DE875958C - Circuit arrangement for telephone systems with dialer operation and several exchanges - Google Patents

Description

Circuit arrangement for telephone systems with dialer operation and several Switching centers There are circuit arrangements for telephone systems with dialer operation and several exchanges known, at which the calling subscriber the Has his choice, especially when calling participants from other exchanges Select connections yourself or these from a special exchange to have produced. This particular exchange is in a centrally located one Office arranged and is by the participants of this office and those in contact with it standing exchanges by dialing a special number and provides then establish the desired connection. For example, in a network group, which consists of end and node offices and a main office, the special exchange assigned to the main office.

To simplify the recording of charges in such systems it is expedient if all charges in the network group, regardless of whether, the connection was set up by the subscriber himself or whether he did it through the special exchange produced by the same facilities (time zone counters or slip printers) can be detected. This has the advantage that the job of the placement officer merely relates to the establishment of the desired connection, so that the workplace after the Connection can be switched off because Counting and monitoring takes place automatically.

Such an arrangement requires that from the special exchange to establish the connection sent out series of impulses not only the structure of the Cause the connection, but also the fee recording devices (time zone counter, Ticket printer), as they are used to select the desired self-serving series of current impulses to determine the zone in the charge recording devices required are. If the charges are recorded by automatic call slip printers, the number of the desired subscriber must also be registered. If so For example, the subscriber of an end office is the switching center housed in the main office calls and wishes to establish a connection, the officer must .Emitted current impulses are effective once in the direction in which the connection is established on the other hand also backwards via the line between end office and main office to the billing device housed in the end office. .

Difficulties arise here, especially if in the usual way Way inductively coupled connecting lines operated with alternating or audio frequency current can be used, via which all control and setting processes are carried out with a uniform Type of current are transmitted. It is known that there are power surges of different duration so z. B. short for the vacancy message, long for a busy message, and The called subscriber can also hang in and out with short or long power surges transferred to. These different responses are sufficient for all connections, which are set up by the .participant himself, since they are always in a certain Order and thus clearly differ from each other. Difficulties arise, however, if the feedback mentioned above is also added Backward series of current impulses for influencing in hand-switched traffic of the fee collection devices come into question. If z. B. when free of the desired subscriber a short power surge is sent backwards, so would a single election surge, i.e. 'the digit i, will take effect in the same way. So it must. Facilities are provided which are capable of; clearly to distinguish between elective surges and the other feedback.

The invention solves the problem posed here in a simple and economical way: in that the series of current impulses emitted by the particular connection point in the direction of the connection origin, which influence the charge recording device ZD located between the connection point and the calling subscriber, receive an additional current impulse and that switching means V, W, H, R, K prevent an 'effect' of the first 'current impulse of a received current impulse series running in the direction of the origin of the connection on the charge recording device, while evaluating a received feedback in the form of a single current impulse according to its significance and / or forward.

The arrangement according to the invention is explained with reference to the figures. Fig. I shows the basic structure of a telephone system with several exchanges, Fig. Z the arrangement of a fee recording device; as far as this is for understanding of the invention is required.

The embodiment shows the facilities for a system at which all signals intended for the calling subscriber in his L GW are switched on and in the event of an occupancy an immediate triggering of the established Connection takes place.

Desires z. B. the subscriber T i (Fig. I) of the end office EA a connection with the subscriber T: 2 of the node office KA, he is connected to a free I. GW after hanging up by the caller AS and reaches in the usual way after Choice of a traffic disaggregation digit, e.g. B. K (o)., A free connection line VZ i, which leads to the node office K A. In a manner known per se, a continuous connection from the end office EA to the main office HA is immediately established in the node office KA by a selector VW, so that the second line of impulses sent by the calling subscriber sets the group selector HGW of the main office: Simultaneously with this Second series of impulses is operated in the node office a follow-up mechanism MW, through which, when the code number of the node office is selected, a line selector LW of the node office is occupied by the selector IW while at the same time releasing the connecting line VLa leading from the node office to the main office. The desired subscriber T 2 is reached via the line selector LW through the further series of current impulses.

