SU907874A1 - Device for interfacing symplex radio channel with automatic exchange - Google Patents

Description

t

The invention relates to communications and can be used to interface a wired communication channel with a simplex radio channel.

A device for coupling a simplex radio channel to an automatic telephone station is known, comprising a transmitting unit, the first input of which is connected to the first output of the Receiving unit, the second output of which is connected to the first selective element and the first noporoBbw element connected in series, as well as the switching unit and the HP pulse generator

However, the known device provides relatively low mating accuracy.

The purpose of the invention is to improve the accuracy of the mate.

The goal is achieved by the fact that a differentiating circuit, an integrating circuit, a trigger, a switch and

a second selective element connected in series, a second threshold element, an additional integrating circuit and a time relay, the second input of which is connected to the first input of the switching unit, the output of the first threshold element and the inputs of the differentiating and integrating circuits whose outputs are connected respectively to the first and

10 second4 trigger inputs, the output of which is connected to the second input of the switching unit, the third input of which is connected to the output of the pulse generator, and the first output

15 of the switching unit is connected to the second input of the transmitting unit, the third input of which is connected to the input of the switching unit and the output of the time relay, the first output of the unit

The switching unit 30 is connected to the first input of the transmitting unit, the second output of the switching unit is connected to the output of the second threshold element, the additional output of which is connected to the fourth input of the switching unit whose second output is connected to the input of the receiving unit, the second output of which is connected to the input of the second selective element. The drawing shows a structural electrical circuit of the proposed device. The interface device of the simplex radio channel with the automatic telephone station contains a reception unit 1, the first 2 and second 3 electoral elements, the first 4 and second 5 threshold elements, a time relay 6, an integrating circuit 7, a differentiating circuit 8, a switching block 9, a trigger 10, 11 pulse generator, additional integrating circuit 2, switching unit 13 and transmitting unit 14. The device operates as follows about jpaaoM. In the initial state, the signal at the output of relay 6 is zero. Transmitting Vipok 14 is turned off, the PBX circuit (not shown) is open by block 13, block 11 is in standby mode. The radio agent, intending to establish a connection with the PBX subscriber, during the absence of the radio channel, clicks briefly (at least 0) for 5-1 sec) on the control transducer of his transmitter (not shown). With the euprom, a trigger signal is received in unit 1 (with a frequency of 2 × 10 ms and a frequency of 3 kHz), and when it is released, a reset signal (with a duration of 10 ms of the same frequency). The start signal passes through the first selective element 2 and causes the first threshold element 4 to be triggered, which causes the start of relay 6 for 1-2 minutes. Relay 6 turns on the power supply of the transmitting unit 14 and the PBX using the block 13. The ATC readiness signal (long beep) is sent to the transmitting unit 14 When a start signal is received, the reset pulse resets its leading edge through the differential circuit 8 resets the trigger 10 to the mode corresponding to the transfer mode . This impulse does not reach the other trigger input 10, since it is delayed by the integrating circuit 7, the integrating 7 and the differentiating 8 circuits, together with the rigger 10, are actually selections of the start and reset pulses, which distinguish the latter on the basis of x duration. Thus, the broadcast transliruts. PBX readiness signal - long beep. Due to the operation of generator II, reception mode is switched on for a short time (10 ms) by block 9. The radio subscriber reads the ATCt ready signal periodically interrupted for 0 ms. Next, the radio subscriber proceeds to dialing a number, for this purpose he again presses the tangent of his transceiver, which results in a 200 ms (3 kHz) tone mapping, in the receive mode, the received tone frequency (3 kHz) passes through the first selective element 2 and triggers the first the threshold element 4, which will fix the block 9 in the receive mode. Simultaneously, the sig signal from the first threshold element 4 enters the differentiating circuit 8 and the integrating circuit 7. Since the signal duration (transmission) is large, then after several tens of milliseconds the capacitance of the integrating circuit 7 is charged to the level corresponding to the trigger trigger 10, which will also fix block 9 in receive mode. With the end of the tone dressing, the first threshold element 4 is not able to hold block 9 in receive mode, however, this mode is retained due to trigger 10. Continuing to hold down the PTT switch, the radio dials the telephone number of the PBX subscriber, sending dial signals on the air ( 2.4 kHz 40-60 ms). These tones from the output of block 1 are posted through the second electoral element 3 to the second threshold element 5, which, in accordance with the order of the parcels, switches the dialing relay in block 13. Since there is an additional integrating circuit 12 in the reset circuit of relay 6 with a large constant time (1-1.5 s), the dialing pulses do not affect the operation of relay 6. After dialing and pressing the PTT keys due to a short tone burst

(3 kHz) trigger 10 switches to the mode corresponding to the transfer mode.

Thus, the radio subscriber can listen to the results of the connection (long or short beeps),

When the subscriber answers the subscriber, the radio subscriber by pressing the PTT button (by sending the receive mode enable signal) switches the ATC radio station to the receive mode (the processes are similar to those described above). When unlocked, the tangent of the ATC radio station automatically goes into transmit mode, i.e. typical simplex radio communication is carried out. With each push of the radiobutton tangent, the capacitance in the circuit of the relay 6 is recharged by the control signal from the first threshold element 4 to the initial level, thus achieving an arbitrarily long radio exchange. However, the transfer of information to one side cannot continue for more than 1-2 min. JB; otherwise, relay 6 will operate and break the communication channel, ensuring that the entire device goes to the 1st standby mode. At the end of the call, the handset of the radio subscriber must be placed on the telephone. In this case, the radio subscriber's transceiver remains on (due to the time relay) for 2-3 seconds, and the second tone frequency (2.4 kHz) is broadcast over the air for 2-3 seconds. This tone frequency (at times corresponding to the reception mode) from the output of block 1 through the second selective element 3 and the second threshold element 5 fixes block 9 in the receive mode. At the same time, this signal is fed through an additional integrating circuit 2 to the reset circuit of relay 6, which causes the entire device to switch to its initial state of duty.

The subscriber's call to the telephone station of the radio subscriber is carried out in the usual way (from the inductor call, the power supply of the radio station of the radio station PBX is activated). The remaining processes proceed similarly to the above.

The proposed device allows -. does not improve the accuracy of the interface and has a simple circuit implementation

Claims (1)

1. USSR author's certificate No. 604195, cl. H 04 Q 7/04, 1974 (prototype).