DE492895C - Circuit arrangement for telephone systems with several exchanges, in which the testing stations used for testing lines and connecting devices are only arranged in a few exchanges - Google Patents

Description

Circuit arrangement for telephone systems with multiple switching centers, in which the serving for inspection of wires and connecting means test centers are arranged in only a few switches addition to Patent 491 986 The main Patent, relates to a circuit arrangement for testing lines and connecting means. in telephone systems with several exchanges, in which the test stations are only arranged in a few exchanges. In order to carry out tests in the exchanges without test centers, in the arrangement according to the main patent, the connection devices used for speech communication are also used in these exchanges for test purposes, after these connection devices have been set by switching devices under the influence of the test center, which come into effect during voice connections , switching devices connected to the wires used for the test are disabled.

The invention is now a "time development" of this arrangement and consists in that the execution of. Tests of the speech communication equipment to be used via a special one between Aden switching centers with testing centers and the switching centers Connection line running without test points, only used for test and measurement purposes he follows.

Due to the new arrangement Äverrlen compared to the arrangement according to the Main patent obtained various advantages by initially using a special connection line only used for test and measurement purposes no voice connection line is withdrawn from general traffic during the tests. As in voice communication lines Both at the outgoing and at the incoming end often speech and current impulse transmitters are provided, it is also used when using the voice trunks Required for test purposes, special facilities for the environment of these transformers to be provided, because only with smooth metallic connecting lines without any Junctions, bridges, etc. are flawless tests possible.

When using a special test and measurement purpose Connection line can also be used to achieve impeccable I'r The insulation of this connection line is particularly important to the tests. Be it but still pointed out that it is also not necessary to have a special one Line to be laid only for test and measurement corners between the exchanges, because in the cable connecting the exchanges there are always reserve wires provided, and you can use the most protected cores of this cable, namely use the innermost ones for the test connection line.

In the drawings are some embodiments of the invention shown.

Fig. I shows one of the test center of an exchange outgoing test connection line to an exchange without a test center and one of these assigned test group selector and facilities on one of the Test group selector assignable voice line selector. After setting the last are switched directly by a switching device on the line selector connected to the contacts occupied by the switching arms of the test group selector.

In the embodiment shown in Fig. 2 takes place according to Setting a voice line selector, the direct connection of the test connection line via switching arms of a second test group selector to the switching arms of the voice line selector. The switchover is brought about by devices on the line selector.

In the A, bb. 3 is another embodiment of the invention shown in which the voice line selector is required after the setting has been completed Switchover by a switching device assigned to the test connection line after a certain number of series of current impulses has been brought about First, the arrangement according to the invention will be explained with reference to Fig. i.

A test connection line PTIL leads from the test center PSt of the main exchange HV to the sub-exchange UV without a test center. This test connection line ends in the sub- exchange UV in a test group selector PGIT-. If the inspector wants to establish a connection for the purpose of carrying out tests, she closes the contacts i, i 'and i "in any desired manner, whereby the following circuits become effective: earth, contact i, relay SR., Wire 2, windings I and II Relay C1, earth In this circuit, only relay Cl can respond, but not relay SR-1, since winding II of relay C1 is too resistive. Relay C1 remains until the connection line PVL is released after all tests have been completed energized prevented by opening its contact 3c1 premature activation: the tripping magnet I111 from Prüfgruppenwähler PGW and prepared by closure of various contacts, for example, the Kontakt® 4c1, 5c1, 6C1, 7c1, various prior dene circuits to which in the. Further description of the establishment of the connection will be dealt with in more detail. By closing the contacts i 'and i ", the following circuit was closed via the surge bridge of the test group selector : Earth, battery, relay A1, winding I of relay X1, contact i7ui, wire 1q., Contacts i ', 8, 55, resistor 56, contacts 57. 9, 1 ", wire i5, contact 2ou1, winding II of the relay X i, resistor 58, earth. In this circuit only: Relay A can respond, because the two windings I and II of relay X1 are switched in such a way that their effects cancel each other out. The relay X1 is therefore a differential relay. For the purpose of setting: the voter, namely the test group selector PGW and the speech line selector LW to be used for test purposes, the officer turns the selector switch WS and opens: through contacts 8 and 9 and closes contacts io and i i. When the officer activates the current impulse transmitter, which is designed, for example, in the manner of a finger washer, in order to send out number current surges, earth is connected to both wires 14 and 15 of the test connection line PVL via contact 12. As a result, the differential relay X1 was excited, because by connecting the earth to the wire 1 5 , the winding II of the relay X1 is short-circuited. The excitation current for relay X1 is as follows: earth, contact 12, impulse contact 16 of the finger washer, contacts io and i ', wire 1q., Contact 17u1, winding I of the relay X,., Relay A1, battery, earth. The relay X1 closes when it responds via the contact 18x1 the following holding circuit via its winding II: earth, battery, resistor i9, contact 18x1, winding II: of relay X1, contact Zoui, wire 15, contacts i "and ii -and 12, Earth. Through this holding circuit, the differential relay remains energized for the duration of the current impulse series. The relay X1 prepares the circuits for the setting magnets idesPrüfgruppewählersPGf 'at its contact 21x1 and a circuit at its contact 22x1 for: the later setting of the PGW to be occupied by the test group selector When the finger disc expires, the impulse contact 16 is interrupted intermittently, - so the circuit via the winding I #les relay _I i and the relay -1 is opened intermittently. The relay X1 cannot drop out because it is via its winding 1I is kept energized, so only relay .I1 drops out, which at its contact 23a1 is the circuit for Hubinagn eten I. l. closes: earth, contacts 2rx1. 24p1, 23a1, 25q "shaft rest contact 26, z" 1, lifting magnet Hl, battery, earth. The test group selector is gradually raised to a desired contact group.

