64 results about "Ethernet lan" patented technology

System and method are disclosed for bridging a point-to-point network such as a Bluetooth scatternet with a shared medium network such as an Ethernet LAN. The scatternet is connected to the LAN via a network access point (NAP). Data packets sent from the LAN to the scatternet are filtered at the NAP to eliminate unnecessary data packets from being sent to the scatternet. Only certain ones of the data packets are forwarded between the LAN and the scatternet. An inter-NAP protocol is used to exchange messages where two or more NAPs are connected to the LAN. Broadcast loops are prevented from occurring in the scatternet and the LAN by defining Administrative domains and NAP service areas (NAPSAs), and controlling the borders thereof according to a broadcast type of the data packets.

A user configurable, modular port expansion system allows the user of a host system such as a USB-enabled personal computer to customize a desired configuration of one or more peripheral device modules without the use of cables between modules. The peripheral device modules are physically and electrically connectable to each other side-by-side between a hub end module and a power end module in any sequence so that there can be provided, within the limits of the host port specification, virtually any number of selected, expanded functions in any combination. The peripheral device modules may include, by way of example, a standard parallel DB-25 port module, a two-port serial PS/2 module, a two-port serial DB-9 module, a four- or seven-port USB hub, an RJ-11 Ethernet LAN module, and an RJ-11 modem module. Where the host port is USB compliant, power to the peripheral device modules may be supplied by the host system via a USB standard cable connected to the USB port of the hub end module, or, if more power is required, by an external a.c. power adapter connectable to the power end module. The power end module may also include an USB expansion port.

System and method are disclosed for bridging a point-to-point network such as a Bluetooth scatternet with a shared medium network such as an Ethernet LAN. The scatternet is connected to the LAN via a network access point (NAP). Data packets sent from the LAN to the scatternet are filtered at the NAP to eliminate unnecessary data packets from being sent to the scatternet. Only certain ones of the data packets are forwarded between the LAN and the scatternet. An inter-NAP protocol is used to exchange messages where two or more NAPs are connected to the LAN. Broadcast loops are prevented from occurring in the scatternet and the LAN by defining Administrative domains and NAP service areas (NAPSAs), and controlling the borders thereof according to a broadcast type of the data packets.

LDPC (Low Density Parity Check) coded 128 DSQ (Double Square QAM) constellation modulation and its associated labeling. A novel means is introduced by which a constellation may be arranged and mapping in its symbols may be determined to provide for improved performance. One application area in which this may be employed is transmission over twisted pair (typically copper) cabling existent within data centers of various networks. The operation of the IEEE 802.3 Ethernet local area networks currently being used (as well as those currently under development) would benefit greatly by employing the various principles presented herein. When this novel approach of an LDPC coded 128 DSQ constellation modulation combined with TH (Tomlinson-Harashima) preceding is employed within a communication device at a transmitter end of a communication channel (i.e., in a transmitter and/or a transceiver), the overall operation of a communication system may improve significantly when compared to prior techniques.

System and method are disclosed for bridging a point-to-point network such as a Bluetooth scatternet with a shared medium network such as an Ethernet LAN. The scatternet is connected to the LAN via a network access point (NAP). Data packets sent from the LAN to the scatternet are filtered at the NAP to eliminate unnecessary data packets from being sent to the scatternet. Only certain ones of the data packets are forwarded between the LAN and the scatternet. An inter-NAP protocol is used to exchange messages where two or more NAPs are connected to the LAN. Broadcast loops are prevented from occurring in the scatternet and the LAN by defining Administrative domains and NAP service areas (NAPSAs), and controlling the borders thereof according to a broadcast type of the data packets.

An integrated communication system for voice and data connecting an Ethernet LAN to an external communication network by utilizing a conventional communication system. An interface connected to the Ethernet LAN and transferring a voice signal at a data link level without processors is stored in a personal computer. An ISDN voice interface for connecting the personal computer to the external communication network with a voice channel is connected to the LAN. The input/output data of the ISDN voice interface and various routers performing data communication on the LAN is multiplexed/demultiplexed in a plurality of channels by an ADSL multiplexer. The input/output data of the multiplexer is connected to the external communication network through an access network having a user interface.

System and method are disclosed for bridging a point-to-point network such as a Bluetooth scatternet with a shared medium network such as an Ethernet LAN. The scatternet is connected to the LAN via a network access point (NAP). Data packets sent from the LAN to the scatternet are filtered at the NAP to eliminate unnecessary data packets from being sent to the scatternet. Only certain ones of the data packets are forwarded between the LAN and the scatternet. An inter-NAP protocol is used to exchange messages where two or more NAPs are connected to the LAN. Broadcast loops are prevented from occurring in the scatternet and the LAN by defining Administrative domains and NAP service areas (NAPSAs), and controlling the borders thereof according to a broadcast type of the data packets.

