Abstract: This method applies to the transmission of information during a communication session, on a network having at least one switch, over at least one path between a so-called “source” node and a so-called “destination” node. The network is adapted to transmit data according to at least one connected mode and at least one non-connected mode. The session includes the transmission of at least one packet including on the one hand “user” data and on the other hand additional data defining notably the path on the said network which the said user data will follow. Each time a packet is received, the destination node performs: an operation of reading the said additional data (601), and an operation of determining the transmission mode (602), connected or non-connected, taking into account at least some of the said additional data.

Abstract: A PPP termination device allowing PPP termination at a location where a decreased number of subscriber's signals are multiplexed is disclosed. The PPP termination is performed in an access gateway including a switch in the access network system. The access gateway includes a first interface to a DSLAM, a second interface to a backbone network, and a header processor for converting between a network-layer packet and a PPP data packet including the network-layer packet. The switch switches a connection among the first interface, the second interface, the PPP link controller, and the header processor, depending on which one of a PPP data packet and a link control packet is inputted. The link control packet is used for link establishment and disconnection.

Abstract: A method for data transmission via a packet-oriented communications network, wherein, communications terminal devices are connected to the packet-oriented communications network via at least one transfer unit and a switching system. To transmit data between the switching system and the communications terminal devices, a time-slot-oriented data format is provided, which is formed from a periodic sequence of channel-specific information segments. For the transmission of data via the communications network, a user data area of a data packet used to transmit data via the communications network is subdivided into at least one first subpacket and into a second subpacket, data of a channel-specific information segment being transmitted in each case in the first subpackets.

Abstract: The present invention provides a unitary mechanism for high speed end-to-end telecommunication traffic using an Asynchronous Transfer Mode (ATM) architecture for convergence of video, data and voice in an SOHO application using a DSL router. An ATM module (101) for convergence of the telecommunications traffic includes an ATM processor (120) configured to perform QoS, OAM processing and switching in an ATM system. Function modules (102,104,105) and data ports (106,108) are configurable to transceive data, voice and video traffic in which the traffic is packetized in ATM data cells.

Abstract: The present invention relates to an AAL-2/AAL-5 processing apparatus which is capable of simultaneously processing AAL-2 and AAL-5 cells transmitted through multiple virtual channels between a base station (BTS) and a base station controller(BSC).

Abstract: An architecture for use in controlling and managing optical functions and optical devices. A common microprocessor based control layer coordinates commands between optical devices and a user station. The control layer executes an operating system which handles data flow in the control layer. Generic commands from the user station causes the operating system to call specific subroutines the produce digital commands. These digital commands are then passed to a digital layer that interfaces with an analog layer. The analog layer is specifically developed to interface and work with a specific optical device. The analog layer thus directly controls the optical device including changing its settings based on input from the digital layer.

Abstract: An ATM (Asynchronous Transfer Mode) bridge device is provided which is capable of removing unwanted ATM network traffic transmitted by a loop packet, of avoiding confusion of a layer 2 network caused by occurrence of erroneous learning, of rapidly identifying a point where a loop has been formed, and of preventing simultaneous formation of loops among a plurality of points caused by loop setting in a plurality of interfaces. The ATM bridge device has functions of learning a MAC (Media Access Control) address of a packet transmitted from the ATM bridge device, of filtering and monitoring a MAC address of a packet input from an ATM network and judges, when receiving a packet output from the ATM bridge device, the input packet as a loop-back packet to scrap the packet and to notify an upper network layer of the loop-back packet.

Abstract: A connectionless oriented communications network is disclosed having a plurality of IP network routers R1-R3 controllable by a service controller S the service controller S being arranged to set a service across the network by configuration of at least some of the routers R1-R3, configuration instructions to determine packet forwarding behaviour sent from the service controller S to the routers R1-R3 being in a common form and each router R1-R3 having associated therewith a translation program for translating the common form instructions into configuration information specific to that router.

Abstract: The invention concerns a method of managing data packets originating from data frames, the packets being presented to buffer (40) prior to processing. When a packet corresponding to the start of a frame is presented to the buffer stage, it is determined whether the filling level of the buffer (40) exceeds a first predetermined filling threshold (42) corresponding to a state of congestion and, if such is the case, this packet and all packets belonging to that same frame are systematically discarded before the buffer. The frames can e.g. originate from AAL2 connections, and each constitute a respective ATMS adaptation layer service data unit (AAL2 SDU), in which case the packets are common part sublayer (CPS) packets, and the buffer (40) stores the CPS packets before the latter are multiplexed into asynchronous transfer mode (ATM) cells. The invention also relates to an apparatus for implementing the above method.

Abstract: Method and device provide for the encapsulation of control information in a real-time data stream. In one embodiment a method of encapsulating data in an information frame is provided. This information frame has a payload portion and a trailer portion wherein the trailer portion is designated for control data and the payload portion is designated for real-time data. In use control data is inserted into the payload portion of the information frame and an extension bit is used to signify the presence of control data in the payload portion of the information frame. The information frame is then transmited over a virtual circuit.

Abstract: A device with quality controllable SAR function according to upper layer instruction enables reassembly and segmentation SAR of AAL5 to which priority in upper layer is reflected to be provided in reassembly and segmentation of AAL5 in ATM layer processing.

Abstract: A method for transferring a series of layer-3 packets through an ATM network composed of a plurality of ATM switches is disclosed. An ingress gateway determines whether a packet flow has been registered and, when the flow has not been registered, determines a transfer route. A connection setup cell is transmitted to a next-hop ATM switch to ensure a connection dedicated to transfer of tho series of packets. Then, a series of packets is transferred to the next-hop ATM switch through the connection after the connection has been set up.

