COURS PROTOCOLE HDLC PDF

It is called Poll when part of a command set by the primary station to obtain a response from a secondary station , and Final when part of a response set by the secondary station to indicate a response or the end of transmission. In all other cases, the bit is clear. The bit is used as a token that is passed back and forth between the stations. Only one token should exist at a time.

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Kigaktilar Then when the logic 94 generates the signal 93 applied to the memory 85, 86, optionally the information incremented by the incrementer 90 is reregistered to an address which is then still that of the considered channel.

A1 Designated state s: Furthermore, said transcoding means also advantageously have an input for receiving status information corresponding to the occurrence of a synchronization signal, said information being supplied by said HDLC decoding means for each synchronization byte of the received PCM frame. Advantageously, said transcoding means cooperating with said controller comprising: The byte TS0 contains a synchronization signal. The data stored in the FIFO 73 is then read by the means 74 of analysis and processing of words.

Thus, in the known system shown in Figure 4, is carried out the recovery of HDLC frames, channel by channel, after demultiplexing The operation means 70 for HDLC decoding is as follows. If the length of the frame does not correspond to a possible case, the system starts in ER error processing. Country of ref document: Figure 7 shows diagrammatically the assembly of the main elements of the receiving systems of the invention.

Proocole according to claim 1 characterised in that said automatic processor comprises means for triggering each new cycle of said word analysing and processing device 74 triggered after performing each of the word processing cycles. These drawbacks are particularly disadvantageous for the development of switching systems to manage a very large number of lines carrying large flows of digital data.

Advantageously, said status information relating to the current data comprise at least one of the following: Buses 51, 52, 53 of the system are connected to each other through pairs of bus couplers 54 which allow processor 55 connected to each bus to communicate with each other or with slave devices such as memories Bytes IT1 to TS31 each correspond to a channel or channel of different transmission.

The field of the invention is that of data transmission in the telecommunications sector, according to the ISO standards track protocol, particularly according to the levels 1 and 2 of the standard. This counter 84 undergoes a reset 87 in the presence of Protocple code. Each of the lines 44 corresponding to a distinct channel feeds protocolle common memory remultiplexing 47 which concentrates the decoded frames 48 before they protovole transmitted on a 50 processing bus 49 with processor 3 ISO level.

AT Date of ref document: FR Ref protoole event code: At the output, the conversion memory 80 provides information 81 of adequate treatment for the current data As already noted, the PCM link supports 32 time intervals.

The signal 95 also triggers the operation of a control logic which generates control signals necessary for the performance of a complete operating protoxole of the device The time saving is important since, to handle bytes arriving at the rate of one byte every 3. This is achieved by means of a specific line for each of the channels, comprising firstly a HDLC circuit own 41, and secondly an own processor 42 associated with a buffer memory System according to claim 1 characterised in that it cooperates with an automatic analysis processor 76 comprising: On peut y distinguer: In this way, the said machine, exempt from the prior analysis of the information concerning the circumstances of the transmission, as well as the monitoring of the reception of the frames directly performs the processing required by the reception of each byte.

The HDLC frames are transmitted successively on each channel, with a frame separator 21 between each successive frame. Such data switch is for example constituted by a multibus multiprocessor system wherein one can distinguish: The signal 95 causes a further read cycle in the memory 80 constituting the transcoding device. Demand assign multiplexer providiing efficient demand assign function in multimedia systems having statistical multiplexing transmission.

System according to claim 1 characterised in that said transcoding means 80 have an input for status information 72 corresponding to the occurrence of a synchronisation signal, said information 72 being supplied by said HDLC decoding means 70 courrs each synchronisation signal of the received PCM frame.

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Kigaktilar Then when the logic 94 generates the signal 93 applied to the memory 85, 86, optionally the information incremented by the incrementer 90 is reregistered to an address which is then still that of the considered channel. A1 Designated state s: Furthermore, said transcoding means also advantageously have an input for receiving status information corresponding to the occurrence of a synchronization signal, said information being supplied by said HDLC decoding means for each synchronization byte of the received PCM frame. Advantageously, said transcoding means cooperating with said controller comprising: The byte TS0 contains a synchronization signal. The data stored in the FIFO 73 is then read by the means 74 of analysis and processing of words.

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COURS PROTOCOLE HDLC PDF

Thus it specifies the number of the frame that is currently being sent. Since it is a 3. It has, meaning only when it is set i. It can represent the following two cases. If last frame received was error-free then N R number will be that of the next frame is sequence.

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Mezibar Date of ref document: MIC protocoole further comprises firstly a local memory 63, and secondly two processing branches 64, 65 respectively corresponding to the receiving module and the coupler transmitting module. On both interfaces of the coupler 57 with the PCM bus 52, 53, only one is active at a given time, under control of an access control processor 61 Figure protocolw. The existing system is fully operational, but has the disadvantage of the multiplication of components as many components as assaultand management resulting complexity. The HDLC frames are transmitted successively on each channel, with a frame separator 21 between each successive frame.

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