If, however, the subscriber T i wants to have the desired connection established by the special switching center (VSt of the main office), he selects, for example, also o in the second place, whereby a selector DW is set in the main office, which connects the subscriber to the switching center VSt causes. At the same time, the group selector HGW is triggered and returns to its rest position, so that it is available again for the further establishment of the connection. As soon as the official at the exchange starts making the election, the power pulses sent are used once to set the HGW and at the same time go backwards via the connecting lines 1L 2 and VL i to the charge recording device GW of the end office, from which they are transmitted to the ZD slip printer. In addition, this backward-sent series of rushes influences the follow-up mechanism MW of the node office and causes the selector JW to be set to a free line selector LW, via which the desired subscriber T2 is then switched on.

Was a connection with a subscriber of the main office or a If you wish to use this other office that can be reached, the change of direction will not take place in the node office, and the connection runs through the main office's HGW.

Fig. 2 now shows, as an exemplary embodiment, a fee recording device GE, which is connected, for example, to a slip printer. The GE is assigned via line c, with relay C responding. The relay M is excited by the contact ci via the switching arm MWa of the follow-up mechanism MW. The series of current impulses sent by the subscriber influence relay A via line a and are transmitted to the continuing line ä through contact ai. At the same time, the current surges through the contacts a5 and r4. and the line J is passed on to the slip printer ZD, in which the dialed digits are printed. The relay V is energized by the contact a2, which has a drop-out delay and remains attracted during the individual series of current impulses. During the first series of current impulses, the rotary magnet DM of the traveling mechanism MW is excited via the contacts a.3 and mi and continues to control its switching arms step by step. At the first current surge, the switching arm M interrupts the switch-on circuit for the relay M. However, this has a dropout delay and is maintained during the series of current impulses via contacts vi, m2 and c i. The rest step of the switching arm MWb is bridged by the contact c2, so that the relay C remains energized. After the end of the first series of impulses, the relay V drops and then also the relay M, the circuit of which was interrupted by the contact vi.

If the subscriber wishes his connection to be established by the special switching center, he dials according to the traffic decision number o, so that the switching arm MWa of the follow-up mechanism MW is on step io after the selection has ended, so that after the relay V has dropped out via the contacts ci, MWa step io, m3 and v, 2i the relay H is energized and a holding circuit closes via the contacts hi, wi, a4 and ci, via which it remains energized after the relay M has dropped out and the contact m 3 opened.

If the particular exchange is free, a short backward current surge is given via line b ', by means of which: relay B is briefly actuated and when it is triggered via contacts h2 or k i, b i and xi, relay Y is energized. At the same time, a corresponding current surge is given by the contact b: 2 over the line b to the I. GW and causes the activation of the dial tone for the calling subscriber in the same. When the current surge is over, relay X responds via contacts h2 or k i, b i and yi, while relay Y is kept in the same circuit at the same time. If the officer reports to the exchange, a second current impulse is given over the line b ', through which the relay B responds again, the current impulse with its contact b 2 passes on through the line bi and de-energizes with its contact b i Y , while the relay X is kept energized via the contact xi and its winding II until the end of the current surge. The relay X has a small drop-out delay, so that after the drop-out of B via the contacts ci, b2 and x2, the relay G responds, which binds to its contact gi and connects the speech lines with its contacts g2 and 93. The contact h6 prevents the ticket printer ZD from being influenced via the contacts b3, x, 4 and the line Z, so that for the time being no billing takes place.

If the calling subscriber has announced the call number of the desired subscriber to the exchange officer, this begins with the establishment of the connection, from which, however, a short current surge is sent back via the lines ä, b ', through which the relay B responds via its winding II . The contact b 2 interrupts the holding circuit of the relay G, which however has a short drop-out delay, so that the relay K responds via the contacts ci, b2, g ¢ and h3 , which is via the contacts ei, a.6 or v3, k2, and h 3 binds.

After relay G has dropped out, relay B remains energized via line b ' and contacts ä 3, r i and its winding I until the end of the current surge, and after it has dropped out, contacts ci, b2 "k 3 and hq. the relay R is switched on. The circuits for the relays X and Y are interrupted by the contacts k i and h: 2.

According to the invention, the series of current impulses sent out by the special exchange have one current surge more than required for each current impulse series, which current impulse must be suppressed in order to enable the charge recording devices to be set correctly. The current impulses are, like all backward running criteria, given via the line b 'and excite the relay A via the contacts 93 and ri, which is switched off by the contact r2 of the incoming line a. The contact r3 makes the contact ai ineffective.

