DE2104251C - Circuit arrangement for telecommunications, in particular telephone switching systems, which are arranged in various switching networks - Google Patents

Description

The invention relates in general to a circuit arrangement for other intended Telecommunication switching systems via connecting lines are connected to each other, arriving via original lines from calling subscribers and grant access to selectable destinations via target lines. The one previously defined technical facts are well known, z. B. by telephone exchange technology. In this case the Ui hops are those from the local switches to the toll switches and the target lines the reverse lines. Connection lines are all those through which the toll switches communicate with one another. The connecting lines form a network that is star-shaped in several stages or meshed or in which these structures can also occur mixed.

In such networks, incoming connecting lines operated in turn have access to connecting lines. This is necessary when there is a connection between two exchanges should be switched through, no direct lines are running. Furthermore, connections between connecting lines and connecting lines for the establishment of detour connections required, namely if there are no more lines free in a primarily controlled traffic direction are and the desired connection with acceptance of a detour alternatively initially via a connecting line leading in another direction

is switched through - the technical term »overflow« has been coined for this - and if in one further exchange the desired connection via a from here to the selected destination leading connection line is switched through. It is common within certain limits of economy the overflow for establishing a connection in different exchanges several times in succession to enable. The overflow technique thus allows mutual help among the trunk groups in the event of overloading of individual trunk groups using less loaded trunk groups.

The invention relates specifically to a circuit arrangement of the type defined in the opening paragraph, in which which are divided into two types of switching systems for several switching systems provided, which are connected to their own kind via connecting lines according to two types and by each of which two switching systems of different types are assigned to each other, preferably on the same Are provided on site and have mutual access to one another via transition lines. It is already known to provide different exchanges at the same place, e.g. B. Remote, local and private branch exchanges. It is also known to switch exchanges of the same type to one another by means of associated networks of trunk groups connect to. Such networks can even partially overlap.

However, the invention is based on a different problem than that of such coincidences. The development the telephone exchange technology is more and more centrally controlled in recent times Telephone exchanges over. The latest result of this is a computer controlled telephone system to be named with the stored program (see Yearbook of Electrical Telecommunications 1971, V: rlag for Science and Life, Georg Heidecker, Bad Sinsheim). All logical functions in a corresponding telephone exchange are carried out by a central computer. Its operations run according to programs, the program memory allocated in eh. ^ M are included. All other data, namely those for establishing the connection, connection monitoring and necessary for the connection release are - if necessary - in a working memory cached.

Telephone exchanges held after this are connected to one another via central data channels. These are used, among other things, to transmit voting information for the production of elected Links. The exchange of information via data channel directly between the central control devices two mulping systems connected to one another by telephone connection lines As is well known, it considerably simplifies and accelerates the establishment of a connection. Namely have to dial number are transferred from one central control to the next, they become more conventional when used Technology via forwarding registers, outgoing line transmission, line, incoming Line transfer, receive register passed from central control to central control. Here there is a multiple implementation. This requires time (i.e. slower connection establishment) and circuit engineering effort (more expensive registers and line transfers) and brings the Risk of falsification of characters (translation errors). The aforementioned computerized telephone exchanges with a stored program, on the other hand, are already based on the principle that dialing numbers can be transmitted to direct Ways to accomplish that by bypassing the connecting line and its line transmissions and, moreover, make it possible without such

ίο Line transfers get along and carry on this way to a significant saving of effort.

When introducing computer-controlled telephone exchanges with stored program and with election information transfer via central data channels give way to economic considerations and the undiminished strong demand new subscriber connections Vc -. nlassung that far widespread telephone local and Ferr .: telephone dial-up network conventional technology initially to continue to operate and telephone exchanges to the computer-controlled Install technology where extensive expansions are required. From this it follows that little by little in addition to the telephony switching systems conventional technology those of the computer-controlled technology arise. The telephone exchanges of both types are over Bundles of connecting lines also of two types in connection with one another. So Bs arises in addition to the system of conventional telephone exchanges with their own line network, a complete one Another system of telephone exchanges e'er computer-controlled technology. for this development is, among other things, that of the computer-controlled telephone exchange system used central data transfer between the computers of the various central control units crucial.

