DE2707669C2 - Circuit arrangement for a centrally controlled, time-division multiplexed telecommunications, in particular telephone switching system, with switchboards in which a busy display occurs - Google Patents

Description

The invention relates to a circuit arrangement for a centrally controlled, time-division multiplex telecommunications, in particular Telephone switching system with the telephone numbers of all connection lines involved in connections containing connection memory and with switching stations, in which a display of the Occupied state of connecting lines combined in groups by one corresponding to a group Number of display organs takes place, with the selection of the desired group via the operator station happens through group identifiers.

The switching places of telecommunications, in particular telephone switching systems are with so-called Busy lamp fields to display the busy status the subscriber lines equipped. Since the size of such a busy lamp field is based on spatial Reasons is limited, so problems arise in large switching systems when the Representation of the busy status of all subscriber lines should be possible.

This can be done once in a known manner in that the connecting lines are in groups are combined and each group is permanently assigned to an attendant console. Another well-known The solution is that each switchboard has the busy status of all connection lines Group can display on its busy lamp field if the group in question has previously been activated by means of a Group identifier has been selected by the operator console. The group selection takes place using group selection buttons. These can now be special group selection buttons or also the keypad already present at the operator console.

In the case of the known solutions, the one reported by the connection circuit was previously used to control the busy lamp fields of attendant consoles State of the connection line used. However, particularly in the case of large systems, this requires a high Expenditure on schaltungstechnischsn measures, since the connection circuits are not spatially central, but are arranged distributed within the switching system and the access from the part of the switching stations should be possible.

In centrally controlled telephone exchanges there is a cyclically circulating connection memory present, which contains the connection numbers of all connection lines which are currently connected to a Connection are involved. Within one cycle, the memory lines of the connection memory read out one after the other and establish a connection with the aid of the two connection numbers of a line established between the two connecting lines in question. In the case of time-division multiplexed telephone exchanges

treatment systems that work according to the pulse amplitude modulation method (PAM) are used, for example the connection numbers for controlling the voice switches, which connect the two connection lines within the the allocated pulse phase (time slot) via the common busbar.

The task is only to create a circuit arrangement for a busy lamp control in a time-division multiplexed manner Specify telecommunications, in particular telephone exchange, with as little interference as possible in the existing facilities are necessary.

This object is achieved in that the group selection via the keypad of the relevant Vermittlungspatzes takes place by putting the dialed digits as group identification in a first Memory are stored and those in the connection memory via a comparison device Connection numbers to their affiliation to the selected group in a second memory as busy are identified and that then the content of this memory together with the group identification are transmitted from the first memory to the attendant attendant for display. There all connection numbers involved in a connection in the connection memory of the central control device are stored, the information required for the busy lamp control is taken from the Memory content of this memory gained.

The advantage of the invention is also that for access to the connection numbers in the connection memory no additional measures are necessary, as the checking of the connection memory port numbers contained by the comparison device to the affiliation to the by the Group identifier in the first memory group each within a cycle of the circulating connection memory happens, always when a memory line of the connection memory to output the connection data (connection numbers) provided for switching through the connection between the relevant connection lines will. In this way, all changes to the busy cases are recorded, as a result of which to each Time also the current status of the busy cases by the display organs of the operator console is pictured.

A further advantage results from the circuit arrangement in that one with each switchboard this firmly connected place control is present in the central control device, and that the first Memory, the second memory and the comparison device are part of the space control.

Are now in a time-division multiplexed, centrally controlled telephone exchange for identification the connection lines use additional telephone numbers in addition to the connection numbers, d. H. the Connection number is not identical to the call number, so a circuit arrangement is made for this case proposed that the connection numbers in the connection memory by a downstream Correctors are converted into the relevant call number if the connection numbers are generally not identical to the respective call number for all end-of-line lines, and then from a comparison device for belonging to that in the first memory by the group identifier designated group are checked that the phone numbers of the selected group in a second memory are marked as occupied, and then the contents of this memory together with the group identifier from the first memory to the attendant console concerned for display be transmitted.

Further advantages result from the subclaims. In the figures is an exemplary embodiment Circuit arrangement according to the invention shown It shows

F i g. 1 the place control and the interconnection with the attendant console and the central one Control device,

F i g. 2 the additional looping in of a corrector in the arrangement according to FIG. 1.