Since only a single line selector is required to carry out the test items in each participant group, it is sufficient if the test group selector in each participant group only has access to a single voice line selector. As a result, it is not necessary for the test group selector to make a free choice after setting to a Kontakterru ppe, but rather he . "i can be set to a specific contact in the contact group by a second series of current bursts, so that with hundred-part test group selectors (e.g. Strowger voters), io ooo subscriber lines can be tested using a single test group selector, corresponding to the 100 line groups of 100 subscriber lines In the present case, the test group selector does not look for a subordinate voice line selector after occupancy of the first rush row, but is set to a certain voice line selector of a certain subscriber group (i ooer group) by a second rush row.

At the first stroke of the test group selector PGTI 'the head contact 27k is closed and thereby the excitation circuit is prepared for a switch relay 0. This electric circuit comes into effect, after the finger washer has expired, it separates into: the Test point .the contact 12 was opened and therefore the relay X i drops out. Above the closing contact 28a-1, the relay O1 is energized: earth, battery, contacts 28x1, 27k, shaft contact 297v "Relay O1, earth. The relay 01 prepares on its Contact 30q1 has a holding line to be explained later, disconnects at the contact 25 (1, the lifting magnet H, switches off the rotary magnet at contact 31q1 D1 .an.

When sending out fier second series of current impulses through which the switching arms of the test group «-abler on a certain contact. in the selected contact group and thus be set to a specific voice line selector VT ' the turning.

magnet Dl operated in the same way as the lifting magnet H ,. By the relay X i excited when contact 12 closes is via contact 32-i-, the holding circuit prepared at contact 30q1 for relay .O, closed, otherwise the relay. Dl would drop if the contact 29w1 in the first turning step the voter shaft is opened.

The series of ruptures drops after the end of the rotation, read relay 0 , since contact 32x1 is opened. When the selector was first turned, contact 26w was also opened, so that: the lifting magnet Hi was influenced by the series of current impulses used to adjust the line selector, which again influenced contacts 21-1- and 23a. is prevented.

The relay 01 is equipped with a delayed armature dropout, so that it remains closed for a short time after the dropout of the relay ki and thus the test circuit for the relay Pi is closed via the contact 33q1.

If the selected line selector LW is busy: o Relay P cannot respond in a known manner. As a result, the Koltakt 34p1 is not opened, so that after the relay Q1 drops out, the winding II of the relay Ci is short-circuited in the following way: earth, head contact 35k, contacts 34.p1. 4c ,, 36q1, shaft normally open contact 37w1, connection point between windings I and II of relay Ci. By short-circuiting the winding II, the current is amplified via the relay SRI in the test station in such a way that the relay can respond and switch on the monitoring lamp L1 at its contact clock 38sf-1. The official at the test center recognizes from the lighting up of the lamp L1, that the line selector LWi of the particular subscriber group is currently blocked and she cannot carry out the test and opens the contacts i, i 'and i''. Opening the contact i de-energizes the relay Cl, which closes the following circuit for the release magnet 31 via its contact 3c: earth, head contact 39k, contacts 40p1, 3c1, release magnet 311, battery, earth. The test group selector P (TIT 'goes back to its rest position, it is now assumed that the line selector L ff' selected by the test group selector is free. As a result, after the relay X 'has dropped and the contact 41x1 closes as a result of this, it opens of contact 33q1, the following circuit is effective: earth, contacts 41x1, 33q1 Wickhingen 1 and 1I of relay P "contact 6c, switching arm 42, contact 43, winding I of relay C., control switch contact 44, battery, earth. RelayPl closes on Contact 45P1 to which earth is connected via the head contact 46k, its high-resistance winding I is short and thus switches on in a holding circuit that is independent of contact 33q , 49 existing access is blocked. The relay P, furthermore prevents the lifting magnet Hl from being influenced by further current impulses by opening the contact 24p1 rows. By closing the contact 47p it prepares the setting of the line selector LW and switches the wires 5o and 51 to the switching arms 52 and 53 of the test group selector PGW at the contacts 48p and 49p.

