COURS PROTOCOLE HDLC PDF

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PROTOCOLES DE ROUTAGE: pour rôle l’échanges des informations de routes calculées par les Tâches d’une passerelle IP. Pour chaque datagramme IP qui traverse une passerelle, le protocole IP: . Niveau 2: HDLC. Niveau 3: X In this course, we discuss peer-to-peer protocols and local area networks. Part one in this course is to answer the question of how does a peer-to-peer protocol. 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 .

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Bytes IT1 to TS31 each correspond to a channel or channel of different transmission.

cours protocole hdlc pdf to word – PDF Files

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.

Device for transferring binary data between a multiplex time division and a memory. So it was possible, even necessary, to deal separately with each channel, the multiplication of components 41, 42, 43 on several parallel tracks only offset by the permitted and configuration flexibility.

He suffers no advance FIFO 88 if the channel is empty, and is incremented otherwise. The insertion of the HDLC frames in the PCM format to the transmitter, then the receiver frames recovery entails having at each end of the chain of transmission of a specific system.

Consequently, the means 70 operate as follows: MIC coupler 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. The processing device preferably further comprises means for triggering the next cycle of the means for analyzing and processing words, after execution of the current word processing cycle.

The invention aims to provide an HDLC frame receiving system transmitted over PCM channels comprising means, common to all channels, analysis and processing of the frames, so as to avoid duplication of identical material means each channel, taking into account that each frame must undergo specific treatment.

FR Ref legal event code: However, of course, the scope of the invention extends to other embodiments, in which one can find a level of frame 2 ISO format replacement of HDLC combined with a multiplexing mode more formatted channels on the transmission link Alternate MIC.

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 The controller 76 thus receives in a very short time a byte 71 and a processing information that allows access without previous operations of this byte processing program.

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ES Kind code of ref document: This block is composed of 32 time slots 31, each of 8 bits: ES Ref legal event code: This counter 84 undergoes a reset 87 in the presence of ITO code.

cours protocole hdlc pdf to word

It should still as many processors 42 with memory 43, there are ways to cope with the needs for the analysis and processing of the received frames and messages they contain. The time saving is important since, to handle bytes arriving at the rate of one byte every prltocole.

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 6. L’avance a lieu en fin de cycle, ce qui permet d’employer des composants ordinaires. cougs

In a preferred embodiment of the invention, said means for analyzing and word treatment include, for addressing said channel information memory, determining means of the channel number of the received current word, cooperating with means for writing said channel information in the memory and reading of said means to channel information of said transcoding means.

AT Date of ref document: The data is transmitted in successive blocks of bits, being repeated endlessly, the type of the block shown in Figure 3.

As shown in Figure 9, this information is available in the last third of a time interval of ns at the expiry of which the controller 76 comes to play back. According to another advantageous characteristic of the invention, said information processing provided by the protocolw means is constituted by a branch address from the processing machine, thereby providing the address directly processing curs to be applied on the ‘byte received.

System according to claim 1 characterised in that said transcoding means 80 comprise a read-only memory. Multiplexer and demultiplexer for bit-oriented datenuebertragungssteuerungsprotokoll. Le processeur de gestion 61 comporte en outre d’autres fonctions: La fin du signal 96 produit le signal transitoire 88 qui provoque l’avance du compteur de voies Method for handling redundant switching planes in packet switches and a packet switch for carrying out the method.

Method and apparatus for converting data packets between a higher bandwidth network and a lower bandwidth network having multiple channels. Another object of the invention is to provide such a system for receiving and processing frames, together with a standard processor, reduces the execution time of repetitive frames of analysis. Such data switch is for example constituted by a multibus multiprocessor system wherein one can distinguish: The existing system is fully operational, but has the disadvantage of the multiplication of components as many components as assaultand management resulting complexity.

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FG2A Ref document number: Advantageously, said transcoding means cooperating with said controller comprising: If the length of the frame does not correspond to a possible case, the system starts in ER error processing.

The address is composed, as shown, the signals 79, 72, 78, characterizing the state or type of procedure applied to the channel concerned INFthe number of bytes received since the beginning of a frame current ROCif applicable, a status information which depends on the circumstances of the delivery of the byte received prltocole should be in the frame 90 to 93 according to the table provided beforehand, and the state, occupied or empty, the FIFO as described above.

MIC coupler is connected to two buses 52, 53 from the data switch by means of two isolation circuits 62, the type of buffer tristate circuits, controlled by the control processor IT Free format text: The transcoding memory 80 works in cooperation with the following modules: The field of the invention is that of data transmission in the telecommunications sector, according to the ISO standards track cokrs, particularly according to the levels 1 and 2 of the standard.

AT Free format text: Taking into account the rank of the current byte is used to selectively address each of the received frames as a function of its length. More specifically, the means 70 emit each received PCM frame, one byte 71 for each of the 32 channels of the PCM link.

System according to any one of claims 1 to 9 characterised in that said processing information 81 supplied at the output of said transcoding means 82 is a logic address for branching to a processing program.

The invention also aims to provide for such a system, a wired device, simple design, fast operation, and supports the cohabitation of different procedures simultaneously on the PCM channels eg CCITT n7 and X Hflc according to claim 1 characterised in that said word analysing and processing means 74 comprise a memory 85, 86 for channel data 71 addressed by means 84 for determining the channel number of the current receive word and cooperating with coours 90 for writing said channel data in the memory 85, 86 and means for reading said channel data 79 for further processing by said transcoding means Country of ref document: The embodiment of the inventive system will be described more precisely in relation to a data switch as shown in Figure 5.