BE353777A - - Google Patents

Description

       

   <Desc / Clms Page number 1>
 



  IMPROVEMENTS TO AUTOMATIC TELEPHONE SYSTEMS OR
SEMI-AUTOMATIC.



   This invention relates to telephone systems for central offices using. automatic switching devices for establishing connections between subscriber lines. More particularly, the invention relates to a network comprising one or more desks including two-way selector switches of the Strowger type, and one or more desks containing single-motion switches controlled by common control circuits. Its purpose is to provide means for interconnecting these offices using two different types of selectors.



   In practice, in offices equipped with switches of the Strowger type, the junction lines occupied are indicated, on the rows of the panels of these selectors, by an earthed potential on the test terminals, while the free junction lines are characterized by the absence of any potential on their test terminals.

   On the other hand in offices equipped with
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 medium TF1t1¯electectors controlled by common circuits Il'1I '/ d:' \ f1 \ / ï, l} J .'... liHrr

 <Desc / Clms Page number 2>

 
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 de cont): è5J.p which serve a series of selectors, it is néc8ni = 8iz'C c? ' e,;, y.l c, yer In test method for junct line search, io: r .l.i.1> .r. = v, known as "battery test". this method r. (distinguished by the use of batteries connected to bo> - & nes c? 'e; -r -. ^ to indicate free lines tf!? x) is that the. land is relice r'u ". ' test horns from the occupied lines; the removal of the battery potential from the test circuit serves to cause the
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 are serious.

   So to transmit a call from an office using
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 8 {lcct0nl '; i, sirnple reouverrient, commanded by common control circuits lp., to an office using selectors of the Strowrer type, it is necessary: It is necessary to read to foresee ii the offset end of the ii; junction ne z eli, tut 1 (> 8 bUrCI), 11X a group of oela.is which apply a bntterie potential 11 1 <> test terminal qua.nd>. junction book between Hbre and which connect the, earth to this terminal of esso i pussi lorrrae, n, r, that this icon in '!', used.



  1; deo 1> .its cnra.ctérintiques of the invention consists of J. ' st.pbl1nG (! 'slow of U1 relay crank to be used at the <20'.f1rt end of a junction line extending from an offset selector 1.1. s; .ir, ple movement cor; -: ') 1 {le Pf',) 'un cornntttratettr T! 1flrqu (' UJ 'common and <> i.iÎ.ī *? iit an ensai of 1>; nt.èi "ie, and rboutisnant to a nelectric of '' 3.! ivéc of the type ;; three '.' C / T.

   This group of relays is provided with ç '(' rVP11t. I \ fllipli (lucrative the potential of bf1tterie to the terminal "8 of you ppi of 1 .. ii.rr ^ junction when it is free, and at eloip1or the said b ': 1 <ce>, jic of this terminals succeeded as long as the line is used
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 -
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 dry. i, \ ÜVR, nt 'lrJ putre 1 = .11: characteristic of the invention, a repeater used at the offsetting ea2érllr.té of a junction line with two conductors connecting t i>. ;

   ib firing with single-motion selectors controlled p1: .r common control circuits with a desk 13.; .1, E1 <; cteuz.s of the type:; trov7c'er, this repeater being provided with Rorvant ar , transfer control of the connection ret # .ôiisseinent of the calling subscriber to (me operator, when a call is extended through the trunk line to an operator position of the office with switches type Strm7 [:

  er.

 <Desc / Clms Page number 3>

 luis that the junction lines extending from the office with switches of the Strowger type to the office with single movement switches, terminate, at their incoming ends, in incoming switches, one group of which is served by a common control circuit, it is necessary to mark all the junction lines of an unavailable rump as long as a group selector is in operating relation with the common control circuit. Since these junction lines are accessible to Strowger type switches, this occupancy condition must be indicated by an earth potential on the test terminal.

   According to another fact, the invention provides a group of repeater relays to serve at the outgoing end of a two-wire junction line from the panel of a Strowger type selector, to an incoming selector. simple movement and controlled by a common control circuit to a group of similar selectors. This group of repeater relays includes means for marking the junction line not available when the common control circuit is in an operating relationship with another arrival selector.



   According to one of the preferred embodiments of the invention, this object is achieved by a repeater guard relay which responds to a return power supply by the earth coming from the common control circuit through the negative conductor of the repeater. all free junction league @ of the group. This earth is applied to the common control circuit by a relay which is energized by a line relay, which responds to the closing of a pulse circuit across the trunk line.

   To avoid an uncarded time interval, provision has been made that between the moment a trunk line is chosen and this return feed ground is connected to the other trunk lines of the group, the temporary power supply by earth on the test conductor of the Strowger type group selector passes through a conductor common to the test terminals, at the outgoing ends of the free junction lines, so as to 2.mark these as not available until

 <Desc / Clms Page number 4>

 
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 the e.li! nerr-1i ..