At the beginning of the first current impulse, the relay V is excited by the contact a2, while the contact a5, since the contact r q. moved and the contact w2 is not yet closed, remains ineffective. When relay A drops out for the first time, contacts a2, r5 and v4. the relay W is energized, which also has drop-out delay and does not drop out during the individual series of current impulses. The following current surges are now transmitted via the contacts a5, r4, w: 2 and the line J to the slip printer ZD and registered there.

The relays H and K also have a drop-out delay and remain on during the individual series of impulses via the contacts a4. or a5 excited. If the dialing process is finished and the desired participant is free, the line selector sends out a current impulse via line b ', which in turn energizes relay A , which switches on relay V with its contact a 2, so that after dropping of A via .the contacts a 2, r 5 and v4 also the relay W responds. Since it is only a single power surge, it is not transmitted to the ZD slip printer. The holding circuit of the relay H is now interrupted by the contact wi, and since the relay W only drops out after the delay relay V, the relay H drops before W and interrupts its holding circuit with its contact hi. Through the contact hq. the relay R is de-energized, and this drops with a dropout delay of about 60 to 80 m / s behind the relay H, so that a corresponding current impulse is given to the winding I of the relay B via the contacts r 3 and h 5, which speaks briefly. The contact h 3 also de-energizes relay K, but its contacts remain ineffective: Contact b: 2 sends a short current surge with plus to line b and causes the dial tone for the calling subscriber to be switched on in the I. GW. Relay Y is energized via contacts h2, -bi and xi when relay B responds and relay X is energized via contacts h 2, vi and y i when relay B is released , and relay Y is kept in the same circuit. If the called subscriber reports, a current surge is given via: the 'line b', which is excited via the contacts g 3 and ri Idas relay B and passed on through the contact b: 2 to the 1st GW. The relay Y is de-energized by the contact bi, while the contacts bi and xi X remain energized via its second winding for the duration of the current surge. Via contacts h6, b3, xd. and the line Z is the posting message to the slip printer ZD and causes the start of the call time monitoring. After the relay B has dropped out, the contacts ci; b 2 and x ?, the relay G energized, which binds itself with its contact gi and switches the speech lines through with the contacts g2 and 93.

If the called subscriber was found occupied, a long current surge is given over line b 'or plus is continuously applied so that relay A responds via contacts 93 and ri, which energizes relay h with its contact -a2. The relay K is de-energized by the contacts a6 and v3, which drops out after about 150 m / s and switches off with its contact k 3 R, which also drops out. Through the contact r i, the relay A is de-energized and the relay B is connected to the line b ', so that this now responds and with its contact b 2 plus puts on the;, line b to the I. GW. The connection is now released from the L GW and the busy signal is transmitted to the calling subscriber. The processes involved in triggering are irrelevant to the invention.

The arrangement according to the invention is not limited to the exemplary embodiment, but it can also be used with advantage in other places, such. B. be arranged in the connection device of a node office (KA according to Fig. I) and serve there to control the follow-up mechanism MW, since in this case also a current surge must be suppressed from each current surge series sent by the special exchange and also individually incoming current surges, such as Free or busy message; must be passed on according to their importance.

Claims (3)

'PATENT CLAIMS: i. Circuit arrangement for telephone systems with dialer operation and several exchanges in which the subscribers can both establish connections themselves as well as have them set up by a special connection point, characterized in that the current impulse series emitted by the special connection point in the direction of the connection origin, which the in an between The platform detection device (ZD) arranged by the connection point and the switching center located at the calling party, receive an additional current surge and that the switching means (h, W, H, R, K) have an effect of the first current surge of a received series of current pulses running in the direction of the origin of the connection on the charge recording device prevent, on the other hand, evaluate and / or forward a received feedback in the form of a single current surge according to its significance. 2. Circuit arrangement according to claim i, characterized in that switching means (H, R) are provided which when If a single short current surge arrives, a corresponding one is passed on Cause electric shock. 3. Circuit arrangement according to claim i, characterized in that that switching means (K, R) are provided, -which when a long current surge occurs or a continuous message is the transmission of a long power surge or a continuous message cause. 4 .. Circuit arrangement according to claim i, characterized in that switching means (Mitlaufwerk MW) are provided which. the circuit arrangements according to claim -. to 3 only take effect if the calling subscriber has received one specific digit or sequence of digits was selected. Printed publications: German U.S. Patent No. 577,226; U.S. Patent No. 1,563,631.