Patent•
Network tap for use with multiple attached devices
13 Dec 2003-
TL;DR: In this article, the authors proposed a network tap for enabling attached devices such as an intrusion detection system to transmit information into a communication line of the network without disrupting the network traffic on the communication line.
Abstract: A network tap for enabling attached devices, such as an intrusion detection system, to transmit information into a communication line of the network without disrupting the network traffic on the communication line. When the attached device is an intrusion detection device, the network tap is connected to a firewall. An Ethernet switch or field programmable gate array (FPGA) is incorporated in the network tap to coordinate the transmission of device data to avoid data collisions with data transmissions already existing in the communication line. The network tap may be operated in various modes to accommodate different capabilities of attached devices. In addition, the network tap has various port configurations to allow a user to connect various attached devices through a single cable or dual cables and to connect various combinations of attached devices.
Citations
More filters
Patent•
25 Feb 2011
TL;DR: In this paper, an arrangement in a network tap for monitoring state of a monitoring system is provided, which includes a set of network ports that includes input and output network ports for outputting the data traffic from the network tap.
Abstract: An arrangement in a network tap for monitoring state of a monitoring system is provided. The arrangement includes a set of network ports that includes a set of input network ports for receiving data traffic and a set of output network ports for outputting the data traffic from the network tap. The arrangement also includes a monitoring port that is configured to receive the data traffic from the set of network ports and to forward the data traffic onward to the monitoring system. The arrangement further includes a logic component configured for executing a sequential heartbeat diagnostic test. The sequential heartbeat diagnostic test is configured for providing a first set of sequential heartbeat packets for testing and determining the state of the monitoring system. The arrangement yet also includes a logic component for activating one or more events when a failure condition exists for the state of the monitoring system.
15 citations
Patent•
11 Jul 2007TL;DR: In this article, passive full-duplex bidirectional zero-packet loss (ZPL) network taps that include single, dual, or dual differential couplers are placed in the communication path between two network devices.
Abstract: The principles of the present invention relate to passive full-duplex bidirectional Zero Packet Loss (ZPL) network taps that include single, dual, or dual differential couplers that are placed in the communication path between two network devices that communicate using a full-duplex bidirectional data stream that include a first and a second data component. The bidirectional couplers are configured to at least partially obtain a second data stream that includes at least the first data component and to obtain a third data stream that includes at least the second data component. In some embodiments, the bidirectional couplers may include a signal separation module or stage that is configured to further separate the first and second data components.
13 citations
Patent•
13 Nov 2006
TL;DR: A device server intended for attaching serial devices to a network includes Ethernet communications, an Ethernet switch, and serial communication capability so that multiple device servers are connected in a "daisy chain" or series pattern as discussed by the authors.
Abstract: A device server intended for attaching serial devices to a network includes Ethernet communications, an Ethernet switch, and serial communication capability so that multiple device servers are connected in a 'daisy chain' or series pattern. Galvanic isolation of the power supply from the housing and communication ports, screw terminal and modular connections, DIN rail mounting, broad power supply voltage ranges or 'Power-over- Ethernet' and operator visible indicator lamps with a pulse stretching feature greatly simplify installation and use.
13 citations
Patent•
05 Oct 2010
TL;DR: In this article, the authors describe methods, systems, computer-readable media, and devices for monitoring a stacked topology of network captured traffic distribution devices and/or a device or network connected thereto.
Abstract: Methods, systems, computer-readable media, and devices for monitoring a stacked topology of network captured traffic distribution devices and/or a device or network connected thereto are described. For example, a network captured traffic distribution device communicatively coupled to a plurality of network captured traffic distribution devices arranged in a stacked topology via a communication link may monitor a status of the stacked topology, a network captured traffic distribution device included in the stacked topology, a network communicatively coupled to the stacked topology, and/or a network device communicatively coupled to the stacked topology. Configuration information included in the network captured traffic distribution device may be updated responsively to the monitoring.
12 citations
Patent•
20 Sep 2012TL;DR: In this article, a test instrument includes a first processing system that is programmable to run one or more test programs to test a device interfaced to the test instrument, and the second processing system is dedicated to device testing.