   Lon in return by earth through the ne- [-p.1.ifs do Ouro incoming ends, energizes a gvrde relay in the napétcurs relay fnupe at their deposit ends. l :(; f] feits lPre.ctérist: 1. that, as well as other non-special items mentioned herein, are better understood from the description following on the accompanying drawings. These, which represent typical embodiments of the invention, include: fir..1, a connection circuit with counter relays;

   Figures 2 and 28., a group selector of type 11. simple movement equipped with fi '[(' 0 two sets of bp.ln.is + A, -A, TA and + B, -: 3, TB, two bn lm is Aourl-J10rÚ18.UX îvl, ld2, and two bnlais control CA, CB, the terminals of b - 'no of this switch being connected to the terminals of a bank SC2 of 1111 switch! f1.rqurnr SC which is nia in motion by the i, npllr;, i.ol1fJ IIJ'or) ll..1tes 1 "" 1 'the nurnenotor disk, and which is used to .arquer t, fls contncts of the crWimut ("1teur principal, this commute.teur, marker and pon group fie relay 1H1! to a rérie de fcloctnnrn de rroures; îir'l.lxe 3, un (Troupe of repeater relays c (nptée to be inserted d:, JlO the starting end of a two-wire junction line s' eteiid = - nl;

   between an office using CO, MI1'Jt! "tel1) - '" simple rllOUv8 ::, have and an office using lo; n = 1atateux'8 du' ty'c f3t.l'owr: cr; figure 4, an arrival selector -m and nJl connoctcj- il youne:; t, ^ 0rEE '".', as well as an operator position 11: -> r" .l. ,,! .lr 'Ii, Ii' neiector of pyoupc and the connector is not> '1t rra! ror1i.léf t1! ; 1 "lP.ll since their3 circuits and the functioningcurclnCf'1Crtte will be well counup; figure 5, a circuit for relay cornpteurc and a neleuteur,; 0 groups El type Stro ;; jer, indicated only by a le8tron :: le; ficuro 6, a (, '1.'OLtM7C of reinis repeaters pdpptés p0P1' i> ù7? Ln8frf1 \ e; 1romit <Ù of a two-wire Junction line is off: ldf1ilt between a switch office type ntrowger and a (: 'ntre buren.u using single movement c ü'lrLUta tcars;

   Figures 7 and 7a, a selrci: eur arrival, -similar to, that of Figure 2, ln. part entered below the dotted line represents the control switch COr.1'11Un and the relay group; figures 8 and

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 8a, a single movement final selector equipped with +, -, T line and test brushes and a control brush, 'group terminals, on the latter's panel, being connected to a TCl panel of' a TC tens marker switch, while unit terminals are connected to the UCl panel of a UC unit marker switch, these switches being set by the pulses of the tens and units digits at the same time 'a group of associated relays is multiplied to a series of connectors.

   Figure 9 shows how Figures 1 to 4 should be placed to follow the description of a connection made between a provided desk (the single motion selectors and a desk fitted with Strowger type selectors, while figure 10 shows how the Figures 2-2a-5-6-7-7a-8 and 8a must be placed for the description of the connections between a desk with Strow ger type switches and a desk with single movement switches.



   Description of the circuits: We first consider the case of a call originating from a dependent subscriber of an office with single movement switches of the stepping type and controlled by common control switches, this call relating to a dependent subscriber. an office using Strowger type switches. When the subscriber calls marks the call, his line is extended by means of a pre-selector arrangement of a known type, through a counter relay connection circuit indicated in fig.l, to the primary group selector. shown in fig. 2 and 2a.

   The group selector circuit can only be chosen when it is in its rest position for which none of its relays are energized, and since it depends on a common control circuit, it is also impossible to select it unless that the control circuit with which it is associated is not as free with its marker switch in its normal position. The circuit for connecting the primary selector and the control switch passes through the earth of the preselector circuit, the test conductor T, contact 2 of relay HA, at rest, contact 2 of relay HB at rest, the brush and the contact of

 <Desc / Clms Page number 6>

 
 EMI6.1
 rest of j, ;; m <; 1.u Td2, relays it Here, contact 1 of relay 2 of the control circuit, contact 4 of relay 3 PU rest, the coil is not ln (] ueU f of relay 2 , and 1 battery.

   There is another path in pn: cal1è. The worm is winding it non-inductive of relay 2, short-circuiting 1 (. Contacts of relays 2 and 4. Relays K and 2 operate, the latter 0Ll .vrrnt 8. Gan contpct 1, the circuit proceed, from f1 ')} Ür, rc that I 1 Wlt, control tor will find there. occupancy condition for '. have other p1.esia-t; t1r,: Relay 1': completes a circuit for a'r.:.: j. pulse 1: battery, contact 2 of relay 9, relay 1, contact 3 of relay Il e-ccité, contacts 4 of relays MA and lin ncut ':; "1J.i.:0f1..:.:onclucer rm .wtif of the eb o nnô circuit, return pu 'le cv>, "i> <t. e = im. positive, contr'ctf! 3 of relf-is HB and HA nc u l ..> m 1! sos, and '1: 0)') '0. Jp relay 1 si'c :: <; 1, t, e and feme nrpl1'ct \ 1 t for re- .La.iA 4.

   There 1C1J'lC ruufii a circuit for relay 3: battery, nelais 3, contact 3 of relay 1 e; c: lté, contact 5 of relay 4 energized, terminal of 1;?: O> and b ['lai of the 1.'1 ') V> C Sil, and earth.



  Q'u'nd the subscriber, cos: wnence 4 maneuver pon disk to mprquer the rr) integer digit, the j.eir'.in at impulnioun 1 iéj, ond at each opening (lU circuit, co.rnplata.:r each time a circuit for the éJ.e; tro-oi, rir .. D1 'du com'11utr: .cLl1'. ';' 1nry, ueur: battery, eleotro-magnet 1) t, cont, rut 2 du relay 1 ncüt.l'f11ioé, count. and 1 rlu relay 3 energized, contact 4 '"" 1 rcipis 4 energized, and earth. > Relay 3 is reestablished S., ', <2Iit Je-t ,,. and q <t-'l rd the marker switch leaves its position of: r'OT0f', ro'Jll circuit is nnintenu cl1F1.qne times the relay to it., -
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 .
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  Jilll ± 'I. > in "comes to rest, and this through contact 3 of i; 1¯, iig 1" 1 't ut. ii = L .ir <F, contact 1 of relay 3 energized, contact 4 of relay 4 C 'JL <fi, and earth,: lJ.;: 1nd the switch plnrqueur leaves its idle position, a circuit;] t completed for the electro-a, imf1nt engine there from 86.Lc (: tcu):

   battery, motor electromagnet R, rec-crt 1nterrupt8u.r of this L <Ù le c t> :. o - r 1: nr nt, contacts 1 of relays HA and H13 nox'.rmux, contact 4 of relay K e;: cited, contacts 1 of relays 9 and 8 normr11..1x, contacts out of norm of bank SC1, broom and dirt. SC2 brush of conmut3tonr rnn.rf2ltou.r znenerates a circuit for the relay

