SU446061A1 - Device for priority service of messages - Google Patents

Description

one

The invention relates to a data transmission technique and can be used in message switching devices.

A device for priority service of messages is known, containing C5 blocks for combining signals, AND schemes, IDNs, as well as a polling unit and a register associated with a control unit, input drives, whose information outputs are connected to an address decoder associated with output accumulators. .

The flow-through outputs of the polling unit are connected to the register inputs and inputs of the input accumulators, the indicator outputs of which are connected to the prohibitor input of the polling unit through the first signal combiner and the output accumulators are connected to the control unit through the second signal combiner.

However, in such a device, the service time of messages with high priorities is long.

The purpose of the invention is to improve the speed of service of the highest priorities.

This goal is achieved by the proposed device reversible counters of failures. The priority outputs of the input drives are connected to the same inputs of the MW circuits, or

0 inputs of which are connected to the outputs of the circuits, the one-day inputs of which are connected to the outputs of the corresponding reversible failure counters, and the other inputs ohm and the inputs of the revisional counters of the fire alarm are connected to the outputs of the control unit

The block diagram of the device shown in the drawing

 Device p priority

0 service message contains input drives I, signal combiner blocks 2-7, register 8, control unit 9, PWI circuits 10–12, reversible failure counters 13–15, circuits AND 16–18, de1 adressor I ca 19 J output drives 20 and 15 polling block 21, The device operates as follows. The message is usually divided into several blocks, with the first one (the address block; the message’s priority is indicated, and the recipient’s other service attributes. In the preloaded device, four priority messages are served. After the address block has accumulated, one of the signals indicating the priority of the message. These signals through the signal combining blocks 3-5 (depending on the priority) and the OR 10-12 circuit are sent to the control unit 9. From the polling unit 21, the call signals are sent out alternately the dew of the last accumulator I begins polling the first, etc. In one of the accumulators Ij, for example, first: .-; left; the address block of the message with the first one is accumulated (highest priority. When a signal is received Call information on the indicator output of the accumulator Through the signal combining unit 2, this signal enters the polling unit 21, and the polling of the accumulators pauses: I, From this moment, the address selection from the selected accumulator I begins. During the sampling process, the priority of the serviced signal is analyzed, V b Ther control priormtet 9 this is compared with the priority of other messages having removed all nako1shtel x I, If accumulators prisutstts I / soobp1eni are higher than an accepted message, then the priority br drive I not serviced. If there are no messages with higher priorities, then the information from the selected accumulator goes to address descriptor 19, where, in accordance with the address of the message, a call signal is generated from the output of a single storage 20. In response to this signal, a ready-to-receive signal is output from a certain storage 20 information (if drive 20 is not occupied). If the required drive 20 is busy, the signal is ready to receive information and no message is given to the message service provider. Along with the interrogation of the battery I, the analysis of the corresponding bits 8 is performed. Through the signal combiner 6, the content of the analyzed bit enters the control unit 9, If the signal of the presence of high priority is retained when failing, then the maintenance of messages with lower priorities is inhibited. This is unacceptable because for them the output drives may be free. Therefore, the signals of high priorities in case of the drives 20 addressed by them are removed, and these signals are stored in reverse ISIS failure counters according to the priority of the message (in this example, counter 13 of control unit 9, a signal is issued (STU). This signal is issued only if in register 8, the bit corresponding to the given drive I is in the state O, After the pulse has been issued, The first bit of register 8 is written by signal I-Vjj. Thus, on subsequent failures of this drive I, the contents of the corresponding register bit 8 is equal to I, and the signal to counter 13 is not output. If the transfer of information from the accumulator I to the accumulator 20 is enabled, the control unit 9 generates a signal 3 DL for subtracting the unit from the corresponding counter 13, provided that in the register 8 the corresponding bit is in a single state. After the done operations, perform polling The following drives I, and they are served similarly. When transmitting information from the input to the output drives, an analysis is conducted on the signal availability of the end of the message. If such a signal is detected; This means that one of the accumulators 20 has been released. From this point on, the priorities of the messages stored in the counters 13-15 must be taken into account. D this control unit 9 generates a signal. , opening the schemes and 16-18, and containing the counters 13-15 through the schemes OR GO-12 enters the control unit 9. At the same time, the number of the input drive, whose BpetviH service received the end of the message, is stored in the polling block 21. Upon further polling of the same accumulator, the polling unit 21 generates a signal for the end of the cycle, according to which And 16-18 closes. After transferring the address blocks to the memory of the control unit 9, the numbers of the input and output drives are being recorded, which produce the Exchange, t, e, the drives are fixed. SUMMARY OF THE INVENTION A device for a priority broadcasting message comprising signal combining units, AND, OR circuits, as well as a polling unit and a register associated with a control unit, input accumulators whose information outputs are connected to an output decoder associated with an output one and accumulator mi, with a zuskavdiye: the outputs of the polling unit are connected to the inputs of the register and the inputs of the input drives, whose indicator outputs are connected to the prohibitory input of the polling unit through the first signal combiner and the outputs are through the second block about the 5 signals are connected to the control unit, characterized in that, in order to increase the speed of service of the highest priority messages, the device contains reversible counts of failures j and the priority outputs of the input drives through cooTBew-st: common combining blocks C11 ... 7g are connected to one input module; they are connected from: the output of the Vr circuits, about 1 of which inputs are connected to the outputs of the corresponding fault counters, and the other inputs of the CI and inputs R Evens Counter Soybean bounce, dyne with outputs 6l (Pc control.