If, for the purpose of setting the line selector LW, the inspector opens her finger washer, the relay X1 is energized again, which closes its contact 22x, thus preparing the transmission of the current impulses to the line selector, which is triggered by the intermittently falling relay A, at contact 54a, for Not shown surge receiving relay of the line selector are transmitted.

The setting of the line selector is made in any known one Way. It is assumed that the line selector is equipped with a control switch is that after: the two come into effect, the setting of the switching arms of the Line selector on a certain contact causing atromic surge rows in .the position 3 is.

Since the relay A ,, after moving the switch WS to the rest position in the circuit closed via the wires 14, 15 and the resistor 56 is excited remains, the contact 59 is closed and the control switch of the line selector is in position 3, the following circuit is established: earth,. Relay T, _ Control switch contact 6o, position 3, contact 61tr, contact 62, switching arm 52, contact 48p ,, wire 5o, contact 59a ,,, relay U1, battery, earth. The relay U responds, switches itself on via its contact 63u, and its winding II in .eine of the contact 5c, dependent holding circuit on, separates .by opening contacts 17u, and 2oza, the current impulse bridge consisting of the relays X, and A ,, and connects the wires 14 and 15 via contacts 64u and 65u, with wires 5o and 51 and thus with the switching arms 52 and 53.

Simultaneously with, the closure of the holding circuit via his Winding II has the relay U, a circuit for the relay T, closed: earth, Contacts 66c1, 67a ,, relay T,., Contact 6314 ,, battery, earth. The relay T switches via contact 97t and contact 5c, into a circuit that is independent of 67a1 on and has closed the contact 68t1, so that the following circuit for Effect comes: earth, resistor69, contact68t ,, switch arm7o, contact 71, relay N and Tr, battery, earth. In this circuit, due to the high resistance 69 only trigger relay Tr, but not relay N. Relay Tr closes the following blocking circuit at its contact 72tr: earth, contacts 72tr, 73n, switching arm 74, contact 75, wire 76, normally closed contact 77 of the preselector VW, switching arm 78, windings II and I of the relay T @, head contact 79, battery, earth. The relay T2. Switches by opening the contacts 8o and 81t2 the call relay R, off. The connection of the .Veins 82 and 83 with the switching arms 84 and 85 via the contacts 86t2 and 87t2 no further switching process results; @ because the selection is in the idle position is located and on the contacts occupied by the switching arms in this position; no Line is connected.

Apart from or closure of the blocking circuit, the relay Tr has through open the contacts 61tr and 8otr, the facilities required for speech connections of the line selector, such as feed bridge, capacitors, etc. are switched off and the Switch arms 52 and 53 of the test group selector PGW via contacts 89tr and goti- directly to the switching arms g1 and 92 and thus via the contacts 93 and 94 connected to wires 82 and 83 of the selected subscriber line.