 <Desc / Clms Page number 7>

 
8 through the selector bank and bank, so that the relay 8 can operate if the selector reaches a position corresponding to that parked by the marker switch SC. If this condition occurs, relay 8 is energized: battery, relay 8, contact 5 of relay K energized, brush and contact of bank CA or CB, contact and brush of SC2, and earth.

   Relay 8, when energized, opens the motor circuit of the electromagnet R at contact 1 of relay 8.



   When the? pulses cease, the circuit of relay 3 is permanently open, and after a certain time this relay 3 is neutralized, closes an alternating circuit for the electromagnet of the selector through contact 2 of relay 3. L The electromagnet therefore continues to trip regardless of the condition of relay 8.

   As soon as the selector has reached the group corresponding to the one marked and registered in the marker switch, relay 8 is energized as has already been described, and with relay 8 energized and relay 3 neutralized, the. test circuit is complete: earth, contact 3 of relay 3 normal, contact 2 of relay 8 energized, brush and contact of benc SC3 of the marker switch, then either contact 6 of relay K, a winding of relay HA, and the test brush TA, or either contact 7 of relay K, a coil of relay HB, and test brush TB. This distinction is made by means of the pooling of the contacts of the bench associated with the brush SC3.

   Some of the contacts are associated with the marked brushes A, while the remaining contacts are associated with the brushes marked B. The marked fre ckif having been recorded on the marker switch, determines which is the HA test relay. or HB which receives the test potential. The HA or HB relays only operate if they find a battery through a low resistance, and the selector continues to advance until its test brush finds this condition.

   If a free line is found in the required group, the HA or HB relay operates, connecting the conductors, negative and positive, to contacts 4 and 3 respectively, connecting the test conductor to contact 2, and completing to contact 1 a blocking circuit

 <Desc / Clms Page number 8>

 
 EMI8.1
 in r, e for J ,,,., relay d'esnai. When the c ond ucteuzw, hegative and positive, are connected to the contacts, the circuit for the relay to imrJul- 8ion8 1 ('s', open and this relay interrupts the circuit, of relay 4.



  The latter (. [\ Tt slow recovery, now had contact 2 a ground âLl2 '¯LU' test lead through contact 1 of relay L actuated Until this relay is neutralized. However, relay IC is kept energized through contact 5 of relay 4, contact 3 of) celais K, inductive flow of relay 2, and 19. dry battery. (I} "J1 (relay 4 is neutralized, this blocking circuit for the kidney if; J, nf1t 'open, and this last relay [JbJl (: o: lI1e ses ar7ls.tLU' Il ce morn ::! 1 ., an earth potential ent pinched on the conductor of es spi ppr the co ,,,,, ttt.teur f1uivF1nt.

   POl 'sP neutr.rl.liration, relay 4 completes 1. \' reestablishment circuit of marker coim-1iJtP.t.t., at l.:I:'DVe1'8 1st contacts 2 and 5 of standard relay 1, In contact with the switches, in contact C> of relay 4 norlha l, towards the b8nc S "Jl in posi .lion n01'1,1'1 L0, and its bnlai which is connected to the earth. During this onér ^ fiinn, .1..0 relay 3 input: 1 <7 1 iit a im excited by the same circuit, and nu ccmt, r,; t 4 of relay 3. The input circuit is Maintained open for 0r.1l; 0C : I \ 'J.' the corwr¯tto.tear do controls to be chosen.



  ; '11 there r1 r'ncunc li'ne free, in the required group, the f: lc; cte, .rr CfIJ11; im1.e to move forward Until it reaches its rest position or .The following circuit will be closed: battery, relay 8, contact 5 of: c;: 'city, brush and AC contact, relay 9, contact 5 of 3 110) "1" 111'11,! Phnr 6 of 4 energized, contact of. - and broom 301, and 'ter 7, e, Le J'cJ. ". Î'1 9 gets excited and connects the occupancy auditory signal. it through 1.r, I3T conductor which is supplied by the the calling pbniiné. Relay 9 remains energized, maintaining the busy Ci ['; 11.9,1 ensures that the subscriber hangs up his receiver, causing the slow reset of 1 and consequently the re-establishment. of 4 which opens the occupancy relay circuit on contacts 6 and provokes the rpt.n.bJ.i.::SG:1ent of the control switch, as has already been described. .



  Hi..The subscriber does not operate his disc after declining

 <Desc / Clms Page number 9>

 On its receiver, a circuit is closed after a certain time: TP conductor, contact 2 of relay 5 normal, contact 1 of relay 4 energized through the winding of 5, and battery. Relay 5 is of the so-called two-stage type, and it only closes its light contact 1.



   If the marker switch has not moved when the earth is far away, the relay 5 is fully energized through its contact 1, the rest contact and the bank brush 'SC2, and the earth.



