DE2816898C3 - Circuit arrangement for telephone, in particular company telephone systems, for blocking connection through-connections that can be established automatically - Google Patents

Description

The invention relates to a circuit arrangement for centrally controlled telecommunications, in particular company telephone systems, with automatically controllable connection through-connections, with through subscriber categories Line bundles divided into different authorization criteria and with an identification device, with an authorization evaluator and with a code memory.

In telephone systems defined in this way, the subscriber stations causing such measures are checked to determine whether they are entitled to set up such call connections before the connection is made. A distinction is made in the telecommunications systems, for example, between authorized, semi-authorized and non-authorized categories. Subscribers who are authorized to do so can set up outgoing calls as well as being called directly by subscribers in the incoming traffic direction. While participants with semi-official authorization can only be connected to the exchange participants in the incoming traffic direction (simple blocking), participants who are not authorized to do so may not be connected to the exchange participants either inbound or outbound (double-sided blocking). There are similar differentiation criteria for so-called remote authorizations, which relate to call connections in which the connections extend beyond a certain local area (remote dialing).
Due to the special characteristics of company remote intercom systems, additional authorization criteria can arise for the individual subscribers, for example through the possibility of intruding on existing call connections, which in the same way before the connection through-connections

ι ⁵ must be checked for their presence.

For all of these different authorization criteria it is known what are known as authorization disks provide on which - for example in the form of a printed circuit - lines which are arranged similar to those of a coordinate field. Thereby the lines of the one Entrance level, for example, the hundred mark assigned to the individual participants, while the Lines on the other entrance level, which have a

2ϊ Contact combination of tens and ones contact markings of the participants are controlled, represent either the positive or the negative statement of authorization. The galvanic connection of the crossing lines are either over

J "jumper diodes or made by means of cable bridges.

For the individual eligibility criteria, e.g. B. semi-official or participants who are not officially authorized, are therefore separate routings on different authorization

i "> supply plates provided.

Furthermore, it is known, due to the different traffic flows in the outgoing and incoming Connection traffic these authorization checks in various central control devices

4 ". For example, the trunk authorization and thus also the statement about the non-office authorization for incoming official traffic in a dial code converter based on the selected company telephone subscriber number

i ^r > averages, while a subscriber line identification takes place with outgoing exchange traffic according to the selected exchange code and the authorization check is carried out by the so-called authorization evaluator.

■> o These different control processes are due to the checking of several different authorizations for the connection traffic in incoming and outgoing direction associated with considerable expenditure on equipment and require about it

v-, in addition to extensive shunting work.

In addition to the direction-dependent restrictions on worship, especially in larger cable networks with a large number of company telephone systems to be connected to one another, further traffic incidents

w) restrictions to be considered. In these pipeline networks namely, the various company telephone systems cannot only use a single connection path - the shortest between two systems - can be connected, but it can also be connected

(> ■ ". Establish the above-mentioned detour connections. These Detour connections between the original system and the target system lead via one or more other company telephone systems. Since this connection

gen both with regard to the additional line assignments and with regard to the loads on the company telephone systems involved are very expensive, only a certain group of participants will be within a company telephone system to be entitled to use such communication paths. In addition, is sensibly also the number of authorized participants with the length of the detour (second-third way etc.) in order not to reduce the entire network: through a few calls to load very heavily.

The object on which the invention is based is to check traffic restrictions depending on more than two conditions to enable line connections to be switched through and at the same time the expenditure on equipment and the control processes for the individual locking checking processes to be kept as low as possible.

This is achieved according to the invention in that the authorization evaluator has at least two groups of Interlocking switching means which prevent connection through-connections, each having one input and one Has output that to the first group of locking switching means associated inputs and to the directional control potentials and inputs assigned to the second group of blocking switching means that to the outputs assigned to the first group of the locking switch means, as well as index-oriented the outputs assigned to the second group of blocking switching means, direction-oriented control potentials can be switched on.

With the provision of two types of interlocking switching means linked in this way, it is achieved that the Directional bundle of lines taking into account the selected key figure in a simple manner can be blocked against each other. Specifically, this means that a detour connection between the Original system and the target system, for example, via an incoming direction-oriented system Line bundle 1 if the code number 1 is selected and an outgoing direction-oriented line bundle 2 can be locked with. In addition, this type of variable blocking option is called Line bundles, depending on the selected key figure, also as regulated routing.

It is to be regarded as essential for the invention that the blocking possibilities are not only one-sided Blockings - an incoming trunk group is only against an outgoing trunk group with one certain code blocked - restrict, but that by appropriate sound further blocking switching means a double-sided blocking can also be implemented with the same circuit arrangement. In relation to the above example, this means that the incoming line bundle 2 with Dialing the code 1 is not connected to the outgoing line bundle 1.

The invention is explained in more detail using an exemplary embodiment illustrated in the figures, in which only those necessary to understand the invention Switching devices are shown.

