ten, and other intermediate relays omitted. Now any line link that is busy will have a ground on its sleeve from the supervisory control circuit and such of the relays as I50I or I502 which are connected to this sleeve will not oper-

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