   When earth is connected to the TP conductor, relay 7 energizes and closes the following circuit: battery, protective resistor, contact 1 of 7 energized, contact 8 of K energized, HA winding, test brush and contact AT rest; PGK key, and earth. The relay HA, when energized, connects the subscriber lines to the selector reset contacts, thus releasing the control circuit, as has already been described. A circuit is also closed for the PGL call lamp through the rest contact and the TB brush, the contact
5 of HA, the normal contact and the brush to the ground of bank N1.



   Certain rows or benches of the selector are connected to other selector switches of a similar type, and lines connecting them to other desks can from the banks of these selector or selector? following. Each trunk line requires a repeater circuit similar to that shown in fig.3. As has already been described, the selector circuit searches for a free selector or repeater by looking for a battery potential on the test lead. This bnttery potential is shown as connected through the contacts @
1 of the normal MD and E relays, to the test lead T.

   When this connection takes place, the circuit is extended to the negative and positive conductors, causing the operation of relay A: battery, winding of A, contact 2 of relay Dr normal, negative conductor of subscriber circuit, return via the positive conductor, contact 1 of normal DR relay, second winding of relay A, and earth. Relay A closes the following circuit for relay MD: battery, MD winding, normal D contact 2, normal B contact 5, exited A contact 1, and earth.

   The MD relay moves the battery away from the driver.

 <Desc / Clms Page number 10>

 
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 sni and la) 'o': n 1. <> co} Y-1r 'an earth connected to contact L of relay r; l) .. LEjC' l.l'Cl4O.i, for relay L3 is completed as night: battery, e J.:t1s B, cortajt 3 of 1. excited, contact 1 of I norm.!, contact 5 of B normal, contact 1 of A energized, and earth. Relay B connects the test conductor to contact 1 to earth, complete the polarized winding of 1'e1 <1.18 D to contact 2, and prepare the circuit of relay c to contact 4. operation of relay B is made independent of relay I, and contacts 5 and 6 of I3 couple the advance circuit 3.through relays I and D and the line
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 of Junction.

   As the subscriber operates his disc, each together
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 repeated crt pulses IJr) x relay A which opens the forward circuit on contact 2. At the gl? ei,; 1?: re train check pulse, the circuit is t .t'crnied for the relay. J: battery, relay C, contact 4 of I3 energized, and contact 1 of A nornal. Relay G short-circuits relay lj6t t..l. relay l to improve pulse conditions.



  The nu'tre e: ': r.cw! Ity of 1c 1, ig; i: e of junction ends on a selector of rrC> 1.') 0G E with double movement of the type stereo '\ 7 [" e1 "(fi.4).



  .ucr, transmitted impalsiorm.T from the repeater cause der displacement; 1 ,,. L .-, is to a free trunk line in the required group qt <1 "Cli8 the subscriber calling there a final selector H, which C" i himself- "10I'1 ') motivated to close the lirne required under the influence of iro! uz is; J 7ns tens and ones, and this in the correct way COj]] l \ 'n.', 'FPld the called subscriber answers, the final selector reverses the (ijj '.> "i. ln of the current (\ [\ 118 the meaning of the calling subscriber, c qui;:;:. ú70 (j', tr '.1, .., - operation of relay D fig .3.

   The circuit for 1'c; 1. "'Ü3 il = open f1, U cojitiot 2 of relay D, and this relay is neutral read,'" 1> circuit being completed for relay Dii through the cent "'and: 2 of LtJ7 normal, and 1o contact 1 of I) energized. 1e functionJ] 0'I'nnt de Dil reverses the direction of the current in the circuit of the subscriber ^ -pelarzt, Fi ovoq, 1J, ! nt the operation of counter relay 1 ^ R fiC.1. L! c oclUis is blocked li through the test conductor by means of fO; J two winding through contact 3 and connects to contact 1 a ground to conductor II , which brought the function-

 <Desc / Clms Page number 11>

 the counter of the calling subscriber in the ordinary way.

   The contact 2 of MR Fig. 1, short circuits the non-inductive winding and the operating winding of MR in order to reduce the impedance of the conversation circuit. The MD relay fig. 3 is slow recovery, so that some temporary current, which could cause the operation of the relay D, does not cause the operation of the meter, unless this current is sufficiently prolonged to allow the relay MD to free himself.

   If the called subscriber is interrupted, a nuditive signal is received and transmitted by the repeater circuit to the calling subscriber. When the calling subscriber hangs up, relay A in the repeater (fig. 3) returns to its normal position, opening the circuit for relay B which in turn resets. Relay A opens the advance circuit at contact 2 of relay A, and all switches up to the final switch return to idle. The switches between the calling subscriber and the repeater are released when relay B moves the earth away from the test conductor at contact 1.



   The lines of some of the rows of the incoming selector E (: Ci [, -. 4) are connected to operator positions such as B which require the facility to prevent the calling subscriber from releasing the connection. unless you are logged out by the attendant. Calls of this nature are not metered, and therefore there is no reversal of the current direction. battery to repeater circuit. When the arrival selector searches for an attendant circuit, relay L operates through the repeater circuit and completes a circuit for relay LL which turns on a CL lamp at the operator position.

   When the attendant inserts a plug into the J jack associated with this lamp, a circuit is completed for the C0 relay which energizes and opens the relay circuit.
LL causing the Lamp to go out. If the calling subscriber hangs up while the attendant is still connected, repeater relay A is released, in turn opening relay B circuit.