In Fig. 1 shows the connection memory of a time-division multiplex telephone exchange VSP which contains the connection numbers of all connection lines involved in existing connections. One of the lines \ -n is permanently assigned for each connection; it contains the connection number of the calling connection line in the location RT and the connection number of the called connection line in the location GT. Each of the two places is further subdivided into the columns for the digits of the connection number, namely for ones (E) tens (Z), hundreds (H) and thousands (7?) In the following example it is assumed that the time-division multiplex telephone exchange is developed for more than a thousand connection lines and that the connection numbers are identical to the call number.

The connection memory VSP is activated simultaneously with the pulse phase or time slot, whereupon the line of the current connection is read out. The connection data consist, among other things, of the connection numbers of the calling and the called connection line, namely those that were assigned the present pulse phase for the duration of the connection. With the two connection numbers, the two voice switches permanently assigned to the connection lines in question are activated, which for the duration of the pulse phase connect the two connection lines to the busbar common to all connections. Since the pulse phases occur cyclically and the connection memory VSP is also activated accordingly, a continuous data stream occurs at the output of the same.

In the release FV, which is controlled with the control clock T of the connection memory VSP, the connection numbers RT and Cr offered in parallel at the input are switched one after the other to the output, so that in each case during a pulse phase at the output of the release FV, first the RT and then the GR port number appears.

The place controls PS are connected to the outputs of the release FV , a place control belonging to each switching place, which is permanently connected to this via the multiplexers MX 1 and MX 2.

The space control PS consists, among other things, of a counter Z, a release F, a memory GSP, a comparison device V, a release FR, a memory BSP and the multiplexer MX \. Further devices that are required for other key and lamp functions of the operator console PL and also belong to the console controller PS are not shown since they are not the subject of the invention.

If the thousands and hundreds digits are entered on the keypad to set up a connection between, for example, a connection line with an external call and a subscriber connection line after pressing the query key A , these two pieces of information are sent to the Zund counter via the multiplexers MX2 and MX 1 Release F. The counter is set to the first step with the first digit, whereupon the first digit is stored in memory location T of the GSP, which was released via the query button A , via the release F.

The release of the memory location H is done accordingly with the second digit by advancing the counter Z to the second step. Since each digit is expediently represented with 4 bits each, the release F and the memory GSP are designed accordingly for 4 or 8 bits. The thousands and hundreds digits (group identifier) from the connection memory reach the comparison circuit V via the release FV . Here, these two digits are compared with the digits that are stored in the memory GSP and also offered to the comparison device. Whenever there is a match between the two combinations of digits, the comparison device V delivers a release signal to the release FR, which then releases the tens and units currently present at its input for the memory BSP. These two digits therefore belong to the number group selected by the operator console (thousand and one hundred). The memory BSP, which is divided into rows (tens) and columns (ones), is controlled with the tens and units digit offered by the release FR and the bit addressed by the two digits is toggled.

While the control of the memory BSP takes place arbitrarily according to the offered tens and units for writing, the reading takes place in an orderly order, starting for example with the lowest digit (tens and ones ), namely with the working speed of the multiplexer MXX and MXT- Da aus For technical reasons this speed is not very high, the time for reading out the memory BSP is a multiple of the writing time, which is known to be the same as the working speed of the connection memory VSP Since, however, the multiplexers MX 1 and MX 2 are not only required to transmit the control signals of the busy indicator but also further control signals are to be transmitted, the busy information is written into the memory BSP during the time during which no control signals are being transmitted for the display field AZF . This is possible because the multiplexers are rigidly connected to the individual devices of the place control and the switchboard and the scanning takes place cyclically

During the transmission time of the busy information, the memory BSP is read out and the call numbers marked as busy are transmitted to the operator console, with each call number within the transmission time being assigned a specific point in time, i.e. a specific bit in the pulse telegram of the entire busy information, which corresponds to this bit each with a specific bit or memory location in the memory BSP, which was also controlled by the multiplexer for reading with tens and units. This information now reaches the display field of the operator console, via a control logic which controls the display element (lamp, light-emitting diode, etc.) marked in the pulse telegram, whereupon the relevant call number on the display field (AZF in the HG field) is visually occupied is marked. At the switchboard there is a memory (not shown) for the display field AZF for the fields T, H and HG , which stores the briefly transferred information until the next cycle.

Also within a scanning cycle, the thousands and units (group identifiers) stored in the memory GSP are transmitted from the multiplexer to the switching station, where this information is displayed optically on special fields and H of the display field AZF.

Since the memory BSP takes over the current content of the connection memory for the selected group (thousands and hundreds) with each cycle of the multiplexer and the memory BSP is read out again with each cycle of the multiplexer, the display field always shows the current status of the busy cases.

