SU1494240A1 - Device for automatic switching of communication signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the speed by reducing the switching time of the communication channels. The device contains control units 1 and 2, el-OR 3 and 4, el-AND 5,6,7,8,13,14 and 15, trigger 9, switch 10, counters 11 and 12, transmitter 16 commands and receiver 17 teams. The goal is achieved by reducing the likelihood of switching to a failed backup channel and reducing the delay time when switching to a reserve by simultaneously analyzing both paths of the backup channel. 3 il.

Description

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The purpose of the invention is to increase speed by reducing the time of switching the communication channels,

FIG. 1 is a structural electrical circuit for automatic switching of the communication channel; ira FIG. 2 and 3 are examples of the implementation of a transmitter and a reception of commands included in the device,

The DL5G interface of automatic 1 C1-1 key and communication channels contains the first and second blocks 1 and 2 of the control, the first and second IL1 elements 3 and 4, the first one - the fourth elements 11 5 - 8, trigger 9, switch 10, the first and BTopoii c Chetchiki 11 and 12, PLAT - seventh:; elements 13 and 15, the transmitter 16 commands and the receiver 17 commands,

The transmitter 16 commands (Fig. 2) contains four, registers 18 - 21, three switching elements 22 - 24, 3j eMeif r And 25, the generator 26 clock emulsov, the ring register 27 Cj: i, pnra n converter code 28,

Receiver 17 commands (FNG, 3) consisted of three registers 29–31, three elements 32–34 comparisons, shift register 35, clock generator 36: PULSE, counter 37, three elements 38–40 and element ShZh 41.

The device for automatic channel switching works from-; yu1d; i-1 way

In the original CC1 STATUS, information is transmitted and received on the main channel (C), the identity of which is received by the second control unit 2 of the control.

In case of OK control, the signal is present at the forward output of the second control unit 2 and the first inputs of the first I of the second elements 5 and 6, and if there is a fault OK, the second signal is neiicTBveT on the third inputs PYTO1-O of the seventh elements I 13-15,

From the correspondent station opposite (station B), a code combo box is received over the backup channel (RK), each of which consists of a proprietary and information word. The check words are accepted by the first block 1 of the control. If at 4240

If the EMC path is normal, then the control signal is active at the direct output of Peppy block 1 of the controller and at the corresponding inputs of the SECOND - 5th quarter1) of that AND 6 - 8 elements. In case of failure of the receiving path RK, the control signal acts on the inverse output of the first control unit 1 and the corresponding inputs of the first and seventh elements And 5 and 15.

In the case of operability of the receiving paths OK and RK, the transmitter of 16 commands on the control signal from the output of the second

15 elements And 6 transmits in the RC code combinations consisting of test words and the first information words — the reserve channel is operational.

When OK reception path OK

0 and a faulty receiving path RK, the transmitter 16 commands for the control signal from the output of the first element I 5 transmits to the RC code combinations of the check words and the second information words - the reserve channel is faulty.

Information words accepted by both stations (station A and station B). processed by receivers

30 17 teams. If the first infomash words are received, the control signal appears at the second output of the command receiver 17 and the first input of the sixth element I 14, and in the case of

35 reception of second informational words

the control signal acts on the first output of the receiver 17 commands and the first input of the fifth element And 13.

So on each side

40 (stations L and B) there is exhaustive information on the condition of the routes OK and RK,

If, for example, the quality of the OK at the station L is degraded (when the RC is correct), then the controlling signal from the inverse output of the second control unit 2 passes through the third and the third elements 14 and 7 to the third input of the 16 instruction, causing

5Q transmission of the third information words in the RC - Switch channel.

The number of third information words transmitted from station L is counted by the second counter 12, and the number received by station B is counted by the first counter 11.

When transmitting (receiving) a given number of these words on an output of the second (first) counter 12 (11), 55

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with the impulse transmitted through the first element 1SH 3 and a quarter element AND 8 to the input of the trigger 9 and causing a change in its state. With the change of the P1e state of the trigger, the peep occurs; - switching on of the switch 10 and the backup card becomes the main one.

The length of the switching delay is selected taking into account the possibility of channel self-healing. If OK is restored during this time, the signal at the inverse output of the second control unit 2 disappears and appears at its direct output. In this case, the second counter 12 is returned to its initial state by a signal from the output of the SECOND element AND 6.

At station B, the first counter 11 is reset to the initial state when the first or SECOND information word is received with a corresponding signal from the third output of the command receiver 17.

With simultaneous deterioration of the receiving path OK and any path of the RK and the output of the second element OR 4, an alarm signal arrives at the additional output of the device.

The transmitter 16 commands (Fig. 2) operates as follows. Registers 18-20 contain codes for three information words, and in register 21, the code for the test word. Using the switching elements 22-24, the outputs of the corresponding register are switched to the inputs of the code converter 28. Using the clock pulse generator 26 and the ring shift register 27, a cyclical transmission of the corresponding code combinations is organized. In this case, the code converter 28 performs parallel-to-serial conversion of signals, and at the output of element 25, when transmitting the third information words, pulses appear with a periodicity of code combinations that arrive further at the clock input of the second counter 12.

Receiver 17 commands (Fig. 3) operates as follows. Registers 29-31 recorded sample codes of information words. The received signal is recorded in the shift register 35, and at the end of the write cycle (code combination) the signal from the counter 37 operating from the synchronous generator 36 clock pulses.

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(Гро -awi1.-g: itts compare the situation in -. R men-; tx 32 - 34 as compared to P1 principle ;; g1 ifif an inon word with par:: wow ll. If it matches, the corresponding one from Element I 38 - AO Jir-- for setting the first counter; 11 is produced at the output of the element OR 41.

The purpose of the invention in the proposed device is achieved by reducing the likelihood of switching to a faulty backup channel and reducing the delay time when switching to a reserve by simultaneously analyzing both paths of the backup channel.

Claims (1)

Invention Formula A device for automatic switching of communication channels, containing two control units, two OR elements, four AND elements, a trigger and a commutator, the first and second signal inputs and the first and second signal outputs of which are the corresponding line inputs and outputs of the device, information inputs and the output of which is the third signal input and output of the switch, the fourth signal output of which is connected to the input of the first control unit, and the input of the second control unit is connected to the third signal input The output of the switch, and the first inputs of the first and second and third and fourth elements And are pairwise combined, characterized in that, in order to improve speed by reducing the switching time of communication channels, two counters, five, sixth and seventh elements, And, the command transmitter and a command receiver, the input and four outputs of which are connected respectively to the fourth signal output of the mutator, the first inputs of the fifth and sixth elements AND, and the clock and installation inputs of the first counter, the output of which is connected to The first input of the first element OR, the second input and the output of which are connected respectively to the output of the second counter and the second input of the fourth element And, the output of which is connected to the input of the trigger, the outputs of which are connected with control inputs al of the switch, the fourth signal input of which is connected to the first output of the command transmitter, three inputs and the second output of which are connected respectively to the first, second and third elements of the AND and the clock input of the second counter, and the direct output of the first control unit is connected to the first inputs of the third and four compartments And elements and to the second input of the second element I, the inverse output of the first control unit connected to the first input of the seventh and second -AJ ha IT F rV input perpchgo elements And, and) version the output of the second control unit is connected to the II c to the second inputs of the sixth And the seventh And elements, the direct output of the second control unit is connected to the first input of the second element And, the output of which is connected to the installation input of the second counter, while the output of the sixth element And is connected to the second input of the third element And, and the outputs of the fifth and seventh elements And connected to the turns of the second element OR, the output of which is an additional output of the device. tj