   However, the MD relay is slower to neutralize than the B relay, and when the B relay deactivates, the operating circuit is

 <Desc / Clms Page number 12>

 
 EMI12.1
 farm JJO,: the Î :. relay I. Circuit fcz> me: earth, contact 4 of 1: ï1 energized, contact 3 do B normal, ei ir o ui e;: ien t of I, positive conductor, winding of relay s.%? energized, contact of c É 0 (fiv.4), protective resistor and battery. link relay I operates and maintains'! JD energizes pu contact 1 .., r, relay L:]) also maintains In earth on the error conductor, erY; '' sings the subscriber a.ppe-Lant to be disconnected from the circuit.



  When the operator removes the GO plug, the CO relay does not switch on opening the '...: j.1' <.;!. It of I which n. son!, Where): opens the iD circuit freeing subscriber f '"" 0 J.r !, nt. f) connidere mi? inlve> i;.> nt the case in which a Subscriber é% ppe- 1 '"nt c1 depends on a barcau equipped with keys eOTl1T' switches type Htrowpor sends, 1.11 r 'l)) cl Li 'J.); c ".i) OJ" 1? iC connected to an office using these COt'ifri7.It ^.'. C1, ': 7 t;: it'11-Lt3 i' "10UV8J ' 10Jlt c L 1 <cir (; 1it common of e control.



  ;.; t? r3: "'rbonné picks up Its receiver, it is. connected to a circuit;' J'tf61ccte'u: from a v,:> n.LrG well known through a seo relay in p 1: <;>> a "b?; i3 (f 1 1 ... 5) to a selector 1) ri? -. v ^ .ire '^ 1 which answers pu first digit r: street to disk, and extends the call either to a selector: ec-r ire of the same type or to a repeater f1r; ocié 8, vec 18,, l 1 jj ne de j011'J '.lr) ll su central office using den comminutateurs à siriple .louvoit ,: lf'llf1 le nYf: \ tèr'1G v> '.,' Oi, 1'E'.ï, a busy circuit is cprp.ct- ù "1 <é 'P'1}: nr. potential et 1'- 'earth mu "the esspi conductor, and ri In. Lipjne tio j <>'! Al.in have occupied, or if 18 control circuit [1sLocié rv ('c le r J' .1, ' ; ". 1 'tt .a'a l.Vée; 1' E: ^ jJrs free, there is an earth potential :: 1; X 1. 't ... e of the repeater circuit shown i'iig.5 .



  However pi 1. arrival selector and not contx.êlc switch. r,. <¯oci, (;;,. 1 ;. tihre, there is no tire on the conductor of e; zi and a ciJ'cu'j + r'f't f81 '' '1é : battery, flow of 6DA, contact 2 of 6Da normal, negative conductor, abandoned post, positive conductor, contact 1 of 6Dn normal, t7e,. anxiety erv? oule; aent of GA, and earth.



  The relay (jA adorns the circuit of relay 61.J: battery, relay 6J.ID, contact 2 of 61), contact 3 of GJJ, contact 2 of 6A energized, and earth.



  Relay f, 7: .1) does not energize. When the repeater is chosen, a ground has been placed on the test conductor by the previous selector which is

 <Desc / Clms Page number 13>

   extends a ', .1'1' to contact 1 of 6B and contact -1-of 60 to a common point of which it is connected to similar contacts of all
 EMI13.1
 the other reactors using the same COJ'1. ': the control user at the end of -, ir-vee. When relay 6I, D energizes, earth at contact 1 is given to this common point, so that all repeaters continue to indicate occupied.

   Relay 6A also closes the feedback circuit from the negative conductor through the winding of relays 6D and 61 to the positive conductor, causing the arrival selector to connect directly with its control circuit.



  Subsequently, as will be explained later, the control circuit places a ground on the negative wire of all the free arrival selectors rvcc with which it is associated, causing operation
 EMI13.2
 GC relays in all rertr.zts repeater circuits.

   Consequently, when the fiB relay is energized, pmr following the start of the operation of the numbering disc, the removal of the potential of
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 ground of the common point will not make the remaining repeaters free, M "'is s lc 1 nn these kept by the incoming control circuit. the first series of pulses is repeated through the junction line p1:' r 1-e Gon'tr> ct 1 of relay 6A and, at the first interruption, a circuit er! + closed l. for relay 60: battery, relay 6a, contact 4 of 6B nornri, contrct 4 of 6J * D energized , conta.c, 2 of 6A normal, and tCJ ..- rc..Lc: i '() 1jC ionne 0 ent of relay 6a short-circuits the undue windings' @@ s of relays 6D and 61 to contact 2 of relay 6C.

   At the end of the first interruption, the circuit of 6B is established: battery, relay 6B, contact 4 of 6C energized, contact 2 of 6MD energized, contact? of 6I normal, contact 3 of 6B normal, contact 2 of 6A energized. Relay 6B locks at contact 3 and relay 6MD is held through the same circuit while relay 6C is actuated from earth to contact 2 of 61 energized when relay 60 is normal.

   As has already been described, the operation of relay 6B moves the earth potential away from the contact 1 from the common point. When the arrival selector searches, and the associated control switch is released, the earth potential is moved away from the negative conductor

 <Desc / Clms Page number 14>

 
 EMI14.1
 of Rf le r: 1 f .: 1.1 "of free arrival, causing the reestablishment of relay 60 in each of the corresponding repeater circuits. The: r.étn1JIÜzation of this relay 60 moves the potential away from tc;, - jc C: ' u CC: T7rL: L; j.Et.l.



