SU42601A1 - Telephone switch - Google Patents

Description

In telephone switches, a large number of complex relay systems are used to receive ringtones and picks, which, on the one hand, require relatively large powers, and on the other, a lot of damage due to misalignment.

The high power required to operate the ringing devices on country commutators makes it necessary to broadcast a call to long-range circuits using special relays, which are the weakest point of all long-distance amplifiers. Translating the call only through the amplifying part does not give any results, since the incoming powers are extremely insignificant and cannot be fixed without special amplification. Bypassing the call of several telephone intermediate amplifiers through the jet coils, although it will increase the power at the receiving point, compared with the power when transmitting the call through the amplifying part, but not so much that the linear relay works. The use of a dial tone allows the relay to be removed from the mentioned telephone intermediate amplifiers, but on the other hand, it requires complex amplifying receiving devices.

The present invention aims to create such an alarm system.

switch devices, which for their work would require neither high power nor a relay. Such a system will allow eliminating relays and call transceivers on telephone intermediate amplifiers, and simplifying the whole circuit by destroying almost all relays on suburban and local switches.

The essence of the invention is that the neon lamps used as signal lamps on the switches, with an extinction voltage significantly lower than the ignition voltage, are connected behind the jet coils to extinguish them while the subscriber removes the tube by reducing the voltage caused by the voltage in the reactive coils. coils, due to the current power of the subscriber's microphone.

In FIG. 1 shows a diagram of a long-distance calling device, and FIG. 2 is a circuit for selecting a cord pair of a manual telephone switchboard.

An inductor, tonal, or direct current call sent by subscriber D through reactive coils D bypasses the TPU-7 and TPU-2 telephone intermediate amplifiers and enters the external springs of the socket G, from which it goes to the bus and to the common ring relay P, and then via potentiometer / 7-

to the neon calling lamp B. The closer the voltage taken by the potentiometer from battery B is to the ignition voltage, the more sensitive the indicator. The mode is selected so that normally lamp B does not light up, and the incoming current from the line will add up with the battery voltage and exceed the ignition threshold, which will cause the lamp to ignite. The signal goes out only when the plug is inserted into the socket G and the power supply to the lamp stops.

In series with the lamp, a relay P activates the general call acoustic signal 3.

Breaker lamps OL- / and OL-2 through the cord contacts of the CC are connected in parallel to the jet coils RK-7 and RK-2. Lamps are selected with an ignition threshold equal to the voltage of the central bank and with a voltage of extinction equal to the voltage of the central bank minus the voltage drop in the jet coils resulting from the current supply of the microphone of the subscriber. In case it is desirable to use lamps with an ignition threshold higher than the voltage of the central bank, then an additional battery is switched on in series with the cord-contact (according to a scheme completely similar to the starting lamp B). The action of the bounce signals will be as follows. When the plug is inserted into the socket, the cord-contact closes, and since the ignition voltage of the lamp is equal to the –CB voltage, it will come on. The insertion of pins into the socket of the local subscriber of the lamp will not be extinguished, since the current consumption through the reactive coils will not be (the subscriber has a broken circuit, the bell is connected in series with the capacitor) and the voltage at the lamp terminals does not decrease. When the subscriber picks up the handset, the microphone power supply current will pass through the jet coils and create a voltage drop on them, reducing the voltage applied to the burglar lamp, below the extinction threshold. As a result, the lamp goes off. At the end of the conversation, when the subscriber hangs up, the current in the jet coil circuit will stop. This will cause an increase in voltage on the burglar lamp, which will come on. The lamp finally goes out when the contact cord is opened.

Turning on the local ringing signal is quite similar to turning on the B distant signal, with the difference that the potentiometer selects a mode in which the lamp ignites from battery voltage B when the subscriber is picked up, i.e. when the circuit is closed through the subscriber's microphone.

Thus, a switch with the signals of the proposed system will have only general calling and burglary relays, as well as relays associated with an occupancy sample circuit.

When equipping the telephone intermediate amplifiers 777J with bypass ringing reactive coils D (Fig. 1), it is possible to make a call with a direct current, which makes the system very stable, since it is possible to use a high voltage (220 V) from the TPU anode for the call (instead of the inductor 60 -80 V).

However, when calling with direct current from one battery, it is possible to mix telegraphic work going on phantom circuits at the time of a simultaneous call. The proposed ringing system, which requires a short-duration ringing impulse of insignificant power, will make it possible to avoid this drawback as follows.

A common battery VB (Fig. 2), which is connected in parallel to all workplaces of the switch, through call buttons H can be connected to the call capacitors VK. To make a call, the telephonist places the interrogation key on the call and presses the N button. By this, the VC capacitor with a voltage between the plates equal to the voltage of the calling battery VB will connect to the calling plug and, if the latter is inserted into the line jack, it will give the desired for firing a ring signal, a current pulse.

The subject matter of the invention.

Claims (2)

1. A telephone switchboard, characterized in that the neon lamps used as signal lamps with a damping voltage well below the ignition voltage are connected behind the jet coils to extinguish them while the subscriber picks up the tube by decreasing the voltage caused by the voltage drop in the jet coils, due to the current power of the subscriber's microphone. 2. In the switch according to claim 1, the use of the ringing capacitor VK, normally connected to the ringing battery and included in the line when you press the call button N. ifpnrS. W.Y  pz rf cc p l rk-g 4iF-iiH and in