On the other hand, there is a requirement that every participant can reach every other participant, that is to say also mutually the participants connected to telephone exchanges of different systems. The transition lines already mentioned above are used for this purpose. In addition, there is a need for mutual assistance with connecting lines for both systems in the sense of the overflow technique already explained above. Are now provided in the manner defined above in two different networks telephone exchange systems, which are accordingly subdivided into two types and the above connecting lines are connected to their equals according to two types and of which two switching systems of different types are also assigned to one another , preferably on The same place are provided and have alternating access to each other via transition lines, so these transition lines can create the possibility in the sense of the transfer technology that all bundles of lines of both systems help each other out depending on the degree of load. Another problem arises here. Every transition from one system to the other requires the electoral information to be implemented. Because of the different principles of dialing information transmission in the two systems, complete intermediate storage is required each time at the transition point. The advantages of the fast transmission of voting information via the central data channel in the

Computerized technology telephone system in this case would be completely lost again. The connection would be different in these cases delay considerably in a way that is disruptive for the participants, for which the technical term »call delay« has been coined. Furthermore brings the possibility of a multiple transition from one System to others a significant load of the bundle of transition lines with itself and makes it is necessary to measure these relatively extensively i'iid correspondingly an extent for this inputs and to provide outputs from switching circuitry; in connection with it svä-e also also the scope of the switching systems themselves to expand corresponding mass.

For the Hrfindung there is the task, assuming two parallel networks, z. B. Telephone networks, two different systems a mutual help in the sense of both pipeline networks to enable the overflow technique, with disadvantages of the effort and the loss of time the establishment of the connection as a result of the intermediate storage that is causally associated with the transition and the disadvantages of the expense for the transition line bundle and the costs required for this Koppelschaltmiltcl should be kept within the narrowest possible limits.

This object is achieved according to the invention solved that, on the one hand, only the originating lines of an exchange tier have an incoming b / w. the other Type - via transition lines in the switching system of the alitier type - or of the one type - connectable both to their outgoing assignable connection lines and to their destination lines are, on the other hand, the incoming assignable connection lines of the switching system the one ArI - Ivw. of the other kind - via transitional lines in the switching system of the other kind - Ivw. of one kind - only with their target lines are bindable and that for this purpose the two connection possibilities are on the one hand from the original lines and on the other hand from the incoming busy connecting lines through an at tier Allocation of an interim line to the Vermitthmg.sanliige the / wide kind - or the first kind - iibettiagencs distinguishing feature in the latter are different.

The invention makes it possible for each connection to be established enables a two-way transition from one system to the other and vice versa. A the first transition is only possible at the beginning of a selected hot delivery connection. He can do it The mutual assistance of both networks is possible. The second crossing is only on the linden side of the connection, d. H. in the exchange that provides direct access to the selected destination (destination line) granted, possible.

Mutual temporary help therefore affects the two pipeline networks as a whole, not the bundles of its individual members Drainage section. This ensures that despite the mutual help of both Lei-. control each connection across its major part, i. H. from the connection point of the original line until the declaration is finalized, in the same system remains. This is particularly important for long-distance calls. At the place of origin (Switch on)! ι d ·.! occupied original line) is dwell routing and billing in As a rule, intermediate storage is necessary anyway. A transition at this point makes in the Usually no additional caching is required. At the connection point of the target line is another rope a substantial part of the dialing information has already been used up to establish the connection. A transition at this point therefore allows the least possible intermediate storage Scope. The transition once at the beginning and

ίο at the end of a telephone connection causes despite Exploitation of the advantages of the mutual assistance of the various line networks, that a telephone connection is completely switched through within only one of the two line networks. d. H.

with regard to the part that runs over trunk lines. The connection of a Telephony only within one of the two systems creates the possibility that in advantageous Way the election information over several

ao line sections consistently throughout can be. This represents in an intercom switching system the computer-controlled technology makes full use of the voting information transfer the advantages specified via central data channels.

The invention is of course not limited to <Ji Existence of only two parallel telephone exchange networks is limited, but can be equated with ·. · Advantages also on several parallel networks r.nwui-

3 "the. In each case c-in transition from an as f to another network at the beginning (point of view of the relevant original line) one has to be switched through: · -u connection and a second transition from this other network to any of the other networks, da - However, to achieve the desired goal: it must be. at the destination (display location of the concerned. '. » destination line) of the connection to be sounded through w ■ borrowed.

In the drawings, Figs. 1 and 2, an Au ^ 'is ^:

rungsbcispicl of the invention shown on weleu, she jetloch! is limited in one way.

