DE929375C - Circuit arrangement for checking the operational readiness of subscriber connection devices - Google Patents

Description

Circuit arrangement for checking the operational readiness of subscriber line equipment To keep the telephone equipment in a continuously operational condition received, are known to ex officio examinations of voters and lines Operational readiness, including tests of the subscriber lines, carried out.

It can happen that a subscriber serving his connection point. impressed by any, mostly randomly occurring malfunctions, in the proper one Doubts the condition of his connection devices. The present invention provides in such cases your subscriber has the opportunity to use his own connection line, in particular his connection apparatus to check for operational readiness, which thereby it is achieved that sent out by a subscriber station, the own connection number corresponding series of current impulses from one located in a special connection path Device can be controlled so that the last rush series, preferably the last current surge line, saved and only after the final signal has been given by the side be forwarded to the subscriber station for the purpose of completing their connection or will.

The drawing shows an embodiment of the subject matter of the invention shown.

Fig. I shows a schematic representation of a telephone system equipped with the arrangement according to the invention for three-digit calling numbers. A subscriber Tu i reaches the subscriber Tia 2 via preselector VW i, group selector I. GLI` i, line selector LW i, as well as subscriber T "3 via preselector VW 2, group selector 1. GIF2, line selector LW 2 to Subscriber Tzz4. If the subscriber Tn i wants to check the operational readiness of his telephone set, he first sends out a special code provided for this purpose. This brings the first group selector I. GTI 'i into a position via which a device designated RRE (callback device After this facility has been assigned, the pre-selector L'bI'r- runs until it has found a free first group selector 1. GI1'2. The subscriber now sends out a series of impulses according to his own call number .Gil'2 on the line selector Lll'-2 and set by the second of these line selectors in a certain decade in the direction of the RRE, their transmission to the line selector prevented. After dialing their own number, the subscriber hangs up the phone. The callback device then transmits the series of current impulses corresponding to the last digit of the call number to the line selector LW2, which is thereby brought to the upper contact connected to the subscriber's connection line T1z i in the set decade. The subscriber is called in a known manner by the ringing current applied in the line selector LIl '. Lifting the handset and replacing it or automatically after a certain period of time completes the test process and triggers the set devices.

Fig. 2 shows in detail the parts of the callback device RRE; their How it works can be seen from the following detailed description.

