DE3102691C2 - Circuit arrangement for the remote-controlled switching of a special service subscriber circuit in telephone systems - Google Patents

Description

g -

freely selectable genv

This task is solved by the fact that? the special service subscriber circuits assigned to the subscribers taking advantage of the special service are connected in parallel to their switching inputs that can be occupied by the dial test network and each contain a call number memory which records the last (n) digits of a call number dialed via the dial test network and with a or compares several digits stored in a read-only memory \ o so that only that special service subscriber circuit which matches is established in such a way that after a positive control connection, the switching device controlled by the switch with a special identifier is influenced.

With the invention it is achieved in an advantageous manner that similarly configured special service subscriber circuits can easily be adapted to local conditions. Because they have little space claim, they can easily be accommodated anywhere in a modern switching system will. For all in an exchange Special service subscriber circuits, a common adaptation kit is provided that only has the task of the inputs of the special service subscriber circuits to adapt to the upstream output of the dial test network. This adjustment rate can be simplified even more if the upstream electoral stage of the dial test network already has Identifier supplies directly from the special service subscriber circuits can be processed.

An exemplary embodiment of the invention is explained in more detail below with reference to drawings

F i g. 1 the basic connection of special service subscriber circuits according to the invention,

F i g. 2 the basic structure of the ANS adjustment kit,

F i g. 3 shows the principle of a special service subscriber circuit according to the invention.

When Aufoau a switching connection over the network Wählprüf WPN the adjustment rate ANS of the last group selection stage Prg Wdes Wählprüfnetzes occupied. It speaks in a known manner to relay C (Fig. 2) via the c-wire. The dialing pulses that then arrive (earth pulses on the a-wire) are picked up by relay £ and passed on to the special-service subscriber circuits on the a-wire. This is where the series of dialing pulses go into the telephone number memory R-Sp (FIG. 3). After each series of dialing pulses, the control device MC checks whether this corresponds to a switching number for a special service subscriber circuit stored in a read-only memory PROM-R. This can be the case with single-digit or multi-digit selection, depending on which switch numbers are stored in the read-only memory PROM-R . If a match between the selected switch number and the switch number stored in the read-only memory is found in one of the special service subscriber circuits, the switching means X is temporarily switched on there. The switching means X shown here as a relay can of course also be designed electronically. As a result, a ground pulse is placed on the fr wire, which means that the switching means Dans in the ANS adaptation set.

This creates a + 60 V pulse through the fr wire to the Wählprüfnetz W / W wide *, which is a code

60

65 chen is requested, with which it is ensured that changes in the special service subscriber circuits can only take place from authorized offices. The authorization to carry out a switching action is identified by the code "Call, voltage simultaneously pn, β and fr-wire". This indicator is received by the switching means T and H in the adaptation set ANS . First, the switching element Fan speaks over the a-wire, which connects the switching means // to the fr-wire. When H responds, D is thrown off and an earth pulse is sent to the fr-wire as an acknowledgment signal. The switching means implemented here as a relay // remains in the activated state via its Z winding depending on the occupancy relay C. With the contacts h 1 and h 2, a / b wires are switched through to the special service subscriber circuits.

After the above-described earth pulse has been emitted on the FR wire from the special service subscriber circuit, one of several TV audio amplifiers is switched through from there, whereby an audio frequency is switched through to the speech wires depending on the switching state of the respective switching means u. This audio frequency now reaches the switching point via the adjustment set when switching through the Α-contacts, so that the operator can determine the switching state prevailing in the activated special service subscriber circuit.

A control connection to the special service subscriber circuit is now set up from the switching point via the public telephone network (ÖFN in Fig. 1). For this purpose, the normal call number of the subscriber whose special service subscriber circuit is to be switched is dialed.

In this way it is checked whether the correct special service subscriber circuit was reached in the connection established previously via the dial test network. Therefore, after the end of the dialing, when the ringing tone sounds, a special switching indicator is sent from the switching station via the dialing test network, which reaches the security service subscriber circuit and there enables the reception of the incoming ringing current from the line selector LW of the public network.The details required for this are in the drawing not shown because they do not belong directly to the invention. Likewise, not shown, as will be simulated after receipt of the ringing current by SchleifenschluB the wires a 1 and fr 1 a subscriber message, so that a call through-connection is performed simultaneously with this switching operation, as before, one of the audio amplifier TV described turned on, so that now a special sound through the dial test network is transmitted backwards. The operator at the switchboard recognizes from this tone that the correct special service subscriber circuit has been reached.

The control device MC of the special service subscriber circuit stores this state and is now ready to record switching indicators for actually carrying out the desired switching measure. The switching means U \, U2 , shown here as stick relays, are now controlled in the following manner. From the slot, one of several possible switching indicators is key-controlled via the dial test network and passed through to the adaptation set. According to the type of identification, receiving switching means, here relay B, are included in the adaptation kit

and Λ /, arranged on the £> wire. However, it is too any other type of identification, for example by means of audio frequencies according to the known multi-frequency method, is conceivable.

The adaptation set ANS contains a conversion device US, which converts the switching indicators received in parallel into pulse series in a known manner and thus controls the switching means E, which is designed here as a relay. As a result, the license plates issued by the slot reach the special service subscriber circuit in the same way as the dialing pulses described above.

On the basis of the incoming series of pulses, the control device MC of the special service subscriber circuit can recognize which switching measure or which feature is involved. For this purpose, the series of pulses or several series of pulses now present in the call number memory R-Sp is compared with your SpciCMcnnhali cimcS fricrkms'spCichcrS Ki-Sp. * R One of the switching means t / l, t / 2, which are shown here as a latching relay, is switched on or off depending on where in the feature memory M-Sp a match was found between the stored content and the content of the call number memory R-Sp .

