DE712803C - Circuit arrangement for remote monitoring of a telephone station for operability - Google Patents

Description

Circuit arrangement for remote monitoring of a telephone station Operability The invention relates to a circuit arrangement for testing a telephone station on operability only by introductory measures the remote monitoring point.

There are known arrangements in which before the beginning. -the exam both Switchovers on the part of the monitoring station as well as the station to be tested of the monitoring staff. Need to become. This type of exam is very cumbersome and time consuming. In addition, in some telephone stations as a result of their inaccessibility, preparatory switching measures by the monitoring staff not run at all. It is also not possible to change @dii which that the monitoring staff conducts before an examination at the wards, consistently pass to let: as these disrupt normal telephone operations. It is therefore necessary to assign switching means to the stations from the outset, which ensure permanent test readiness secure the stations, but do not interfere with normal speech operations.

Such arrangements are also already known. However, since the test current to operate the test equipment in the station from the supervising office and the control stream sent from the station back to the supervising office via the If the same line cores run, the known arrangement has the disadvantage on that it is not possible to unambiguously determine an error. It can, namely it cannot be determined whether the fault is in the test equipment of the station or? n: the real one Telephone circuits lies. However, it is . important to -, know in which circle the disturbance lies in order to start with the elimination to be able to use the same immediately in the right place. `.

The invention avoids the above "named: yacht parts by that for the transmission of the test current between the monitoring point and the The station to be tested is electrically completely separated from the two telephone wires Circuit is established in which .ein assigned to the station to be tested Audio frequency generator responds, which by means of the telephone equipment of this Station: the transmission of the control current backwards to the monitoring point triggers on the telephone wires, and that switching means at the monitoring point Check separately the operability of the test and control circuit.

The accompanying figures represent exemplary embodiments of the invention represent, in which so-called. Magnetic stations, no battery is required for their operation is to find use. The magnetic systems are at such stations for Telephone and microphone: the same. The invention is based on such stations not restricted, it can also be used in battery-powered systems.

Fig. R shows an arrangement in which both for the test circuit a double line L1 as well as for the telephone circuit, which the two stations Sti and St., connects, a double line L2 (two-wire circuit) is provided. Station St. is checked for operability by station St. In the monitoring point St, the test circuit is closed by a switch T. A lamp in the test line or a measuring instrument I (at the station Sti indicates whether the test lead or test facility is OK. The signaling device I (responds when the test circuit is closed. At the monitored station St. there is an ohmic resistance Wi in the test circuit, from which the voltage for a Stunmer S, alarm clock or the like. Is tapped. The buzzer is hung in front of the Handset of station St. attached. So he tones the microphone and the telephone of the handset of station St. ,, if the key T on station St, is closed will. This is usually used to set the series with the resistor Wi in the test circuit Morse code lamp All lying at the station St. 'to' actuate. Whenever the lamp is switched on, the buzzer S also responds. The participant in the Station St. can then determine by means of its handset over the line L2 whether through the microphone of station St. the buzzer tone is transmitted back to stationSti will or not, whereby the correct working of the handset at the stationSt-, or the state of the line L2 is checked. will.

If both the microphone and the telephone of station St. are to be checked individually to ensure that they are working properly, a circuit as shown in Fig. A is used. A double line L is provided for the test device S, a double line L3 with a common conductor Y between L1 and L.3 for the telephone Te of station St., a double line L for the microphone IVIi with a common conductor X between L2 and L3 ( Three-wire circuit). The buzzer S tones both the telephone and the microphone of the station St .. The subscriber at the station St can control the microphone of the station St. 'in the telephone of his handset and the telephone of the station St. in the microphone of his handset. If, therefore, the faulty operation of a speech circuit is found, with this arrangement there is still the possibility of speaking via the other system, whereby this system must of course be used as a telephone and microphone at the same time. In order to protect the magnetic systems in the event of failure of the common line Y running between test line L1 and line L3, a fuse Si is switched on at station St, in front of the microphone. In order to be able to speak in two-wire circuit again during normal operation, points A and B are connected to one another.

Claims (1)

PATENT ANSP1tÜCHL: r. Circuit arrangement for testing a telephone station on operability only through switching measures from a remote monitoring station, characterized in that for the transmission of the test current -between the monitoring Point (St,) and the station to be tested (St.) one electrically from the two telephone wires completely separate circuit is established in which a four to be tested Station associated tone frequency generator (S) responds, by means of the telephone equipment ("lli, Te) of this station (St.) the transmission of the control stream backwards to the monitoring point (St,) triggers via the telephone wires, and that switching means (l @, Alli, Te) separately the operability of the test university at the monitoring point Check control circuit. 2. Circuit arrangement according to claim i, -characterized in that a common circuit for. Microphones and telephones (Two-wire circuit) or two separate, one ge; m@einsam.°_n wire (X) containing circuits for microphones and telephones (three-wire circuit) the two telephones and a separate circuit for the test equipment is formed. 3. Circuit arrangement according to claim 2, characterized in that that the test circuit has a common conductor (Y) with one of the speech circuits (e.g. L3). q .. Circuit arrangement according to claim i, characterized in that that in the circuit of the test device at the monitoring point one of the operating status Signaling device monitoring this circuit (lamp or measuring instrument I0) is arranged. 5. Circuit arrangement according to Ans.pru:ch i, characterized in that that as a test device at the monitored point in the test circuit, the telephone equipment @ This station hetönender buzzer, alarm clock or the like is provided, whose B: operating voltage is tapped at a parallel resistor.