A smooth metallic connection is now made from the test center to the subscriber line in the exchange without a test center. The official of the test center can carry out any necessary test. She can. also check the working of the connection devices in the exchange without a test center, for what purpose it closes contact 95 and thereby energizes relay A via wire 96. The relay A, opens its contact 67a ,, WO-by but the relay T is not affected, because .sich has the excitation state of this as mentioned As far back, 97t on its contact, turned into a holding circuit. Furthermore: the relay A, the contact 98a., And amplifies the current flowing through the relays N and Tr of the line selector LW as a result of short-circuiting the resistor 69 so that the relay N can respond. The relay N opens its contact 731a and thereby interrupts the circuit for the relay T2, which drops out and, by closing the contacts 80t2 and 81t2, applies the call relay R to the wires 82 again. If the inspector by connection. of the resistor 56 establishes a direct current bridge ari your workplace between the wires 14 and 15 of the test connection line PVL, the preselector VW is stimulated in a known manner and stabs a downstream number current impulse receiver, for example the first group selector I. GTV. The inspection officer can now by setting an I. GTI, 'on a connecting line T'Ll running back to the main exchange HV and by setting the group dialers II. Gllr and III. GTI 'occupy a connecting line VL2 leading to the test center. After setting the above-mentioned N.uminernstromimp.fänger, the inspector switches an alternating current source in the bridge to the test connection line PVL by flipping the call switch RS and closing the contacts ioo and ioi, whereby the call relay R is excited on the connection line VLh in the test center PSt and via his Contact 102r turning on call lamp AL. The inspection officer can see from your lighting up (read lamp which connection line it is connected to and can carry out a round test by means of appropriate switching measures, e.g. by opening contacts 103 and 10q. And closing contacts 105 and i06 of a test switch PE connects to one another via the connection lines and locking devices used.

After all the tests have been carried out, the test group selector is triggered in the manner already described by opening contact I. When relay C1 drops and contact 6c1 opens, relay C ... in the line selector LW also drops out which causes in known manner the triggering of this line selector. Further, the Atisläsung behind the selection VTI 'lying number impulse receiver GW I., II. and III Gil`. Gf' also takes place in any known manner.

In the exemplary embodiment shown in Fig. 2, the test connection line PVL at the incoming end of the switching center without a test center is assigned two test, group selectors PGU'1 and PGW2. Both test group selectors are set at the same time and in the same step. A speech line selector is set via the test group selector PGW2: LW. " While the tests are carried out using the test group selector PGW1, whose fixed contacts are directly connected to the switching arms of the speech line selector in the various participant groups Test group selector PGW1 and PGW2 can of course also be used with a test group selector with a corresponding number of switching arms (6 in the present case).

For the purpose of setting the test group selector PGU'1 and PGTV2, the officer of the test center PSt closes the contacts toi, gor 'and. 20i ", which correspond to the contacts i, i 'and i" of Fig. I. The relay C3 at the incoming end of the test connection line PVL is excited via the contact toi, which among other things opens the contact 202c3 and closes the contacts 203c3, 2oq.c3, 205c3, 206c3, 207c3, 208c3, 209c3, and 2ioc3. Opening the contact 2o2cs prevents the release magnets 1,1 and -114 of the test group selectors PGW1 and PGW2 from being switched on prematurely. By closing the above-mentioned contacts rles relay Cs., A series of circuits are created, which will be discussed in the further description of the connection establishment. From the relay A2 and. X., existing shock bridge, when the contacts toi 'and toi "are closed, only the relay .s42 is excited, but not the relay X ..., which only responds when the finger washer is lifted after the selector switch WS is turned and the contacts are closed 2i i and 2r2 is connected to the wire 21.5 via the contact 2i3 earth. The relay X., by closing the contact 216x2, prepares the circuit for the lifting magnets H3 (PGW4) and H4 (PGW2), which in the event of discontinuous .: of the impulse relay A., closed as follows during the return of the number switch: Earth, contacts 217a2, 216x2, 218p3, 2i97 "parallel lifting magnets H; and H, "Battery, earth. Both test group selectors PGWl and PGTI '=` -earth raised step by step in front of a certain contact group. After the end of the series of impulses, relay X 2 drops out again and closes via its contact 220x2, since K @ ontaht 22i12: The following circuit was closed during the first stroke step of a test group selector: earth, contacts 204c3, 222p3, 223w (shaft contact of one of the test group selector), reversing relay V, IA winding I, head contact 221 k, contact 220a-, battery, earth. The reversing relay Z 'prepares at its contact 224.V upstream a holding circuit via its winding II, switches off the lifting magnets H3 and H4 by opening the contact 229z and brings the rotary magnets D3 (PGTI'1) and D4 (PGW2) depending on via the contact 225v the power contact 217a2.

During the second series of impulses affecting the rotary magnets D3 and D4 is again the relay X, energized and has its contact 227x2: closed, so .that-, the Holding circuit across winding II of relay T ' takes effect: Earth, contacts 205c3, 227x2, winding II of relay h, contact 224v, battery, earth. 1-circuit for the rotary solenoids D3 and Di is prepared via the contact 216x2, which receive a current impulse via contact 217a2 each time relay A2 drops out. At the first three-step of the test group selector, contact 223w is opened. if After the end of the series of impulses, relay X2 drops out, so -will open through of contact 227x2: the holding circuit is interrupted via winding II of relay TI, so that this drops out, because its winding I can .this relay not energized stay because, as already mentioned, contact 223w is open.