The contacts u \ and u2 are arranged in the drawing, for example, in the voice wires so that either the special service subscriber circuit is connected to the subscriber station T or the subscriber station can be switched off when the switching means υ 2 is activated. If only the switching means u 1 is in the activated state, so can regardless of outgoing connections from the Subscriber station Tau can be established or calls are accepted. It just happens a parallel connection to the telephone order service or an announcement device that is in function occurs when an incoming call is not answered.

However, the subscriber station can also be switched off completely or partially (only effective in the outgoing direction), for example if the subscriber has not paid the telephone charges due. For this case, the circuit arrangement is suitable if further in the event of partial shutdown with \ ·> contacts or switching means in the normal line circuit TSeingegriffen is.

The switching back of an initiated switching state is carried out as already described vvis uuS initiation of a Schu! Trf? Kßri2hrf! £ Π0711 cjnH only to assign the corresponding different switching indicators, which are converted into pulse series in the adaptation set ANS. In this case, the special service subscriber circuit is not necessarily tied to a decadic impulse, but could also receive and process more than ten impulses within a series. This could e.g. This makes sense, for example, if the switching indicators are transmitted according to C.-r.em, a method similar to the known diode-earth method, which offers up to fifteen possibilities, or according to the known multi-frequency method with up to sixteen possibilities.

For this purpose 3 sheets of drawings

Claims (5)

Claims; 1.Circuit arrangement for the remote-controlled switching of a special service subscriber circuit in telephony, with a so-called holding connection to a special service subscriber optionally assigned to a special service subscriber being established from a switch station set up for this purpose via a so-called dial test network and then checked by setting up a control connection via the public telephone network whether the correct special service subscriber circuit has been reached in which a switchover is to be made, characterized in that the subscribers making use of the special service (Ti-TnJ assigned special service subscriber circuits (So-TSi-So-TSn) at their from Wählprüfhetz (WPN) assignable switching inputs (SE) are switched paratid and each contain a call number memory (R-Sp) , which records the last (n) digits characterizing the respective subscriber (s) of a call number dialed via the dial test network and with an ode r compares a number of digits stored in a read-only memory (PROM-R) so that only the special service subscriber circuit (So-TSi-So-TSn) where a match is established is set in such a way that, after a positive control connection, this occurs from the slot Switching means (i / l, i / 2) controlled with a special identifier is influenced. 2. Circuit arrangement natn claim 1, characterized in that special service subscriber circuits connected in parallel (So-TS 1 - So-TSn) are preceded by a common adaptation set (ANS) which is adapted to the output of the last selection stage of the dial test network (WPN) and contains a conversion device (US) , with which the special identifiers issued by the slot are converted into pulse series. 3. A circuit arrangement according to claim 1, characterized in that the number of special service subscriber circuits connected in parallel (So-TSA-So-TSn) is freely selectable, and that the digits used to control a single such subscriber circuit can be set as desired. 4. A circuit arrangement according to claim 2, characterized in that as a series of pulses in the special service subscriber circuit (So-TS 1 - So-TSn) incoming identifier of the slot are also recorded in the call number memory (R-Sp) , but only in an activated special service - Subscriber circuit (SO'TS 1 - So-TSn) can be compared with the content of a feature memory (M-Sp) , the switching measure being carried out in which a match was found. 5. Circuit arrangement according to one of claims 1, 3 or 4, characterized in that a microcomputer ("AiQ" is used for controlling the testing and switching processes in the special service subscriber circuit (So-TS 1 - So-TSn). Pie invention relates to a circuit arrangement for remote-controlled switching of a special service part Telephone calls, whereby from a switch plate set up for this purpose from above so-called dial test network a so-called switching connection to a special service subscriber circuit optionally assigned to a telephone subscriber and then through the establishment of a control connection via the public Ferusprecb network is checked whether the correct special service subscriber switching has been achieved in which a switchover should be made In fully automatic telephone networks, it is not sufficient in all cases to give the subscribers the To enable the establishment of local and remote connections by self-selection, which when reporting the called subscriber are automatically switched through. It is part of the service provided by the operator of Telecommunications networks that the participants can choose Special services can be provided. One of the best-known special services is the telephone order service, whose function is in the instruction sheets of the Deutsche Bundespost (Issue B, No. 1.26. Year 1973) from pages 15-28 is The main purpose of the telephone order service is to inform a caller when the The subscriber cannot answer the call himself. But it can also be from operational Be interested in an announcement informing callers when a connection cannot be reached or the number has changed. For these and similar cases, as well as for the telephone order service, it is known to concern the participants a so-called special service part to assign receiver circuit, with their connection mostly at the main distributor in the switching system is made. With this connection, however, there is only the possibility of a special service set up. The activation of certain features for this participant is then carried out by a so-called Slot made by remote control, with a so-called switching connection via a dial test network the desired subscriber circuit who the must. How this happens in detail is in the previously cited literature is described in detail. So there is on pages 15 and 16 under point 2.2 explains how a switching connection is established via the dial test network. The final choice so the desired special service subscriber circuit is thereby by a so-called switch selector made, which can be set using the last two dialing digits and thus offers the option of 100 To control special service subscriber circuits. the The capacity of the selector is therefore only at larger exchanges can be used. In smaller exchanges with only a few special service subscriber circuits, it does not make sense to use such a selector switch, because in general for actual expense of this switch selector nor a selector frame or a correspondingly designed one Voter rack must be available. The object of the invention is to make this switch selector universally usable by a simple one To replace device which is applicable everywhere regardless of the number of special service subscriber circuits. The final digits for one over that The switching connection to be selected should be selected