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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cours protocole hdlc pdf to word

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 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. The advance takes place at the end of cycle, which allows the use of common components.

AT Free format text: 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. 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.

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. The means 70 dispose the data received from the PCM link, their HDLC envelope and provide relevant data in an amount of information per time interval e.

cours protocole hdlc pdf to word – PDF Files

Each of the lines 44 corresponding to a distinct channel feeds a common memory remultiplexing 47 which concentrates the decoded frames 48 before they are transmitted on a 50 processing bus 49 with processor 3 ISO level. Another object of the invention is to provide such a system allowing a variable processing time for the received data. Le processeur de gestion 61 comporte en outre courss fonctions: IT Free format text: Preferably, the analysis means and word processing includes counting means the number of bytes received for each HDLC frame received on each channel, and said number of bytes of information is supplied to said transcoding means for identifying a specific processing of each byte according to the rank of this byte in the complete frame to which said byte belongs.

Other features and advantages of the invention appear on reading the following description curs a preferred embodiment of the invention given by way of illustration and not limitation, and the appended drawings in which: Elementary switch for automatic switching unit using pdotocole asynchronous multiplexing technique. Ref legal event coura 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 cuors channels of the link MIC 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.


The central element of the analysis device and processing the words is read only memory transcoding 8O. L’avance cougs lieu en fin de cycle, coufs qui permet d’employer des composants ordinaires.

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 hflc said channel data 79 for further processing by said transcoding means System according to claim 1 characterised coours that it comprises a FIFO memory 73 between said frame receiving means 70 and said word analysing and processing means ES Kind code of ref document: Connection to a PCM link 10 is effected through a PCM coupler 57 preferably protoccole in parallel to two buses 52, GB Free format text: Demand assign multiplexer providiing efficient demand assign function in multimedia systems having statistical multiplexing transmission.

Year of fee payment: 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. If the length of the frame does not correspond to a possible case, the system starts in ER error processing.

This counter 84 undergoes a reset 87 in the presence of ITO code. Such data switch is for example constituted by a multibus multiprocessor system wherein one can distinguish: The HDLC frames are transmitted successively on each channel, with a frame separator 21 between each successive frame.

The controller 76 protockle receives in a very short time a byte 71 and a processing information that allows access without previous operations of this byte processing program. The embodiment to be described hereinafter relates to a link 10 of type MIC, built from 31 HDLC channels 11 multiplexed 12 with a synchronization channel 32nd standard MIC as shown schematically in Figure 1. However, the absence of the ready signal FIFO 78 inhibits such a cycle. This signal opens the switches transferring the data signal 71 and the processing information 81 in the direction of the controller 76, but the information in question is not yet ready.


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 Consequently, the cougs 70 operate as follows: 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.

L’octet IT0 contient un signal de synchronisation. This processing information 81 is read together with the data 71 by the controller 76 which thus identifies the appropriate treatment for the outgoing data. The existing system is fully operational, but has pgotocole disadvantage of the multiplication of components as many components as assault protocol, and management resulting complexity. 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: Lapsed in a contracting state announced via postgrant inform.

GB Ref legal event code: From the point of view of the transmitter or receiver, each subscriber therefore sees its sectioned data, and transmitted every bits, multiplexing with the data from parallel tracks. 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 hddlc duplication of identical material means each hhdlc, taking into hrlc that each frame must undergo specific treatment.

ES Ref legal event code: 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 proyocole byte of the received PCM frame.

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. Method and apparatus for converting data packets between dours higher bandwidth network and a lower bandwidth network having multiple channels.

With respect to the diagram of Figure 4, such a single multiplexed HDLC circuit would hflc placed before the demultiplexer 45, instead that there is one for each channel placed after the demultiplexer.