DE1109744B - Emergency call transmission device for subscriber stations in a public telephone network - Google Patents

Description

Emergency call transmission device for subscriber stations of a public Telephone network The invention relates to an additional device to a per se well-known emergency call facility, which is individual subscribers of a telephone network allows you to automatically make an emergency call to a control center (police, Fire brigade). In such systems, it has proven to be advantageous at the same time as the alarm is given, the location or the location of the alarming intercom automatically displayed in the alarm center in order to avoid time-consuming queries. Even this task is already on various more or less complicated ones Because of been resolved.

Such is a circuit arrangement for the transmission of emergency messages via connecting line of telephone systems with dialer operation by means of a The telephone subscriber cannot normally replicate, more than ten power surges containing current impulse series became known in the evaluation of the special Impulse sequence a pulse transmission with tracking is provided over which a Triggers the drive detector switched into the actual emergency call loop will.

In the case of another emergency call facility that is used as an additional facility for Traffic auxiliary systems, e.g. B. Payphone, is used by one after destruction a push button accessible from a pane of glass actuates an automatic pulse generator, after the reporting of the location of the reporter, a talk-ready connection between the location and the alarm center automatically with the help of direct current and alternating current surges manufactures.

There is also a device known in which the manufacture of a Connection to an alarm center via three interdependent partial signals in takes place in such a way that the first partial signal from the alarm transmitting station inevitably is given as soon as this reports, and that the second partial signal as a return signal is given by the alarm receiving center, while the third partial signal is again from the alarm sending center goes out and automatically the alarm receiving center via type and Location of the alarm information transmitted.

Finally, there is a circuit arrangement for issuing alarm calls known on the subscriber line of a self-connecting telephone network, whose An essential feature is that switching means are provided in the exchange are which the establishment of an alarm connection only when sending a for making normal connections not usual number of power surges, for example of eleven power surges, enables the issuing of alarms by bodies responsible for Issuing such alarms are not authorized to make impossible.

In contrast, the emergency call transmission is for subscriber microphone units a public telephone network with an automatic impulse transmitter are equipped to call an alarm center and where still after the Transmission of the series of current impulses required to call the alarm center by a Additional device post-dialing pulses to identify the alarm location are issued can, according to the invention, characterized in that in this additional device a post-selection relay with drop-out delay due to a capacitor discharge it is provided that the test relay will only respond after the post-dialing pulses have been transmitted lets and thus initiates the connection, as is known, and that Furthermore, the one that is actually present in the emergency call transmission and bridges the speech cores Choke coil is replaced by a pulse relay, which in a known manner the loop current surges passes on as earth impulses via a vein of the speech lines.

Such an arrangement has compared to the known devices the advantage that you only have the additional expense of two relays and the exchange of one Existing choke coil against a pulse relay required to ensure a safe transmission the one for marking power surges at the alarm location are required power. Other additional facilities, such as an alarm receiver to absorb series of current surges beyond ten current surges, the use of a special drive or different types of current impulses (direct or alternating current), are not required for the additional device on which the invention is based. The installation itself is also very simple and can still be retrofitted without difficulty can also be carried out in existing systems.

The mode of operation of the device is based on the circuit diagram explained as follows: When picking up the receiver at the subscriber station, from which an alarm is to be sent out, the following current flows are established: +, c-wire, c112 contact, VI1 contact, T5 / 6 winding.

T responds and closes the following circuits via t111: +, tIII contact, R5 / 6 winding, Z112 contact, a III 2 contact Wi 1, - and parallel to this +, t III contact, h I 1, EI / 6 winding and further on in the known way to minus.

The relays R and E respond. This means that the Isolating relay H energized, which disconnects relay E via h I 1 contact. The E relay However, it is held for a limited time via the capacitor K 5, eII contact, winding of E on the familiar route to minus.

During the hold time of the E-relay, the post-dialing pulses are passed on by the pulse relay 1 in the following way via the a-wire after the alarm point: +, r II 2-contact, e 1-contact, i II-contact, a-wire to the alarm point . At the same time, the E relay is re-excited in pulses via the i I contact and the capacitor is recharged: +, tIII contact, il contact, e II contact, winding of E, zII2 contact and on the known way to minus. In addition, from + via t III contact, il contact, e II contact according to K 5.

This ensures that the E-relay is active during the transmission of the series of post-election pulses. Only after these impulses have been transmitted does it fall off and continues to bring relay H to drop out through the e1111 contact.

The 1/2 winding of the Address the C relay and, in a known manner, make the first call to the alarm receiving center pass on, while at the same time the dial tone on the I5 / 6 winding of the pulse relay is given. This is transmitted inductively to the 11/2 and I3 / 4 windings and passed on to the calling station. All further switching measures are then carried out as with the emergency call transmission without additional equipment.

Claims (1)

PATENT CLAIM: Emergency call transmission device for subscriber stations a public telephone network with an automatic impulse transmitter are equipped to call an alarm center and where still after transmission the series of current impulses required for calling the alarm center through an additional device Post-dialing pulses to identify the alarm location can be issued, thereby characterized in that in this additional device a in a known manner by a Capacitor discharge drop-out delayed selection relay (E) is provided, which the test relay (C) only responds after the post-dialing pulses have been transmitted and thus initiates the connection in a known manner, and that also the choke coil which is present in the emergency call transmission and bridges the speech cores is replaced by a pulse relay (I), which in a known manner the loop current surges passes on as earth impulses via a wire (a) of the speech line. Considered Publications: German Patent Nos. 1034 223, 936 759, 838 912, 510 580.