Not only the subscribers (subscriber lines) are via the connection lines, but also other exchanges, e.g. B. public switching centers (trunk lines) and also the switching stations itself connected to the telephone exchange. Each has an individual port number under which the individual institutions can be addressed. There too Trunks and attendant consoles can be involved in connections, they are located in such Cases also their connection numbers in the connection memory.

If the connection numbers of the exchange lines and switching stations are also arranged in groups, for example, the busy cases of the exchange lines can also be shown in a known manner on the display field AZF of the switching station. If there is a larger number of operator positions, a so-called supervisory position is superordinate to them. With special authorization, the operator can select the group identifier of the operator stations to monitor their busy status via their own display field.
By pressing the disconnect or terminate key, not shown, after the switching process through the switching station, the busy display on the display field AZF can be deleted again.

Now, however, it is also possible, outside of a switching process, to initiate the busy display of a specific group from the switchboard PL. To do this, press key B , then enter the desired group identifier using the keypad, which is then stored in the location control PS in the memory GSP released by key B. By pressing this key again, the memory GSP is deleted, whereupon the display on the display field AZF is erased because, due to the lack of group selection in the location control, no more occupied call numbers are marked in the memory ÄSP. The memory is also cleared by pressing the answer button A in the event of a call.
Now there can also be a requirement that for

In certain cases, the individual operator stations for the switching of callers can be divided into a specific group of connection numbers, ie the busy display of the selected group should remain independent of the operations at the operator station. In this case, the HB key at the operator console is to be pressed, whereupon the memory CSP is released again, but its deletion by pressing the query key A is prevented. The deletion can now only be initiated using the B key.

There are now also telephone exchanges in which, in addition to the connection number, each connection line is also assigned a call number. A connection line can be addressed from the outside via the telephone number, while the connection numbers (address) are used for all switching processes within the switching device. In this case, the connection memory contains connection numbers that are not identical to the call number. However, since the busy status display at the operator console is to be derived from the contents of the connection memory and this relates to the call numbers, each connection number must first be converted into the associated call number. This is done according to FIG. 2 with the corrector U, which is available once and connected to the release FV . The space controls PS are connected to the output and further process the call numbers offered by the corrector in a known manner.

For this purpose 2 sheets of drawings

230221/274

Claims (5)

Patent claims: 1. Circuit arrangement for a centrally controlled, time-division multiplexed telecommunications, in particular telephone switching system, with a connection memory containing the connection numbers of all connection lines involved in connections and with switching stations in which an indication of the occupied status of connection lines combined in groups is provided by a group corresponding number of display organs takes place, the selection of the desired group is done via the switchboard by group identification means, characterized in that the group selection takes place via the keypad of the switchboard in question, in that the selected digits are stored as group identification in a first memory (GSP) and via a comparison device (V) the connection numbers located in the connection memory are checked for their affiliation to the selected group and the connection numbers of the selected group in a second memory cher (BSP) are marked as occupied and that then the content of this memory together with the group identifier from the first memory (GSP) are transmitted to the attendant switchboard for display. 2. Circuit arrangement according to claim 1, characterized in that the checking of the connection numbers contained in the connection memory by the comparison device (V) for membership of the group identified by the group identifier in the first memory (GSP) takes place within one cycle of the circulating connection memory, and Whenever a memory line of the connection memory is provided for outputting connection data (connection numbers) for connecting the connection between the connection lines concerned. 3. Circuit arrangement according to claims 1 and 2, characterized in that for each switching station a fixedly connected space controller (PS) is present in the central control device and that the first memory (GSP), the second memory (BSP) and the Comparison device (V) e \ n are part of the place control (PS). 4. Circuit arrangement according to claims 1 to 3, characterized in that the connection numbers in the connection memory are converted into the relevant call number by a downstream corrector (UM) if the connection numbers are generally not identical to the respective call number for all connection lines, and then be checked by a comparison device (V) for membership of the group designated by the group identifier in the first memory (GSP) , that the call numbers of the selected group are identified as occupied in a second memory (BSP) and then the content of this memory together with the Group identification from the first memory (GSP) are transmitted to the attendant console for display. 5. Circuit arrangement according to claims 1 to 4, characterized in that the exchange of information between the space controller (PS) and the switching station (PL) takes place continuously according to the multiplex method, the reading of the second memory (BSP) being carried out within a certain period of time and the writing of the busy information ic the second memory takes place outside of this time segment and both time segments are each within a cycle.