SU736155A1 - Discrete information transmitting system - Google Patents

Description

The invention relates to the field of data transmission.

A device for controlling data transmission, in which there is no memory block, in connection with which the transmission is carried out in whole messages without dividing into code combinations [1].

This puts forward special requirements for data terminal equipment (DTE) and makes it difficult to transmit long _<0 messages due to an increase in the number of interrogations.

Also known is a digital information transmission system in which there is a memory in the device. Message when _{pe-) 5} is divided into soap has codewords. The frequency separation of the information and return channels is used, and at the end of the transmission I form ^ ³ additional code combinations £ 2].

However, the presence of additional combinations reduces the transmission rate of the cod; kih messages.

Closest to the invention in technical essence is a device for transmitting discrete information containing a pairing unit, the output of which is connected to the first inputs of the reliability enhancer and the memory unit, the first output of which is connected to the input of the interface unit, the second output and input of the memory unit are connected to the second input and the first output of the reliability enhancement unit, respectively, the third input and second output of which are connected to the input and output of the device, the fourth input of the reliability enhancement unit is is dined with the first output of the control unit, the input of the mode switching unit is connected to the first output of the message generation unit, the reliability enhancement unit is connected by two-way communication with the communication line [3].

The known device has two modes of operation: for transmitting short and long messages. Short messages are transmitted in one code combination, moreover, the transmission is carried out by combinations of variable length without using a memory block of the data transmission equipment (ADF), and the return channel is allocated using a temporary method.

Long messages are divided into constant-length code combinations. The reverse channel is allocated using the frequency method.

Changing the operating mode is carried out under the control of the data terminal equipment depending on the length of the message.

A message in the form of a code ^ combination is sent from the device connected to the information source to the device connected to the information receiver. If it is correctly received on the source side, an acknowledgment is sent (reverse polarity decision signal) to the source information channel, which arrives at the device for transmitting discrete source information with a delay relative to the end of the information sending equal to 2 t у.п- Here t jan ~ signal propagation time; BY LINK.

where Li is the bond line length, Vpc.cnр. signal propagation speed. In the calculations, Vpacn η π 160 km / m s is taken.

The time required to complete the transmission of the message - ί yan Ή'ο.α,. (1) where To.s. - time of transmission of confirmation (time of transmission of the confirmation message.

With increasing message length, the number of interrogations due to interference in the communication channel increases, and therefore the average transmission rate decreases [4]. Therefore, transmitting long messages in this way is impractical. When transmitting long messages are sent through the information channel codewords postoyal- - _Ω hydrochloric lengths, which follow one another directly. Feedback signals are sent via a narrow reverse channel and are transmitted to the device connected to the information source with a delay. The feedback signal is integrated during the time t _SIP1 . and analyzed at the end of the transmission of the next code combination t IN. Hi. T 1 O.S.

If the transmission time of the code pattern is T _{and k} , then the analysis of the reverse channel signals in the transmitter · takes place through λ code patterns a ₌ I .1 * sfc ^f1 max * T.s. ]. where ί · zones.mak "~ is the maximum possible delay time of the signals in the communication line Г is the sign of rounding to the nearest whole integer.

If the number of bits of a long message is not a multiple of the length of the code ho'ibichatsii, then the last code combination is shortened. As soon as the moment of the analysis of feedback signals is fixed, the last code combination is supplemented with empty * '' characters. In addition, .I is sent to receive a feedback signal from the last code combination. additional code combinations filled with empty characters (empty characters. shaded}.

The completion of the transmission occurs after receiving the feedback signal. to the last code combination containing the information.

Considering that, on average, half of the bits are filled with information in the last code combination, then

Lavera M0.5 Λ) '£ .χ.

At Ά - 1, Tk.k. - 2 Psh1.msh.4 · T o.s, n Tuners.dl. ~ 3tjAn.MAx + 1 »5 Gr.s, 12;

When calculating s, the value of the maximum possible delay of signals in the communication line is used. Thus, the parameter determined during the design of the device should be selected for the maximum range that is specified by a number of regulatory documents

I = 13900km shah

¹³ J * ° 0 * 175 / m / s. At the same time, the real delay can be small. For example, at L = 300 KM 2 t Ts _YaP - 3.75 m / s.