In Fig. A larger number of telephone exchanges AX to L1 is shown which iil a network of connection lines which are connected in a known manner in Biim.el / usim. .. ■ "· are connected to the Femsprcchvemiittlungsstelk A 1/1 are carried out in a conventional · nik Vermiitlungsteel and have - like the) ^be: half F i g 2 shows - as Verniiltlunusschali.

means voters / »11, P12, / '13 and / '14 on which> are supposed to symbolize groups of voters. The telephone exchanges Al to L 2 are dagc conditions with the help of computers centrally controlled systems such. B. those, as described in detail in the aforementioned yearbook of electrical telecommunications. As the lower half of FIG. 2 also shows, switching matrices P1 serve as switching switching means. These are shown in FIG. 2 only for reasons of a simpler representation

single-stage and with inputs and outputs, but can just as well be used as coupling fields Reverse grouping can be designed.

The telephone exchanges in Fig. 1 are connected via bundles of connection lines, e.g. B. V 1,

I ⁷ ! ', Vl. VT and others connected to each other. These connection cables can be single-directional or double-directional with regard to the direction in which the connection is established. In any case, a Vcr-

bindimgshcrstelhir.g between each vein two Fernspreehvcrmitllimgsslcllen in both directions possible. These Fenrsprcchvcrmiltlungsstellen there may be those for the provision of so-called IV ■ · ngespräehcn, so to FcrnsprechvcrmiUlungsstcllcn.

The telephone exchanges A I to 1.1 are also via originating lines, e.g. / Ί. Oil available from calling participants arriving. These may be feeder lines from an associated so-called remote control center. The telephone exchanges A 1 to 1.1 also have calls, τ. B. Zl. Yl. Access to selectable destinations, e.g. B. also associated telephone exchanges. which are selected to reach subscribers from the remote network / (Fig. I).

As FIG. 1 shows, two telephone exchanges are assigned to one another. As a rule, these are two telephone exchanges, A 1 and A 2, in one and the same place. As described, they are implemented using different technology This results from the expansion problem already discussed in detail. Intercommunication points assigned to one another, e.g. A I and A 2. have reciprocal access to one another via transfer lines, e.g. X and ".

In Fig. 2 shows how connections can be made. Within the Fernspreelnermiltlungsstclle A 1 shown above the dash-dotted line and within the telephone exchange A 2 shown below the dash-dotted line, originating lines U \ or t / 2 and incoming connecting lines KIr and VIr have access to outgoing assignable connecting lines V 1 / or VIt and to Ziellinungcn Z1 or Z2. At this point it should be pointed out that the incoming, assignable connection lines VIr and the outgoing assignable connection lines V It are equipped with a central communication channel wr or wt , which, among other things, enables rapid data exchange via data terminals Wr and Wt between the computers of the central control units (p ) different Fernsprei'hVerschmittlungsstellen serves.

Furthermore, in Fig. 2 transition lines Λ'1 / 2. yi / 2, X 2/1 and Y2I \ are shown. As their names suggest, these are transition points between two categories (X ... and Υ ...). The original lines U 1 of the telephone exchange A 1, which is implemented in conventional technology, are in this with the transition lines X 1/2 'of a first category and these in the telephone exchange A 2, which is implemented in the computer-controlled technology, both with their outgoing bclegbaren connecting lines V 2 t, as well as with their target lines 7.7. connectable. On the other hand, the Ahr connected to the telephone exchange A 1, incoming assignable Verbindungslcitungen KIR / 2 of a second category, and these connected in this exchange with transition lines Kl in the Femsprechvermittlungsstelle Al only with the aim lines Z2. To illustrate these conditions, which are technically implemented in FIG. 2 , a dialing multiplier ρ common to the selectors P12, PIl, P13 and P14 is shown in the telephone exchange A I. A first output group of this voter multiple grants access to the Ziellei ungen Z 1 of this telephone exchange. This output group can be reached by all four voters. The third output group of these voters gives access only to the transition lines X 1/2 of the first category. These transition lines can only be reached from the originating lines connected to the telephone exchange A I (/ 1 or the dialing group symbolized by the dialer P13. F. a fourth

ίο influenza of these voters grants access to the transition lines Y 1/2 of the second category. Apart from the peculiarity of y \ ·, these transition lines can only be reached by the incoming assignable connecting lines Kl / · connected to the exchange A 1 via the voter group symbolized by the selector / '14. - In the switching matrix P2 of the telephone exchange A 1 , the intended connection options are indicated by small circles drawn around the relevant crossing points between F.input lines (shown horizontally) and output lines (shown vertically) read switching matrix P 2. The transition lines X Ml grant access in the telephony switching center A 1 both to the connected destination lines Z2 and to the outgoing connection lines K2i.