Abstract: In general, a test instrument includes a first processing system that is programmable to run one or more test programs to test a device interfaced to the test instrument, and that is programmed to control operation of the test instrument, a second processing system that is dedicated to device testing, the second processing system being programmable to run one or more test programs to test the device, and programmable logic configured to act as an interface between the test instrument and the device, the programmable logic being configurable to perform one or more tests on the device The first processing system and the second processing system are programmable to access the device via the programmable logic
12 citations
References
More filters
Patent•
11 Mar 1991
TL;DR: In this article, a network switching system consisting of a first port coupled to a source, a second port coupled with a destination, and multiplexer means coupled to the first port and the second port for transferring data is described.
Abstract: A network switching system is described. The network switching system comprises a first port coupled to a source, a second port coupled to a destination, and multiplexer means coupled to the first port and the second port for transferring data between the first port and the second port by selectively connecting the first port with the second port. The data is transferred from the source to the destination through the first port, the multiplexer means, and the second port. The network switching system further includes processing means coupled to the multiplexer means for assisting transmission of the data by receiving the data from the first port when the first port does not indicate a port for the destination. A method of transferring data from a source to a destination via a network switching system is also described.
272 citations
Patent•
24 Feb 1997
TL;DR: In this paper, a bi-directional network medium monitor including a tap apparatus connected inserted in a network media, including a transceiver and a clock recovery element for each medium and medium monitor connection, is presented.
Abstract: A bi-directional network medium monitor including a tap apparatus connected inserted in a network media, e.g. Fiber Optic (FX) and Twisted Pair (TX), comprising a transceiver and a clock recovery element for each medium and medium monitor connection, and a bi-directional serial data multiplexer which directs the medium data while in the serial data format. Also, the medium monitor may interrupt medium data transfer in either medium direction and insert its data for diagnostic or other network purposes. Thus, the apparatus according to the present invention is operable to monitor a network at the maximum data rates currently used while providing no significantly network data delay.
246 citations
Patent•
25 Jul 1994TL;DR: In this paper, an ATM switch is used to combine blocks of data from multiple data servers into a single continuous data stream, which is especially well adapted for use in a video-on-demand environment.
Abstract: An ATM switch is used to combine blocks of data from multiple data servers into a single continuous data stream. The ATM switch is especially well adapted for use in a video-on-demand environment. Blocks of data may be striped across the data servers so that they are output from respective data servers in sequence. Transmission of data from the data servers to the ATM switch is scheduled so that the blocks of data are output in sequence without undue delay between the transmission of blocks of data from the servers. Synchronizing tokens are provided to the data servers to specify that they are to output data of a given sequence and to direct the sequence to a given virtual channel. As a result, the system of this invention appears to output single continuous data streams from the output ports of the ATM switch.
97 citations
Patent•
08 Mar 1995TL;DR: In this paper, a line interface is provided for performing a switching process of a fixed length cell consisting of data and a cell header, where individual units are individually connected to the plurality of lines accommodated therein and individually process the cells.
Abstract: Switching equipment in provided for performing a switching process of a fixed length cell consisting of data and a cell header. A line interface provided in the switching equipment accommodates a plurality of lines and, at the same time, processes the data from each line on a cell unit. The line interface includes individual units and a common unit. The individual units are individually connected to the plurality of lines accommodated therein and individually process the cells. The common unit is connected to the individual units and, at the same time, effects batch-processing of the cells processed by the individual units.
52 citations
Patent•
29 Jan 1997TL;DR: In this article, a method and apparatus for monitoring data sent between a source node and destination node in a switched network is presented, wherein the switches configure themselves to establish a connection path to a probe switch to receive the monitored data.
Abstract: A method and apparatus for monitoring data sent between a source node and destination node in a switched network, wherein the switches configure themselves to establish a connection path to a probe switch to receive the monitored data. The source and destination are identified along with the probe switch. An originating switch on a path between the source and destination is identified and connections between the originating switch and the probe switch are established. The originating switch sends out a first message and when the probe switch receives the first message, it returns a second message to the originating switch. Each switch between the originating switch and the probe switch that receives the first and second messages configures itself to establish the connection path.
50 citations