Abstract: Methods and apparatus are provided for designing IP networks with substantially improved performance as compared to existing IP networks such as, for example, those networks designed under best-effort criteria. Particularly, the invention includes methods and apparatus for: computing worst-case and optimistic link capacity requirements; optimizing network topology; and determining router placement within a network.

Abstract: A method for cell replication in which a request for data transmission and mapping information are received by a crossbar and a scheduler and are sent by one of a plurality of software configurable slot remap registers. The mapping information is indicative of a destination slot and a backup destination slot to which the data is to be transmitted. The method replicates the data by transmitting the data to the destination slot and to the backup destination slot when the data arrives at an input slot of the crossbar.

Abstract: A system is described where delay and bandwidth guarantees are implemented with a crossbar switch. A rate controller is provided as a front-end to a crossbar switch with an arbiter running a work-conserving arbitration algorithm. The system provides bandwidth and delay guarantees to all properly behaving flows independently of improperly behaving flows.

Abstract: A method and apparatus for transferring information in a communications system is described. In one embodiment, the method comprises creating a frame of information on a first line card and sending the frame over a backplane to a second line card using a serial link interconnect. The frame comprises first, second and third portions. The first portion includes information to process the second and third portions. The second portion has packet and time-division multiplexed (TDM) data in multiple channels. Each of the channels is allocable to packet data or TDM data. The third portion includes data placed into the frame to accommodate for differences in timing references between the line cards.

Abstract: A method according to the invention of reducing radio channel access delay in a packet radio system, and a packet radio system, which comprises a network element 100, 102 132, 140 and at least one subscriber terminal 150, which network element 100, 102, 132, 140 transmits channel allocation messages A1, A2, . . . to the subscriber terminals 150, which channel allocation messages A1, A2, . . . are transmitted by means of paging subchannels G0 . . . G9 . . . , and which subscriber terminals 150 listen to one or several paging subchannels G0 . . . G9 . . . . The invention is characterized in that the channel allocation messages A1, A2, . . . to be transmitted to the subscriber terminals 150 are organized such that the cumulative total delay of all the channel allocation messages A1, A2, . . . is minimized by optimizing the use of the paging subchannels G0 . . . G9 . . . .

Abstract: A Network Access Server incorporates a “hand-off” feature that allows the NAS to transfer an existing PPP connection from one NAS to another NAS. In particular, 3 new control messages are defined for use in the NAS. Namely: (i) Continued Call Request, (ii) Continued Call Reply, and (iii) Continued Call Connect. These 3 new control messages comprise a L2TP control message header, message identifier (e.g., continued call request, etc.), and a number of fields.

Abstract: Methods and apparatus are provided for designing IP networks with substantially improved performance as compared to existing IP networks such as, for example, those networks designed under best-effort criteria. Particularly, the invention includes methods and apparatus for: computing worst-case and optimistic link capacity requirements; optimizing network topology; and determining router placement within a network.

Abstract: This invention refers to a bandwidth optimizer, dynamically operating in connections relating to radio-communications for multi-bearer systems, especially useful for DECT systems for the short-distance transfer of data packets. Such an optimizer comprises: a first block to which bit error rate (BER) is fed and which calculates the most likely number (k) of retransmissions, which is required by the quality of air interface; a second block, which receives from the first one the most likely number (k) of retransmissions and provides, on the basis of such a number, a table giving the change in transmission time with the number of bearers; and a third block, which is fed by the second one and decides the optimal number of bearers to be allocated to the connection and the output of which feeds a device for resources allocation (RA), the optimal number of bearers representing the maximum band to allocate to the connection, depending also on the traffic intensity.

Abstract: The present invention reduces the number of multicast synchronization delays in a packet switch by determining the mix of packets pending at the input ports. When a sufficient number of multicast packets are ready for transferal, the packet switch preferably transmits a programmed number of multicast packets (or as many multicast packets that exist up to that programmed number). After transmitting these multicast packets, the packet switch resumes preferably transmitting unicast packets. Thus, the number of multicast synchronization delays is reduced over the prior art, the bandwidth utilization of the packet switch is correspondingly increased and the load due to multicast packets and unicast packet is balanced. One embodiment of the invention includes a timer that ensures that multicast packets are transmitted without undue delay.

Abstract: The invention reduces the circuit scale of a decoding apparatus for decoding input signals of multiple channels. A code string inputted to a code string resolver is resolved into signal components which are applied to signal component decoders for corresponding channels. The signal components decoded by the signal component decoders are applied to an adder and then added together. The added signal component is subjected to an inverse spectrum transform by an inverse spectrum transformer and then outputted.

Abstract: Tones that are generated by a telephone or PC (such as DTMF tones) and subject to loss or noise during generation or during transmission along a medium are detected and replaced with substantially noise-free and distortionless digital signals. In one embodiment, the replacement of the tones is done in a modem embodied in an Internet telephony Gateway/Terminal, such as in a network access server coupling a time division multiplexed telephone line to a packet-switched network. The replacement of the tones may also be performed in any suitable device that provides an interface between a time division multiplexed transmission medium and a packet switched data network, such as in the modems of a cellular telephone network to Internet network access server.