As can be seen from (1) and (2), significantly longer time is spent on completion in the long message transmission mode than in the short message transmission mode.

OH 1 G7 ϋζ iο Ο ΙΟ

Information that arose after transmitting a long message will be delayed by _{величину 3σβρρω DL} if the device is used in a system: k, operating in real time.

The assignment of the transmission mode is assigned to the OOD. Therefore, in 00D before the start of transmission, the length of the transmitted message is determined. This means that with a known device only specially designed OODs can be used. In addition, the introduction of additional nodes in the OOD is undesirable, since the OOD is the most mass equipment in the system (the OOD group is connected to one ADF).

In short message mode, ADF memory is not used. This means that in the OOD - information receiver, unverified (dirty) information is entered, which at the end of reception is accompanied by an evaluation signal from the ADF (the signal is correct or incorrect). With this method, the OOD receiver has a memory for the entire message. OOD - the receiver has a memory for the entire message, allowing repeated access to it from the ADF (in case of re-requests). Note that if only long messages are transmitted, the memory in the OOD receiver and the source is not needed (the ADF memory is used).

The disadvantage of this device is the large completion time in the message data transfer mode, which delays the transmission of subsequent messages, the need to specify the ADF operation mode from the OOD and the use of the OOD memory when transmitting short messages, which imposes additional requirements on the OOD.

The purpose of the invention is to increase the speed and simplify the device.

This goal is achieved by introducing into the device a message analysis unit, an information availability unit, a write and read control unit, keys, the output of the interface unit is connected to the first input of the message analysis unit, the second input of which is connected to the third output of the reliability enhancement unit, the first output of the message analysis unit is connected with the input of the write and read control unit, the first output of which® is connected to the third input of the memory unit, the second output is connected to the first input of the message forming unit, the second output of unit a message display is connected to the second · input of the message generation unit, the third output of the memory unit through the information availability unit, is connected to the inverse input of the first key, the first input of the first and the inverse input of the second key are connected to the second! the output of the control unit, the first and second inputs of which are connected to the outputs of the keys, the first and second outputs of the mode switching unit are connected respectively to the second input of the first key and the input of the second key.

In FIG. 1 shows a block diagram of a device; in FIG. 2 - time diagrams of the operation of the device.

The device comprises an interface unit 1, a reliability enhancement unit 2, a memory unit 3, a message analysis unit 4, a control unit 5, an information availability unit 6, a key 7, a key 8, a write and read control unit 9, a message generation unit 10, a switching unit 11 modes.

The transmitted message is divided into code combinations. The feedback signal for the last A combinations (in Fig. 2 - combinations 4 and 5) over ^j0 are given over the information channel (signal 4). Feedback signals to the remaining blocks are transmitted over the reverse channel (signals 1, 2 and · 3). Since the time distribution is used when transmitting the feedback signal to the last combinations, the last combination is not supplemented by “empty” characters. In this case, the completion time becomes equal to:

1jji3e₽ui ~ ^ · tian. ⁺ T o.s.,

that is, significantly x! smaller than in a known device when transmitting long messages. The delay in the transmission of subsequent messages is eliminated.

Dividing the message into code combinations allows you to use the ADF memory block and eliminates its need. in OOD. Switching the operation mode according to the type of feedback used (frequency division, time division) is performed in the ADF upon completion of the transmission of a message from the OOD. Thus, active change of the mode of information transfer is not required from the OOD, thereby achieving the possibility of using standard OOD.

.7 .73 The device operates as follows.