Relay X2 also closes rlen contact when it drops out 228x. ,, so that when the selected speech line selector LW "is free, the following test current The following becomes effective: Earth, contact 229v1, 228a: _, windings I and 1I of relay P3, switching arm 23o, contact 231, winding l of relay C, control switch contact 232, battery, Earth:. The relay P, closes at its contact 233A3, at which earth to the contact 209c3 is switched on, the high-resistance winding I short and thereby blocks the selected Line selector Lf'2, so that this is not from a talk group selector via the existing access from wires -23d., 235 and 236 can be assigned. The relay P3 also prepares the transmission by closing contacts 23p3 and 238p3 .the current surges to the line selector and opens at its contact 2r 8P3, the Circuit of the setting magnets of the test group selector.

The relay C4 prepares the circuits for setting in a known manner of the line selector LW., voi #. The current surges are transmitted through contact 239a2, because the contact 240v is closed., and while there is a series of current impulses: also the relay X2 is energized and has closed its contact 241a-_. About the contacts 207c3, 2.42s, and 238P3 battery rests on your switch arm during each surge period 243 of the test group selector PGU'2 and: thus on the wire on which in known Way a control relay is switched on.

The line selector is set up in any known manner. It is assumed again that the line selector is finitely equipped with a control switch which is in position 3 after the line dialer setting has been completed. If the relay X2 of the test connection line PVL has also dropped out, the following circuit becomes effective: Earth, battery, contact 206c,;, winding I of relay L 2, contacts 245x. ", 2 3p3, switching arm 24.6, -contact 247, control switch. Contact 24 $, position 3, relay J, earth. The response of the relay 1x prevents the control switch of the line selector from going into those positions in which the switching operations required for voice connections, such as checking, calling and switching through, are prevented in a known manner The relay U2 switches itself on via its normally open contact 249u.2 and its winding II in a holding circuit dependent on the contact.2o8c .. Furthermore, it disconnects by opening the contacts 250u2 and 251-1, t2 the surge bridge from the wires 21. and 215 of the test connection line PVL. and switches the said wires via .the switching arms 252 and 253, - the contacts 2.54 r and 255 directly to the switching arms 256 i and 257 of the line selection r LW, and thus to: the selected subscriber line to. Closing contact 2582a.2 creates the following circuit: earth, contacts 210c3, 258u3, resistor 259, contact 260a2, switch arm 261, contact 262; Switch arm 263, contact 264, relay 265, battery, earth. The selected subscriber line x is blocked from being occupied by another line selector by connecting the ground via the low-resistance resistor 259.

From. The test center PSt is now a: smooth metallic connection bad = the wires 214 and 2z5 of the test connection line PVL, the switching arms 252 and 253 of the test group selector PGW and the switching arms 256 and 257 to the selected subscriber line, so that any desired test can be carried out. ZZ'enn the inspector wants to check the functioning of the connection devices in the exchange UV in addition to the selected subscriber line, she closes the contact 2.70 in any known way, for example by pressing a button and thereby energizes the relay A2 via the wire 271, which the Contact 260a2 opens and thus interrupts the circuit via relay 265. The relay 265 corresponds to the relay T2 of Fig. I, so that a preselector assigned to the selected subscriber line can start and occupy a downstream connection device in the manner explained in the description of Fig. I.

In the embodiment shown in Fig. 3 is a line selector assumed to which no switching means is assigned, that after setting the line selector on a switching device on: the test connection line acts that the immediate Connection of the test connection lead to the switching arms of the line selector. The switching device the test connection line is accordingly depending on Gien brought to effect current impulse series and leads the mentioned switchings off if the number of current impulse series (-las Indicator is given that the line selector is on a connection line has been set.

A system structure is shown as described in Fig. 2, .d. 1r. an arrangement with two test group selectors that can be set simultaneously and in the same step PGTI'1 and PGW2, but it goes without saying that. the same arrangement too can be used in a system according to Fig. z by using the changeover relay HR via a special switching arm of a test group selector (like switching arm 7o at Fig. Z) acts on a relay of the line selector (Tr. Fig. Z), which in turn acts the switching arms of the line selector directly to the from the test group selector, switches on occupied contacts.

