SU661831A1 - Multichannel data transmission arrangement - Google Patents

Description

The invention relates to communication technology. . A multi-channel device for data transmission is known, which contains a demodulator, to the input of which the receiving channel is connected, and the output is connected to the input of the distribution / storage unit, one of the outputs of which is connected to the transmitting communication channel l through serially connected. However, the known multi-channel device does not provide the high-performance P1L transmission capacity of the transmitting channel. The aim of the invention is to increase the transmission capacity of a transmission channel. For this purpose, a multichannel data transmission device containing a modulator, to the input of which a communication channel is connected, and an output is connected to the input of a distribution / distribution unit, one of the outputs of which is connected to the transmitting channel through serially connected modules the communication unit is entered for the automatic search of the connection queue to the input of which the transmitting communication channel is connected, and the first output of the block for the automatic search of the connection queue is connected to the control input the unit for connection, and the second output is connected to the synchronizer input of the modulator; in addition, the unit for automatic search of the connection queue contains a serially connected input demodulator and a node for the allocation of subscriber addresses, one of the outputs of which is connected to the first input of the OR element, and the rest: the outputs are connected to the corresponding inputs of the transmission start delay node, the output of which is connected to the second input of the OR element, to the third input of which the initial input input is fed, and the output element OR is connected to the first auxiliary input, and the installation output of the node for allocating another subscriber is connected to the second additional input of the transfer delay node, the third auxiliary input of which has a clock frequency signal, and the output is the first output of the unit to automatically search for a connection, the second output of which. An additional output K & to the demodulator, as well as between communication channels and the input of the demodulator output block for -connection, input. automatic search block Queues connecting channels enabled switch arranged, for example - as 1trehpolyusnogo-off. switch. - In FIG. 1 shows the structural electrical circuit of the device; in fig. 2 - time diagrams for the case of three subscribers. The multi-channel data transmission device contains a demodulator 1-, to the input of which the receiving channel 2 is connected, and the output is connected to the jr6 du ric rip unit yel yel n 6 - on the power supply unit 3, one of the outputs which via serially connected modulator: 4 unit 5 for connection is connected to the transmitting channel b of communication and blrk 7 for automatic search of the connection queue, the input of which is connected to the transmitting channel 6 of communication, and the first output of the block 7 of automatic search for the connection queue connected to the control input ohm of block 5, the second output is connected to the synchronization input of the modulator 4, and between the channels 2 and 6 of communication and the input of demodulator 1, the output of block 5, the input of block 7 to switch on the connection queue automatically .8 channels 2 and b, made, for example, in the form of a three-pole two-position switch. . . . Unit 7- for automatic search of a connection queue contains a sequentially connectedly single input demodulator 9 and node 10 for allocating subscriber addresses, one of the outputs of which is connected to the first input of the element OR AND, and the remaining outputs. connected to the corresponding inputs of node 12, the delay of the start of transmission, the output of which is connected to the second .. input of the element OR 11, the third input of which is given a signal of the initial input, while the output of the element OR 11 is connected to the first additional input and the output of the installation is a node 10 for the allocation of subscriber addresses is connected to the second additional input of the node 12 of the delay and transmission start. The third auxiliary input is provided with a clock signal, and the output is the first output of block 7 for automatic search of the connection queue, the second output of which is A to the additional output of the input demoulator 9. -. , FIG. 2a shows the time delays of the node 12 delayed transmission of the first subscriber in FIG. .26 message signals of the first subscriber in FIG. 2b, the time delays of node 12, the delay in the transmission of the second subscriber; in fig. 2d - signals of the second subscriber; on ig. 2D - Time delays node 12 Delay the beginning of the transfer of the third subscriber; FIG. 2e — third party message signals; in fig. 2g - message signals transmitted via the transmitting channel b of communication. The device works as follows. Demodulators 1 and 9 receive electrical signals from channels 2 and b of the connection and convert them to. corresponding information symbols. Modulator 4 converts the information from the source into electrical signals and sequentially transmits these signals to channel 2 or b. The distribution-cumulative unit 3 extracts from the flow -. From the central information management center, the information that is addressed to this subscriber generates a message from this information and sends it as it accumulates to the consumer, and also receives information about & the source generates messages and stores them until it arrives, the transmission queue. The node 10 for allocating subscriber addresses is a set of decoders and key elements. It determines the boundaries of the message transmitted over the transmitting channel 6 by a subscriber. in the direction of the central point, tie-in to the beginning of each message, the allocation and decryption of the address of the subscriber who is currently transmitting, and issuing signals corresponding to the allocated address to the inputs of node 12 of the transmission start delay. The transmission delay start node 12 consists of a shift register with a number of inputs equal to the number of subscribers in the system, clocked with a frequency determined by the transmission rate received in the system. Depending on the allocation in the node 10 to allocate the addresses of subscribers, the ONE of the inputs 12 of the delay 12 of the start of transmission receives a signal that writes a unit to one of the bits in the register of node 1-2 of the delay of the beginning of the transfer so that its signal on the second block 5 the switch connected its modulator 4 to channel b at a strictly defined time, corresponding to the occurrence of the queue. In order to avoid false modulator connections .4 to channel 6, each new signal of the output of node 10 to allocate subscriber addresses records one pre-set in the register node 12 delay start transmission. Saving previously recorded by other inputs

units produced by the Setup signal generated by the node 10 to allocate the addresses of subscribers at the time of assigning to the beginning of a new message before allocating the address.

In the first position of the switch 8

(see Fig. 1) channels 2 and 6 are connected in such a way that information from the central unit arrives at the input of demodulator 1, information from the modulator, 4 via transmitting channel 6 arrives at the central point ,. and the input of block 7 for automatic search of a connection queue is connected to transmitting channel 6 for analyzing the state of this channel b and determining the moment of occurrence of the transmission queue of its message. In the second position of the switch 8, information from all other subscribers is received at the input of the demodulator 1. the system, and the modulator output 4 is connected through block 5 to be connected to channel 2, which is connected to the inputs of demodulators 1 of all other subscribers in the system. In this position of the switch 8, the subscriber assumes the functions of a central point and can exchange information with any other subscriber of the system. Block 7 does not participate in the operation to automatically search for a connection queue in this mode, therefore the input of the input demodulator 9 is shorted to ground.

Consider the operation of the device when the switch 8 is in the first position in a system uniting three subscribers.

 Each message transmitted by the subscriber to the communication channel 6 contains the code of the beginning of the message marker (M), the address code of the subscriber (A) and the information part of the message (PSI) (see Fig.26, d, e) The marker and the address make up the address message group (AH) (see Fig. 2g).

Suppose, at time t, the modulator 4 of the first subscriber starts transmission over channel 6 (see Fig. 2f, g).

At time t, in nodes 10 to allocate the addresses of all subscribers, a message start marker is allocated and a signal Set 0 is generated, erasing all previously recorded units in all registers of nodes 12, the transmission start delay (see Fig. 2a, e, e).

At time tjj, in nodes 10. to allocate the addresses of subscribers of all subscribers, the decryption of the address of the first subscriber is completed. The inputs of the transmission start delay 12 are connected to the outputs of the nodes 10 for allocating the addresses of the subscribers so that the unit in the register of the transmission delay node 12 of the subscriber with the next number (in this case, the second subscriber) is written into the bit corresponding to the minimum the delay (in this case, G f., necessary for the first subscriber to finish transmitting the information part of his message. The third subscriber has a connection between the node 10 to allocate the addresses of the subscribers and the node 12 so that the unit corresponding to the signal after deciphering the address of the first subscriber is recorded at the input corresponding to the delay 2 f2 (see Figure 2d). The first subscriber has the unit corresponding to its own address written to the register of the node 12 of the transmission start delay, corresponding to the maximum delay T2 (see Fig.2a).

Thus, at the second subscriber, at the time t, a signal appears at the output of the node 12 of the delay of transmission start, by which the connection unit 5 connects the modulator 4 to the communication channel b (see Fig. 2c).

0

At the same time, the message transmission by the second subscriber begins (see Fig. 2d, g).

At the same time, the preliminary phasing of the premnik of the central point with

5, the modulator 4 of the second subscriber is not required, since the specified receiver is phased with the modulator 4 of the first subscriber, and the modulator 4 of the second subscriber is synchronized with the phase of the modulator 4 of the first subscriber via the center: communication channel b - demodulator -9 - module torus 4. Thus, the connection of the modulator 4 to the channel b occurs in the phased state.

At time point -tg in nodes 10

5, in order to allocate the addresses of subscribers of all subscribers, a signal of the Setup O is generated, erasing the unit start delays recorded earlier in the registers of the nodes 12 (see Fig. 2a, e).

0

At time tg, the registers of the node 12 of the delay. Transmission start delays are recorded by the corresponding inputs of the new units corresponding to the address of the second subscriber. In this case, the third

5 subscriber delay tt; At the first subscriber -. Delay 2. - Cs2 of the second subscriber T22 KTipix In the moment tg s the transfer -.

