SU1506568A2 - Multichannel device for transceiving discrete information - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to improve noise immunity. The device contains matching blocks 1, transfer switch 2, control block 3, reception switch 4, output analyzer 5, interface block 6, code receiver 7, distributor 8, codec codec 9, independent codec codec, code operative storage unit 11 , address generator 12, buffer block 13, call selector 14, random access memory block 15. The goal is achieved by introducing an occupancy identifier 16 that stores information about the state of all outputs of the device by the time the reception of the conditional number is received, the imager 17 of the analysis time signal, which determines the state of subscribers exactly at that time when the reception of the conditional address has already finished, but by address buses of matching blocks 1, this address has not yet arrived, as well as the introduction of block 18 of analysis and blocking, which remembers the result of the analysis for the entire connection time at that channel position at which the device arrived ovny number. 1 il.

Description

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disconnect, block (interface with a line, code receiver 7, distributor 8, codec 9 codec channels, codec 10 codec channels, single storage unit 11, address driver 12, buffer block 13, call selector 14, memory block 15 random sampling. The goal is achieved by introducing a busy identity 16, which stores information about the status of all outputs of the device at the time of reception of the conditional

the number, the generator of the 17th si-nal of the moment of analysis, ensuring the determination of the state of subscribers exactly at that moment of time when the reception of the conditional address was already finished, but the address buses of the matching units 1 had not yet received the address, as well as the introduction of the block 18 analysis and blocking, which remembers the result of the analysis for the entire duration of the connection at the channel position at which the conditional number arrived. 1 silt

The invention relates to communication, can be used in telegraphy, data transmission, telemechanics for the formation of beams of switched channels and is an improvement of the invention according to the author. St. No. 915263.

The aim of the invention is to improve noise immunity.

The drawing shows the structural-electrical circuit of the device.

The device contains matching blocks 1, a transfer switch 2, a control block 3, a reception switch 4, a sniffer analyzer 5, a line interface block 6, a code receiver 7, a distributor 8, codec codec 9, independent codec channels 10, an optional storage unit 11, the address generator 12, the buffer block 13, the call selector 14, the random access memory block 15, the occupant identifier 16, the analysis moment signal generator 17, and the block 18 analysis and blocking.

The device works as follows.

The operation of the device is considered on a specific example, when it is used as a statistical multiplexer on a switched telegraph network and is switched on by groups of subscribers and subscriber panels of a channel switching station. It is assumed, for example, that the multiplexing of channels is carried out in accordance with the recommendation R 101 CCITT and the device sets are interconnected by a discrete channel with a capacity of 2.4 kbit / s, containing 47 channel positions, of which 45 positions (hereinafter referred to as positions channels) using0

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They are called to exchange information, and two are official.

One of the two positions, called the call position, is used to process calls arriving at the inputs of matching blocks 1.

In the output state from the address generator 12, addresses to the address inputs of matching blocks 1 are received only at the call positions of the address pulse, which reads the input low-speed information from the corresponding matching block 1 into a group discrete signal in the transmission and inverse transform it at the reception.

In accordance with the accepted algorithm for establishing a connection on the switched telegraph network, in the initial state, the signal of the starting polarity or logical O must be received from the subscriber and from the subscriber.

The transfer of the starting polarity to the abrnent in the initial state is ensured by the formation in the reception switch 4 of a logical O to the call positions and gating this O with address pulses in matching blocks. one.

The logic signals O arriving at the call positions in the group discrete signal from the matching blocks 1 to the call selector 14 are recorded by this call selector 14 as absence of a call. In this case, in the group discrete signal (in the information outputs of matching blocks 1), the signals of the logical O act on the channel positions, since in the initial state the address driver 12 at these positions does not generate address pulses. therefore

The transfer switch 2 provides at these positions the supply of logical O signals to codecs 9 or 10, which transmit this signal to the opposite side to the switching station. In the initial state, from the switching station side, the signal of the logical

The logic signals O arriving at the channel positions from the transmission and reception paths are recorded by the output analyzer 5, which holds the control unit 3, the code receiver 7 and the address driver 12 in the initial state.

Assume that, from the subscriber's i-ro side, the telegraph input of the corresponding matching unit 1 sent a call — a stop polarity signal (logical 1). This signal is transferred to the group signal at the call position. The call selector 14 registers the signal of logical 1 as a call and writes it into memory block 15 with random selection at the subscriber’s i-ro address. At the same time, the address of the i-th subscriber from the address generator 12 is entered into the buffer unit 13.

The control unit 3 continuously analyzes the channel occupancy. If a number (address) O is recorded at the channel position in the operational storage unit 11, the channel is considered free, otherwise it is occupied. When the first of the free channels (for example, i-ro) is detected, the control unit 3 at the corresponding channel position sends a command to the buffer unit 13 to read the address recorded in it to the operational storage unit 11 via the control unit 3. After the write-off, the buffer unit 13 is released to service the next call. As soon as the address of the subscriber’s i-ro is recorded at the position of the channel servicing the call in the operational storage unit 11, the control unit 3 marks this position as occupied and performs the following operations: erasing the logical 1 on the installation input of the memory unit 15 from arbitrary sampling at the address of the i-ro subscriber whose call is already served. This is necessary to prevent re-servicing of this call; the resolution of the formation in the address driver 12 on

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the pth position of the channel of the i-ro address of the subscriber, which ensures gating in the calling matching unit 1 of information on the transmission and reception at the pth position (connecting the calling i-ro subscriber to the pth position or the p-th channel interval) group channel; transmission via switch 2 transmissions, codecs 9 or 10, block 6 interface with a line over the p-th channel interval of the code signal — the conditional address of the i-ro subscriber on the opposite side to the station set of the device.

The conditional n imer signals of the subscriber i-ro, allocated at the output of the conjugation block 6 with the line of the opposite set, are fed to the first input of the receiver 7 of the code, are received by it and are recorded into the operational storage unit 11. From the operational storage unit 11, the conditional number signals arrive at the second Entry identifier 16 occupancy.

The occupancy identifier 16 stores information about the status of all outputs of the device at the time when the conditional number is received.

Shaper 17 of the signal of analysis provides formation of a pulse of analysis of the state of subscribers.

The analysis driver 17 provides for determining the state of subscribers at precisely the point in time when the reception of the conditional address has already finished, but this address has not yet arrived at the address buses of matching units.

The block 18 for analysis and blocking stores the result of the analysis for the duration of the connection at the channel position at which the conditional number arrived.

Further work proceeds as follows.

If the received conditional number stored in the operative storage unit 11 does not coincide with the Connection state, then the further operation of the device proceeds in the direction of establishing the connection; From the operational storage unit 11, through the address generator 12, the i-th conditional number goes to the i-th junction node, which ensures gating of the i-ro telegraph input / output for transmission and reception purposes.

Starting from this moment, a connection is established between the i-mi carts

rafny entrance exit of subscriber and station sets.

When a channel is established, the work of subscribers is no different from the usual operation of telegraph channels, the relevant recommendation R 101 (exchange of service and information signals),

Connection failure is produced under the condition that the initial state signal (logical O signal) is received at the inputs of the analyzer 5 is selected from the group signal of transmission and reception. Analyzer 5 selects the initial state and sets each of the sets to the initial state.

If the received conditional number stored in the operational storage unit 11 coincides with the Connection state, then the output of the analysis and blocking unit 18 produces a signal that blocks the conditional number from coming to the i-th joint and the output signal of the receive switch 4 (service signal ) through the switch 2 transmissions to the pth position of the channel of the group signal.

This ensures the absence of connection by the i-telegraph input-output of both sets; transmission of the service signal Zanto from station set to subscriber on the p-th position of the group channel.

Service signal A zoomed out, allocated on the i-M telegraph output of the subscriber set, goes to the subscriber and brings it to its original state.

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Claims (1)

Under the action of the signals of the initial state in the transmission and reception circuits, both sets of the device using the analyzer 5 return to the initial state, the key and the newly introduced block 18 of analysis and blocking. The device eliminates the possibility of disrupting the work of the subscribers in the connection and unauthorized access to information, which ensures an increase in the quality of the communication services provided, which is the main task in the communication industry. Formula from the source and Multi-channel device for transmitting and receiving discrete information on the author. St. No. 915263, characterized in that, in order to improve noise immunity, an analysis signal generator and serially connected occupancy indicator and blocking and analysis block are introduced, the output of which is connected to the auxiliary input of the address generator and the first auxiliary input of the transfer switch, the second auxiliary input which is connected to the auxiliary output of the receive switch, the second output of the distributor is connected to the second input of the analysis and blocking unit and the first input of the identifier is occupied and, the second input of which is connected to the write and read input of the address driver, the additional output of the code receiver through the driver of the analysis moment signal is connected to the third input of the analysis and blocking unit, the fourth input of which is connected to the installation input of the address driver.