Abstract: The invention relates to a method of changing the size of mini cells belonging to an individual connection during an ongoing connection. A control mini cell is used for this purpose. The control mini cell is transported either in a separate connection or in the same individual connection the mini cell size of which it shall change. Depending on system design the control mini cell is handled either at the control plane by the operation and maintenance system of the telecommunication network or is it handled at the traffic plane by transmission equipments.

Abstract: In a communication system a multimedia signal is encoded in an encoder (1) and subsequently transmitted over a packet switched network (4) to a terminal (6). The terminal (6) comprises a receiver (8) whose output is connected to a receive buffer (210). The output of the receive buffer (210) is applied to the presentation means (214) which comprises a decoder (216) and a presentation device (218).

Abstract: A computationally-efficient traffic shaper replaces per-virtual-circuit shaping queues that all must be processed during each cell-emission period, with a sequence (130) of shaping queues (131) shared by a plurality of virtual circuits and only one of which must be processed during each cell-emission period. N shaping queues are used, where N is the maximum cell delay effected by the traffic shaper divided by the cell emission period; for constant-bit-rate narrowband virtual circuits, N is 47. Each virtual circuit is assigned one or more of the shaping queues, spaced evenly in the sequence, as its serving queues, proportionally to its size. A dequeue state machine (141) cyclically transmits the contents of a current one of the shaping queues during each period. Per-virtual-circuit instances of an enqueue state machine (140) each enqueue received ATM cells of its corresponding virtual circuit.

Abstract: A method and system for improving the passage of silent or unused status of Ds0 channel to a data switch with a Ds0 switching capacity. The method allows the Ds0 channel source to be the only equipment that must engage a digital signal processor to remove silent and unused Ds0 channels from a Ds0 channel carrying data packet. The method provides for the Ds0 channel source, the intermediate nodes (data switches with Ds0 switching matrixes included) and Ds0 channel destination to recognize a simple and efficient means of passing suppression status of a Ds0 channel through the entire network.

Abstract: An ATM edge switch incorporating wireless and wireline voice and data functions is utilized to provide an integrating point for wireless and wireline communications. Functions included in the ATM edge switch are: a voice services function for voice processing functions, element management function for real time management of resources required for call processing, a call processing function for supporting calls, a mobility manager function providing access to Home Location Register/Visitor Location Register (HLR/VLR) and a network access function to consolidate traffic to and from access devices and to interface the access devices to an ATM communications network fabric.

Abstract: A system and method for effectively implementing isochronous processor cache comprises a memory device for storing high-priority isochronous information, an isochronous cache coupled to the memory device for locally caching the isochronous information from the memory device, and a processor device for accessing and utilizing the isochronous information that is stored in the isochronous cache. The isochronous cache is reserved for storing the isochronous information, and may be reconfigured into a selectable number of cache channels of varying size that each corresponds to an associated isochronous process.

Abstract: A local area network of devices connected to a Communication Switching Module (CSM) carry both delay-sensitive information and non-delay sensitive user data in master Ethernet packets transmitted over the LAN at a constant rate. Signaling and control information from the devices initialize a permanent virtual connection (PVC) between devices and the CSM. The signaling and control information is contained in standard Ethernet packets which are encapsulated along with non-delay sensitive data in the master Ethernet packets and performs various control functions for the LAN devices and the CSM.

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: Adaptive clock recovery for the receiving entity of a communication system transporting constant bit-rate (CBR) services over an asynchronous transfer mode (ATM) or ATM-like network is performed by a digital phase locked loop (DPLL). The recovered clock is based on the DPLL's phase detector's count of high frequency service clock cycles between transitions in an input signal representative of instances of receipt of ATM cells subject to cell delay variations through the network, and a reference clock signal whose frequency is a prescribed fraction of that of the output clock. The DPLL's VCO function is an increment/decrement of the service clock frequency, which avoids constraining the operation of a high performance modem (such as a V.90 modem).

Abstract: An ATM switching apparatus for a switch system is connected between a plurality of trunk connection units connected with a TDM network and an ATM connection unit connected with an ATM network. The ATM cell converting unit converts trunk data, inputted over the trunk connection units, to an ATM cell which is outputted to the ATM connection unit or converts an ATM cell, supplied from the ATM connection unit, to trunk data which is to be outputted to the trunk connection units. Accordingly, the ATM switching apparatus and method have an advantage of mutually operating the TDM network and the ATM network.

Abstract: A telecommunications system comprises an asynchronous transfer mode (ATM) network having uncommitted bandwidth, and a plurality of adaptive grooming routers (AGR) coupled to the network. The AGRs comprise a group adapted to function as a virtual transit exchange whose fabric and control are distributed over the group. The vitual comprising the AGRs incorporates independent connection control and call routing functions and has means for determining the current system status whereby to set up narrow band connections across the ATM network based on that status determination.

Abstract: A packet-based communication system includes a transmitter which configures multiple channels of encoded voice information for transmission through the system to a receiver. In an illustrative embodiment, the transmitter determines a total number of active channels to be coded at each of a number of different available code rates, within a specified bandwidth constraint. The transmitter assigns the code rates to the active channels in accordance with a code rate assignment technique, such that the bandwidth constraint is satisfied for a defined time period, e.g., a voice channel sample period. The code rate assignment technique may be, e.g., a random rate assignment technique, a round robin rate assignment technique, or an oldest talking channel to lowest rate assignment technique.

Abstract: An improved system and method for transporting ATM information over a communications channel by enabling a single 4-octet ATM header to be prepended to user data, thus forming a low overhead ATM cell. Furthermore, an alternative embodiment of the invention may be used to simultaneously transport a plurality of 52 octet ATM frames in conjunction with the low overhead cells.

