DE2343803C2 - Circuit arrangement for telephone systems with number conversion, in particular for telephone branch exchange systems, for identifying unconnected subscriber connections - Google Patents

Description

The invention relates to a circuit arrangement for telephone systems with number conversion, especially for private branch exchanges in which several code identification switching means have their Transfer information to a marker for the control of the connection path through-connection and for which an identification of unconnected subscriber connections is provided.

In known telephone exchange systems with a number of, for example, 800 numbers, of which, for example, only a maximum of 400 are distributed to 400 subscriber lines, would have to be a call number plan spread over all 800 call numbers, the unconnected call numbers on one occupied-marked pseudo subscriber line are converted so that the central control by means of The »End of election« program triggers without any limit on the activation time. The busy indicator in the The evaluator level is without expansion of the electoral evaluator due to the limited number of pre-installed sub-program shunting relays not possible. With this type of technology is for each unconnected number a maneuvering effort per number of positions is necessary.

In contrast to the complex arrangement mentioned above, there would be a forced disconnection when not connected Call numbers time-dependent, since a connection cannot be established, triggering cause the central control device, the central control would be overloaded. As a result, essential functions of the central control device would not come into play and, for example, if the central control device does not take place, it could be Counter connections no complete counting functions are carried out.

The object of the present invention is to provide a central Place existing code tagging means except for identification or marking the calling or called connection point of a connection path to be established also for the identification to make unswitched subscriber connections usable.

This is achieved in that all unconnected subscriber connection points are assigned to a specific code point, via which only one code identification switching means is controlled and that when only one code identification switching means is controlled, switching means that control the triggering of the connection depending on the non-controlled status of all other or all code identification switching means assigned to a certain group be switched on.

In this way, a special evaluation means can be switched on in the Switching on only one code identification switching means. This criterion - activation only of a specific code identification scheme - is used to immediately trigger the establishment of a connection by responding to the isolating relay exploited without any action on the part of the calling party.

An exemplary embodiment of the invention is described with reference to the drawing.

An essential component is the Rufnummernumwerter RU, the choice of W-Reviewer BWuna the nummernumwerter to the reputation evaluation RU associated AW, on, takes place, the mark corresponding to the selected subscriber lines with coded marking in a known manner not shown. The common control device G-Est and the selection memories IV- Sp are only indicated, which transmit their information to the election evaluator WBW. With regard to the general functions of such a system, reference is made to German patent 1,211,283.

For example, the voting information is transferred from the voting memory W-Sp to the election evaluator W-BW . Corresponding units, tens and hundreds relays are provided there. A common group relay GE is assigned to all single relays and a common group relay GZ is assigned to all tens relays. The call number identifies a certain connection point of the call number converter RU if it is complete and the dialer is identified accordingly in the common control device G-Esf via the corresponding closed contact \ kt and the contact 2gz and the contacts that correspond to the dialed call number. Such a connection point is provided for each connection point, for example subscriber station.

In the present exemplary embodiment, all unconnected connections are assigned to the code point HZE220 . This means that each time an unconnected connection is selected, this connection point HZE220 is activated . Starting from this connection point, a wire is threaded through just a single core (ED) of all the magnetic cores present. Each magnetic core represents a code identification circuit. The evaluation of a current flow through such a wire takes place in

known way via an evaluation circuit consisting of a transistor and a relay.

If so this said connection point controlled for unconnected subscriber lines, the evaluation relays UED is driven via the magnetic core ED with the contact 3ued, the isolating relay TR is when no further evaluation relays is turned on, it is effective to interrupt the connection and release, in particular the central control unit immediately .

The magnetic cores are divided into groups according to the digit numbers, 4 magnetic cores are provided for each group, which means the conversion of the decadic call numbers into binary identifications.The magnetic cores HA, HB, HC and HD are according to the hundreds, the magnetic cores ZA, ZB, ZC , ZD are assigned to the tens code numbers and the magnetic cores EA, EB, EC and ED are assigned to the unit codes for the connection points 223 and 225 is shown. The magnetic cores are individually permanently assigned evaluation relays, of which only 3 are shown here as an example, namely UHA of the magnetic core HA, UHB of the magnetic core HB. UED of the magnetic core ED.

The switch-on circuit for the isolating relay TR is established via the normally closed contacts of the evaluation relay for the tens digit. This means that if no second numeric control relay has been switched on than the UED relay, it is not a one-digit number, but one that is not connected Subscriber connection, connection point HZE220 must act. This therefore ensures uniqueness and no one-digit number is lost for assigning indicators.

The contact chain via which the isolating relay is switched on consists of a chain of contacts fulfilling an "AND" function. So this means if only one the contacts in the chain do not fulfill the function of the other contacts in the chain, the Isolation relay takes place.

1 sheet of drawings

Claims (2)

Patent claims: 1. Circuit arrangement for telephone systems with number conversion, in particular for telephone extension systems, in which several Kodekennzeichschaitmittel transmit their information to a marker for the control of the connection through-connection and in which an identification of unconnected subscriber connections is provided, characterized in that all unconnected subscriber connection points assigned to a specific code point (HZE220) are about the only one Kodekennzeichnungsschaitmittel (ED) is driven and in that when driving only a Kodekennzeichnungsschaltmittels (ED) as a function of the non-driven state of all other (HA through HD, ZA to ZD, EA to EQ or all of a particular group ( ZA to ZD) associated code identification switching means, switching means (UED) controlling the release of the connection are switched on. 2. Circuit arrangement according to claim 1, characterized in that evaluation switching means (UHA to UED) are relays controlled via magnetic cores and that the control of a code identification switching means (ED) by threading the code point assigned to all unconnected subscriber connection points (HZE220) allocated threading wire through only one specific magnetic core ( ED) takes place.