摘要:
The invention provides an impedance adapter that automaticaly switches to impedances that match network transmit/receive lines impedances (105,106) by a controlled switching of various impedances mounted serially/parallely with connected transmitter/receiver (100,101). For a high speed adapter, a balanced transmitter/receiver is required for limiting crosstalk effect due to the high transmission rate. Transmit/Receive impedance adaptation networks (102-103) are composed of serial/parallel networks of resistors and relay contacts that are switched independently by magnetic coils of an impedance switching circuit (110) and having values conformable to the various network impedances imposed by different national regulations. By using the principle of double deviation voltage technique, a measuring circuit (108) detects upward and downward voltages (VA,VB), VB amplified by 2 to generate an analog signal VS (VS=VA-2VB) to a control logic circuit (109). This circuit (109) determines if the resistors value selected by the magnetic coils of said impedance switching circuit (110) is equal or not equal to the impedance of the network lines (106,105). Thus, it compares VS to a voltage Vref (25) to generate an output which selects and activates the correct magnetic coil for changing or keeping equal the resistors of the receive/transmit impedance network (102,103) currently connected to the network lines (105,106).
摘要:
A hardware device for processing the tasks of an algorithm of the type having a number of processes the execution of some of which depend on binary decisions has a plurality of task units (10, 12, 14), each of which are associated with a task defined as being either one process or one decision or one process together with a following decision. A task interconnection logic block (16) is connected to each task unit for communicating actions from a source task unit to a destination task unit. Each task unit includes a processor (18) for processing the steps of the associated task when a received action requests such a processing. A status manager (20) handles actions coming from other task units and builds actions to be sent to other task units.
摘要:
The invention relates to a Universal Serial Bus (USB) with two wireless communication hubs (USB hubs). One of these hubs is connected to a first host computer, and both USB hubs are connected to a plurality of I/O devices. Each USB hub includes a wireless adapter and an antenna connected to the wireless adapter. The wireless adapter of each USB hub comprises a transmitting/receiving unit for transmitting data via the antenna to the wireless adapter of the other USB hub or receiving data via the antenna from the wireless adapter of the other USB hub. The wireless adapter also comprises a wireless dual port, which is automatically configured upstream or downstream when the first host computer is connected to one of the USB hubs.
摘要:
Hardware device for parallel processing a determined instruction of a set of instructions having a same format defining operand fields and other data fields, the execution of this determined instruction being represented as an algorithm comprising a plurality of processes, the processing of which depending on decisions. Such a device comprises means (22-30) for activating the processing of one or several processes (32-38) determined by the operand fields of the instruction, decision macroblocks (12-20) each being associated with a specific instruction of the set of instructions, only one decision marcoblock being selected by the determined instruction in order to determine which are the process(es) to be activated for executing the determined instruction.
摘要:
A telecommunication node for an Asynchronous Transfer Mode (ATM) telecommunication network performs Segmentation and Reassembly (SAR) of ATM cells. The SAR particularly provides Virtual Channel Identifier (VCI) and Virtual Path Identifier (VPI) translation and further provides a Direct Memory Access (DMA) for accessing an external storage. When the VCI and VPI identifiers are representative of an Error Code Correcting (ECC) procedure to be carried out in the local mode, the SAR circuit performs a first DMA access which is decoded by an address decoder. Conversely, when no ECC procedure is locally required, the SAR decodes the VCI and VPI and performs a second DMA access which is also decoded by the address decoder. The latter decoding is then used by a Reed-Solomon Coder and Decoder for possibly performing an error correcting procedure on the ATM message formed by the ATM cells being processed.
摘要:
Method of reinitializing dictionaries in a data transmission system using data compression having a transmit device and a receive device, and in which strings of characters have to be transmitted in a compressed form, the transmit device having a transmit dictionary storing codewords associated with the strings of characters which are transmitted instead of the strings of characters, the receive device having a receive dictionary storing codewords associated with the strings of characters, and both dictionaries being updated each time a new string of characters has to be transmitted so that the contents of the dictionaries remain identical. This method saves at least the addresses of the parts of the transmit or receive dictionary which have to be modified by a dictionary updating operation, builds a check message based upon the contents of the transmit dictionary updated by the dictionary updating operation, transmits the check message from the transmit device to the receive device, and then deletes in both dictionaries the parts which are determined by the saved addresses in the event that the check message does not correspond to the contents of the updated receive dictionary. This enables both dictionaries to be reinitialized in an intermediate state without being reset.
摘要:
An apparatus and a method to synchronize the clock signal of a first (or slave) data terminal equipment A (240-1) to a second (or master) data terminal equipment B (240-2) connected to a communication network (10) through respectively a first network node (51) and a second network node (52). The communication network has a reference clock that it transmits to the second network node which compares it with the clock signal that it receives from the second data terminal equipment. The phase difference is then detected and converted into a frame which may be an ATM cell or any other frames so that it can be switched with the data frames sent by the second DTE and transmitted to the first DTE through the communication network. The frame containing the phase difference has a specific header so that it can be distinguished from the other transmitted data frames. The first network node receives the frames, detects the phase difference frame and decodes it before it is sent to a digital to analog converter. This later generates then an analog signal which adjusts the phase of the reference clock that the first network node has extracted from the communication network. The adjusted clock signal is transmitted to the first DTE which is therefore synchronized with the second (or master) DTE.
摘要:
A hardware device for processing the tasks of an algorithm of the type having a number of processes the execution of some of which depend on binary decisions has a plurality of task units (10, 12, 14), each of which are associated with a task defined as being either one process or one decision or one process together with a following decision. A task interconnection logic block (16) is connected to each task unit for communicating actions from a source task unit to a destination task unit. Each task unit includes a processor (18) for processing the steps of the associated task when a received action requests such a processing. A status manager (20) handles actions coming from other task units and builds actions to be sent to other task units
摘要:
In a remote computer, a method for providing a file comprises the steps of receiving a request for this file, identifying this file as being stored in a distant server, requesting the distance server to send the file, identifying this file as being used, and forwarding this file. Further, in a local server, a method for transferring a file from a home server comprises the steps of receiving a request for this file, this request comprising the home server identification, checking that this file is not locally stored, requesting this file to the home server, identifying the file as being locally used, and forwarding this file.
摘要:
According to the invention, a device for transferring data between two workstations connected to a network is provided. This device comprises means for distributing data among a plurality of links of the network. Preferentially, the device comprises a dual-port memory for storing the data. In a preferred embodiment, the device further comprises a high speed interface for transmitting data from a workstation to the memory, associated with each link, a low speed interface for transmitting a part of the data from the memory to this link, and a controller for monitoring the data flow between the workstation and the plurality of links, by controlling the memory and the interfaces.