  (1 '<> sf1 [' i, 7;,. JllF111. This one free for other calls. At the end of lp c ') nVC1'f-: f't LOll, qw'nd the subscriber ap pe lx, iat hangs up, relay 6A Be releases, onV): '11 the circuit c1'c "\' f ', nCCHlCllt. A circuit is mr.1.intellf! Dt closed for 1" GO relay, as well as that p, already been described, which cr.t opened. (! 1 ,,, e) i-id le 1'Ol1'ti6 GI3 GC e i ie i> ti é-. l 1 se, 1.0 J: elnio s 6 C maintains the l) otCjlL1nl (10 terre iiur le en ;; d cteL1r d 'es s'.i pour une rwuve.i.L8 1, h.'5cc: e ^ î; il <1 '# x: i, urez, that the;'. CO''11'mtate1. '. X'r; gero nt released} .1C'nrJE1nt i t.er1! J1 that the>. <<> .lr 1 60 ne e ne ut, i "a. li goes and returns If 1i [nc de jo :: c;": ior, li.l,]. 'c <t' Î <.a " e chosen 11,], ('; (1c, ¯up.th time.

   If the selector <J 'r, ij¯.ivifi <: (the level0' .. tX or the 9 ';! C {CD connected to an oper.Jt position, ii <? Ef:; l "C ^ rlt. 1 "ease of! ,, 'lntic1t for this operator, a potential 1,. j ^' '.. 11C ent pi-ce' 1J.7." the conductor who;. '' will int ';, iJ < > ix.ciii, for ieiaiz GI if relay Gi3 is released, 1 ± 1, ('laj, 8 6l;: r'.in. keeps relay G: .1 ru contact 2 of relay 61 energized.



  Contact 1 of relay 6 j ,. ± pr "; f13,; 'lt-ient In. For the conductor ci'es çni yes 1 e, j,, fi <= ijo i'Fa) Ollîl'G' (the only free itself from 1 "connection 011.



  L ''; .- tr'c.: Ité (1 'f'J:' J. "Iv / c '(ic 1 liyre clc Junction results in' -1ï ^. '1 ^". R .. ", '' '' arrived '; (rif'.7) ct f: g.: aii <1 1 "repeater f'n: c The circuit C.' '' W 'iaJtv., (; tn, an circuit e: ; t fCJ.'nl. '. i1'JU :: le l E.'lc ^ .. 1C1 7K: 1Jf'.;, CZ 1C, con .j¯i> <: t. 2 du r i. "1S 73 1101'1M. .1, contr-ct 5 of 74 J10j.T .- ,, 1, contact no1'l: .l and 1> T 1a, 1 dn i;" r1C lJ2, contact 4 "ce '7K normal, contact' 1 of 7 Iib norT. ". F'1, l: C) il '^'. '4 of 7HA nortT-j., CG; lti (tCt.CC,', r positive, return on .Le conc'u.e1.eur j] ('; "' if, co, li: ^ ct 3 (le 7IL \ uornal, contr'ct 3 of 71 * B normal, J r: à.al:

   7i ', and CJT0. 2I here is 7K r'e blocking through its link ('1: 7.'CLllcrne'1; ,, contact 1 (the 7K energized, contact 5 of 7HB normal, contact 5 of 7IIA nor! H'1.1, control 3 of relay 73 normal, and la. te'r'e.! J'018.i8 7K searches for the closed circuit relels to ht1) ulsions 74! '11 .J. contacts 4 and 3 of "7Ji. The relay 71 energizes and makes a circuit for 74, which causes the func-: iollno, ', ent of 73 of a

 <Desc / Clms Page number 15>

 
 EMI15.1
 Way rc 1: '. Lr-.cle that described for the group selector fig.



  2. Contact 3 of 74 places an earth potential on the contact of all 7K cells which are normal, and this potential is extended.
 EMI15.2
 ai ni 7HA mi 7HP ne; = oyit retains to the negative conductor and on the junction link, as well as that a. already been explained. The blocking circuit .'ORX the rel -, is 7K is held at contact 2 of 74 energized before it is opened at contact 3 of 73.

   The operation of the arrival selector from this point is identical to that of the group selector which has already been described, except that the circuit for relay 75 is slightly modified as there is a danger for the relay 7K to jam indefinitely. if by accident he is pushed
 EMI15.3
 by hand..1E% TP conductor is connected through contact 2 of 75 normal, contact 9 of 7K energized, to winding of 75 and battery. The relay 75 is energized through its light spring 1 only and when the earth of the conductor TP is removed. If the com-
 EMI15.4
 mutator T'1C "} 'QU () ur r.'a j - ,, s takes a step, relay 75 is fully energized at tr'1.VI")' C -on contact 1, as well as contact of rest and the brush of the br ;; c nC2, to the. Earth.

   Relay 77 is energized through the TP conductor if the circuit for relay 75 is held, and the
 EMI15.5
 râlais 77 ferrite the circuit of 7iA which is connected through the brushes + A, -P ,, TA bare contact of rest. The rest contact of negative brush A is earthed, so that if the closed circuit is
 EMI15.6
 broken, 1 "tc ,, c: will cause relay 60 to be energized in the repeater, preventing the trunk line from being used until the incoming selector has returned to normal. The arrival selector can extend the call to a selector of a different group similar to that shown in fig. 2, or direct the call to a selector.
 EMI15.7
 final seal3able to that shown in fig. 8.



   The:, final voter can only be eaisi if all of its relays are at rest and if the control switch with which it is associated is free. This condition is characterized by a battery potential on the test lead.