Chu second subscriber (see Fig.2g) and the third subscriber starts the transmission (see

0 fig.2e). In this case, the third subscriber modulator 4, previously phased modulo 4 of the second subscriber, is connected to channel b.

five

At the moment 3 nodes 10 of the allocation of addresses of subscribers of all subscribers, the address of the third subscriber is allocated, and the corresponding bits of the nodes 12 of the transmission start delay are recorded with the new units, and to the first subscriber - at the input corresponding to Myt 3 miM (see Fig.2a).

At time t, the second subscriber finishes the transfer (see Fig. 2e) and again

5 begins transmission first subscriber

(see Fig. 26), and then all the processes are repeated:

In the time interval to-g t. (E in FIG. 2, the situation is illustrated when a continuous flow of messages following each other and phased among themselves is received at the input of the receiver of the central point via channel 6 (see Fig. 2g)).

In the time interval of FIG. 2, the situation is illustrated when only one first ai6oHeHT transmits messages over link 6.

In the moment . the first subscriber (see Fig. 26) finishes the transmission and the second subscriber is allowed to start transmitting (see Fig. 2c) after a delay. In the absence of information, the second subscriber does not transmit. A signal from the output of node 12 for delaying the start of transmission through an OR 11 element in the register of node 12 for delaying the start of transmission begins to write down the unit corresponding to the maximum delay

22 - in this case, after the time Td, at the moment, the third subscriber is allowed to start the transmission (see Fig. 2e).

If the third. Subscriber does not begin transmission, then, c. time / through time TTj (after decoding the address's own iBeHHoro, permission is received. the first subscriber starts transmitting (see Fig. 2a, b).

At the time tg, all units recorded earlier in the registers of nodes 12 are erased to delay the start of transmission (see Figs. 2a, b, e), and at the time after the address of the first subscriber is decoded, new delays are set at all nodes 12

If there is no information at the moments presented by him (t., -T ,,, t2g) For all subscribers, signals from the output of nodes 12 to delay the start of transmission through the OR 11 elements are recorded on the inputs corresponding to the maximum delay of each subscriber to T22 23 -1 tda. (.Fig.2a, b, d).

In spite of long transmission interruptions, (the situation is illustrated in FIG. 2, in the interval, all subscribers are allowed to start the transmission. In case of lack of information, the negative signal on the feedback circuit through the OR 11 element returns to the input of the register of node 12 to delay the start of transmission, corresponding to maximum delay (points in time t, t on figv).

. At time t33, the situation is illustrated when all subscribers simultaneously and independently from each other, after a long absence of information, pressed the buttons for the initial entry of information into communication channel 6 (see Fig. 2a, v, e). In this case, the inputs of all

Node registers 12 to delay the start of transmission through OR 11 elements.

 Signals / Self-Tests.

.. maximum delay.

In this case, the subscriber earlier starts transmitting, to the input of the register of the node 12 for delaying the start of transmission of which the admission signal from the previously recorded unit arrives earlier (in Fig.2 the first subscriber).

The device increases the transmission capacity of the transmission channel 6.

Claims (3)

1. Multi-channel device for data transmission, containing a demodulator, to the input of which the receiving communication channel is connected, and the output is connected To the input of the distribution / storage unit, one of the outputs of which is connected through a series-connected modulator and a unit for connection to a transmitting communication channel / characterized in that, in order to increase the transmission capacity of the transmitting communication channel, a unit is inserted for automatic search of a connection queue, to the input of which the transmitting communication channel is connected, the first output of the unit for automatic search of the connection queue is connected to the control input of the unit for connection, and the second output is connected to synchronous modulating input. 2. A device according to claim 1, characterized in that the block for automatic search of the connection queue comprises a serially connected input demodulator and a node for allocating the addresses of subscribers one of whose outputs is connected to the first input of the element OR, a. the remaining outputs are connected to the corresponding inputs of the transmission start delay node, the output of which is connected to the second input of the OR element, the third input of which receives the signal of the initial input, while the output of the OR element is connected to the first additional input, and the zero setting output for allocating subscriber addresses the cd to the second auxiliary input of the start delay node, the third auxiliary input of which has a clock frequency signal, and the output is the first output of the block for -automatic Single prdklyucheni queue, the second output of which is an additional output of the input demodulation tsZra. 3. The device according to claim 1, which is that between the communication channels and the input of the demodulator, the output of the block for connection, the input of the block for automatic search connection queues include a channel switch made, for example, in the form of a three-pole two-way switch. Sources of information taken into account during the examination 1. U.S. Patent No. 3,793,448, Cl, lf9-15,; i974V From the CPU KZrugich donentan