The invention provides a method for precisely synchronizing a wireless sensor network under a coal mine, which relates to the field of the precise synchronization of wireless sensor networks and solves the problem that the precise synchronization of the wireless sensor network under the coal mine is very difficult to achieve. The synchronization method is implemented by the following steps that: A, a central station host computer sends configuration information to each cluster head node of the wireless sensor network; B, the cluster head node receives the configuration information sent by thecentral station host computer, then performs time synchronization of an ethernet LAN and sends a synchronization command to a mobile node in the wireless sensor network; and C, the mobile node performs synchronization with the cluster head node. The method adopts an IEEE1588 synchronous protocol to finish the nanosecond synchronization of the ethernet LAN, adopts a single-hop TPSN synchronized algorithm to avoid the synchronization error accumulation, and is suitable for solving the precise synchronization problems of the wireless sensor network under the coal mine, and is also used for solving the synchronization problems of the combination of all ethernet LANs and wireless sensor networks.

Aspects of a method and system for an asymmetric physical (PHY) layer in extended reach Ethernet local area networks (LANs) are provided. Reducing the communication rate provided by an asymmetric Ethernet multi-rate PHY may extend the standard distance over twisted-pair cabling where customer premises equipment (CPE) may be located in the MTU. Downstream and upstream rates may be aggregated evenly or unevenly over each twisted-pair wire in the copper cabling. The asymmetric Ethernet multi-rate PHY may support signal-processing operations, such as echo cancellation and/or equalization, which may be applied to the reduced communication rate to enable range extension. The reduced communication rate may be achieved by reducing the symbol rate provided by the asymmetric Ethernet multi-rate PHY. Reducing the communication rate may also enable utilizing cabling with greater insertion loss than those used for a standard connection distance.

A method and apparatus is disclosed for providing an integrated communication services (ICS) network that permits wireless and wireline data subscribers to share information on a hospital campus using wireless or wireline local area networks, or to seamlessly tap into the facility's central database while in transit away from the hospital. Users interface with the ICS network through the use of a point of care terminal that resembles a clipboard and accepts data entry from a stylus on an touch screen. The central database, referred to as the integrated communications clearinghouse (ICC) is adapted to store a communication profile for every network server on the ICS network. The ICC also maintains a Global Patient Profile (GPP), consisting of a patient profile for every patient ever added to the network. The GPP provides the ICC with the capability of providing aggregated data and demographic information (with or without patient identification), creating “live” public health statistics through a single query to a central server. To access the ICS, a user at a point of care terminal can utilize several paths in order to deliver data to its destination. This may include existing off-the-shelf PCMCIA based peripherals such as: wireless LANS, standard wired Ethernet LAN, a land line Modem, or wireless wide area networks. The wireless wide area networks may also include several data paths such as a circuit switched cellular, or packet based Cellular Digital Packet Data (CDPD). The actual selection of a particular channel will be service-dependent and a function of the user whereabouts, the desired quality of the connection, and the costs of the connection.

The invention provides an off-line simulation system for a secondary cooling of a slab continuous casting under a dynamic slight press, and mainly solves the technical problem that the adjustment of parameters under a dynamic slight press in an actual production costs too much. The computer in the simulation system consists of a simulator inner core unit, which is used for realizing an analog simulation of the main casting condition parameters; a processing model parameter setting unit which is used for setting the processing controls parameters in the model; a model calculating inner core unit, which is used for calculating the processing model combined with the simulated casting condition parameters; a monitoring and displaying unit, which is mainly used for accomplishing an UI display for the simulation result. The simulator inner core unit and the model calculating inner core unit realize an interaction of process parameter data through a shared memory. The model calculating inner core unit and the monitoring and displaying unit conduct an interaction of simulation result data through an Ethernet LAN. The model calculating inner core unit and the processing model parameter setting unit realize an interaction of processing model parameters through a database of model parameters. The invention is mainly applicable to an analog simulation of the specific control process of the water distribution for a secondary cooling of a slab continuous casting under a dynamic slight press.