Abstract: Described herein is a hyperlink browsing system that includes a plurality of mobile hyperlink browsers that communicate wirelessly with a plurality of servers having geographically-dependent information content. The hyperlink browsers have access to positioning receivers that generate varying geographical coordinates indicating the varying locations of the hyperlink browsers; When submitting HTTP requests, the hyperlink browsers include the geographical coordinates. The servers recognize the parameters and customize returned content in accordance with the geographic locations of the requesting users.

Abstract: In an automatic telephone call transfer apparatus in an Internet connection mode, an initial value setting portion sets a telephone number of an exchange of a telephone office which will perform a call transfer, a telephone number of an ISP to be subject to the call transfer, and an automatic/manual mode. An automatic call transfer setting/canceling portion transmits data corresponding to the telephone number of an exchange of a telephone office set at the initial value setting portion, call transfer request data, and the telephone number of the ISP to be subject to the call transfer at the connection of an Internet service, and at the termination of the Internet service, transmits the number of the exchange of the telephone number set at the initial value setting portion and data for canceling the call transfer. A modem is connected to a communication line.

Abstract: There is disclosed an ATM communication apparatus including an SAR module for executing the processing of a low level layer in an ATM communication network, and a processing unit for executing the processing of a high level layer in the ATM communication network, for the purpose of realizing the function of converting an ATM cell which is a unit of information transmission in the ATM communication network, into an IP packet adapted to a communication protocol of a computer network, and the function of converting the IP packet to ATM cells. Segmentation and reassembly of the IP packet is executed in the SAR module. Thus, congestion of data between the SAR module and the processing unit can be reduced, so that the throughput from the input of the ATM cells to the output of the IP packet and from the input of the IP packet to the output of the ATM cells can be elevated.

Abstract: A multi-line telephony system and method deliver multiple concurrent telephone conversations to a customer premise via a single traditional twisted-pair communications connection, and support telephone services via a traditional dial-up connection. Improved packet-based communications are performed using the multi-line telephony system and method with better transmission characteristics, such as transmission speed, over traditional twisted-pair wire connections to provide H.

Abstract: A computer controlled communications switch for use at a communications center having an agent interface unit for conducting communication calls to and from an agent over both a telephone network and a computer network. The computer controlled communications switch comprises a switching unit having first and second states. When the switching unit is in the first state, the switching unit connects the agent interface unit to the telephone network, and when the switching unit is in the second state, the switch connects the agent interface unit to the computer network The switching unit is controlled by a computer including a predetermined program so that the switching unit is in the first state when a call is made to or from the agent interface unit via the telephone network, and the switching unit is in the second state when a call is made to or from the agent interface unit via the computer network.

Abstract: An adaptive DMT modem determines, as part of a startup sequence, subscriber loop conditions. One or more loop condition adaptation operations are then performed to reduce the complexity of the filters employed in the modem, to reduce the power dissipated in the modem, to optimize performance of the modem or to reduce the likelihood of EMI being radiated into the premises of a subscriber.

Abstract: A base station subsystem (BSS) and method is provided that handles an increase in traffic volume which temporarily overloads at least one terrestrial link in an IP network by gracefully downgrading the transmission rate of one or more calls. More specifically, the BSS includes a base station transmitter (BTS), an IP gateway and an IP network which passes at least one packet based call on a terrestrial link between the BTS and the IP gateway. The BTS and IP gateway each include an end-point having a buffer for measuring a delay in passing the at least one packet based call through the terrestrial link of the IP network and for downgrading a service when the delay as measured by one of the buffers exceeds a predetermined value.

Abstract: In accordance with the present invention a method is provided for encoding connection ownership information in the sequence number field of an outgoing TCP/IP data packet header. That connection information includes the network layer address of the processor node to which the packet is associated. With such an invention, the connection registration database is only updated after 32 megabytes have been transferred across that connection. Because fewer data packets are being registered in the connection registration database, sufficient time is allowed for registering other connections in background operations. Further, connections that do not send more than 32 megabytes of data never need to be registered.

Abstract: An optimized integrated high capacity digital satellite trunking network, otherwise known as the Multipurpose Wideband Communications System (MPWCS) and method to link multiple earth stations in the same or different satellite antenna transponder footprints using uplink frequency to select the downlink footprint. The configuration of the network eliminates the need to reconfigure the transponder based on the desired downlink footprint. The invention integrates wideband receivers and hybrid signal combiners on the satellite along with an appropriate uplink and downlink frequency plan to provide the ability to reconfigure connectivity between uplink and downlink footprints based on uplink frequency selection. Certain configurations allow single hop connectivity between all transponder antenna footprints for all users within those footprints of the geostationary satellite.