Abstract: A radio communication system having a base station and a plurality of radio terminals, wherein each radio terminal having a transmission request transmits a reservation packet at arbitrary timing through a reservation channel in accordance with a CDMA scheme, and the base station assigns a traffic channel and a time slot to be used to each radio terminal requesting a reservation through a reply packet outputted onto a reply channel. On the reservation channel, a short spreading code corresponding to a matched filter is applied.

Abstract: Narrowband subscriber terminals (40,52,58) of different narrowband networks are interconnected via a broadband network (48) that supports dissimilar signalling protocols to those maintained on the respective narrowband networks (40,52,58). A call server in a first narrowband network (40), in response to a call (100) from a first subscriber terminal (12) to a second subscriber terminal (68) in a second but different narrowband network (52), selects a phantom trunk (202) between the two networks. The phantom trunk has a unique circuit identity, which circuit identify is used in a first instance to relay to the second network an address of the second subscriber terminal (68). Then, in a second instance, the unique circuit identify is used to relay to the second network an address of the first subscriber terminal (68).

Abstract: A method of identifying direct sequence CDMA pulse shapes which optimize a cost function subject to various constraints. The cost function may either be an acquisition SNR or an interference power. The method may be applied to both full-response pulse shapes and partial-response pulse shapes. The constraints include a quasi-constant envelope constraint, a continuous phase constraint, a spectral nulls constraint, and an ISI-free constraint. The Fourier transform of a desired pulse shape is expressed in terms of a finite sum of prolate spheroidal wave functions. The cost function and the constraints are also expressed in terms of this finite sum. Numerical methods software determines the optimal solution. This may be used to produce finite impulse response filters which generate the desired pulse shape.

Abstract: Delay-sensitive information (e.g., voice, video) and non-delay-sensitive user data are combined and transmitted over a single UTP cable forming part of a star-connected Ethernet local area network. Master Ethernet packets of fixed length are formatted with fixed length portions assigned to the two types of information and transmitted at a constant fixed rate. The delay sensitive information is extracted, switched and transmitted at a constant bit rate. The non-delay sensitive information is segmented and transmitted asynchronously in a user data portion of the Master Ethernet Packet.

Abstract: A system and method for providing telephone type services over the internetwork commonly known as the Internet. Wireless digital telephones in communication with wireless digital communications systems have speech coders that generate digital voice samples, and encoders that encode the digital voice samples to minimize bit errors during RF transmission. The wireless digital communications system demodulates the received modulated wireless signal transmitted by the digital telephone to recover the encoded, digital voice samples. The error correction codes within the encoded, digital voice samples are removed to recover the original digital voice samples generated by the vocoder in the digital telephone.

Abstract: Telephone service is supplied using a distributed architecture that employs a collection of resources each of which exposes a hierarchical namespace. The architecture includes two fundamental resource types, the device server and the call coordinator, which are interconnected by a network employing a common protocol, e.g., TCP/IP. The interaction between the various resources follows “client-server” principles to implement end-to-end communication. Device servers represent physical/logical telephone devices, which include a) end-point device servers and b) gateway device servers. End-point device servers 1) represent controls for communication, such as keypads, indicator lamps, and displays, and 2) perform media rendering, e.g., voice digitization, transport, and reconstruction. Gateway device servers have two “sides”.

Abstract: An optical networking module is formed with an integrated module including optical, optical-electrical and protocol processing components, and complementary software. In one embodiment, the integral protocol processing component is a single ASIC and supports multiple protocols. The module is further equipped with support control electronics in support of control functions to manage the optical, optical-electrical as well as the multi-protocol processing component. The integrated module together with the complementary control software present to an optical networking equipment designer/developer a singular component that handles optical to electrical and electrical to optical conversion, as well as data link and physical sub-layer processing for a selected one of a plurality of datacom and telecom protocols, spanning local, regional as well as wide area networks.

Abstract: An internal network provides dynamically allocated bandwidths of up to 1.544 megabits/sec total over existing physical mediums such as twisted pairs. A line interface device connects to a local exchange carrier via a mux-demux unit that multiplexes communication signals for multiple channels of the internal network onto a single telephone line connection to the local exchange carrier. The line interface device allocates bandwidth amongst connected modem devices within the internal network according to device bandwidth needs. The modem devices are connected to each other and to the line interface device over the existing physical medium, for internal network transmission. Thus, high speed communications may be obtained without costly new physical medium installations. In this way, high connectivity may be obtained in a premises without large cost outlays.

Abstract: The invention provides a method and system for identifying header information in a packet header, and for switching (and otherwise operating) on the packet in response thereto. A first set of header information recognizers operate in parallel on selected words of the packet header so as to recognize a header format for the packet header and to determine header information in response to that header format. A second set of header information recognizers operates on the header information to select a set of words from the packet header which are used for lookup for treatment of the packet. The same or similar header information is located in the packet header responsive to information which determines an encapsulation type for the packet, such as packets which use the IP version 4, IP version 6, or IPX protocols.

Abstract: A base station for a multi-carrier TDMA radio communication system comprises a first management table for registering at least one candidate channel for single-channel communication selected from among multiple traffic channels each defined in terms of the carrier frequency and time slot number, a second management table for registering at least one group of candidate channels for multi-channel communication selected from among the multiple traffic channels, and a channel assigning unit which, in response to the reception of a channel assignment request from a mobile station, assigns at least one traffic channel to the requesting mobile station by making reference to one of the first and second management tables depending on the type of the mobile station.