When there is an infurmash from the OOP, it goes through the pairing unit 1 to the reliability increasing block 2, the memory block 3, and the message analysis block 4. When the availability of information from 00D is detected, the message analysis unit 4 sends a signal from its output to the input of the message generation unit 10, which supplements each combination with service signs. The latter from the output acts on the input of the mode switching unit 11. The switching unit 11 establishes a reaash of work with frequency separation of inform anion and return channels. The outputs of the block 11 switching modes connected to the inputs of the keys 7 and 8, respectively. The key inputs are connected to the output of the control unit B. Since the device transmits information, the nth signal from the output of the control unit 5 is supplied to the input of the reliability increase unit 2, and • there is no signal at the output of the control unit 5. In this connection, the operation of key 8 is permitted and the operation of key'7 is prohibited. Block 4 analysis of messages determines whether there is a sign of the end of the message. Such a sign in the form of a control or information signal exists in any OOD and is standardized at the junction. When a sign is detected, a signal appears at the first output of the message analysis unit 4 and the signal disappears at its second output. The output signal is fed to the input of the recording and reading control unit 9. The latter generates a signal, which from the first output goes to the input of the memory unit 3 and carries out the corresponding switching in the latter, which ensures the transfer of an incomplete combination. The signal from the second output of the recording and reading control unit 9 enters ⁴⁵ at the input of the message generating unit 10, which generates service signs that complete the message and controls the “mode switching unit 11. The latter switches the type of feedback (OS). If there is a signal from the flea 10 of the formation of messages block '11 mode switch includes a temporary OS, in the absence of a frequency OS. Signal c. one output ^{55 of the} block 11 mode switching effect on the control unit 5 through the key 8. Block 5 control. 55 8 singing a signal from its output switches the unit 2 increase confidence. In this case, the device enters the reception state.

When receiving information from the communication line, it enters the input of the reliability increasing block 2 and, from the output of this block, enters the memory block 3. From the output of block 2 of increasing the reliability, the information gets to the input of block 4 of message analysis. When information is received by the signal from the output of the message analysis unit 4, a message generation unit 10 is activated, which captures service signs in combinations. A signal is taken from the output of message generating unit 10, and at the input, mode switching unit 11 is set to work with the frequency OS. The control unit 5 is in position ^> they receive information, so the key 7 is allowed and the key 8 is prohibited. If a sign of completion is detected in the message, the message analysis unit 4 removes the signal from the second output ' ⁵ and the signal at the first output turns on the control unit 9 writing and reading. The latter performs operations similar to those described in the transmission of information. Block 11 switching modes ⁰ modes by a signal from block 10 of the formation of messages is set to work with a temporary OS. At its output, a signal appears setting the control unit 5 to transmit, to send a temporary signal, OS. This signal enters the input of the control unit 5 only after the information in the memory unit 3 is output to the OOD. When the memory unit 3 is freed, the signal at the output of the information availability unit 6 disappears. Removing the signal from the inverse input of key 7 opens this key, since it is a block. 5 control is in the receiving position. The signal from the output of the mode switching unit 11 through the key 7 goes to the input of the control unit 5. The control unit 5 is switched and on the fourth input sets the reliability enhancing unit 2 to the transmission position. The transmission of the temporary OS signal via the information channel begins.

The technical and economic effect consists in increasing the speed of message transmission (by 20% with an average number of characters in the message - 500), reducing the number of electronic boards and, therefore, the cost of the hardware AND-Micro.

⁹ . ⁷

Claims (3)

