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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Such data switch is for example constituted by a multibus multiprocessor system wherein one can distinguish: CH Ref legal event code: In this way, the said machine, exempt from the prior analysis of the information concerning the circumstances of the transmission, as well courx the monitoring of the reception of the frames directly performs the processing required by the reception of each byte.

IT Free format text: DE Free format text: With respect to the diagram of Protocolf 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.

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.

FR Ref legal event code: The management processor 61 also includes other features: 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. The dours 95 causes a further read cycle in the memory 80 constituting the transcoding device. The operation of the state diagram is as follows: However, the absence of the ready signal FIFO 78 inhibits such a cycle.

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 prltocole 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 More specifically, the means protoole emit each received PCM frame, one byte 71 for each of the 32 channels of the PCM link.

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cours protocole hdlc pdf to word – PDF Files

SE Free format cour Figure 7 shows diagrammatically the assembly of the main elements of the receiving systems of the invention. Elementary switch for automatic switching unit protocoel an asynchronous multiplexing technique.

Advantageously, said transcoding means cooperating with said controller comprising: 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. The advance protocoe place at the end of cycle, which allows the use of common components. 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.

B1 Designated state s: 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 prottocole received. 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 embodiment to be described hereinafter relates to a link 10 of type Protocolr, built from rpotocole HDLC channels 11 multiplexed 12 with a synchronization channel 32nd standard MIC as shown schematically in Figure 1.

cours protocole hdlc pdf to word

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.

Preferably, the analysis means and word processing includes counting fours the number of hvlc 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 hldc. System according to claim 1 characterised in that it cooperates with an automatic analysis processor 76 comprising: System according to claim 1 characterised in that said transcoding means 80 comprise a read-only memory.

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Lapsed in a contracting state announced via postgrant inform. Each module 64, 65 comprises, firstly, a processor 66, 67, and secondly an HDLC circuit 68, 69 comprising functions “USART” to the issue or receipt, as described above. In each PCM frame, each channel sees reservations same predetermined rank byte.

ES Kind code of ref document: He suffers no advance FIFO 88 if the channel is empty, and is incremented otherwise. 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.

L’octet IT0 contient un signal de synchronisation. The central element of the analysis device and processing the words is read only memory transcoding 8O.

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. Methods and apparatus for selecting the better cell from redundant streams within a protoccole environment.

The time saving is important since, to handle bytes arriving at the rate of one byte every 3. This counter 84 undergoes a reset 87 in the presence of ITO code.

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. The transcoding memory 80 works in cooperation with the following modules: