DE3517017C1 - Circuit arrangement for telecommunications switching systems with direct dialling-in - Google Patents

Abstract

The subject-matter of the application is a circuit arrangement for telecommunications switching systems with direct dialling-in for the forced identification of every calling subscriber, even over a plurality of exchanges. It contains a caller-end functional unit A which comprises a central unit ZE allocated to a plurality of first group selectors I.GW with a microprocessor controlling the transmitter NS for the caller number and a read memory for the fixed part of the caller number and a read/write memory for the different last two digits of the caller number. To identify the last two digits of the caller number, pulse-receiving devices IMA1 and IMA2 are provided on the rotary arms of the allotters 1. and 2. AO leading to the motors of the first and second line selectors AS. In the local exchange of the called subscriber, a functional unit B is located which, in the event of incoming line seizure, transmits an audio-frequency proceed-to-send signal to the functional unit A. It is received by an audio receiver TE and thereupon, by means of the transmitter NS, the telephone number of the calling subscriber and its local code which is likewise permanently stored in the read memory are transmitted via the speech wires to the functional unit B, which receives the caller number and stores it for display. <IMAGE>

Description

Such a circuit arrangement is known from DE-OS 33 26 979. It is proposed there to give each voter of the first group election stage the functional unit (A) permanently assigned and there the area code and the fixed part of the phone number to store in a one-time programmable read-only memory during the different Part of the call number after receiving a call character from the functional unit (B) determined by a diode matrix and written into a read / write memory whereupon the contents of both memories are sent to the functional unit by a transmitter (B) be transmitted in the incoming end-office switch. Furthermore is here even already provided during the transmission of the call number Separate speech lines to the caller in order to prevent manipulation on the part of the caller.

The formation of the functional unit (B) in the coming exchange is not critical here, since it is only available in the participant facilities of such participants must be installed who want this service and pay a fee for it. They are also not interested in manipulating the phone number they have received.

In order to be able to offer the service at all, the network operator must make a significant advance payment, namely the functional unit (A) in all To install end exchanges on all first group voters and all participants to be connected to this functional unit via diode matrices.

With currently 25 million participants in the Federal Republic of Germany that means a considerable effort for the Deutsche Bundespost.

Another method of subscriber identification in telephone switching systems is known from DE-AS 28 20 972. Here is the number of the calling party transmitted to a central monitoring and reporting point by means of audio frequency signals and displayed in a registration device. To determine the calling party an identification device is provided which - under the control of a microprocessor - with each new occupancy that is recognized by the c-core, all individual subscriber Scans connection points. So here are all the participants in the To connect the identification device.

DE-AS 22 60 023 provides a circuit arrangement for visualization the telephone number of a calling party on the telephone set of the called party Known to the participant. It consists of a transmission device, which is in a centrally controlled switching center is installed, and from a receiving device, which is installed at the participants who want to use this service.

The transmission is done by modulated voice frequency signals, for which a separating filter is provided in the receiving device. The use of the known circuit arrangement is limited to private branch exchanges that have have a central exchange.

The invention is based on the object of a circuit arrangement of the type mentioned above, the effort primarily for the entirety of the functional units (A) decrease.

This object is achieved by the features specified in claim 1.

By dividing the functional unit (A) into a central unit and Pulse pick-up is achieved by having a large number of first group selectors only one central unit can be assigned. The arrangement of the impulse pick-up devices to the call folders means a further significant reduction in the workload such as prove the following figures.

End exchanges are always set up in blocks of 2200 groups. A 2200 group consists of 22 hundreds groups. Every hundreds group are normally three call seekers (ASg) and, each leading directly to a group dialer five first call seekers (1st AS1 the second call seeker (II. AS) to group dialers lead, assigned.

Participants who make a lot of calls will i. a. in groups of hundreds summarized, the more ASg contain- ten, namely 7 or 19 ASg. A typical mix of 2200 participants consists of 15 groups of hundreds, each with 3 ASg, and 6 groups of hundreds with 7 ASg each and 1 group of hundreds with 19 ASg; there are also 5 1st AS per group of hundreds. A total of 216 ASg and 1st AS are accounted for by this mixture. They are in 9 rack frames each housing 24 AS, and two call folders belong to each rack frame. The 110 1st AS lead to 44 2nd AS, which are housed in two rack frames, again with two call folders each. For this block of participants you come with the Subject of claim 1 with a central unit and 22 pulse pick-up devices the end.

