DE2343803B1 - Circuit arrangement for telephone systems with number conversion, in particular for telephone extension systems, for the identification of unconnected subscriber lines - 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 routing control 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 were not used and it could, for example, if the central control device does not take place Counter connections no complete counting functions are carried out.

The object of the present invention is to provide code identification switching means that are present at a central point except for the identification or marking of the calling or called connection point of a The connection path to be established can also be used for the identification of unconnected subscriber connections close.

This is achieved in that all unconnected subscriber connection points have a specific code point are assigned, via which only one code identification switching means is controlled and that when controlling only one code identification switch depending on the non-activated state of all others or all of a specific one Code identifier switching center assigned to group! switching center controlling the release of the connection! be switched on.

In this way, a special evaluation means can be switched on in the Activation of only one code identification switch take place. This criterion - activation only

• 25 of a specific code identification switching device - 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 number converter RU, the dialing evaluator W-ßW and the evaluation device AW belonging to the number converter RU , which is used to mark the selected subscriber lines by means of coded identification in a known manner, not shown. The common control device G-Est and the voting memory W-Sp are only indicated, which transmit their information to the election evaluator W-BW. 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 when it is complete and the end of dialing is accordingly marked in the common control device G-Est via the corresponding closed contact ikt and the contact 2gz and the contacts that correspond to the selected call number, a certain connection point of the call number converter RU. 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 HZE 220 . 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 switch. The evaluation of a current flow through such a wire takes place in

known way about one from a transistor and evaluation circuit existing in a relay.

If this mentioned connection point is activated for unconnected subscriber connections, the evaluation relay UED is activated via the magnetic core ED. With the contact 3t / «/, if no further evaluation relay is switched on, the isolating relay TR becomes effective in order to interrupt the connection and in particular to release the central control device immediately.

The magnetic cores are divided into groups according to the digit numbers. 4 magnetic cores are provided for each group, which means that the decadic dialed numbers are converted into binary identifiers. The magnetic cores HA. HB. HC and HD are assigned to the hundreds code numbers, the magnetic cores ZA, ZB, ZC, ZD to the tens code numbers and the magnetic cores EA, EB, fC and £ D to the unit codes. It is also assumed that with this identification, 2 magnetic cores (2 from 4 codes) are activated for each code number of a certain point, as shown for the connection points 223 and 225. 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 digit relay has been switched on as the relay UED, it must not be a one- digit number, but rather an unconnected subscriber line, connection point HZE220 . This therefore ensures uniqueness and no one-digit number is lost for assigning key figures.

The contact chain via which the isolating relay is switched on consists of an "AND" function Contact chain. So this means if only one of the contacts of the chain does not function the other Contacts of the chain fulfilled, the isolating relay was not switched on.

1 sheet of drawings

Claims (2)

Patent claims: 1. Circuit arrangement for telephone systems with telephone number conversion, in particular for telephone extension systems, in which several code identification switching means transmit their information to a marker for controlling the connection through-connection and in which an identification of unconnected subscriber connections is provided, characterized in that all unconnected subscriber connections have a specific code point {HZE220) are assigned, over the only one Kodekennzeichnungsschaltmittel (ED) is driven and in that when driving only a Kodekennzeichnungsschaltmittels (ED) as a function of the non-driven state of all other (HA to HD: ZA to ZD; EA to EQ or all of a particular group (ZA to ZD) assigned code identification switching means switching means (UED) controlling the triggering 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 switch means (ED) by threading the code point assigned to all unconnected subscriber connection points (HZE 220) through only one specific magnetic core (ED) takes place.