Multi cast techniques are employed to provide host computer elements access to multiple redundant servers of a communication network in such a way that the hosts need not know which of the servers is active. In one embodiment, the servers provide a gateway function between an Ethernet LAN and an external network. The Ethernet LAN comprises one or more hosts connected to one or more switches, the switches connected to corresponding servers defining an active/standby pair. The servers are connected to an external network by corresponding active/standby links. The hosts send messages directed to a multicast address to at least one of the switches. The switches forward the messages on ports according to a multicast routing topology having been determined by performing IGMP “snooping” of messages issued from the servers. Both the active and standby servers receive the messages; and the active server sends the messages to the external network. In case the active server fails or is removed from service, the standby server is promoted to active server and assumes the role of the formerly active server without necessitating any communication to the hosts to inform them of the change in status of the active server.

A method of controlling the flow of data packet traffic from a first point to at least two second point in an Ethernet telecommunications network having a multiplicity of nodes interconnected by multiple network links, comprises monitoring the level of utilization of a link between the first and second points, generating flow control messages representing the level of utilization and transmitting the control messages to the first point, and using the states represented in the flow control messages as factors in controlling the rate at which the packets are transmitted from the first point to the second point. A method of controlling the flow of data packet traffic through an Ethernet telecommunications network having a multiplicity of nodes interconnected by multiple network links, comprises receiving incoming data packet traffic from multiple customer connections at a first node for entry into the network via the first node, the first node having an ingress trunk, and limiting the rate at which the incoming data packets are admitted to the network via the ingress trunk.

A differential time domain digital communication bridge module interfaces 100 Mbps Ethernet traffic with a T3 communication link, using a relatively small sized data buffer. To avoid dropping packets, the relatively large sized buffer in the Ethernet switch is used to temporarily store packets, in when an upper threshold of the storage capacity of the buffer is reached. The upper threshold leaves enough storage overhead in the buffer to allow the Ethernet switch to complete its current transmission of a maximum length packet. When a lower threshold is reached a ‘resume transmission’ packet is sent to the switch. The lower threshold provides sufficient buffer space to allow the T3 transmitter to read out the contents of the buffer without underflow.

Methods and apparatus for implementation of fault-tolerant networks provide a network fault-tolerance manager for detecting failures and manipulating a node to communicate with an active channel. Failure detection incorporates one or more methods, including message pair and link pulse detection. Failure recovery includes switching all node data communications to a stand-by channel or switching just those nodes detecting a failure. Communication between nodes provides the distributed detection, with detecting nodes reporting failures to their network fault-tolerance manager and the network fault-tolerance manager broadcasting the failure recovery to all nodes. The network fault-tolerance manager is middleware, residing with each node in a logical hierarchy above a physical layer of a network and below a transport layer of the network. The approach is particularly suited to Ethernet LANs and capable of using commercial off-the-shelf network components.

A network communications system is provided for allowing a group of computer users in a conference room or similar small work environment to access an Ethernet local area network (LAN) and to provide peer-to-peer group networking without connection to a backbone network. The system includes multiple (for example, 4 or 8) client computer ports each including a removable spring loaded cable dispenser carrying an extendible/retractable Category 5 LAN cable terminated with an RJ-45 plug for connection to a client computer's network adapter. Combined power/Ethernet LAN cables connect the system to an enterprise network and to a source of electrical power, and permit cascading of up to three 8-port systems. In use, a computer user pulls out the cable from one of the client ports and inserts the RJ-45 plug into the RJ-45 jack on the network adapter carried by the computer. After completion of the networking session, the user unplugs the cable which is automatically retracted by the spring loaded cable reel. A cable management system is thereby provided which eliminates the tangle or clutter of multiple cables encountered in existing systems.

There is disclosed a method and apparatus for facilitating a network, such as an Ethernet LAN, for efficient forwarding of data traffic by collecting neighbor information, generating and distributing link state advertisements, populating a topology database for the network, and calculating trees for each bridge serving as a root bridge. In a preferred embodiment the method and system also prepare one or more backup topologies, and store them for use if they are needed due to a failure condition detected in the network. In a particularly preferred embodiment, probabilities are assigned to various potential failure conditions, and the probability values are used to decide which backup topologies to calculate, store, or use.

The invention relates to a device and a method, which reduce the outlay required when searching for a suitable network configuration, in particular in the field of automation. The device for the automatic planning of a network configuration, in particular for an automation system, comprises at least one partition module to break down at least one described network planning problem into sub-problems, at least one production module to generate at least one solution to each of the sub-problems of the at least one network planning problem based on predefinable rules and at least one validation module to verify the generated solutions to the sub-problems. The purpose of the device and the method according to the invention for automatic network planning is to support the planning process for network structures for major systems, in particular for systems with more than 1000 users, by supplying suitable methods and tools. One of the focal areas is switch-based Ethernet-LANs, as used for example in PROFInet environments.