After the code number for testing the connection point has been sent and the group selector 1. GW i has been set accordingly, the callback device is assigned via: test wire c, lock button SpT, contacts i4s, 13c, winding 1I of relay C, resistance Wi 5. Minus. The relay C responding in this circuit closes a hold circuit for itself via contact i2c, with its winding 1 being included in the circuit. By closing the contact 8 c a loop is placed between the speech wires a and b: upper speech wire a, contact 5 e, choke coil Dr, contact 8 c, lower speech wire b. As a result of this loop formation, the preselector Vwr is started, which is set to a free group selector I. GW 2 (see Fig. I). The subscriber now sends current impulses corresponding to the first digit of his call number, which are picked up by the relay E of the callback device: Earth in the group counter I. GI1 'i, wire a, contact 2.-1, winding of relay E, minus. By opening and closing the contact 5 e, the current surges are transmitted via the preselector Vwr to the group selector I. GW 2. But contact 15 e is switched on relay V via its two windings I and II. The winding I is short-circuited at contact 16v, so that relay 1 'receives a dropout delay and bridges the series of current impulses. By short-circuiting the choke Di- at contact 7v , the quality of the impulse current is increased. Above earth, contacts 26c. 23v the relay H i is switched on. At the end of the series of impulses, a circuit for relay H2 is closed after relay l- 'has dropped out: earth, contacts 26c, 24v, 251i. i, @% 'iclclung I of relay H2, minus. Regardless of contact 2411 'and 25 1a i, relay H2 is in a hold circuit via contact 32112 and winding 1I. The t 1) transfer of the second digit takes place in the same way. When relay 1 "is switched on again, the following circuit is created: Earth, contacts 26c, 28Z1, 27112, winding of relay H3, minus, so that relay H3 responds. After the end of the series of impulses and relay 1" drops out, relay H4, winding I becomes switched on via contacts 31113 and 29v, which is placed in a holding circuit via contact 33h-1 and winding 1I. The pulse contact 5e is short-circuited at contact 614, so that the last rush current transmitted by the subscriber cannot be transmitted to the line selector LW 2. For this purpose, a memory device is influenced according to the last digit of the call number, Zeas happens in the following way: When the first pulse of the last digit arrives (response of the relay E), a charging circuit for the capacitor Co i is closed: Earth, contact 6-.c, Capacitor Co i, contact 4-1z1, winding I of relay Z i, contact 411a4, resistor 117.i2, minus. The relay Z responds and is placed in a hold circuit via contact 43 si with the opening of contact 44, i. After the end of the first pulse and the relay E drops out, the capacitor Co i is discharged via contact 63e and resistor I1 '£ 3. When relay E is switched on again by the second pulse, a charging circuit is again closed for capacitor Co i, which now runs through relay Z2: contact 64e, capacitor Co i, contacts 48z i, 47--2, winding I of relay Z2 , Contact 4i 1z4, resistance like, minus. The responding relay Z2 is held by opening the contact 47Z2 via contact .a.5--2. The drop in relay E in turn causes the capacitor Co i to discharge. Relay Z3 is switched on with the next pulse: earth, contact 64e, capacitor Co i, contacts 54th, 2, 53 - 3, winding I of relay Z3, contact 411Z-4, resistor yf'i2, minus. A holding circuit for relay Z3 is closed via contact 522-3 with opening of contact 5323. The series of Z relays is not shown in full. There are ten such relays, of which relays Z4 to Z8 have been omitted. The relay Z9 is switched on via contacts 58--8 and 57z9. The hold circuit for this relay runs via contact 56s9, while the switch-on circuit for relay Z io runs via contact 6i s9 and the hold circuit via contact 62-10. In the series of Z relays, starting from relay Z i via Z2, Z3 etc., as many relays are excited as the number of pulses corresponding to the last digit of the call number contains. When keeping the first relay of the Z-Reilie a circuit for the @@ 'ichlung I of the relay S closed, which is about Contact i8s puts in a holding circle. Furthermore, ain contact 2 ~ i the surge receiving relay L - severed from the superior vein. For the The duration of the last current impulse series becomes L through Relay I 'held in contact iv on. After choosing the individual numbers of your own The subscriber must enter the call number by entering speaking character transferred to] 'on it made aware. his hear- hang up what in the 1Ziicl, # call device the drop of the relay C and the triggering of the group filter 1. GII 'i and the I'II'i result (see Fig. i). Control stepping for relay C (K (open intact 8 c) the loop between the speech wires Maintain relay S at contact gs. (Before- courses that precede «-'alil of the last digit in the case of waiver on the further establishment of the connection the impulse generated when the receiver is hung up harassing calls from other participants could lead to, through appropriate measures lines, for example due to a considerable Zttgslaguiig the relay S. prevented.) By Opening the contact 26c is the holding circuit for the relays I-12 and I1.1 open. The connection from negative potential to the storage relay Resistance TI-i 2 becomes after opening the contact -1111.4 maintained by contact for 12s. After closing the contact 78c is for the Capacitor C () 2 following charging circuit closed: earth. Contact 78c, winding of the lais 1st contact 771-, capacitor C02, contact 65 ei, wickhing 1I of relay Z i, minus. That while the capacitor C02 is charging corresponding relay 1 transmitted by opening the Contact iii your lead wild lit, '2 den first impulse of the stored stroke line At the same time the relay Z i is dropped because the winding 11 of this relay of its winding I is opposite. The holding circle of the relay # Z i. «Declaration 1 via contact .13z i thus becomes interrupted. After charging the capacitor Co2 or after relay K has responded Relay I off again, so that the one to the line the pulse sent to the selector is terminated. LTber con tact 79i relay K is switched on, which the l-Zontakt 76l = closes and with it the discharge of the capacitor C02 via the resistor. II'i 1 brings about. After the relay K and Closing the contact 771, - is for the con- capacitor Co-2 formed a new charging circuit, the now via contacts 66N i, 67--2 and counter- winding 1I of relay Z2 runs. Relay 1 sends the next pulse to the line selector, while the relay Z 2 is brought to waste and the holding circuit is released via contact 45z2 will. l .: Her contact 79i is, again relay K switched on, the discharge via contact 76l, ° of the capacitor Co-2 brings about. After waste of relay K is activated for capacitor C02 new loading circuit closed, the Tiber the hon- bars 66 z i. 6,9z2 # 7173 and counter winding 1I of relay Z3 runs. Relay Z3 is made to drop, while 1 transmits the next pulse to the line selector. The series of counter windings in the Z relays is only partially indicated. The windings 11 of the relay Z.1 to Z8 are not shown. If the last series of impulses consists of ten pulses, after the eighth pulse the counter-winding 1I of relay Z9 is switched via normally closed contacts of relay Z and contact 73-9 and after the ninth pulse the counter-winding of relay Z io via contacts 7- 1--9 and 7.5-10 switched on.