   Before searching

 <Desc / Clms Page number 16>

 
 EMI16.1
 towards s 1 r; sr¯r ;; tsour final, the selector of groupor, pi "ce a potential of te.rrn ,, 111. ' the ccnai conductor which is extended through the? COJlt? c1-rJ 3 of 3D and (the in normal, the two windings of 8K in ft'x'nl1èlC ', the contact 1 of 82 normal, the cuntc: t and the broom of 1 ::. nc T02 the Li,!; U, 1!. 't. ^' t: CU.u: of control don tens TC, the normal contact and I 1) "1 [> i of bank 1.; 0 :; of the units control switch (JC, the bottom winding of F32, and the battery. This causes the SE and 82 relays to operate. The closed circuit is proIcnpe to the AC rinser in the final reviewer which activates the iiT3 revis. The c: ce:,;: t, 1 (the latter rJl0ce an earth potential on. The COI! C \ uci, e'11 'of onipi v. In order to prevent the selector from being entered by a ri # lr <: co r: iLrat.eur.

   When the pulses cOI! 1f "start, the. Ground is piolonfoe r. L", r81'G the J. contact of normal OA, the contact 2 of 8B blind, the contact 1 of 8K energizes, the contr-.ct 6 of 8 * 7 norunl, the Ipis 83, the contact 2 of 85 normal, and the electro-ain1A.nt tens TCDM which f (;;; ùtiol1ne in conjunction with the pulses received.

   The relsis 03 - ('e.,: The circuit for the double-ended relay 85 through: the G'JJ1'1: .nct 4 of 85, the nn ".; R. :: t 1 of 83 energizes , and the rCf; r; ort lf [81 '1 of!' ', 5 energizes. c;, u :: 1nd the relay 83 is neutralized, the relay 85 P' ei-Lii, t <. fully at Ü ' 0.-crfJ earth at contact 2 of re1D, is 82. 'Un c.tlw, it have z :. inteu ^ ni.: Crn: é for 1'é1ec1: ro-air.lD.nt TI of finn selector .1 ut through his interrupted reeeart]! Tc1J). ', Contact Il of 8'li norr'i-1,, IJ., L: ontf! <..: t 2 of 8K c:'; cite, the contact 3 of C6 na ml, the counter .; "5" Q 85 energized, and. M, earth. The final selector continues to advance until the following circuit is closed: battery, winding 8ô, contact 4 of eG normal, contact 4 of; 8K energized, brush and corrl- .ct of control bpnc C, contact and brush of bank TC1, contact G of? 85 energized, contact 2 of 86 normal, and earth.

   Relay 86 does not block iL through non-contact 1 to earth to contact 2 of 82 energized, and LI. opens the motor circuit at contact 3. Following the operation of 85, the second cymemb1e of impulses is recorded in the control switch of the UC units as a result of the CO; "1utr 'ton through contact 2 of 85. n, t '"nd 83 is excited for the second time, it partially actuates relay 87 which is

 <Desc / Clms Page number 17>

 type with two stages, and which is entirely excited through its con- tnct 1, qupnd 83 ect neutralized. Relay 85 also closes a battery circuit, non-inductive winding of 89, contact 3 of 87 normal, contact 5 of 85 energized, contact 2 of 88 normal, inductive winding of 89, contact 2 of 82 energized, and earth.

   This circuit is maintained through contact 1 of 89 when relay 87 energizes. When 87 is energized, the motor circuit is restored to contacts 4 of 87, contact 1 of 88 and earth. When the final selector reaches the contact corresponding to the number recorded in the units recorder, a circuit is completed for 88 through the energized contacts 4 of 86 and 8K, the bolai and bank C, the brush and the bnnc UC1, contact 3 of 89 energized, contacts 2 of 87 and 86 energized, and earth.



  Relay 88 energizes and connects an earth through the inductive winding of 89, contacts 2 of 88 and 89 energized, contact 3 of 8K energized, a winding of 8H, and test brush T. If the requested line is free, there will be a battery potential on the test terminal, and the 8H relay energizes and locks up through its second winding, the 8H contact 3, and the 8H lead. test. By its excitation, 8A closes the circuit for the bell relay through a coil of 8F, contact 4 of 89, contact 7 of 8 K, contact 2 of 8H, the negative conductor, return through the positive conductor , contact 1 of 8H, contact 6 of 8K, contact 5 of 89, the battery and back to ringing.

   This circuit is not complete until 89 is neutralized as a result of BIi's contact 5 circuit. This time interval allows the operation of the subscriber's cut-off relay e.vent that the ringing does not start.



  When the called subscriber answers, 8F gets excited and locks at contact 1 through its second winding and earth at contact 2 of 82.



  Contact 2 of 8F opens the 8K circuit which is neutralized and extends the line from the called subscriber to relay 8D which now energizes and reverses the current to the calling subscriber, actuating relay 6D fig. 6 in the start repeater which opens the relay 6MD circuit. When this relay is neutralized, it completes a circuit

 <Desc / Clms Page number 18>

 
 EMI18.1
 for 6 J> il q i "c-: quotes and reverses the current to the calling subscriber, the 1c" t.ionnnllt. ! '1.r'ni counter relay 5: MR,} <' 1 ['". 5 as has already been described.

   While the inrush current is being sent, there is a 4rx.ir ^ circuit through the energized 8H contact 6 and the condenser, for 1. >. "ox.in the calling subscriber that the ringing call takes place nor the subscriber <the; .- arrd is busy, there is an earth potential Rur ln. terminal of the test bench which prevents the operation of 8H and short-circuits the relay 89 which is neutralized. The relay 89 opens the circ: .3t of 80 r'u contact 3, and when 80 is neutralized, the motor circuit
 EMI18.2
 of the final selector electromagnet is still connected to the terminal
 EMI18.3
 1st to contact 1 of 88.

