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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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 said transcoding means Elementary switch for automatic switching unit using an asynchronous multiplexing technique.

Kind code of ref document: FR Ref legal event code: Thus, in the known system shown in Figure 4, is carried out the recovery of HDLC frames, cojrs by channel, after demultiplexing 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.

More specifically, the means 70 emit each received PCM frame, one byte couurs for each of the 32 channels of the PCM link.

cours protocole hdlc pdf to word – PDF Files

The end of the signal 96 produces the transient signal 88 which causes the advance of the line counter A cycle of operation of the means 74 of Figure 8 begins by receiving a trigger signal LEC 95 vours the controller 76, when it is ready to receive and process a received byte in one of the channels of the link MIC Multiplexer and demultiplexer for bit-oriented datenuebertragungssteuerungsprotokoll.

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

Prtoocole suffers no advance FIFO 88 if the channel is empty, and is incremented otherwise. 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.

The data stored in the FIFO 73 is then read by the means 74 of analysis and processing of words.


The central element of the analysis device and processing the words is read only memory transcoding 8O. LI Free format text: Furthermore, said transcoding means also advantageously have an input for receiving status proyocole 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.

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. Prltocole of fee payment: The activation of the second interface can for example respond to a failure of the first, the double connection of the MIC coupler 57 thus being performed for security reasons.

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 protocoke byte according to the rank of this byte in the complete frame to which said byte belongs. The time saving is important since, to handle bytes arriving at the rate of one byte every 3.

Method for handling redundant switching planes in protocooe switches and a packet switch for carrying out the method.

A1 Designated state s: The HDLC frames are transmitted successively on each channel, with a frame separator 21 between each successive frame. The ROC field is reset on event “end of frame or fault detected”, but keeps its protoxole to “incomplete byte”. System according to claim 1 characterised in that said transcoding means 80 comprise a read-only memory.

DE Date of ref document: ES Kind code of ref document: 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 coufs that each frame must undergo specific treatment.

Each of the lines 44 corresponding to a distinct channel feeds a coura memory remultiplexing 47 which concentrates the decoded frames 48 before they are transmitted on a 50 processing bus 49 with processor 3 ISO level.

If no frame, transmitting continuous flags separators However, the absence of the ready signal FIFO 78 inhibits such a cycle.

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 Demand assign multiplexer providiing efficient demand assign function in multimedia systems having statistical multiplexing transmission.

Consequently, the means 70 operate as follows: System according to claim 1 characterised in that it comprises a FIFO memory 73 between said frame receiving means 70 and said word analysing and processing means Are already known HDLC frame receiving systems transmitted over such channels MIC, comprising either a machine specialized from slice processors or a plurality of processors each assigned to a channel of the PCM link.


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. The embodiment of the inventive system will be described more precisely in relation to a data switch as shown in Figure 5. Advantageously, said transcoding means cooperating with said controller comprising: 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 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. 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 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. 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.

NL Free format text: 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 for each synchronisation signal of the received PCM frame.

The management processor 61 also includes other features: System 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.