The size of the capacitors is chosen so that the Z relays are switched on by Co i and the switched on Z relays are tapped off by C o2 in conjunction with relay K in a sequence corresponding to the normal current impulse.

If the current surges for setting the line selector are sent out through contact ii z-, the devices for ringing current transmission in the line selector are activated in a known manner, so that the subscriber's alarm clock is switched on. The subscriber can cancel the call by picking up and replacing the handset. However, arrangements are provided. which automatically switch off after a certain call duration. After relay C dropped out, thermal relay TIa was switched on: earth, contacts i8 s (or igw i), 2117, 22S1, thermal relay Tlz, minus. After a certain time, the thermal relay closes contact 351h and thus a circuit for relay Si. which is placed in a holding circuit via contacts 34s1 and 37s. The thermal relay is switched off by contact 22S1. After a certain cooling-off period, the contact 36th is closed and the counter winding II of the relay S is switched on via contacts 38 s and 39 si. Relay S drops out and opens the loop between the speech wires at contact g, s. This gives the signal to trigger the following connection devices, and all parts of the call-back device are also brought to the rest position. The RRE call-back device is made available again via contact i.1s.

If it is required that the control call is chargeable for the subscriber, after dialing the last digit through the then responding relay S, a contact is switched on for 3 s via resistor U'i i, 'Minus to the lower speech wire, whereby the group selector I. GW i responds to the counting relay which, after hanging up the phone, causes the subscriber counter to switch.

Claims (1)

PATENT CLAIMS: i. Circuit arrangement for checking operational readiness of partial line connection devices, characterized in that from a subscriber station emitted current impulse series corresponding to the own connection number from a facility located in a special connection path (callback facility RRR) are controlled in such a way that the last rush series, - preferably the last series of current impulses, saved and only after the subscriber station has given the final signal for the purpose of completing their connection (through LItj2) or will. Circuit arrangement according to Claim i, characterized in that the last Digit corresponding to the connection number current impulse series by one in the callback facility arranged relay group (Z i to Z io) is stored in such a way that one Number of relays in the relay group expressed by the last digit being affected. 3. Circuit arrangement according to claim 2, characterized in that that after the registration of the indicator (drop of the relay C) for the final signaling the subscriber station counter windings (11) of the storage relays (Z i to Z io) tapped -be and at the same time the number of affected storage relays corresponding current surges generated and transmitted to complete the establishment of the connection. Circuit arrangement according to claim 3, characterized in that the taps in one of the normal Current impulses can be made according to the rhythm. 5. Circuit arrangement according to claim characterized in that the rhythm is determined by the size of a capacitor (Co2) the counter windings of the storage relays are placed one after the other in its charging circuit and a relay (K) controlling its charge and discharge is determined. 6. Circuit arrangement according to claim i, characterized in that after recording or transmission of the series of current impulses corresponding to the last digit of the connection number time switch devices (Th) are made effective by the call-back device, which, after a certain period of time, is triggered by the callback facility Establish a completed connection. 7. Circuit arrangement according to claim i, characterized in that after receiving or sending the last digit the connection number corresponding impulse series by the callback device switching operations (Connection of minus to the lower speech wire) to influence the participant counter being controlled.