The effort is therefore considerably reduced compared to the prior art.

Advantageous further developments of the invention are set out in the subclaims marked.

The invention is illustrated below with reference to the in the drawing Embodiments described in more detail. It shows F i g. 1 is a block diagram of the circuit arrangement according to the invention, FIG. 2 an exemplary embodiment for a pulse pick-up device, F i g. 3 shows an exemplary embodiment for a central unit, FIG. 4 shows an embodiment for a subunit separate from the central unit, FIG. 5 the design of the functional unit B, F i g. 6 shows an excerpt from FIG. 1, which is an extension contains which the arrangement for taking over the billing and for counting comparison makes usable.

F i g. 1 shows in the left and upper part facilities of the existing one EMD system, namely a call seeker AS, which can be a 1st AS or an ASg, where a 1st AS would be followed by a II. AS, the local line transformer OELS, the first group selector L GW, which is followed by further group selectors further transformer and the line selector LW its outputs via the main distributor HVt are led to the participants on the B-side. There are 24 call seekers AS at a time controlled by two call folders 1. AO and 2. AO. A 2200 group are more typical Mixture - as already mentioned - assigned to 11 1st AO and 2nd AO each. To each of these The call folder is coupled to a pulse pick-up device, to the 1st AO in each case the impulse pick-up device IMA 1 and on the 2nd AO the impulse pick-up device IMA 2, both on its engine and on one of its rotating arms. Any pulse pickup device takes the respective motor steps of both the call folder and the Rotary arm of the call folder accessible call finder. The received impulses could be forwarded directly to a central unit ZE and there in information about the respective position of the two call folders and the one controlled by them 24 call finders can be converted. But there are considerable transmission routes in between can lie, it is safer from the recorded pulses in the pulse pick-up device even derive and store the position of the switching elements. The two impulse pick-up devices IMA 1 and IMA 2 are even appropriately connected to one another here and swap over this connection their data with each other, so that the information about the position both call folders and the call searchers controlled by them are duplicated and can also be transmitted in duplicate to the central unit ZE, if there is a request from there.

The central unit ZE constantly scans by means of a fast scanner So; which can be set up electronically, all I. GW of the assigned, a block corresponding to a 2200 group, one point at a time in the Wiring of the I. GW, in which a potential jump occurs when occupied, that would be z. B.

on a c-contact As soon as it recognizes a new assignment, requests they use the pulse pick-up devices IMA 1 and IMA 2 to transmit the signals there in the meantime determined position of the call seeker, from which the last two digits of the Call number of the calling subscriber emerge. Furthermore, she lays over a Multiplex device MXE a sound receiver TE to the relevant I. GW. if from the functional unit B the call signal arrives at the sound receiver TE, switches calling the central unit by means of a relay Tden provided for each I. GW Subscriber Tin A from the speech cores and puts on a number sender NS, the - preferably with frequency shift keying - the one permanently stored in the central unit Area code, the part of the phone number that is permanently assigned to the relevant I. GW and is thus also stored and the information provided by the pulse pick-up devices IMA 1 and IMA 2 determined last part of the call number for the called subscriber Tln B respectively.

whose exchange transmits.

Sound receiver TE and number transmitter NS as well as the switching means for the Relays T are in themselves part of the central unit ZE. But then you have to do it several times be available there, since the control in the central device is significantly faster works as the connection establishment, the receipt of the polling character and the transmission the number lasts. Therefore, these arrangements are here for the sake of clarity combined into subunits UE. A block comprising a 2200 group contains as many I. GW as ASg, i.e. typically 106; there are also 44 I. GW, those via II. AS can be achieved.

For these 150 I. GW it is advisable to provide 10 to 15 subunits UE. The multiplex device MXE can be a selector, a relay switching network or a controllable switch, but for the creation of the sound receiver and the number transmitter must be designed as an analog switch.

In Fig. 2, the structure of a pulse pickup device is shown. Its core is a microprocessor 2-4, which is equipped with a read / write memory 2-5 and a one-time programmable memory 2-6 is provided. Optocoupler 2-1 the impulses controlling the motor of the call folder AOI attack its motor coils M11 and M 12 and lead them via an exclusive OR logic element 2-3 dem Microprocessor 2-4 too. The same applies to the impulses for the rotating arms (in two levels) of the call folder reached motor coils M 1 and M2 of the call folder controlled call seeker AS removed by optocoupler 2-1 and, again in one Exclusive-OR logic element 2-2 linked, fed to the microprocessor. the Due to the special control of the motor coils, an exclusive OR link is which energizes both coils to quickly stop the switching elements, necessary. The microprocessor 2-4 counts the number of each executed by the call folder Steps and adds them to the previous ones he has in read / write memory 2-5 contains. So he knows which of the 24 call seekers the call folder AOI is currently selected has, in the example on lamella 17. The microprocessor takes the number of steps also and adds them to a previous one in the read / write memory stored value and thus arrives at the step position of the call seeker, which the are assigned to the last two digits of the phone number, in the example 37.