Herein lying invention legality also relates to the connectivity through by the FcrnsprcenvcnmUiungsstcllc A 2 through the transition lines A "2/1 of the first category and y2 / l of the second category to the Femsprcehvermittlungsstelle A 1 through switchable connections. The in Fernsprechvcrmittlungsstellc A 1 connected origin lines Ul have access to their destination lines Z1 as well as to their outgoing connection lines V 1 1 via the transition lines X 2/1 and the voter group symbolized by the selector P11 in the telephone exchange A 1. The connection lines VIr arriving in the telephone exchange A 2 on the other hand have access via the transition lines of the second category y2 / l and the voter group symbolized by the voter P12 in the telephone exchange A 1 only to the call lines Z1 connected to them.

Due to the regularity according to the invention, a two-time connection is established for each connection

Enables transition from one system to the other and vice versa. One system consists of the telephone exchanges A 1 to L 1 and the connecting lines connecting them, and the other system consists of the telephone exchanges A 2 to L 2 and the connecting lines connecting them. A first transition is only possible at the beginning of a selected connection to be established by only connecting the original lines of the telephone exchange of one type via transition lines.

gen the issuing trunk lines of the telephone exchange the other way - and vice versa - and by the incoming occupied connecting lines of the telephone exchange of the one kind via transition lines

services can reach the Zielleitur.gen of the telephone exchange of the other type - and vice versa -. This first transition creates the opportunity for both networks to help each other out.

Achieved /. B. a calling subscriber via the original line U 1 to the telephony exchange A 1, and if all lines of the telephone switching network suitable for reaching the telephone exchange G 1 are busy, the calling subscriber in the telephone exchange A 1 is connected to the telephone exchange A 2 connected through; From here, a connection to the desired destination is switched through in the telephone switching network of the computer-controlled technology. A transition from the telephone exchange network of computer-controlled technology to the telephone exchange network of conventional technology is only possible at the destination. This prevents the connection from being able to switch from one telephone switching network to the other and back several times en route. At the destination, the dialed connection is passed through if necessary from the telephone exchange station G1 to the telephone exchange station G1 via one of the relevant transition lines and from here via a target line to the desired subscriber. Despite the mutual help of the two line networks, each connection remains in the same telephone switching network for most of its time, ie from the connection point of the original line to the connection point of the destination line. This is a particularly significant advantage in the case of long-distance telephone connections. At the Urspiungbuii (connection port of the busy original line), intermediate storage is usually necessary anyway because of the routing and billing. A transition at this point does not usually require any additional intermediate storage. At the connection point of the target line, on the other hand, a significant part of the dialing information has already been used to establish the connection. A transition at this point therefore allows intermediate storage to the smallest possible extent. The transition once at the beginning and at the end of a telephone connection has the effect, despite the use of the advantages of the mutual assistance of the various telephone switching networks, that a telephone connection is completely switched through within only one of the two line networks, i.e. with regard to that part that runs over telephone lines. The switching through of a telephone connection only within one of the two systems, e.g. B. A 1 to Ll or A 2 to L 2, creates the possibility that the dialing information can be consistently transmitted consistently over several line sections in an advantageous manner. In the telephone exchange system of computer-controlled technology (/ 4 2 to Ll) this ensures the full use of the advantages given by the transmission of dial information via central data channels (wr, wt).

In Fig. 2 at 11 and in the yt Fernsprcchvcrmittlungsstelle Al is shown a further Ausfünrungsvarianle the invention yl wherein in the FernsprechvermiUlungsstelle /. Thereafter, the origin pipes Ul FernsprcchvermiUlungsstelle of Al over the symbolized by the selector / ^J 13 Wählergruppe the Übergangsleitungcn Y 111 the second category and achieve this in the telephone exchange A 1 connected to them can Ziellcitungen Zl. For connections between the originating lines U 1 and the destination lines Z2, not only the transfer lines X 1/2 of the first category but also the transfer lines Y 1/2 of the second category can also be used. The same applies to connections between the original lines Ul and the destination lines Z 1, for which, in addition to the transition lines Ul and the destination lines 21, for which the transition lines A "2/1 of the first category and the transition lines Y11 of the second category can also be used. The regularity according to the invention is not impaired by this.These design variants only allow an increase in the utilization of the transition lines.

