DE3123616A1 - Method for preventing blockages of connection-specific devices - Google Patents

Abstract

In an indirectly controlled telecommunication switching system, particularly a telephone switching system, comprising a memory with storage areas permanently allocated to the subscriber lines and the connection-specific devices, into which, in addition to other information items, the addresses of the further subscriber lines and devices involved in the connection concerned are entered during the setting-up of a connection, the further subscriber lines and devices involved in the connection concerned are determined during the releasing of the connection and it is checked whether the storage areas concerned in each case contain the address or addresses of the further subscriber lines and devices involved in the connection. In a case of non-agreement, a diagnostic programme is started which determines the missing address by searching the memory. It is only then that the device concerned is released in the memory. This avoids a blockage of connection-specific devices when the address of a device involved in a connection which is falsified by a disturbance is entered in the memory.

Description

experienced in avoiding blockages of

binding-individual devices The invention relates to a method to avoid blockages of connection-specific facilities in one indirectly controlled telecommunications, in particular telephone switching system with a Memory with the connection lines and the connection-specific Einrichtlgen permanently assigned memory areas into which in the course of a connection in addition to further information such as operating statuses, the addresses of the further connection lines and devices involved in the connection in question entered and this information again when the connection is released to be deleted.

In such an intercom exchange system, the control device Memory with memory areas, which the connection-individual facilities are permanently assigned. Is it the connection-specific facility an internal connection set, the addresses of the two with this connected connecting lines entered in the memory area. Acts the respective connection-specific device is a wiring harness, this is how the address of the subscriber line connected to this is entered . The use of such memory areas is for example in the yearbook des electrical telecommunications 1971, publisher for science und Leben, Bad Wwndsheim, 1970 on page 80.

In order to avoid searches, it has proven advantageous to not only store the connection data in the memory area, which of the connection-specific Facility is assigned, but these in the memory areas of all at the relevant connection to put down the lines and facilities involved. At a Connections between two participants via an internal connection set are made accordingly the address in the memory areas of the respective subscriber connections of the connection set and the address of the other subscriber connection. Corresponding notes for the division and use of a central status memory for switching systems is described in DE-0S 28 05 584, for example.

It can now happen that. a bit position due to a fault an address of a connection-specific device or a connection line is set and this corrupted address is entered in the memory area. This does not affect the establishment of the connection, but it does so when it is triggered the connection becomes the connection line or device lying in the course of the connection is no longer marked as free in the memory because its address is in the memory area Another connection line or device involved in the connection does not was registered. This has the consequence that the relevant connection line or device remains marked as busy in the memory and for further connections can no longer be used.

The object of the present invention is and is a method with the help of its blocking of connection-specific Establishments were avoided.

According to the invention the object is achieved in that upon detection the release of a connection, the other involved in this connection @ connecting line and / or device is determined, which is then checked whether in the relevant Memory areas each contain the address or addresses of the others on the connection involved connecting lines or device is or are included and that at Mismatch a diagnostic program is started, which is done by scanning of the memory the missing address is determined and the activation of the relevant Connection line or device initiated in the memory.

By checking the control addresses and the memory contents the memory areas of the connection lines and devices involved in a connection it is easy to determine whether the correct addresses are in the memory areas are registered. The free marking is only carried out in the memory if they match.

As the DE-OS 28? 9S97 is already; a procedure for activation of peripheral devices and / or of connections in one with stored Programs centrally controlled switching device known in which at Occurrence of faulty control procedures leading to a program termination Command sequence is running, whereupon the relevant connection is traversed will. This procedure is used to avoid blocking of the controller and also from peripheral facilities, whereby a blockage was avoided should, which are caused by a program abort in the control device can.

The invention is explained in more detail using an exemplary embodiment, which is shown in the drawing. It shows: FIG. 1 the block diagram a telephone private branch exchange and FIG. 2 shows the representation of a memory with the memory areas.

The explanation of the invention is based on the representation of a block diagram a private branch exchange with a single-stage switching network explained, wherein It should be noted that the application of the invention is not to a private branch exchange and not to a telephone exchange with a single stage switch is limited. On a single-stage switching network KF (FIG. 1) there are rows Subscriber connection connections TS For the connection of subscriber stations T 1 to T n connected. Y. with the columns are the connection-specific facilities like internal connection sets IV 1, IV 2 and wiring harness AU 1, AU.2 connected. the The connection setup and disconnection is controlled via the control device ST, which is connected accordingly with the individual facilities. Hereinafter will briefly refer to the processes within the private branch exchange when switching through of connections received, but only those operations are explained in more detail which are absolutely necessary for understanding the invention.

First of all, it is assumed that the line transmission is on the connecting line AL AU 1 is occupied and a connection to subscriber station T 2 is desired. the Occupancy of the line transmission AU 1 is communicated to the control device ST and in a memory, not shown, the relevant line transmission in the assigned Memory area marked as occupied. On the connection ! device AL incoming dialing codes are evaluated by the control device ST and determines the address of the desired subscriber line. With these two Information is a corresponding connection (1) through the switching network KF Initiating the control device ST switched. The determined address of the desired Subscriber line is also in the memory area of the line transmission AU 1 is entered in line 21 at storage location WA 2 (see Figure 2). In addition, the address of the line transmission AU 1 is entered in the storage space WA 1 of line 2, which is assigned to the subscriber line TS 2 is.