The invention relates to the field of data transmission. A device for controlling data transmission is known, in which there is no memory block, in connection with which the transmission is carried out by whole messages without dividing into code combinations 1. This places special requirements on the data terminal equipment (DTE) and makes it difficult to transmit long messages due to the increase in the number of re-interviews. Also known is a digital information transmission system in which there is a memory in the device. The transfer message is divided into code combinations. Frequency division of the information and reverse channels was used, and when the transmission is completed, additional code combinations 2 are formed. However, the presence of additional combinations with the speed of transmission of short messages. The closest to the invention in its technical nature is a device for transmitting discrete information, comprising an interface unit, the output of which is connected to the first inputs of the reliability enhancing unit and the memory unit, the first output of which is connected to the input of the interface unit, the second output and the input of the memory unit These are connected to the second input and the first output of the reliability increasing block, respectively, the third input and the second output of which are connected to the input and output of the device, the fourth input of the reliability increasing block Inonii upravletsh the first output unit, the mode switching unit input coupled to the first output formirova1sh message block, the block enhance reliability soe.ainen dvusporonnimi bonds with the communication line 3. The known device has two modes of operation: for transmitting short and long messages. Short messages are transmitted one; With a code combination, 373 npj-hchem, transmission is carried out with combinations of variable length without an automatic transmission unit of the data transfer equipment (ADF), and the reverse channel is implemented by a temporary method. Long messages are divided into code combinations of constant length aG1Ode.-. The reverse channel is made by the frequency method. Change 1 doesn’t work under jTrpaBJieiHieM data terminal equipment B depending on the message. : Soboshennen.oformlennoe in the form of code. ; kombinanii. sent from the device connected to the source of information to the device connected to the receiver of the information. In the case of correct reception to the source side, an information channel of the reverse direction is sent a confirmation (a decisive signal of the reverse polarity feedback), which goes to the device for transmitting discrete source information or is delayed relative to the end of the info-1 and equal to 2t, on-- Here is tjan. - time of propagation signal; software communication line. 1de 1.1 - for 1p-1a communication line. Vpcicpr. signal propagation rate. Vpacnp 5 is assumed in the calculations; 16O km / m Time, in order to reverse the transmission of the message Zowrsh, -. .with. , (l) where T oc, is the transmission time confirmed deh (transmission time of the confirmation parcel. As the message grows, the number of nepecificoB increases due to interference in the communication channel, and the average transmission rate 4 decreases with communication with the field. long messages in this way are impractical. When sending / dp messages, information combinations are sent along the information channel constant for others, which follow directly each other. The feedback signals are sent but narrowly to the return channel and sent to the device , sv zosh-goy with istoshnshshom inske ke PMI, with a range of 1) The feedback signal is integrated over time, the int is analyzed after the transmission of the next code combination is Tj ,, zap.mak, maximally BoaNiojKHoe repair.: lagging signals in jotHjH in G1 - sign rounding to the nearest whole large part of the list. If the number of bits of a long message is not a multiple of a code word, then the last code combination: is shortened. Since the moment of the sig1- analz (alo.of feedback is fixed, then the last code combination is filled with empty characters and signs, besides that, to receive the sigsal feedback on the last code combination is sent, Ya. Additional code combiners, zapol: e 1-ight characters let them be (empty for evil; shaded /. Completed hierodachn pzeo itho after receiving the feedback signal. For the last code combination) 1Ac.I1o, Contains information. Assuming that on average in the last code combination half of the bits are filled with information, then. JaBEpui-CO, With I - 1, T to ti, .l. T O. C, I T, ae.eru dd - atjAii.Mfl); - 1,0 T o.s. (2) .When calculating} isg (it uses to lead up to the maximum possible delay of signals in the link thus, the parameter that defined its design and design of the device; share; en; better for maximum distance. .o ..., the coahgr is given by the rp of normative documents TS13900km2 ,,, 2,175 / m / s. At the same time, the real delay may be slightly less. Mag.; L. at L 300 km 2 i nq - 3.75 m / s. As can be seen from (1) .and (2), the completion of the transfer of long messages in the NRND transfer mode -: about her time, than in the mode of sending short messages. The order arising after the long message has been received will be delayed by the value of T Bershl.dl, the device is installed in systems operating in real masiltabe. The transmission and transmission pe iaiMa is reset on the CAL. Therefore, in the DTE before the