   The firia.'1 selector continues to advance until it stops the control (occ! .. 1.², tion, if the circuit for relay 88 is still connected to the contact. 3 of 89 and the bank and 1) ['Control J0i..Relay 88 closes the 8H circuit bare con 1.rct, 1, e? Iit, r <; t 2 of 89, contact 3 of 8K, a BIT winding, the bnlai T, e1 .lm battery. The relpiE! 8n is excited as it has already been dÓc: elt.,, 8t the occupying auditory sipnal is returned from the poritive and: negative controls of the bench. The 8F bell relay does not function iJTJ11dic.t0Y10.trt, causing 8K to be neutralized as already explained {1. Quf.nd 8K is neutralized, the circuit is also open for nf which nu contact 2 éJ oic: r: e the blocking earth of all 3en relpia excite, and connect the earth through the bnla.i We- nor r '= r 1 and the 1 "/ the.

   U03 to the units electromagnet, re-establishing this COy; pLtt: E.t;, r'tt, 7 '<L 10 normal and therefore closing a circuit through
 EMI18.4
 
 EMI18.5
 the bench 'l' "'towards the diznine electromagnet which is also brought back to normal. The c irou1 tel 'ef.J8r.l 1 is now plotted to pei.m put the c (J'11mtr.tfmr of control to be chosen for another call. When the nppe-innt subscriber hangs up, the relay 8A rye neutralizes and opens c ii <:> 1.1. for relay 13: 8, moving ai> ini the earth of the conductor ci 'c <-r, .i, and allowing the previous switch to be ni = uoral. <1i l The called subscriber did not hang up, the earth at contact 3 maintains relay 81I which maintains an earth on the ES brush:; -: i so that the cutout relay remains energized.


    

Claims (1)

CLAIMS. --------------------------- 1 - Telephone system comprising one or more offices equipped with two-way selector switches EMI19.1 of the ;; tro, rer type, and one or more desks equipped with switches - ("single-movement readers controlled by common control circuits, in which means are provided for cutomatically extending a conversation connection from a office equipped with the said first mentioned type of switches to an office equipped with the said second mentioned type of switches and / or vice versa. 2 - Repeater to be used at the starting end of a Junction line extending from the panel of a single selector EMI19.2 cO / 'J "' and é movement by a common control circuit and using a battery test, to a dual direction arrival selector EMI19.3 of the StrO'.7ccr type, said repeater being provided with means for applying a battery pot to the test terminals of said junction line when it is free, and for removing said battery potential from said test terminals as long as the trunk line is used. 3- Repeater can be used at the starting end of a two-conductor junction line extending from an equipped office by means of single-motion selectors controlled by switches. EMI19.4 cOrU-! 1.n: s control circuits, and leading to an office equipped by means of> / Stroveer type players, this repeater being provided with means by which control of the reestablishment of the connection * is transferred from the subscriber calling to an operator, when a call is extended through said trunk line to a .position EMI19.5 of opera sorting in from the office type Strov ,, Cer. 4 - Repeater which can be used at the outgoing end of a junction line with dcuxconduoteurs extending from an office using selectors of the strowGer type and terminating in an office using selectors with single movement controlled by common control circuits, this repeater being provided with means by which control of the reestablishment of the connection is transferred from the calling subscriber to an operator, when the call is transmitted through EMI19.6 to the junction line to an op position: w. *, office lice EMI19.7 U1; .. LSa n't ocr. ce-Readers with simple movementP11H'nt. <Desc / Clms Page number 20> 5- Telephone system comprising an office equipped by means of double-direction selectors of the Strowger type and an office equipped by means of selectors controlled by common control circuits, means being provided for prolonging a call from the first of the said offices mentioned in said second mentioned office, through a two-conductor junction line, and other means being established in the second of said mentioned offices to transmit supervision signals to said first office, similar to those used in the central offices of the Strowger type. 6- Telephone system comprising an office using two-way selectors of the Strowger type and an office using single-movement selectors controlled by common control circuits, means being provided for extending a call from said second office to said first office to through a two-wire trunk line, and other means in the second office to respond to supervisory signals returned from said first office. 7 - In and for an automatic or semi-automatic system, a double direction selector of the Stroweer type located in a first office, an arrival selector with single movement located in a second office, the said selector of arrival being controlled by a common control circuit for a series of similar selectors, a two-wire junction line extending from the Strowger selector panel to the arrival selector, a group of repeater relays placed at the end of departure from the. said trunk line for repeating pulses to the arrival selector, and means in said repeater for marking said trunk line occupied when said common control circuit is in operation connection with another arrival selector . 8 -Repeater according to claims 2, 3, 4 or 7, adapted to repeat the pulses on a closed circuit comprising both sides of the junction line in series, and to respond to 1 ' <Desc / Clms Page number 21> inversion of the battery current on the said closed circuit, to cause the counter to operate, 9. A repeater according to claim 7, wherein means are provided by which, when choosing a line of junction of a group of similar lines, the single-movement selectors them end ends of these lines. , are released by a common control circuit, all the free junction lines being first indicated occupied by an earth potential applied to a common conductor of the Strowger selector which has chosen the said junction line, and are then kept occupied by an energized individual guard relay through the common control circuit. 10 - Telephone system as described and shown in Figures 1 to 8 of the cièjcints drawings. 11 - Repeater as described and shown in Figure 3 of the accompanying drawings. 12 - Repeater as described and shown in Figure 6 of the accompanying drawings. ABSTRACT. The invention relates to a system for automatic or semi-automatic telephone central offices, and it includes the new facts described herein and shown in the accompanying drawings. More particularly, the invention relates to a telephone network containing one or more offices using two-way selectors of the Strowger type and one or more offices using single-movement selectors controlled by common control circuits, means being provided for making interconnections between these jars using these different types of selectors.