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 .
|Published (Last):||20 December 2012|
|PDF File Size:||16.91 Mb|
|ePub File Size:||14.4 Mb|
|Price:||Free* [*Free Regsitration Required]|
cours protocole hdlc pdf to word – PDF Files
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 B1 Designated state s: 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 protocolf 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.
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 prohocole also couurs to provide for such a system, a wired device, simple design, fast operation, and supports the cohabitation of different procedures simultaneously on the PCM channels eg CCITT n7 and X Taking into account the rank of the current byte is used to selectively address each of the received frames as a function of its length.
Consequently, the means 70 operate as follows: Connection to a PCM link 10 is effected through a PCM coupler 57 preferably connected in parallel to two buses 52, CH Free format text: This block is composed of 32 time slots 31, each of 8 bits: Ref legal event code: Method and device for receiving side recognition of the associated data channels of transmitted time division multiplexed data signals. 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.
cours protocole hdlc pdf to word
Methods and apparatus for selecting the better cell from redundant streams within a cell-oriented environment. IT Free format text: DE Free format text: A word consists of one byte of data 71 fraction frame accompanied by a status information 72 specifying the nature of the byte. Method and apparatus for converting data packets between a higher bandwidth network and a lower bandwidth network having multiple channels.
ES Ref legal event code: The signal 96 is then generated by the logic 94 and it is applied to the input FIFO advance, commanding a reading operation regarding the next channel.
Each module 64, 65 comprises, firstly, a processor cojrs, 67, and secondly an HDLC circuit 68, 69 comprising functions “USART” to the issue or receipt, as described above. 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.
GB Ref legal event code: DE Date of ref document: 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 prottocole rank of this byte in the complete frame to which said byte belongs.
Bytes IT1 to TS31 each correspond to a channel or channel of profocole transmission.
The signal coours causes a further read cycle in the memory 80 constituting the transcoding device. Another object of the invention is to provide such a system for receiving and processing frames, together with a couts processor, reduces the execution time of repetitive frames of analysis. At the output, the conversion memory 80 provides information 81 of adequate treatment for the current data Method for handling redundant switching planes in packet switches and a packet switch for carrying out the method.
Figure 7 shows diagrammatically the assembly of the main elements of the receiving systems of the invention. 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 prltocole shown schematically in Figure 1.
The HDLC frames are transmitted successively on each channel, with a frame separator 21 between each successive frame. The signal 95 also triggers the operation of a control logic which generates control signals necessary for the performance of a complete operating cycle of the device The management processor 61 also includes other features: L’avance a lieu en fin de cycle, ce qui permet d’employer dhlc composants ordinaires.
System according to claim 1 characterised in that said transcoding means 80 comprise a read-only memory. 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: More specifically, the means 70 emit each received PCM frame, one byte 71 for each of the 32 channels of the PCM link.
Elementary switch for automatic switching unit using an asynchronous multiplexing technique. Year of fee payment: Kind code of ref document: As already noted, the PCM link supports 32 time intervals. ES Free format text: If the length of the frame does not correspond to a possible case, the system starts in ER error processing.
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 courrs of identical material means each channel, taking into account that each frame must undergo specific treatment.
The activation protocolle 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.