After the call folder and call finder have been shut down, the read / write memory contains 2-5 the in F i g. 2a, the addresses 1 to 24 being the call seekers and addresses 1 and II are assigned to the call folders. In the case of the applied In the incremental process, a synchronization process is carried out each time the 0 contact of one of the switching elements is swept over. Reaching the 0 contact triggers an impulse that stores the entry in memory 2-5 either for the relevant Call finder or for the call folder is set to 0.

One in the going direction as a parallel / series converter and one in the coming direction Direction as a series / parallel converter acting block 2-7 sets this from the central unit incoming request signal into a signal to be processed by the microprocessor 2-4 and the data supplied by the microprocessor 2-4 into transmittable signals. Three transmission lines are useful here, one each in the forward and backward directions acts, while the third represents the reference line.

F i g. 3 represents the pure control expression of the central unit without the to be connected sub-units. The from the pulse pick-up devices IMA 1 ... IMAx (x = typ. 22) supplied information, which in itself i. a.

only the position of the requested caller, not the call folder, are transmitted in two ways, in separate channels, for security reasons Series / parallel converters 3-1 converted into parallel signals and two microprocessors each 3-2 and 3-3. Each of these microprocessors has a read / write memory 3-6, which records the data supplied to it, also via a one-time programming Read memory 3-7, which contains its operating program and also a once Read memory to be programmed 3-8, in which the organization of the block from 2200 Participants is set in the manner of a table. If the queried call seeker is an ASg, an I. GW is permanently assigned to it. The microprocessor knows about the scanning process, which I. GW it is and therefore knows from a table in read memory 3-8 its hundreds number and all higher-digit digits. Only the last both positions must be assigned to him as an ASg position by one of the impulse pick-up devices are fed.

If the queried call seeker is a 1st AS, the II. AS connected downstream from him is queried at the pulse pick-up device assigned to him.

The II. AS is organized so that there are five steps for each Hundreds of the 2200 group ready, so step 1 ... 5 for the 1st, step 6 ... 10 for the 2nd, up to step 105 ... 110 for the 22nd Hundred All 44 II. AS are connected in this way in multiple ways. From the position of the II. AS the Microprocessors 3-2 and 3-3 the respective hundred in which the call number is located, and the read-only memory 3-8 provides him with the except for the last two digits full phone number. The last two digits come from the pulse pick-up device on I. AS. Where exceptions to the assignment between II. AS and I. AS should occur, this can be taken into account in the program. In this case the microprocessors ask 3-2 and 3-3 also the position of the call folder on l.AS and if necessary, II. AS and thus have complete information about the Hundreds group, from which the caller number on the 1st AS comes.

The data and address bus of the two, each consisting of eight lines Microprocessors 3-2 and 3-3 is connected to an equal bus of two via buffers 3-9 further microprocessors 3-4 and 3-5 led. These microprocessors also feature via read / write memory 3-16 and one-time programmable read memory 3-17 and 3-18. The read memories 3-17 are again with a fixed program, the read memories 3-18 provided with office-specific information. The microprocessors 3-4 and 3-5 use adaptation modules 3-12 to scan for new assignments on the one 100 to 150 group selectors assigned to the central unit. The duplication is purely for security reasons; if one of the two microprocessors or its program fails what z. B. can be recognized by the failure of check bits, the other gives an alarm, but can continue to work alone. Control via an interface circuit 3-11 the two systems mutually and exchange their information status with each other the end.

The microprocessors 3-4 and 3-5 are via parallel / serial converters 3-10 each with a number sender NS in the UE of FIG. 1 connected. All number transmitters, that belong to a central unit, i.e. about 10 to 15 per block of 2200 participants, the two frequencies for the frequency shift keying method are parallel to two LF-fed lines. Received from controlling microprocessors 3-4 and 3-5 they only switch on and off as well as toggle commands.

F i g. 4 shows the configuration of a subunit UE and on the left their interaction with the microprocessors of the central unit. The ones here as 4-9 and 4-10 extracted microprocessors correspond to those in FIG. 3 as 3-4 and 3-5 designated building blocks. The scanner SC asks - as already mentioned - faster Sequence the 100 to 150 GW of a block.

If he meets a potential change of z. B. Zero to -60 V for Signs of a new assignment, activate the corresponding evaluation levels 4-7 and 4-8 the two microprocessors 4-9 and 4-10. These switch the multiplex device with the switching elements 4-1 and 4-2 to the relevant 1st GW. The switching element 4-1 connects a winding of the local line transformer OLÜ with the sound receiver 4-3. In the left part it evaluates whether there is still a dial tone. As long as this is present, nothing happens so that the calling subscriber receives this continuous tone undisturbed can. If the dial tone stops as the subscriber starts dialing, a relay will be activated BL excites that with its BL contacts a resistance R to earth to the OLÜ winding lays to create a defined conclusion, and at the same time the relay Terregt, which with its in Fig. 1 contact shown t the calling subscriber from the speech arteries. The choice remains unaffected, as the election acceptance relay AR, as can be seen in FIG. 6, remains accessible to the subscriber. The sound receiver 4-3 remains on hold until he hears a busy tone, an advisory tone or a Receives a ringing tone longer than 300 ms.

The tones in question are evaluated and performed in the middle part for immediate activation of the microprocessors 4-9 and 4-10. On the other hand, hits as Call sign a shortened ringing tone between 200 ms and 300 ms duration, which in the right part is evaluated, as a sign that the called party has a functional unit B, a pulse generator generates 4-5 a pulse of 2 seconds duration, the a relay S is energized for this time. His contact s closes the number sender 4-4 to the OLÜ winding. Controlled by microprocessors 4-9 and 4-10, takes place call number transfer from A to B now takes place. After a time of 2.2 seconds, which defines a timer 4-6, the processors of the central unit are again unlocked.

These processors are only ever briefly identified with an identification process busy, since it only has the rising and falling edges for all the impulses to be emitted need to deliver. So you can easily have up to 20 subunits next to each other operate and also scan their 1st GW. Unlocking means in this sense, that the subroutine running after each recognized new assignment for a specific one I. GW is reset.

In Fig. 5 is matched to the functional unit A described Execution of the functional unit B can be seen. As soon as the local line selector on the relevant step in which a functional unit B is connected to the main distributor is occupied, earth potential appears on the associated c-core. The earth momentum A delay element 5-4 runs through with a delay time of 200 ms and starts then, if it continues beyond this time, a pulse generator 5-5, the emits an impulse lasting 2 seconds. A Rectifier circuit 5-2 tuned to the ringing frequency by a coil 5-1 checks whether a call is being received.

If it arrives within 2 seconds, an optocoupler is used 5-3 and a logic circuit that works in the sense of an AND operation, brought a loop relay S, which s loop the speech wires via its contacts switches and at the same time energizes a relay CLOSED, which with its contact "closed" has a low resistance Earth connects to the c-wire and thus suppresses counting. The relay CLOSE is delayed by an RC element 5-7, so not when the relay changes S in the idle position (release of the loop, transmission of the next call) the state "End of call" is simulated although subscriber B has not yet picked up. While in the direction of subscriber B the call is sent, is sent in the reverse direction to Subscriber A sent the ringing tone. This is now for the duration of the delay time from approx.

200 ms shortened, because afterwards a loop is made between a and b. The abbreviated ringing tone is the request to which the tone receiver in the functional unit responds A responds as described.

The identification of the calling subscriber is possible on both the local as well as at remote level. For long-distance calls, subscriber subscriber A am I. GW on the remote level and rises behind the I. GW in the exchange Am the local office there. Any number of exchanges can be placed in between lie.

F i g. 6 shows a section from FIG. 1 with the central facility ZE and a sub-device UE; to the except for the OLÜ winding and the c-contact Another contact ar of the selection relay AR and contact z of the counting pulses forwarding counting relay Z are connected. Both contacts give their impulses via the multiplexer MXE and one pulse shaper and one pulse converter each to the central unit. From the dialed phone number provided by the ar contact, You can calculate the call charge directly there with the help of a permanently stored zoning table after the duration of the call.

With the use of the impulses supplied by the z-contact, it is above In addition, a count comparison is possible, i.e. a self-check of the system for incorrect counting, which even gives precise information about the route by which, d. H. with participation which voter and call seeker the wrong count arose. The more information if you decrease at the I. GW, the higher the cost of multiplexing MXE. It can be more economical here to use the subunit UE in whole or in part, z. B. only the pulse shaper and converter circuits, possibly also the sound receiver and number transmitter, permanently assigned to each 1st GW.

Claims (9)

Claims: 1. Circuit arrangement for telecommunication switching systems with direct dialing for the compulsory identification of each calling subscriber before the start of the call even across several exchanges, with one dem functional unit assigned to the called subscriber in the terminal exchange (B) with incoming occupancy, a tone-frequency call signal to one of the first group dial level the outgoing exchange sends existing functional unit (A), which by means of of a transmitter which is partly determined from an identification process and in a write memory Cached, partly permanently in a one-time programmable read-only memory contained phone number of the calling subscriber (caller) and his also fixed Local area code (ONKZ) stored in a read-only memory as a caller number via the speech wires to the functional unit (B) assigned to the called subscriber transmits, which receives the caller number and saves it for later display, D a d u r c h e k e n n n z e i c h n e t that the caller-side functional unit (A) from a block of several first group selectors (L GW) assigned Central unit (ZE) with at least one transmitter (NS) controlling the caller number Microprocessor (3-2, 3-3) and at least one read-only memory that can be programmed once (3-7, 3-8) for the fixed part of the caller number and a read / write memory (3-6) for the last two digits of the caller number and that for the identification of these last two digits of the caller number (IMA 1, IMA 2) on the one leading to the motors of the first and second call seekers (AS) Rotary arms of the call folder (1st and 2nd AO), which are present twice per rack, are provided that are connected to the microprocessor in the central unit (ZE) and transmit the position of the relevant switching elements to him (Figs. 1 and 3). 2. Circuit arrangement according to claim 1, characterized in that as a pulse pick-up device (IMA 1 and 2) a microprocessor (2-4) with a read / write memory (2-5) and a one-time programmable read memory (2-6) is used, the a logic circuit (2-2,2-3) for evaluating the motors of the call seekers and call folder controlling impulses and a parallel-to-serial converter (2-7) is connected downstream (Fig. 2). 3. Circuit arrangement according to one of the preceding claims, characterized characterized in that the two pulse pick-up devices provided for a rack frame (IMA 1 and IMA 2) are connected to each other and are derived from the respectively recorded Impulse-derived information about the position of all 24 call seekers of a rack and the two associated call folders and save separately. 4. Circuit arrangement according to one of the preceding claims, characterized characterized in that the central unit has two first microprocessors (3-2, 3-3) contains the information provided by the impulse pickup devices (IMA) record separately and save them in their read / write memories (3-6) and save the in their read memories (3-7, 3-8) data about the organization of the respective block included by first group voters so that they can get from the information of which one Call seekers who received the impulses should each establish the complete call number can (F i g 3). 5. Circuit arrangement according to claim 4, characterized in that the central unit contains two more microprocessors (3-4,3-5), which have matching circuits (3-9) are coupled to the two first microprocessors (3-2, 3-3) and in turn constantly scan the occupancy status of all first group selectors in the block and one of several sub-units (UE) each time a new occupancy is recognized connect to the identified first group selector, which subunit a Receivers (TE) for the call sign of B, further means for exciting a Isolation relay T and finally the number transmitter (NS) contains (F i g. 1 and 3). 6. Circuit arrangement according to one of the preceding claims, characterized characterized in that the call character of B is shortened to a certain length Ring tone is used. 7. Circuit arrangement according to one of the preceding claims, characterized characterized in that the sub-unit (UE) has an evaluation device (4-3) for the Contains dial tone which the isolating relay (T) only operates after dialing has started (Fig. 4). 8. Circuit arrangement according to one of the preceding claims, characterized characterized that the subunit (UE) controlled by the central unit (ZE) a contact (ar) of the dialing relay (AR) is made and the one supplied by it Information about the selected destination after the connection has been established and the Subscriber in B to calculate the fees to be charged to the calling subscriber in A. is used by the central unit (Fig. 6). 9. Circuit arrangement according to one of the preceding claims, characterized characterized that the subunit (UE) controlled by the central unit (ZE) one contact (ar) of the selection relay (AR) and one contact (z) of the counting pulses receiving relays and the information supplied by both contacts can be used for counting comparison in the central processing unit (ZE). The invention relates to a circuit arrangement according to the preamble of claim 1.