Abstract: A first header converting section outputs, when partial fill cells are inputted to the first header converting section the partial fill cells, while converting a VPI of each of the partial fill cells into a value that is a unit of a multiplexing process at a short cell multiplexing section and converting a VCI of each of the partial fill cells into a value to be a CID which is to be stored in a short cell at the short cell multiplexing section. The short cell multiplexing section receives a plurality of the partial fill cells from the first header converting section to multiplex a plurality of the short cells within the partial fill cells for every VPI of the partial fill cells, and produces an AAL Type 2 cell in which the VCIs of the partial fill cells are stored as CIDs and the VPIs of the partial fill cells are stored as VCIs.

Abstract: An ATM cell constructor (100) of an ATM transmitter assembles a stream of frames of constant bit-rate traffic received on a listen TDM bus (102) into cell payloads (1104) using ATM adaptation layer 1 (AAL1). Once every eight cells, the AAL1 structured data transfer (SDT) cell constructor layer (112) introduces a one-octet SDT offset pointer (1120) into the payload. This pointer designates traffic-block (TDM frame) boundaries. The payload with an attached ATM header forms an ATM cell, and the constructor transmits a stream of the ATM cells to an ATM cell deconstructor (2100) of an ATM receiver. The deconstructor disassembles the payloads of the received ATM cells and transmits the stream of frames of constant bit-rate traffic on a talk TDM bus (102). In response to each received SDT offset pointer, the deconstructor's time slot interchanger (TSI 2108) resets to the start of frame-processing, thereby aligning frames formed by the TSI with the received frames.

Abstract: Methods and apparatus for communicating data between continuous bit rate trunk channels and a cell-based network are disclosed. The apparatus includes trunk interface circuitry, data interface circuitry, and cell segmentation circuitry. The trunk interface circuitry receives continuous bit rate call data that is being communicated from an originator to a recipient. The data interface circuitry is operatively coupled to the trunk interface circuitry, and is operable to receive the call data from the trunk channel and to extract an original data stream. The cell segmentation circuitry is operative to receive the original data stream from the data interface circuitry and to produce data cells. The invention also features methods of producing data cells.

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: Signaling information is communicated over an ATM link or other packet-based communication link using packet headers. The information may be, for example, telephony signaling information such as an on-hook/off-hook indicator, a ring/no-ring indicator, or any other type of information used in establishing, maintaining, terminating or otherwise configuring a telephony-based communication. In an illustrative embodiment, a single bit of signaling information is incorporated into a low order bit of a packet type indicator field in a header of an ATM user data cell. This low order bit, which is generally used as an End of Message (EOM) indicator in a cell which is part of a multi-cell message, can be used to transmit the signaling information in packets corresponding to single-cell messages.

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: An ATM switching device and method for providing voice call service. In the ATM switching device, input time switch modules are connected to an input PSTN interface to switch channel data received over sub-highways to voice stream data grouped in accordance with destinations by sorting the received channel data according to time slots corresponding to numbers of destination time switch modules. Input cell assembly and disassembly modules are connected to the input time switch modules to assemble a group of voice data headed for the same destination into an identical ATM cell. An ATM switch is connected to the input cell assembly and disassembly modules and to an ATM interface to self-route the ATM cell, to switch the ATM cell, and to output the switched ATM cell to a corresponding destination. Destination cell assembly and disassembly modules disassemble the ATM cell received from the ATM switch into voice stream data.

Abstract: In a telecommunications system, in which a connection comprises a part with an interworking function at both ends, a channel is allocated to the connection between the interworking functions. The required channel capabilities may vary during the connection, whereby the channel capabilites should be changed. When the first interworking function detects that a channel capability must be changed, a first message, which indicates the desired capability change, is transmitted (2-1) to the second interworking function; and the channel capability is changed (2-3, 2-5) into the desired one at both ends of the part.

Abstract: A method of changing the characteristics of telephone call data on an ATM network that is initially transmitted via a first SVC between a first ATM switch and a second ATM switch is described. The method includes the steps of sending a set-up message for a second SVC from the first ATM switch to the second ATM switch and sending a switch-over request message from the first ATM switch to the second ATM switch via the second SVC. The method further includes the steps of sending a switch-over acknowledge message from the second ATM switch to the first ATM switch via the second SVC and sending a switch-over begin message from the first ATM switch to the second ATM switch via the second SVC. The method further includes the steps of sending a switch-over confirm message from the second ATM switch to the first ATM switch via the second SVC and transmitting the telephone call data via the second SVC.

Abstract: The ATM equipment according to the present invention is composed of a voice circuit interfacing section (310) connecting to voice devices, an interexchange channel interfacing section (320) connecting ATM lines, a cell composing and decomposing section 313 celling voice signals from the voice circuit interfacing section (310) and also decelling a cell received from the interexchange channel interfacing section (320) to produce voice signals, a SVC control section (360) performing connecting/cutting control of a telephone call path in the ATM lines by a switch type virtual connection method, and a main control section (340) connecting the interexchange channel interfacing section (320) to the voice circuit interfacing section (310) when the voice devices are called in the case when the SVC control section (360) performs the connecting and cutting control of the telephone call path in the ATM lines, so that the ATM equipment can deliver well a ringback signal, a busy signal, or the like sent out from a telephon

Abstract: In a method and network component of a communications network for switching connections of low bit rate between input modules and output modules, the input modules and the output modules form a first switching level, and an ATM switching stage arranged between the input modules and the output modules forms a second switching level. In the first switching level, a number of low bit rate connections at the input module, which are to be transmitted to the same output module, are respectively merged by the input module into at least one ATM connection. In the second switching level, the switching through of the ATM connections for transmitting data in ATM cells ensues by the ATM switching stage. Subsequently, in the first switching level, the ATM connections which have been switched through are converted by the output module into the low bit rate connections.