The operation of the arrangement shown in Fig. 3 is as follows. For the purpose of setting the test group selector PGWl and PGW2, the relay C is energized by closing the contact 307 in the following way: earth, battery, contact 301, wire 302, relay C ,, winding I, head contact 303k, earth. The relay C; puts back various contacts, among other things it closes the contact 304c :, and thereby prepares the setting circuit for the lifting magnets H, (PGYf1) and II ,; (PG11 ':,). In the current impulse: bridge consisting of the relays% 1 ", Z" and B3, at the incoming end of the test connection line PVL, after the contacts 301 'and 3o1 were closed, "only -Never relays A" and B "were energized, since relay X ;, Again a differential relay is: - After switching the selector switch II'S, closing the contacts 305 and 3o6 as well as the elevator of the number switch, the winding II of X .. is short-circuited by @lie via the number switch contact 3o7 to the A: ler suction connected earth, so -that - (read relay X., responds in a known way, by closing its contact 309x. a holding circuit via its winding 1I and for the relay B "closes. By closing the contact 310_e" the circuit for the solenoids H, and H ,; further prepared. If the relay f13 drops out intermittently when the switch has elapsed, the X-magnets H, and II, lying in parallel, receive current impulses in the following way: earth, contacts 310x ", 3tza", 30.1c "31211Y_, 31311. r ": magnet H, and H ", battery, earth. With the first stroke step of one of the test group selectors, the head contact 303k is opened, the relay C, but remains .excited during the series of current impulses via its contact 314C and the contact 315_x ".

When the series of current impulses is terminated, the relay "drops out" k "the relay C ;, switches off by opening the contact 304c, the solenoids H ,; and H6 from and by closing the contact 316c ;, the rotary solenoids D, and D ". Received when sending out the second series of impulses. the rotary magnets D, and D ,, in the known way their current surges, the relay kg is energized again and prevented by opening contact 317x3 while rotating the test group selector the creation of a test circuit via winding II of relay C ,. is the relay x3 has dropped out at the end of the second series of impulses, so comes when the Line selector LW "is free, the following test circuit is effective: earth, contact 317a; ", 3z811", winding II of relay C "switch arm 32o, contact 32z, Wick-Iting I of relay C,;, head contact 322k of line selector LW ", battery, earth. The Relay C, switches on via its contact 314c, and the one with the first turning step one of the test group selector closed contact 323w into a holding circuit a.

-Now, a switching device consisting of the relays HR, HR2 and HR., Is switched on via the contacts 324u 'and 3 "25a, which is influenced by the two current impulse series setting the line selector LII'3 and after the last current impulse series has come into effect , by means of which the line selection selector is set to a specific connection line that carries out the switchovers required to carry out tests.

If. for the purpose of sending out the first series of impulses setting the line selector, the number switch is pulled up and relay X "responds, <las relay HR, is excited in the following way: earth, contact 326_a, winding I of relay HR", resistor 327, contacts 325c ,, 32.1w, - battery, earth. The relay HR2 switches itself on via its winding 1I and the contact 32811r2 in a holding circuit. Relay HR "opens its contact 31211r2 and closes Y its contact 32917.r 2. The current surges are transmitted through contact 311a" and proceed as follows: earth, contacts 310x3, 311a; ,, 301.c,;, 32123-2 , Switching arm 33o, contact 331 to the current impulse receiver relay, not shown, in the line selector LI @ I'3. When the relay Y3 was energized, the battery was switched on via the contacts 3327x1, 333c ,, 33x3, the switching arm 335 and the contact 336 to the control relay B4 of the line selector Lii, "" and this energized. The line selector is set up in any known manner.

-After the end of the series of impulses falls (read relay X, from, opens contact 326x; and closes the contact 337x3, so that now the relay HR, is excited in the following way: earth, contacts 337x3, g38hr2, relay HR., contacts 325c6, 3247. ', battery, earth. The relay HR switches on via its contact 339hri in a holding circuit independent of contact 337x and closes at contact 340121-i the winding I of the relay HR, short. If before the beginning: the next Current impulse series the relay X3 responds to, as a result of the closure of the contact 326x3 the winding II of the relay HR. shorted. Since the winding I of HR, is short-circuited at contact 34oh.ri, the relay HR, drops out and opens the Contact 329h1-2 and closes contact 3I21tr2. But since the relay HR, energized is, run for setting the line selector LW., to a specific one Contact required current surges via contacts V2hr-, and 3411tri.

