SU1252970A1 - Device for determining conditions of lines of automatic telephone systems - Google Patents

Abstract

The invention relates to telecommunications and provides an increase in the number of monitored lines. The device contains two determinants I, a control trigger 8, a key element 9, an element OR 10, a counter of II pulses, a decoder 12. According to the pulses of the generator 13, they are clock-amp; (L From UU LU of a set Code of group B 8 jyv U y

Description

Pulses counter 1I pulses detects the address of the determinant 1 that is being polled at the moment, and the counter of 3 addresses in this identifier forms the address of the currently polled line. When the counter 11 generates the address of this determinant, the signal from the decoder 12 opens the valve block 4 and signals about the state of the II lines are sequentially fed to the multiplexer 2. The signal of the 1 line that changes its state goes from the multiplexer 2 to the trigger 5, setting it in 1. The signal from its inverse output is closed by the element And 7, ive

I

The invention relates to telecommunications and can be used to build line detectors for automatic telephone exchanges (PBX).

The purpose of the invention is to increase the number of controlled lines.

The drawing shows a structural electrical circuit of the device for determining the state of PBX lines.

The device for determining the state of PBX lines to N inputs contains determinants 1, each of which consists of multiplexer 2, counter 3 addresses, valve block 4, trigger 5, first 6 and second 7 elements, controlling trigger 8, key element 9, element OR 10, counter 11 pulses, decoder 12, generator 13 clock pulses.

The device works as follows.

On the second inputs of the multiplexer

2, signals about the state of the lines are received, and the first is the address of the line that is being polled at this moment. This address is generated by IC

3addresses under the influence of clock pulses. Counter 11 generates the address of the determinant I that is currently being polled. The trigger 5 and the control trigger 8 are asynchronous, RS-type, their outputs are inverse, the first input is the settings to 1,

the counter 3 of the address is fixed its address. At the same time, the signal 1 from multiplexer 2 through the element OR 10 sets the control trigger 8 to 1. With its inverse output, the signal O crowns the key element 9, and the counter 11 fixes the address. From the element OR 10, the external devices receive information about the change in the line state, and from counters 11 and 3, the number of this line in determinant 1 and the determinant number. Due to the introduction of additional m -1 determinants and their execution, the number of monitored lines is increased. 1 il.

the second is about. The valve unit 4 is opened by a signal 1 from the output of the decoder 12, when the address of the determinant 1 is formed in the counter I1.

In the initial state, the triggers 5 and the controlled trigger 8 in the state O and 1 will open the elements And 7 and the key one from their inverse outputs.

element 9. Element And 6 is closed.

Clock pulses, arriving at the counting inputs of counters 3 and 11, consistently increase their content (by I for each clock cycle). With

This n inputs of multiplexer 2 next are connected in turn to its output (in accordance with the address formed in counter 3), and the outputs of multiplexers 2 are connected.

through the block 4 of the valves to the inputs of the element. OR 10 (in accordance with the address formed in meter II). In the absence of changes in the line condition in this way, they are sequentially polled and there are no other changes in the operation of the device.

When the state of the line changes, the device operates as follows.

After in the counter 3 the address of a line will be generated. Having changed its state, 1 line goes to the output of multiplexer 2 and further to the first input of the trigger 5, in

as a result, it is set to one state and O from its inverse output closes element 7. And the counter 3 addresses is fixed. After the address of the determinant 1 is found in the counter I 1, it detects a line with an altered state on the output 1 of the decoder 12 corresponding to this determinant 12 on the socket 1, which will open the valve block 4 of this determinant. As a result, 1 from the output of the multiplexer 2 passes through the block 4 of the valve, the element OR 10, and sets the control trigger 8 to the unit

Claims (1)

condition. From the inverted output of the control trigger 8, the signal O closes the key element 9 and the counter 1 is fixed. In addition, 1 from the output of the element OR 10 enters the output of the device, informing the external control devices of the PBX about a change in the state of the line whose address goes to the outputs of the determinant 1 from the outputs of the counter 3 through the valve block 4 and from the outputs of the counter 11 (respectively lines in determinant 1 and determinant number). After this address, a signal is sent from the control device of the PBX to the inputs of all elements of AND 6 and the control trigger 8. However, this signal passes through only one element 6, which is prepared for opening by the signal from the output of the decoder 12, thus setting the trigger 5 to the zero state, as a result of which the element AND 7 opens and the counter 3 is fixed. Similarly, the counter 11 is unlocked after the control trigger 8 is set to the zero state. The device switches to polling the next line. Invention Formula A device for determining the connection of automatic telephone lines Compiled by A. Seselkin Editor A. Kozoriz Tehred I. Be re-Corrector S Shekmar v / Order 4632/58 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 Standards for N inputs, containing serially connected t-clock generator, key element and pulse counter, serially connected element OR and control trigger, the output of which is connected to another input of the key element, the decoder, the output of which is connected to the control input the main determinant consisting of a trigger, two AND elements, a valve block and a multiplexer, characterized in that, in order to increase the number of monitored lines, n-I additional identical ones are entered into it In this case, an address counter is entered into each of the n determinants, the outputs of which are connected to the inputs of the multiplexer and the valve block, the other input of which is connected to the output of the multiplexer and the first trigger input, the second input of which is connected to the output of the first element I And connected to the input of the address counter, the first input of the first element I is connected to the additional input of the valve block and is the control input of the main determinant, the outputs of the counter and mylc are connected to the inputs of the decoder, additional The output outputs of which are connected to the control inputs of the c-I additional determinants, the output of the clock generator is connected to the second inputs of the second elements And, the second inputs of the first elements And are connected to the second input of the control trigger and the corresponding code outputs of the blocks the valves are interconnected, and the signal outputs of the valve blocks are connected to the inputs of the OR element, moreover.