Abstract: A private branch exchange comprises trunk circuits, communication highways connected to the trunk circuits for transmitting data of a time-divisional multiplexed channels, and a time switch for switching the communication highways. A communication highway is connected to a computer network via a circuit/packet converter. The computer network comprises branch networks to which the circuit/packet converter is connected, and a root network to which the branch networks are connected through a router/gateway. Each computer terminal has an extension number and IP/port addresses different for such communication functions as audio communication, data communication and the like. The circuit/packet converter has bearer circuits different for each communication function and allocates a specified bearer circuit to each time slot of the communication highway.

Abstract: The foregoing objects are achieved as is now described. A method for evaluating frequency plans for a CDMA based communication system having fixed base radio telephones is provided. The method begins by determining locations of a plurality of antennas. The plurality of antennas provide a coverage area for radio telephones. Then the method generates locations of radio telephones within the coverage area. Next, a distance from each radio telephone to the antennas is calculated. Then frequencies are allocated to the antennas. The resulting communication parameters between the radio telephones and the antennas are evaluated. Next, the coverage area which provides optimum power control to each radio telephone is determined. A frequency reuse factor is calculated to determine the efficiency of the allocated frequencies such that frequency allocation plans can be analyzed to determine efficient frequency planning.

Abstract: A scheduling apparatus includes a server for providing service to entities. The apparatus includes a mechanism for determining whether an entity that is to receive service at a future time from the server will be in conformance with a predetermined criteria at the future time when the entity is to receive service from the server. The apparatus includes a scheduler mechanism for scheduling when entities are to receive service from the server unless the determining mechanism determines the entity is not in conformance. A method for scheduling entities in an ATM network. The method includes the steps of receiving a session of an entity in a memory of an ATM switch connected to the ATM network. Then there is the step of scheduling the session for service by a server of the ATM switch. Next there is the step of determining with a determining mechanism whether the session will be conforming in terms of compliance to traffic contract of the ATM network in the future.

Abstract: The invention is a system for interfacing an ISDN or non-ISDN system with a broadband system. The broadband system can be an ATM system. The invention can process the ISDN signaling to select ATM connections and then interwork the ISDN connections with the selected ATM connections. The invention can interwork ISDN signaling and SS7 signaling. The invention can also process SS7 signaling to select ISDN connections and then interwork ATM connections with the selected ISDN connections. The invention can also interwork ISDN systems with non-ISDN systems.

Abstract: A system and method for synchronizing variable bit rate traffic between a source and destination in an Asynchronous Transfer Mode (ATM) network. The method includes designating a variable bit rate ATM Adaptation Layer (AAL) protocol to define ATM cell traffic flow from the source to the destination. A synchronous residual timestamp (SRTS) value indicative of the timing of a source clocking function is encoded and transmitted with an ATM cell using a variable bit rate AAL, such as AAL2 or AAL5. The ATM cells and associated SRTS values are received and decoded at the destination ATM interface, and the destination clock is synchronized with the source clock by modifying the destination clock according to the SRTS values.

Abstract: A connection-oriented communication interface management system which permits a connection-oriented multiplexed communications network to fully enjoy the advantages of ATM technologies, by giving more flexibility to a link management mechanism that associates connection-oriented communication interfaces with virtual channels. The system comprises a virtual channel set-up unit and an interface set-up unit. The virtual channel set-up unit establishes a virtual channel to reach a peer (remote) node. Separately from this channel, the interface set-up unit establishes a connection-oriented communication interface to communicate with the peer node. At the same time, the interface set-up unit defines association between the established connection-oriented communication interface and the virtual channel established by the virtual channel set-up unit.

Abstract: A communication control system and method comprising, in one embodiment, a master station connected to a slave station using two redundant buses, wherein command frames having the same content are sent out to the buses and the communication process is changed depending on whether or not the contents of the command frames, when received by the a receiving station, are identical. In another embodiment, a plurality of units are connected to each bus in a multi-drop configuration, and a line length of each bus is defined so that reflected signals from other units reach a receiving unit on each bus after the transition period of a received signal at that receiving unit ends. In still another embodiment, a unit is connected to each bus and the unit is provided with a driver IC, wherein transmission data is first encoded into bit signals having a fixed number of bits, then the signals are supplied to the driver IC.

Abstract: A personal computer having a convenient handset for transmitting and receiving a call. A handset (20) is connected to a personal computer (10) connected to a communication line. The personal computer (10) outputs audio data, received through the communication line, to the handset (20). The personal computer (10) includes an audio driver (12) to output audio data from the handset (20) to the communication line and a communication port driver (11) to transmit and receive audio data between it and the handset (20). The handset (20) is connected through an RS-232C cable (30) to the personal computer (10). The handset (20) transmits audio data to the personal computer only when a hookswitch (HS) is placed in the off-hook state. The audio driver (12) detects the condition of the hookswitch HS based on the existence of audio data from the handset (20).

Abstract: In an asynchronous transfer mode network (401), a network controller (404) is connected to terminal equipment units (406) through logic transmission line circuits (408) so as to receive a call signal which includes a parameter representative of a network class and which is produced by one of the terminal equipment units. Each of the terminal equipment units is connected to one of ATM exchangers (402) each of which is connected to at least one of them. The control network controller is connected to the ATM exchangers through logic transmission line circuits (405) so as to order them to admit a connection required by the call signal.

Abstract: A pilot signal detection method and a receiver, in which a search window having a predetermined time width is generated at every substantially constant time interval, and pilot signals existing in search window thus generated are detected. The position of the search window of each period is set in accordance with the delay amount between the timing (T_ref) of the first pilot signal and the timing (T_last) of the last pilot signal detected in the immediately preceding search window.