-After the end of the last series of current impulses and the relay has dropped out s .. different switching processes occur. Despite opening the contact 334x3 is a dropping of the control relay B ¢ in the line selector L TV, prevents, because this Relay is kept energized in the following ways: earth, battery, contacts 332Iru, 333c6, resistor 342, contacts 343h.1- i, 344hr @, switch arm 335, contact 336, relay B "Earth. Since relay B4 remains energized, you can use the line selector for voice connections switching processes that occur automatically, such as checking, calling, switching through, do not be executed, because the relay B4 holds at its contact 345b, earth from the test relay P; switched off. Since the relay P.1- cannot take effect, the Switching processes that are dependent on testing, such as calling and switching through, do not occur, There is glass in the test connection line PVL. of relay X3 due to closure of contact 337x3 also excites relay HR3: earth, contacts 337'a, 347h1'-, 3481t1 '.' Relay HR3, contacts 325c6, 32: 1.w, battery, earth. That Relay HR3 opens its contact 349h1-3 and thus prevents an unintentional Adjustment of the #, release magnet M, and l11 ,, of the test group selector PGZT ',. It it should be added here that up to now the activation of the release magnets has been caused by this was prevented that the circuit through the permanent .erregte relay B3 at the contact 35ob, was open and also a contact 3511c, des Relay C, 'is located. Furthermore, the relay HR3 has closed its contact 352h1-3 and through the switching arm 353, the test relay P to .the switching arm 354 of the line selector LW., Switched on. If the selected line is free, relay P6 responds: Earth, winding I and II of relay P ,, contacts 352h1-3, 3551-t2, switch arm 353, KOritakt 356, switch arm 354, contact 357, relay 358, battery, earth. The relay P, blocks the line found by short-circuiting the high-resistance winding I. at contact 359A., and prepares a circuit for the relay at contact 36op N2 before.

In addition to the switching operations just described, the relay HR, through Open its contacts 361h1-3 and 362hrg consisting of the relays A3, X3 and B3 The surge bridge is switched off and the test connection line PVL via the contacts 363h1-3 and 364h1-3 the switch arms 363 and 366 the contacts 367 and 368, the switch arms 369 and 37o of the line selector LW "and the contacts 371 and 372 connected to the speech wires of the busy subscriber line.

The officer can now carry out any desired test.

In addition to the subscriber line, the officer also wants the connection facilities check in the exchange without a test center, it closes, for example by a button the contact 373 and .energy the relay N ", which the contact 3551-c-, opens and thereby interrupts the circuit via relay 358. A The selection assigned to the selected subscriber line can now be entered in the Fig. I start up and refer to a downstream connection device to adjust. Relay P is connected to a holding circuit via contact 3741t2 switched on and remains energized.

If the set Connection devices, namely the test group selector PGWi, PG9% 2 and des Voice line selector LT @ T "#. Should take place, the officer opens the contact 301 and thereby causes Idas relay C to drop out, which by opening the contact 325 interrupts the circuits via the relays HR, and HR3. Ras relay HR3 drops and closes its contact 3 ¢ 9h1-3, so (let,: since contact 351c5 is also closed is, the tripping magnets 3211, and 111 "respond and both test group selector PGW, Bring the Lind PGW2 to the rest position. By t) opening the contact 333c, the circuit -for the control relay B, F of the line selector Lyf; interrupted. There, too, that Relay C, energized holding. Contact 377c6 is opened, this relay drops out. The current flow of the two relays C8 and B4 in the line selector is also this in any. triggered in a known way and in the rest position brought.

