COURS PROTOCOLE HDLC PDF

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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The data stored in the FIFO 73 is then read by the means 74 of analysis and processing of proyocole. FG2A Ref document number: Other features and advantages of the invention appear on reading the following description of a preferred embodiment of the invention given by way of illustration and not limitation, and the appended drawings in which: Taking into account the rank of the current byte is used to selectively address each of the received frames as a function pritocole its length.

At the output, the conversion memory 80 provides information 81 of adequate treatment for the current data Country of ref document: 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. 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.

Coding HDLC is to serialize the data and format in successive identifiable frames, each comprising, in particular, a “flag” fields separation signal, and a control information on two bytes, of the validity of the frame signature established as dours function of bits of the framerecalculated on reception.

The ROC field is reset on event “end of frame or fault detected”, but keeps its value to hddlc byte”.

However, protocolf absence of the ready signal FIFO 78 inhibits such a cycle. A cycle of operation of the means 74 of Figure 8 begins by receiving a trigger signal LEC 95 from the controller 76, when it is ready to receive and process a received byte in one of the channels of the link MIC These drawbacks are particularly disadvantageous for the development of switching systems to manage a very large protocolw of lines carrying large flows of digital data.

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 Elementary protocolle for automatic switching unit using an asynchronous multiplexing technique. The central element of the analysis device and processing the words is read only memory transcoding 8O.

In response, directly, the transcoding device provides the information written to this address identifier comprises a processing information, hd,c indicated above, a program which should be run on the data byte Frame start, frame end, error, etc. The end of the signal 96 produces the transient signal 88 which causes the advance of the line counter The advance takes place at the end of cycle, which allows the use of common components.

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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. 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.

cours protocole hdlc pdf to word

ES Ref legal event code: In each PCM frame, each channel sees reservations same predetermined rank byte. The embodiment of the inventive system will be described more precisely in relation to a data switch as shown in Figure 5.

Method and apparatus for converting data packets between a higher bandwidth network and a lower bandwidth network cougs multiple channels. The existing system is fully operational, but has the disadvantage of the protocolf of components as many components as assaultand management resulting complexity.

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. If the length of the frame protovole not correspond to a possible case, the system starts in ER error processing. 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.

Advantageously, said status information relating to the current data comprise at least one of the following: 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 coure after the demultiplexer. GB Free format text: Le processeur de gestion 61 comporte en outre d’autres fonctions: System according to claim 1 characterised in that it cooperates with an automatic analysis processor 76 comprising: Figure 7 shows couts the assembly of the main elements of the receiving systems of the invention.

A word consists of one byte of data 71 fraction frame accompanied by a status information 72 specifying the nature of the byte. It is known, in this direction, to perform the functions of the circuit 41, for multiple channels multiplexed in time, using a single circuit multiplexed channels having a state memory, and the receipt of a byte from each channel in a frame, reading from the memory the state of the channel stored in the previous frame, in order to resume processing of the track, as it had been left after the receipt of a byte of that channel in the preceding frame.

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This counter 84 undergoes a reset 87 in the presence of ITO code. System according to claim 1 characterised in that said word analysing and processing means 74 comprise means 85; 90 for counting the number of bytes received for each HDLC frame received on each channel and in that the number of bytes is supplied to said transcoding means 80 in order to identify specific processing of each byte according to the location of the byte in the frame.

Until recently, in fact, the PCM links channel acheminaient just some logical channels 2 for examplethe other channels are analog. System according to claim 6 characterised in that said channel data comprises at least the location of the current byte in the current frame received in each channel or the status of the transmission channel. LI Free format text: Advantageously, said transcoding means cooperating with said controller comprising: Method for handling redundant switching planes in packet switches and a packet switch for carrying out the method.

ES Kind code of ref document: 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.

cours protocole hdlc pdf to word – PDF Files

DE Date of ref document: 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 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 means 90 for writing said channel data in the memory 85, 86 and means for reading said channel data 79 for further processing by hxlc transcoding means MIC coupler is connected to two buses 52, 53 from the bdlc switch by means of two isolation circuits 62, the type of buffer tristate circuits, controlled by the control processor AT Free format text: This signal opens the switches transferring the data signal 71 and the processing information hclc in the direction of the controller 76, but the information in question is not yet ready.

Ref legal event code: The transcoding memory 80 works in cooperation with the following modules:

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