DE1115779B - Circuit arrangement for telecommunication systems, in which connections serving the automatic transmission of messages are established automatically - Google Patents

Description

The invention relates to a circuit arrangement for telecommunications systems in which the automatic Connections serving the transmission of messages are automatically established and the connections to be transmitted Messages after the connection has been established automatically from the calling station to the called one be delivered.

Such arrangements find z. B. Use in systems in which from certain points emergency messages are to be sent automatically. These messages are of interest depending on the type of emergency (Burglary, fire or the like.) Different receiving points, and the connections to these receiving points are monitored with the connection routes built on their functionality and freedom from dialing machines. Has a connection request been successful and is the selected one If there is a vacant space, the emergency call will be sent automatically after the selected participant has reported remote, while if the selected station is busy, the connection setup is repeated or a local one Alarm is triggered.

It is now conceivable that the selected position could be caused by errors occurring during connection establishment, z. B. by automatic delivery of a series of impulses during the free choice Setting of a group selector influenced by the series of current impulses or due to malfunction of the system par excellence, does not correspond to the body to which the message is to be transmitted is. Since the emergency call was sent to a wrong, but to an approved subscriber station a local alarm will not be triggered.

In telephone systems, in which in times of low traffic, z. B. in the night, automatic data transmissions from one subscriber station to another have to be carried out, there is also the risk that the data to be transmitted will be directed to a point for which the data is of no interest at all or to a point that - is it is that the data must be kept secret, be it for other reasons - the data must not be sent. In order to prevent this in systems in which measured values can be requested from a remote measuring location from an authorized location, it is known to send an audio frequency signal from the called measuring location to the calling subscriber, which triggers a return signal at the calling location, which, in turn transmitted to the called station, where the transmission of the measured values is initiated. The complexity of this known arrangement Circuit arrangement for telecommunication systems in which connections serving the automatic transmission of messages
be built up automatically

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Franz Etzel, Munich-Solln,

Herbert Töpfer, Unterpfaffenhofen,

and Alois Brandstetter, Munich,

have been named as inventors

on audio frequency receivers and transmitters is significant. When used in systems in which the connections are built up automatically, difficulties also arise that different Tone frequencies, the return identifier from the called station, dial tone and busy tone must be differentiated, which further increases the cost of selective switching elements.

The object of the invention is to avoid the disadvantages of the known arrangements. Is achieved this in that the transmission of the identification signal from the called to the calling station in The devices (name button, destination button, automatic dialing machine or the like) take the form of series of current impulses, which is assigned to the called station for the automatic establishment of connections.

An exemplary embodiment of the invention is shown in the drawing. A telephone system is shown, the connection paths of which can also be used to transmit data. There are subscriber stations TN 1 and TN 3 available, which are equipped with both a telephone set Fl or F 3 and devices Dl and D 3 for the transmission of data, while other subscriber stations, for. B. the subscriber station TN 2, are designed only as a remote subscriber station.

Regardless of whether a connection for data transmission or as a telephone connection

109 710/136

is to be set up, the same connection paths - call searcher AS, connection line VL, ... , line selector LW - ■ are used for both types of message transmission. A switch from one type of message transmission to the other type can be made at the subscriber stations TiVl, TN 3 through contacts ul or μ3. It can be done automatically at the called subscriber station.

Since the data is only transmitted at certain times of low traffic in order to avoid overloading the connection routes and these low-traffic times are generally during the night, it makes sense to automate the data transmission along with the connection setup required for this. The devices Dl and D 3 are then name buttons, destination buttons, call repeaters, automatic dialing machines or the like, which automatically set up a desired connection. An incorrect transmission of messages after a connection that has been made automatically due to errors in the system to a wrong destination is now avoided by calling a selected point, e.g. B. at the subscriber station of the subscriber TN 3, a relay E 3 is switched on, which initiates the transmission of an identification signal with its contacts 3. This identification signal is sent to the calling subscriber station, e.g. B. to the subscriber station TNl, and there triggers the transmission of the message to be transmitted if it corresponds to the expected identification signal of the desired location.

The identification signal can be received in the subscriber station TN 1, for example, by the relay E1 , which corresponds to the relay £ 3 of the subscriber station TN 3 , so when the subscriber TN1 calls , this triggers the return of the identifier signal of this subscriber. It goes without saying that different relays can also be provided for the various switching processes that are to be triggered. A previously agreed signal or the call number of the called subscriber can serve as the identification signal. At the subscriber station of the calling subscriber TN1, the expected identification signal of the subscriber to be called is stored as a precaution and compared with the then arriving identification signal. If, for example, the call number of the called subscriber is used as the identification signal, this comparison requires practically no effort, since storage of the call number of the called subscriber is already required for the automatic connection setup.

In the absence of the identification signal, i. H. even if the subscriber is busy or if the lane is busy, the connection establishment can be repeated as often as required. The repetition can also be done after a a certain number of connection set-ups for a counterpart at a certain time interval the certain time interval larger time range are exposed, and it is finally also conceivable that after a certain number of unsuccessful connection setups to the calling Subscriber station a signal is given or recorded.

Claims (1)

PATENT CLAIM: Circuit arrangement for telecommunications systems in which connections serving the automatic transmission of messages (e.g. automatic data transmission) are set up automatically and the bodies authorized to receive messages that can be transmitted automatically are assigned an identification signal which, when a connection is effectively switched through, between a calling and a called one Place is automatically given by the called place to the calling place and in this initiates the automatic transmission of the message, characterized in that the identification signal in the form of series of current impulses from the device (name button, destination button, dialing machine or the like) of the called place (TN 3) , which is assigned to this point for the automatic establishment of connections. Considered publications:
German patent specification No. 1 015 494. 1 sheet of drawings © 109 710/136 10.61