International Business Machines Corporation

Michel Bouillot

Jean-Marie L Munier

Jean L Calvignac

Jean-Louis J Calvignac

Jean M Munier

The system of the invention is used in a communication controller comprising a central control unit connected to at least one line adapter through a bus, wherein the line adapter may not be attached through its line interface to communication lines working at a speed higher than v, this mechanism allowing the adapter to be connected to one communication line onto which information is transported in frames at a high speed HS which is higher than v. It comprises a receive mechanism and a transmit mechanism building a bypass booster 1. The receive mechanism constructs from the received bit stream on high speed line 6, a short frame only comprising the heading portions of the frames, said short frame being handled by the line scanner 2 and the complete frame being handled separatly in bypass booster 1. The transmit mechanism simulates the transmission from the system bus 5 of a short frame which is handled by the line scanner and the complete frame is handled in the bypass booster, from which the complete frame is sent on the high speed line 6.

Bypass booster mechanisms for the line scanners of a communication

Mechanism for allowing data and packetized non coded information NCI such as packetized voice or images, to be exchanged between workstations connected to nodes of a communication network. The workstations arrange the bit stream to be sent into a format of regularly occurring time slots separated by flags. The data only containing time slots begin with a first flag (F2), the NCI only containing and NCI and data containing time slots begin with a second flag (F1) and inside these slots, flag F2 separates the NCI and data portions. The route between two workstations is established by a data session using the node resources. Once a route is established, the NCI portions of the bit stream are switched using high speed bus 26 and the data portions are routed using the normal data paths.

Non-coded information and companion data switching mechanism

Method for transporting asynchronous data and synchronous non coded information NCI bits on a common channel operating at (n+1)/T bits per second, in slot of duration T containing n+1 bits, the data and NCI portions of the bit stream to be transported being delimited by a flag having a specific pattern which cannot be simulated by the data bits. During the periods where there is an NCI activity, the first n bits of the slot are used for transporting NCI bits and the last bit is used for transporting an additional data bit, if the said first n bits are different from the flag pattern and said last bit is set to a first binary value (0) if said first n bits are similar to the flag pattern. During the periods where there is no NCI activity, data bits are sent in at least one slot delimited by two slots, the first n bits of which are set to the flag pattern and the last bit of which is set to the second binary value (1). A transmitting device and a corresponding receiving device are implemented for generating the bit stream built using the subject method on a communication channel and receiving the so-built bit stream.

Efficient transmission mechanism integrating data and non coded

Visualizable and descriptive data handling system including an assembly comprising a unit for reading a video disk on which images of schematic detailed layouts that can be displayed on a unit screen are recorded. A double entry table, T.sub.xy in memory correlates each of the image divisions of coordinates x.sub.i Y.sub.i with a memory location which itself contains the memory location address from which the descriptive data relative to the image element occupying the square, are stored. For every image, a table T.sub.REF of descriptive data is built through data input means, the memory address, where begin each of the descriptive data for a given image element, being recorded in table T.sub.xy at the address correlated with x.sub.i y.sub.j. When pointing a light pen on to the screen, the coordinates of the selected point are sent from a mini-computer which causes the descriptive data corresponding to the selected element, to be displayed upon look-up of the tables corresponding to the display image.

Visualizable and descriptive data handling system

Serial link adapter to be used in a communication controller comprising data handling means (DHM), said adapter allowing the communication controller to be attached to a multiplex serial link carrying data and non coded information bits in dedicated slots. In line adapter LA1 receiving means RCV1 are connected to serial link carrying data and non coded information slots. The receiving means comprises a routing arrangement for sending the data slot bits to the data handling means of the controller and the non coded information slot bits a high speed bus HSB1. Transmitting means Xmit1 are connected to high speed bus HSB2 and to the data handling means and comprises means for sending the data and non coded information slot bits in dedicated slots on the serial multiplex link MPX-T. Line adapter LA2 comprises means which are similar to the receiving and transmitting means in adapter LA1 and may be connected to the private branch exchange located in the same site as the communication controller.

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Nice, France

Michel Bouillot