beginning the message is transmitted, which means that only a neuspectral device can be used with a known device. In addition, the introduction of additional nodes in the DTE is undesirable, since the DTE is the most massive equipment in the system {the DTE group is connected to one ADF). In the short message transfer mode, no memory is used. This means that the information receiver is entered unchecked into the DTE (a knowledge of the information, which at the end of the schedule is accompanied by a signal from the PA (the signal is correct, go wrong) - With this method, the DTE will complete the message on the entire message. The DTE has the receiver for the entire message before re-accessing it from the ADF (in case of retries). Note that in the case of sending only long messages, the memory in the DTE-receiver and the source is not needed (the ADF memory is used). .- big end time in mode The transmission of message data, which delays the transmission of subsequent messages, the need to specify the mode of operation of the ADF from the DTE and use the memory of the DTE when sending KOpoTifflx messages, which imposes additional requirements on the DTE. The purpose of the invention is to increase fast operation and improve the device. by introducing into the device a message analysis block, an information availability block, a write and read control block, a key, the output of the interface block is connected to the first input of the aiiaimsa block of messages, the second input It is connected to a third-party output of the reliability module, the first output of the message analysis unit is connected to the input of the write and read control unit, the first output of which is connected to the third input of the n-mti unit, the second output to the first input of the 4U unit of the message, the second output of the unit analysis of the message is connected to the second input of the block. It is registered, the third output of the memory block is connected via the information availability block to the inverse of the first key, the first input of the first and the second input of the second keys are connected to A control unit, the first and second inputs of which are connected to the outputs of the keys, and the first and 1x1 outputs of the relay switching unit are connected respectively to the second input of the first key and the input of the second key. FIG. 1 shows a block diagram of the device; in fig. 2 - timing charts of the device. The device contains an interface block 1, a reliability building block 2, a 3-unit block, a message analysis block 4, a control block 5, an information availability block 6, a key 7, a key 8, a write and read control block 9, a message generation unit , a mode switching unit 11. The transmitted message is divided into code combinations. The feedback signal for the last A of the com- battions (for phgg, 2 for combo 4 and 5) is transmitted over the information channel (signal 4). C. Feedback signals to the other blocks are transmitted on the reverse channel (signals 1, 2, and 3). Since the time distribution is used to transmit the feedback signal to the last combinations, the last combination is not supplemented with empty characters. At this time, the completion time becomes: ijisepiii - tbon. + OS T., i.e., substantially less than in the known device when transmitting long messages. The delay of the transfer is followed by iraijc. messages are deleted. Dividing a message into codewords allows the use of an ADF memory block and eliminates the need for it in the DTE. Switching the work mode according to the type of feedback used (frequency separation, time separation) is carried out in the ADF in fact from the transmission of the message from the DTE. Thus, an active change of the information transfer mode is not required from the DTE, which achieves the possibility of using standard DTE. 7.7 The device works in a manner. .In the case of injection from the OOD, it goes through the block 1 of the conjugation to the block 2 of the control unit, the block 3 of the memory and the block 4 of the analysis of the messages. When you have the availability of information from the DTE, the message analysis unit 4 sends a message to the input of the unit 10 of the message forming unit, which complements the combination; The last one from the output acts on the input of the block 11 of the switching modes. Block 11 is switched. establishes Renai l work with the partial separation of lufyurmashynnogo and reverse channels, Exit; block 11 pereslyuche-shre1 1ov connected to the inputs of keys 7 and 8, respectively. The inputs of the keys are connected to the output of the block S u1travle} sh. Since the device transmits information, the signal from the output of the control unit 5 is sent to the input of the 2 unit of new reliability, and the output of the uni-block 5 is not connected to the CONNECTION link. And from this the work of the driver 8 is forbidden and the operation of the switch is forbidden7. The message analysis block 4 defines a nonsing 1 termination message. Such a sign in the form of control itiero n.ll information signal exists in any DTE and standardizes with at the junction. When a sign is detected, the s signal rises at the first output of the analysis unit 4 and the signal at its second output disappears. The signal from the output is jTi of its output to the input of block 9 by writing and reading. The last signal, which from the first output enters the input of block 3 and it and makes the last appropriate