E, n further connection request can, for example, in a connection exist between the subscriber stations T 1 and T n. It is assumed that that the handset is picked up at the subscriber station T 1. The one caused by it An increase in the loop current is recognized in the subscriber: an Anschlussschaltlmg TS 1 and communicated to the control device ST, which causes the switching network KF, a Connection between a free internal connection set, for example IV 1 and the subscriber line circuit TS 1 to produce (2). At the same time, the Storage location WÄ 1 of storage line 1 the address of the internal connection set IV 1 and the address of the subscriber line circuit in the memory location WA 2 of the memory line 31 TS 1 entered (see Figure 2y.

After the participant through the internal connection set IV 1 fed-in dial tone has been requested to dial, the subscriber station T 1 transmitted dialing code received by the internal connection set IV 1 and This is passed on to the control device ST, where a revaluation takes place in the address of the desired subscriber line, in this case the address of the subscriber line circuit TSn instead. Because of the determined address is provided by the control device ST initiates the connection of the two subscribers in the switching network KF. aside from that further information is entered in the memory in the memory location WA 2 of line 1, the address of the subscriber line circuit TSn in the memory location WA 3 of line 31, the address of the subscriber line circuit TSn and in the Subscriber line circuit TSn associated line 20 the entry of the address of the internal connection set IV 1 in the memory location WA 1 and the address of the subscriber line circuit TS 1 into storage location WA 2.

As soon as one of the participants hangs up the handset, this becomes the Control device TS communicated which thereupon the release of the connection ». in tiem switching network KF initiated. In addition, the memory contents of the Connection involved connecting lines and facilities deleted. The A-aftinden of the individual memory areas or lines of the memory happens as follows: It is assumed that the handset is hung up at the subscriber station T 1 became. The hanging up is recognized in the subscriber line circuit TS 1 and the Communicated control device ST. With the help of the address of the subscriber line circuit TS 1, the relevant memory area, i.e. line 1 (see Figure 2) is found and with the help of the addresses stored there, the others on the connection participating institutions determined with the address contained in memory location WA 1 of the internal connection set IV 1, the memory area or the line 31, which the internal connection set TV 1 is permanently assigned, found and the memory content turned off. The same happens with the one contained in the memory location WA 2 of line 1 Address of the subscriber line circuit TSu. This is used to control the memory area or line 20, whereupon the information contained there is also deleted will.

If nuci occurs, for example, that the Addresses to be entered in the memory area or line 1 of the memory location WA 1 of the internal connection set IV 1 is falsified by a fault, then in the course of the disconnection of the internal connection set IV 1 assigned memory area (Line 31) cannot be found. As a result, the internal connection kit IV 1 is enabled itself, but continues as such in the control device ST remains marked as occupied.

In this context it should be pointed out that further Storage locations WA of the memory to identify the operating states (free, occupied) are provided.

The corrupted address can, for example, result in a memory area which is not used.

In order to prevent such a blockage, if the connection is disconnected in the control device ST a cross-check of the memory areas of the institutions involved in the connection. This is how it is checked whether, with regard to the connection example described, the information given in line 1 address of the internal connection set IV 1 controlled memory area of the internal connection set IV 1 (line 31) the address of the subscriber connection TS 1 contains. With the addresses of the other institutions involved in the connection The same procedure is followed. If the check shows that the corresponding addresses are present in the respective memory areas, the information is deleted and the free marking of the respective facilities in the memory.

If they do not match, a diagnostic program is started, with the help of which all memory areas of the memory are searched, so too those which are unused. Are - * - information contained program the missing addresses in the Memory found, the relevant facilities are also activated. The missing addresses can be found in any case, since the memory is complete can be controlled with the word length of the addresses used, i.e. the memory has as many memory areas as this due to the specified word length are addressable. Appropriate measures are taken to prevent the addresses of facilities involved in a connection are intruded into memory areas, the facilities are assigned that are not involved in the connection in question are.

When a connection is triggered between a connection line Au and a subscriber station T are also proceeded in the manner described. The procedure is not limited to subscriber line switching, internal connection sets and line transfers, but also to electoral admission rates, operator stations, etc. applicable.

The frequency with which the diagnosis program is called can be determined by a counter to avoid blockages, it is also conceivable to use the Call up the diagnostic program in any case or only if one occurs frequently to report automatically to the superordinate service point.

L e e r's e lt e

Claims (1)

Procedure for avoiding blockages of individual connections Facilities P a t e n t a n s p r ü c h procedures to avoid blockages of connection-specific facilities in an indirectly controlled telecommunications, in particular telephone switching system with a memory with the connecting lines and memory areas permanently assigned to the connection-specific facilities, in which in the course of a connection setup in addition to further information, for example Operating states, the addresses of the others involved in the connection in question Connection lines and facilities are registered and this information is provided at d.the release of the connection.be deleted again, characterized in that upon detection of the release of a connection, the others involved in this connection Connection line and / or device (.IVS) is determined that then checked whether the address or addresses are in the relevant memory areas the other connecting lines involved in the connection (TAL, AL) or Facility (IVS) is or are included and that in the event of non-compliance a diagnostic program is started which, by searching the memory, finds the missing Address determined and the activation of the relevant connection line or Setup in memory initiated.