摘要:
In a system and method of setting a data communication through an Integrated Service Digital Network (ISDN) between a transmitting analog device connected to a transmitting Terminal Adapter interfacing the ISDN network, a receiving analog device is connected to a receiving Terminal Adapter interfacing the ISDN network in a data communication system wherein a plurality of transmitting analog devices are connected and transmit data to a plurality of receiving analog devices primarily through a data channel and without device identification therein.
摘要:
A method is disclosed for comparing a pattern sequence with a variable length key. A first bit of this sequence is identified by a pointer, the length and the location of the key are identified by a code word (W, S), the method includes a preliminary step of identifying the sequence and then performing a comparison with the variable length key.
摘要:
The invention relates to multilevel interrupt device (10) using a common microprocessor interrupt signal (101) to process interrupt signals (INT1, . . . , INTN) received from N peripheral chips. This device (10) is connected to a microprocessor (100) and N peripheral chips (200,210,230) through data/address busses (108,110) and it is also connected to a memory (150) by an additional bus (112). An interrupt operation starts when any one of the peripheral chips activates an interrupt signal through OR gate (220) detected by the microprocessor. The invention avoids to involve the microprocessor in the determination of the interrupt requester except for the generation of a common start.sub.-- address decoded by logic (180) for starting interrupt operations and a common end.sub.-- address decoded by logic (190) for ending it. Owing to the start.sub.-- address and the interrupt signals (173,174) received, latch (170) generates a translated address to memory (150) through a multiplexer (160) to start the corresponding interrupt routine stored at this translated address. The activation of any one of the peripheral chips leads to the reading of the corresponding interrupt routine stored in the memory without requiring any action of the microprocessor. The number of interrupt routines depends on the possible combinations of the N interrupt signals.
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:
The presently disclosed embodiments are directed to representing network performance information using a network map by partitioning a graphical affordance representing a network element in the network map into segmented sections in accordance with a temporal encoding scheme to encode temporal information in the network map. The segmented sections are encoded using a performance encoding scheme to identify a level of performance associated with the segmented sections so that the network map depicts a performance of the network element over time.
摘要:
Security system for preventing a personal computer (PC) including at least a location in the PC adapted to receive a PCMCIA card from being used by unauthorized people including an extractable card having a connection adapted to insert the extractable card into the location for receiving a PCMCIA card. Further included are a processor and a wireless transceiver for remotely transmitting alarm information relative to the PC. Still further included is a program stored in the memory of the PC for communicating with the processor in order to activate selected security functions.
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:
A node for a telecommunications network has a segmentation and reassembly module (SAR module) to perform segmentation and reassembly (SAR) on cells received by the node, the SAR module particularly providing Virtual Channel Identifier (VCI) and Virtual Path Identifier (VPI) translation (referred to as VCI/VPI translation), and has a direct memory access (DMA) mechanism for a storage external to the SAR module, the SAR module performing a first DMA access when the VCI/VPI translation are representative of an error code correcting (ECC) procedure to be carried out in the node, and the SAR module performing a second DMA access when the VCI/VPI translation corresponds to a message that does not require a local ECC procedure. A coder/decoder module performs an ECC procedure on the cells. A controller controls the coder/decoder module to perform an error correcting procedure in response to the detection of the first DMA access. The first DMA access uses a first address and the second DMA uses a second address. A Reed-Solomon coder-decoder or a Hamming coder-decoder may be used to perform the ECC procedure. An address decoder interprets the VCI/VPI identifiers to control whether or not an ECC procedure is done.
摘要:
System for transferring a data file from a web server to a user workstation through a network and reciprocally, the user workstation including a hard disk (205) for storing the data file being transferred over a SCSI bus (208). The user workstation includes a dual-port memory (304) for storing temporarily the data file, a network logic unit (302) interconnected between the network and the input port of the dual-port memory for receiving the data file from the network and transmitting it to the dual-port memory, and a SCSI logic unit (303) interconnected between the output port of the dual-port memory and the SCSI bus for transferring the data file from the dual-port memory to the hard disk over the SCSI bus and reciprocally.
摘要:
A method and a system for framing variable-length packets in a data communications system are disclosed. The successive variable-length packets carrying users' data, are formed in a stream of chained packets comprising a header. Two CRC's are computed. One over the data and another one over the header however, including also the data CRC of the immediate previous packet, thus chaining successive packets in a steam of such packets. The invention also assumes that encryption is performed independently over header and corresponding CRC's and, on the other hand, over the data of current packet. The invention allows to better adapt the transportation of multi-media users' data in packets of variable-lengths while securing transport by chaining successive packets, thus preventing that accidental or malicious deletion and insertion of packets occur and remain undetected. Also, the invention permits that intermediate transport nodes, owning keys to decrypt headers, may perform packet add/drop multiplexing without requiring that users' data need to be decrypted on their way to their final destination.