SU535585A1 - Data transmission equipment - Google Patents

Description

(54) DATA TRANSFER EQUIPMENT

element OR, and the counters are interconnected so that the outputs of each of the bits of the counters, except the last one, are connected to the inputs of the like bits of the subsequent counter, and the outputs of the bits of the last counter are connected to the inputs of the multi-input key element. The capacity of the counters is taken equal to or greater than the maximum possible number of questioning.

The drawing shows a block diagram of the proposed device.

The data transmission equipment contains an error protection device 1, a multi-input key element 2, which allows receiving a delay code from the counters and issuing it on the signal Read data to the terminal equipment, M identical counters 3-1-3-M, which count the number of repetitions of each block of information in the repetition cycle, and the element OR 4.

The error protection device 1 has exits 5-7 “No error,“ Error and “Request.

Data transmission equipment works as follows.

The received information from the discrete channel is fed to the input of RCD 1. If the information is received without errors, then all 3-1-3-M counters contain the number 0. In this case, each received without error block of information is accompanied by a pulse at the output 5 RCD, which, at the input of the counter 3 - M, rewrites the number "O into the multi-input key element 2. The received block of information is sent from the RCD to the data terminal equipment, and simultaneously with the multi-input key element 2, the delay code is Yes dimensional case "O. If an error is detected in the received information block, the RCD goes into blocking mode and requests the received information with errors.

At the same time, an impulse appears at output 6 of the RCD, which writes the number "1 to all counters 3-1-3-M. In systems with decisive feedback, the M last transmission of information blocks is repeated upon receipt of a request signal. If, during repetition, the first of the M repeat blocks is received correctly, then at output 5 the RCD receives a pulse transferring the number "1 from the ZM counter to the multi-input key element 2; from counter 3- (L1-1) - to counter-3-M, etc. After the transfer operation, in the first counter 3-1, the number "O" remains, and in all other counters - "1.

The read signal of the first of the repeated blocks from the multi-input key element 2 is given the number "1, as a result of which this block of information is delayed by a time equal to one cycle of repeating M blocks. If the remaining repeated blocks of information are received without error, then each of them is accompanied by a " 1 delay code. After receiving and receiving the last, M-th, repeated block of information without a clock, the numbers "O" remain in the 3-1-3-M counters. If, after correct reception of the first repeated block, the second block is received with an error, then the pulse from output 6 of the RCD will add the number "1" to all counters, after which the counters 3-2-M will contain the number "2, and the counter 3-1 -

the number "1, with all blocks of information received after two repetitions, are output with the delay code" 2.

When errors are detected in any of the remaining repeated information blocks, the device operates in a similar way.

When analyzing the next block of information on its service bits, a repeat request signal from the opposite station is encircled, followed by a repetition of previously transmitted blocks M, according to the decoupled data transmission system with decisive feedback, at output 7 of the RCD momentum recording the number “1 through the element OR

4 only in the 3-M counter, and the block of information in which the request signal is detected, gives out only after repeating the number "1 accompanied by a delay code, if it was received at the first repetition without

faults.

Thus, the proposed data transmission equipment together with each received information block provides the exact value of the hardware delay to the data terminal equipment, which increases the reliability. The importance of transmitting rapidly aging information.

Claims (1)

Invention Formula A data transmission device containing an error protection device and a multi-input key element, the control input of which is connected to the read input and the outputs to the delay code, which is designed to increase the reliability of fast aging data reception by registering hardware delays for each received block of information, the output "No error of the device is protected against errors, connected to the transfer inputs of M identical counters, where M is the number of information blocks in the repetition cycle, output" error of the device error protection is connected to the counting inputs M-1 of the first counters and with the first input of the OR element, the output of which is connected to the counting input of the last, L1-th counter, and the output "Request for an error protection device connected to the second input of the OR element, and the counters interconnected so that the outputs of each of the bits of all counters, except the last one, are connected to the inputs of the same-named bits, the next counter, and the outputs of the bits of the last counter are connected to inputs of a multi-entry key element. Delay code, .. - Blending T t , {., J Tt