Claims (18)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with several exchanges, in which the test stations serving to test lines and connection devices are only arranged in a few exchanges according to Patent 491 986, characterized in that the setting of the speech connection devices (LW, Lg; -2 , LW,) in the exchanges without test centers via a special, between the. Switching centers with testing centers (HV) and the switching centers without testing centers (UV) for testing and measuring purposes only. serving connecting line (PVL) takes place. 2. Circuit arrangement according to claim i, characterized in that after the setting of the speech connection devices (LW., LW2, LW ") to be used to carry out tests, arranged in the exchanges without test points, by the test point (PSt) switching devices (U1, T1, Fig . i; U2, Fig. z; HR3, Fig. 3) which make automatic switchovers through which the set speech connection device (LW) is brought into a state suitable for carrying out tests (production of a smooth metallic connection between the test connection line and the Switching arms of the LW) 3. Circuit arrangement according to Claim i, characterized in that the test connection line (PVL) is assigned a number current surge receiver (PGW) which, through the test center (PSt), to the speech connection devices (LW "Lyiz'2, LW, ) is set. q .. Circuit arrangement according to Claim 1, characterized in that the test connection line (PVL) is assigned two ummeristromätoßempfänger (PGW1, PGW 2) which are to be used for test purposes in the individual subscriber groups at the same time and in the same step by the test center Speech connection devices (LW2, L1173) can be set (Fig. 2 and 3). 5. Circuit arrangement according to claim q., Characterized in that on the switching arms of a number current surge receiver (PGW'2) the setting of the downstream speech connection device (LW.) And on the switching arms of the second number current surge receiver (PGW1) the test of the - speech connection device (LW z) occupied connection line takes place. 6. Circuit arrangement according to claim 2, characterized in that that the switching devices (U1, T1, UZ and HR3} of the test connection line (PVL) assigned. 7. Circuit arrangement according to claim 6; characterized, that the switching device (U1, Fig. i, and U2, Fig.2) is set by an on Speech line selector automatically triggered switching process (closing from 6o; Fig. I; 248, Fig. 2) is influenced. B. Circuit arrangement according to claim 6, characterized in that the switching device (HR., HR2, HR3) by the of sent to the test center for setting number current impulse receivers (LW, LW,) serving series of current impulses is influenced and the switchings only then v initiated if the number of current impulse series effective (e.g. 2) the indicator is given that: -all numbered surge receivers are set are. 9. Circuit arrangement according to claim 8, characterized in that the switching device is brought under the influence of the surge receiving devices (X3) only after setting the test connection line to, geordneben P'rüfgruppewählers (PGW1, 2) (after the closure of 324w and 325c6). ok Circuit arrangement according to Claim 7 or 8, characterized in that the switching device (U1) acts on an auxiliary switching means (Tr) of the line selector (LW) which, bypassing the devices (capacitors, bridge relays, etc.) of the line selector serving for speech connections, acts on the Test group selector (PGW) occupied access to the line selector (LW,) connects directly to the switching arms (9i, 92) of the latter. i i. Circuit arrangement according to Claim 7 or 8, characterized in that the test connection line (PVL) is connected by the switching device (U2, Fig.2; HR3, Fig. 3) to special switching arms of the test group selector or to the switching arms of a second test group selector (PGe1), which directly via the occupied fixed contacts - with the switching arms (256, 257 and 369, 370) rles of the set line selector in connection. r2. Circuit arrangement according to Claim 3, characterized in that the Line occupied by the voice line selector through the line on the test group selector Switching means (258tt2, Fig. 2) is blocked. 13. Circuit arrangement according to claim 12, characterized in that the switching means (68t1) of the test group selector (PGW) on a locking device (Tr) on the line selector. acts, which in turn, the blocking of the occupied line (at contact 72tr). 1q .. Circuit arrangement according to To: Claim 12, characterized in that the switching means on the test group selector directly finite (learn test arm of the set voice line selector via the occupied contact is connected and blocks the line in use (Figs. 2 and 3). 15. Circuit arrangement according to claim i, characterized in that: the test connection line (PVL) Switching element (Ai, Fig. I; N2, Fig. 3) is assigned to which of the test center is controlled and when it takes effect, the blocking of the set by Voice line selector cancels the busy line. ° .t6. Circuit arrangement according to claim 15, characterized in that the switching element (A2) is connected to the test group pen selector Disables blocking potential (by opening contact a6oa2). 17. Circuit arrangement according to claim 16, characterized in that the switching element glass test relay des Test group selector from the wire leading to the test arm of the line selector switches on in a local circuit (at contacts 35511 "374%). 18. Circuit arrangement according to claim 15, characterized in that the switching element (Al) acts on a special auxiliary switching means (N) of the line selector, which switches off the blocking potential (earth via contact 72t'-) switched on by another auxiliary switching means (Tr). ig. Circuit arrangement according to Claims 1 5, characterized in that a relay (A,) of the surge bridge of the test connection line (PVL) is used as the switching element to cancel the blocking of the line occupied by the line selector. 2o. Circuit arrangement according to Claim rg, characterized in that the relay (A,) is controlled by the test station for the purpose of canceling the blocking via a special wire of the test connection line. 2z. Circuit arrangement according to Claim 15, characterized in that after the blocking on the occupied line has been lifted by setting connection devices (VW, L GW, Il. GW, III. GW ) accessible via the latter, the official at the test center establishes a test path which devices. the test center via the test connection line to the exchange without a test center, the test group selector located in the latter, as well as the set speech connection devices and a connection line returning to the test center.