In the bundle identifier BID , the direction-oriented identification contacts Xbk, 2bk for the incoming line bundle and Xbg, 2bg for the outgoing line bundle are provided in line bundles combined with specific authorization criteria. In addition, the authorization evaluator BA Wund of the key figure storage device SKZ is shown, which is connected to the bundle identifier BID via a large number of control lines. The authorization evaluator BAW contains the blocking switching means XA, 2Λ, 3Λ and \ C, 2C, which via the corresponding switching points a 11, a 12; a 21, a 22; a 31, a32; ell, cl2; c21, c22 with the routing points XK, 2K assigned to the line bundles for the incoming line bundle and IC, 2G for the outgoing line group elements of a range

ici yaw wiring are connected. Furthermore, the blocking output 5P is provided for the connection traffic in the authorization evaluator BA W. If necessary, the blocking criterion is transmitted to the central control unit, not shown, which then prevents the connection from being switched through in a manner also not shown.

The function and mode of operation of this circuit arrangement is explained below using the routed Blocking switching means 2Λ, 3/4 and lC and 2C both for the simply explained as for the double-blocked link traffic.

First of all, it is assumed that in the simply blocked connection traffic, a transmission belonging to the trunk group 1 is assigned, incoming is busy and

2 ". Based on the available destination information - the code number 1 is selected - is connected to a subscriber which can be reached via the outgoing busy trunk group 2. The trunk groups 1 and 2 should, however, be blocked in this traffic direction in connection with the selected code number 1.

In the selected example, the bundle identifier BID transfers the incoming line bundle 1 by actuation of the identification contact Xbk and the outgoing line bundle 2 by actuation

i> of the identification contact 2bg marked, while the corresponding identification number contact Xkz is closed by the identification number memory SKZ. A circuit is then closed via the actuated identification contact IM and the simultaneously closed identification number contact 1A, in which the blocking switching means 2A is switched on via the connections a21 and a22. Via the switching contact 2a 1 of the blocking switch means 2Λ that is actuated by it, switching potential is also applied to the connection c 12 of the switching means IC, whereupon this blocking switch means IC also eil via the already activated identification contact 2bg of the bundle identifier BID and the unmarked jumper line between the connection point 2C and the connection is excited. The thereby actuated switching contact lc des

; o Sperrsctialtmittel IC applies the blocking potential to the starting point SP and thus signals to the central control unit, not shown, that this connection between the trunk groups 1 and 2 will not be switched through at the selected code number 1

"> ^r i may.

In the case of double-blocked connection traffic - based on the example described above - the Line bundle 2 in the incoming traffic direction against the line bundle 1 in the outgoing traffic

ho direction at the selected code number 1 to be blocked. In the authorization evaluator BA W are the switching points 2K with a 31, a 32 with XKZ and IC with c21 and c2? to be connected to a3 via patch cords. In a similar way, as already described, the

b ¹ ) actuated identification contact 2bk and when the code number contact is actuated lJtzdas the blocking switching means 3Λ energized, which in connection with the also actuated identification contact Xbs of the bundle identifier BID

and the switch contact 3a 1 of the blocking switch means 3-4, which is also actuated, switches on the blocking switch means IC. Via the actuated switching contact 2C, as already described for the simple blocking, the blocking potential is switched on to the point SP of the authorization evaluator BA W and the connection between incoming line bundle 2 and outgoing occupied line bundle 1 is blocked with code number 1.

1 sheet of drawings

Claims (3)

Patent claims: 1. Circuit arrangement for centrally controlled telecommunications, in particular company telephone systems, with automatically controllable connection through-connections, with trunk groups subdivided into different authorization criteria by subscriber categories and with an identification device and an authorization evaluator and with a code memory, characterized in that the authorization evaluator (BA W) has at least two groups of Interlock switching means (IA, 2A, 3/4 ... and 1C, 2C ...) each having an input fall, a21, a31 ... and eil, c21 ...) and an output (a 12, a22 , a32 ... and cl2, c22 ...) that the inputs (ait, a21, a31 ...) and to the inputs fell, c21 ...) assigned to the second group of blocking switching means (IC, 2C ...) direction-oriented control potentials and that of the first group of blocking switching means (1 / 4,2 / 4,3.4 ...) added rdneten outputs (a 12, a 22, a 32 ...) index-oriented as well as to the outputs (c \ 2, c22 ...) assigned to the second group of blocking switching means (IC, 2C ...) direction-oriented control potentials and to the inputs fell, c21 ...) key figure-oriented tax potentials can be switched on. 2. Circuit arrangement according to claim 1, characterized in that with lden: ifizierkontakten (IiAr, 2bk ... ibg, 2bg ...) of the Identitizicereinrichtung (BID) the direction-oriented and with code number contacts (LA: z, 2Arz ...) of the Key figure memory (SKZ) the key figure-oriented control potentials can be switched on. 3. Circuit arrangement according to claim 1, characterized in that a contact (lcoder 2c ...) of the second type of blocking switching means (IC or 2C ...) preventing the connection through-switching controls.