Reference should also be made to another embodiment variant, not shown. This provides that in both directions between two associated switching systems, for. B. A 1 and A 2, a common bundle of transition lines is provided for each of these two directions. To now, in the manner according to the invention, the originating lines U 1 of the switching system A 1 in the switching system A 2 both with their outgoing assignable connection lines Vt 1 and their destination lines Z2, but on the other hand with the incoming connecting line V 1 of the switching system A 1 in the switching system To be able to connect A 1 only to their destination lines Z2, according to this variant, when a transition line is occupied by an originating line, an assignment criterion of a first type is given, whereas when a transition line is occupied by an incoming connecting line, an assignment criterion of a second type is given. This is evaluated in a corresponding manner in the switching system A 2, in that the relevant transition line can be connected in one case either to an outgoing assignable connection line VIt or to a target line Z 2, in the other case only to a target line Z 2. The same applies to connections from switching system A 2 to switching system A 1.

1 sheet of drawings

Claims (5)

Patent claims: 1.Circuit arrangement for several telecommunication systems, in particular telephone switching systems, which are connected to one another via connecting lines, are reached by incoming subscribers via original lines and grant access to selectable destinations via target lines, which are further subdivided into two types of switching systems and of two types via connecting lines are connected to their own kind and of which two switching systems of different types are also assigned to one another, are preferably provided at the same location and have reciprocal access to one another via crossover lines, characterized in that on the one hand only the original lines (U 1 or U1) one Switching system of one type (A1) - or the other type (A 2) - via transfer lines (X 1/2 or X 2/1) in the switching system of the other type (A 2) - or one type ( AX) - both with their outgoing, assignable connecting lines (V 2 / or VX t) as well as with their target lines (Z 2 or Zl), but on the other hand the incoming assignable Vt.bindungslcitungen (VIr or. VIr) the switching system of the one type (A 1) - or the other type (A 2) - via transition lines (Y 1/2 or Y 2IX) i the switching system of the other ax (A 2) - or the one type (AX) - can only be connected to their destination lines (Z2 or Zl) and that for this purpose the two connection options on the one hand from the source lines (VX or Vl) and on the other hand from the incoming connecting lines (VXr or VIr) by means of a during the occupancy a transition line (t / l or Vl) to the switching system of the second type (A 2) - or the first type (AX) - transferred distinguishing feature in the latter distinguishable sir.J. 2. A circuit arrangement according to claim 1, characterized in that transitions of two categories (X ... , Y ...) are provided in both directions between two switching systems (e.g. AX and A 2) are and that on the one hand only the original lines (UX or Ul) of the switching system of one type (AX) - or the other type (A 1) - in this with transition lines of the first category (X 1/2 or XlIX) and these in the switching system of the other type (A 1) - or the one type (AX) - can be connected both to their outgoing assignable connection lines {VZ ( or VXt) and to their destination lines (Z 2 or Zl), but that on the other hand, the incoming assignable connection lines (VXr or VIr) of the switching system of one type (AI) - or the other type (A 2) - in this with transition lines of the second category (YXIl or y2 / l) and these in the switching system of the other type (A 2) - or the one type (AX) - only with their target itunc, en (Z2 or Zl) can be connected. 3. Circuit arrangement according to claim 2, characterized in that the original lines (UX or Ul) of a switching system of one type (A 1) - or the other type (A 2) in this with transition lines of the second category (Y 1/2 or YlH) and these in the switching system of the other type (al) - or deeine type (al) - can be connected to their feed lines (Zl or Zl). 4 circuit arrangement according to claim 1, characterized in that a common bundle of transition lines is provided for each direction between two mutually assigned switching systems (z. B. AX and A 2) and that on the one hand only the originating lines of the switching system of the one type - or the other type - on the basis of an occupancy criterion of a first type when a transition line is occupied in the switching system of the other type - or one type - both with their outgoing assignable connection lines and with their destinations., ngen, on the other hand But the incoming, assignable 'connecting lines of the switching system of one type - or the other type - can only be connected to their destination lines due to an occupancy criterion of a second type when a transition line is assigned in the switching system of the other type - or the one type. 5. Circuit arrangement according to claim 4, characterized in that for both directions a common bundle of double-directional transition lines is provided.