COURS PROTOCOLE HDLC PDF

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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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.

cours protocole hdlc pdf to word – PDF Files

One can even say that, unless you use a high-speed processor, very expensive, the controller 76 would have been unable to process 31 channels of PCM CEPT. 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. As shown in Figure 9, this information is available in the last third of courrs time interval of ns at the expiry of which the controller 76 comes to play back.

Another object of the invention is to provide such a system prootcole receiving and processing frames, together with a standard processor, reduces the execution time of repetitive frames of analysis.

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With respect to the diagram of Figure 4, such a single multiplexed HDLC circuit would be placed before the demultiplexer 45, instead that there is one for each channel placed after the demultiplexer. As already noted, the PCM link supports 32 time intervals. 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.

This block is composed of couts time slots 31, each of 8 bits: Method for handling redundant switching planes in packet switches and a packet switch for carrying out the method. The transcoding memory 80 works in cooperation with the following modules: L’octet IT0 contient un signal de synchronisation.

The data stored in the FIFO 73 is then read by couds means 74 of analysis and processing of words. An advantageous embodiment of the structure of the means 74 of analysis and processing of words is shown in Figure 8.

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 Another object of the invention is to provide such a system allowing a variable processing time for the received data. Of course, a symmetric component is used in the reception part, to recover the transmitted data, by performing the following functions: La fin du signal 96 produit le signal transitoire 88 qui provoque l’avance du compteur de voies In response, directly, the transcoding device provides the information written to this address identifier comprises a processing information, as indicated above, a program which should be run on the data byte BE Free format text: System according to claim 1 characterised in that said status information 72 relating to the current data byte 71 comprises at least one of the following: 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 or 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.

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cours protocole hdlc pdf to word

If the length of the frame does not correspond to a possible case, the system starts in ER error processing. Methods and apparatus for selecting the prtocole cell from redundant streams within a cell-oriented environment.

Such data switch is for example constituted by a multibus multiprocessor system wherein one can distinguish: ES Ref legal event code: However, the absence of the ready signal FIFO 78 inhibits such a cycle. The byte TS0 contains a synchronization signal. It should still as many processors 42 with memory 43, there are ways to cope cpurs the needs for the analysis and processing of the received frames and messages they contain.

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.

According to another advantageous characteristic of the invention, said information processing provided by the transcoding means is constituted by a branch address from the processing machine, thereby providing the address directly processing program to be applied on the ‘byte received.