switch, which transferred some sort of polylidi. The signal from the second output of block 9 is locked by reading and reading: and the input of the block 1O is {\ normalized by the first message that forms the service; {the characters that complete the message and control the unit 11 to switch modes. The sequence switches the type of feedback (OS). A recipe from the block 10 of the form-shift control of the common block 11 of the switch-1P-E reciche includes a temporary OS, with the exception of the frequency OS. Signal with. one output of the switching unit 11 (the modes are carried out interactively on the block 5: control via KJOOH 8. The control unit 5 controls the signal 58 from its output to switch the block 2 to new reliability. At the same time, the device switches to the receive state. When receiving an injection from the C line This unit enters the input of block 2, increases confidence, and from the output of this block enters block 3 ngam. From the output of block 2, increases the reliability of informability enters the input of block 4 of message analyzers.When receiving information, the output of block 4 of message analysis is turned on The unit is formed by the Yuformiu Ovani message, the koshergy fikofuet service signs in the com- pany and X. The signal is removed from the output of block 10 Aorming messages, the input of the mode switching unit 11 is set to the operation mode with frequency U. The control unit 5 is in the receiving position, but is therefore allowed operation of the key 7 and the operation of the key 8 is prohibited. When a message is found in the message, the end of the message analysis block 4 removes the signal.h from the second output and a signal but the first output switches on the O control of writing and reading. The last statement is similar to those described by others and the transmission of information. The mode switching unit 11 according to the signal from the block 1O of forming the messages is set up for operation with the OC. At its output, the signal of the installation of the control unit 5 of the control 1 to transmit, for sending a temporary signal, the OS, appears. This signal arrives at the input of control unit 5 only after being outputted to the DTE information from block 3 of memory. When the memory block 3 is released, the signal at the output of the block 6 is disappeared and the j-information is removed. Removing the signal from the cross-country entry of the key 7 opens this key, as a block. 5, the control is in the receiving position. The signal from the output of block 11 pereyutiuchenk pewtnAiOB through key 7 gets to the input of block 5 control. The etching unit 5 switches and, on the fourth input, sets the confidence booster unit 2 to the transmission position. The transmission of the time signal of the OS over the information channel begins. . The economical e4x {) ect consists in increasing the transmission speed of messages (by 2% with the average number of characters in a message being 500), decreasing (The numbers of electronic boards and, therefore, I hundred} P 1 of the ADF-Micro equipment. 9 Formula of the invention A device for transmitting discrete information containing an interface unit, the output of which is connected to the first inputs of the assertiveness increasing unit and the memory unit, the first output of the memory unit is connected to the input of the power supply unit, the second output and the input of the memory unit are connected to the second socket and first out m of the reliability module, respectively, the third input and the second output of which are connected to the device input and output, the fourth input of the confidence block is connected to the first output of the control unit, the input of the revioB switching unit is connected to the first output of the message generation unit, which is different By the fact that, in order to improve the speed and simplify the device, a message analysis block, an information availability block, a control box for the ignition and a pair of keys, an output of the interface block are entered into it, message analysis lock; the second input of which is connected to the third output of the confidence block, the first output of the message analysis block is connected to the input of the up5510 block by recording and counting h, the first output of which is connected to the third input of the memory block, the second output is connected to the first input of the message feed unit, the second output of the message analysis block is connected to the second block of the message generation block, the third block output is connected to the inverse input of the first key via the stator block, the first input of the first key and the inverse input of the second key They are connected to the second output of the control unit, the first and second inputs of which are connected to the outputs of the keys, the first and second outputs of the switching unit "cHNsoB" are connected respectively to the input of the first key and the input of the second key. Sources of information received in BKHMaioie during examination 1, USSR Author's Certificate t-k 449344, cl. G 06 R 9 / OO, 30.11.70. 2. For the Germany of Germany No. 1774053, cl. , 71. 3. USSR author's certificate Jso 6О8148, G OS С 19 / ОО, 17.О5.74 (prototype). 4, A. Pshenichnikov. Data transmission equipment APD-Micro. - Electric communication s N 8. 1975. 7zibrsr. T-tw : t.-j-Il ft-f-. -.- „L ..„ ..., A, .., 1 S rshence.- ntptdain ansrornats / w 3AJUH. Phi. 2