Abstract: In a system where a plurality of terminal units are connected to a network unit via an optical transmission line and packets are transmitted in units of cells according to polling information, polling request information including the number of variable-length packets stored in the buffer of each of the terminal unit, the number of cells composing each variable-length packet and the number of remaining cells of a packet being read is created, polling information corresponding to a time slot allocated according to the polling request information is transmitted from the shared band control unit of the network unit, and bands are allocated to the plurality of terminal units.

Abstract: Traffic on a connectionless (CL) network, such as IP packets, can be routed onto a connection a connection oriented (CO) network, such as an ATM telephony network, when it is advantageous to do so from a user or service provider viewpoint, without affecting the ability of users to continue to use existing applications. Routing is controlled by nodes called CL-CO gateways, with connectivity to both the CL network and the Co network. When CL traffic originating at a source reached these gateway nodes, a decision is made whether to continue carrying the information in the CL mode, or to redirect the traffic to a CO network.

Abstract: The two-way transmissions are performed between a first bus and a usual portal of a first full-duplex 3-portal bridge and between a second bus and a usual portal of a second full-duplex 3-portal bridge, respectively. The one-way transmission of an isochronous packet and an asynchronous stream packet is performed between transmission and reception portals of the first full-duplex 3-portal bridge and reception and transmission portals of the second full-duplex 3-portal bridge. The first full-duplex 3-portal bridge and the second full-duplex 3-portal bridge perform a conversion between the asynchronous stream packet and an asynchronous packet if necessary.

Abstract: A connectionless communications network includes a number of low earth orbit (LEO) satellite nodes. Motion of the satellites constantly changes the topology of the network. A virtual model of the network having fixed virtual nodes, is maintained in a connection control system. This virtual model is used to control the route that traffic will take through the real network. As topology changes happen in the network then the virtual nodes of the model become embodied by different real nodes and communicate their virtual identity to connected nodes. Routing of the traffic is performed with reference to the virtual network so that routing follows the current embodiment of the virtual network.

Abstract: An information delivery system includes receiving platforms to receive data communicated from a transmitting source according to a unidirectional transfer protocol over a link. At least some receiving platforms process the received data to determine if a portion of expected data is missing. If so, a receiving platform is able to generate and send a request for the missing data according to a supplemental protocol that is separate from the unidirectional transfer protocol. The transmitting source is able to receive the request for missing data and to retransmit the missing data. The data may include ancillary information (e.g., enhancement data) associated with audio/video content (e.g., television content). By adding the supplemental protocol to enable requests for missing data, a unidirectional transfer protocol that is not reliable is made reliable as a mechanism is provided to ensure receipt of the transmitted data.

Abstract: A non-geostationary satellite connection-less network incorporates a plurality of satellite nodes and ground stations in communication with the nodes. The network is modeled by the corresponding virtual model network. In the virtual network, connections between users are available between virtual nodes and are made according to a restricted set of routing plans based on the modeled virtual paths between those nodes. The virtual model provides a means of determining admission of connection-orientated calls of different quality of service (QoS) traffic class requirements into the network with engineered grade of service (GoS) and QoS guarantees.

Abstract: An asynchronous transfer mode (ATM) system having an interleaver of 8 bit parallel cell units includes n ATM cell header buffer for storing an ATM cell header into a cell header buffer or outputting data by 1 bit at a buffer according to a control signal output from a write controller or a read controller, a write controller to separate and store a cell header and a payload, read controller to sequentially the mixed output data from the interleaver memory, an interleaver memory for using payload data of ATM cells . . . , and a multiplexor for multiplexing 12 byte data output from the interleaver memory, wherein a 8 bit interleaver is directly added to the conventional ATM processing method since all ATM cells are to be processed by 8 bit parallel unit, and all interleaving process may be performed in parallel without any serial/parallel converting circuit, thereby achieving a device which is proper for low speed wireless environment.

Abstract: An internet protocol (IP) layer processor has an IP header processing section for checking a defect in an IP header of a first ATM cell of an AAL5 frame, and a SAR (segregation and reassemblage) section for transferring the AAL5 frame in the form of separate ATM cells if the check by the IP header processing section indicates a normal IP header, without using a CPU. SAR notifies a defect in the IP header to CPU without transmission of the AAL5 frame if the check indicates the defect in the IP header. The IP layer processor achieves a higher processing due to the direct transfer by the SAR without using processing by a software.

Abstract: An asynchronous transfer mode (ATM) digital electronic communication system includes an ATM communication system interconnection and termination unit (ATMCSI/TU). This ATMCSI/TU includes both a programmable microprocessor and several hardware-implemented coprocessors. The hardware-implemented coprocessors are under control of the microprocessor, and are dedicated to the performing of repetitive tasks. Thus, the microprocessor is freed to perform supervisory tasks in the ATM in addition to performing tasks associated with actual communication of digital data packages (i.e., CS-PDU's) in the ATM system. Thus, the APU is freed from doing respective data manipulation tasks, while these tasks are performed by one or more hardware-implemented coprocessors using memory mapped data structures and linked lists of data.

Abstract: A coding device encodes image data with the coding self-contained within specific image data units, and supplies the encoded data stream to a packetizer to generate packets from the encoded image data stream, and a packet header adding device adds to each packet a packet header containing time information whereby the temporal position of the packet is determined. Thus, temporal information associated with data received after recovery of an error can be known immediately by the receiver even when an error occurs on the communications network over which a data stream containing image data, audio data, and other information is transmitted.

Abstract: In an AAL5 jitter reduction method for an image data transmission system for converting MPEG data into ATM cells and transmitting the ATM cells through an ATM line, an addition average value of system time clocks at timings for detecting starts of adjacent transport packets after AAL5 termination is obtained. A transport packet arrival time is corrected on the basis of the obtained addition average value. An AAL5 jitter reduction apparatus is also disclosed.