Abstract: A method and apparatus are provided to transport private line traffic over an ATM network. A first plurality of TDM private line traffic links, such as T1 or E1 circuits, are multiplexed to create a first rt-VBR virtual circuit such that the bandwidth of the first rt-VBR virtual circuit is not limited. A second plurality of TDM private line circuits are multiplexed to create a second rt-VBR virtual circuit such that the bandwidth of the second rt-VBR virtual circuit is not limited. This may be done by AAL2 multiplexing with substantially large SCR, PCR and MBS values and the removal of T1 frames that do not contain data (that is, frames that contain only frame delimiters). The first and second rt-VBR virtual circuits are combined for transport over a link in the ATM network. An overload control process may be performed based on the ATM network link utilization.

Abstract: A multiplexing system in an ATM network is disclosed. The system produces low deviation in generation timing of a standard ATM cell and low transmission delay to realize high transmission efficiency. A cell multiplexing means is provided for assembling data received from a plurality of terminal lines into a short cell to be multiplexed into a standard ATM cell. A short cell is selected from a plurality of short cells to define a reference line. The short cell generation timing of the reference line is used as the reference timing to generate short cells for other lines so as to synchronize the generation timing. The short cells thus generated are then multiplexed into a standard ATM cell.

Abstract: Methods and apparatuses for processing media data for transmission in a data communication medium. A set of data indicates how to transmit a time related sequence of media data according to a transmission protocol. The set of data, includes a time related sequence of data which is associated with the time related sequence of media data. The set of data may be utilized by a digital processing system to transmit the time related sequence of media data (e.g., by packets generated according to the transmission protocol and the set of data).

Abstract: The invention relates to a method and apparatus for multiplexing traffic from a plurality of fixed bit rate sources over an ATM network. The traffic from the fixed bit rate users is multiplexed to form a TDM trunk group which is assembled into AAL2 minicells prior to being converted to ATM cells for transmission on the ATM network. By combining the fixed rate traffic sources into a TDM trunk group and then mapping the trunk group into AAL2 minicells, it is possible to improve efficiency of fixed bit rate traffic transmission using the ATM protocol.

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 system and method for transmission over a bus between ATM layer devices and PHY layer devices which exist on different printed circuit boards use a ATM-PHY layer interface connected to the ATM and PHY layers across a bus. Data and control signals are transmitted across the ATM-PHY interface consisting of a single clock and one or more pairs of data leads. Asynchronous cell transmission without flow control, with cell level flow control and with byte/octet level flow control as well as cell synchronization are possible. The number of signals required to connect the PHY/ATM layer devices are dramatically reduced by transporting the data and control information using in-band signaling.

Abstract: An apparatus for and a method of generating pointers for identifying structure boundaries of data for leased lines such as T1/E1 in an asynchronous transfer mode (ATM) adaptation layer Type 1 (AAL1) through an ATM layer.

Abstract: A method of converting a permanent connection, such as a PVC, into a signalled permanent connection, such as an S-PVC, in a connection-orientated network, such as an ATM network, without service disruptions. The method includes the steps of: (a) establishing signalling links between each network node along the path of the permanent connection; (b) providing information to identify the cross-connections along the path; (c) incorporating the cross-connect identification information in a call set-up message; (d) signalling the call set-up message along the path from a source network node to a destination network node; and (e) associating the cross-connection of each node along the path with the appropriate signalling links in order to form the signalled permanent connection. The cross-connect identification information may be a unique call identifier for the permanent connection, in circumstances where the call identifier is associated with the permanent connection cross-connections prior to Step (d).

Abstract: A method and apparatus are provided to remove dataless TDM frames when transporting private line traffic over an ATM network. A number of TDM frames comprising a TDM private line circuit are received, and it is determined if a TDM frame contains data. The determination may be based on, for example, the detection of one or more frame delimiters, such as by comparing information in the TDM frame with a pre-determined frame delimiter pattern. Information from the TDM frame is placed into an ATM cell only when the TDM frame contains data. An indication that a TDM frame has not been placed into an ATM cell is conveyed in the AAL2 headers.

Abstract: A method of inverse multiplexing and demultiplexing multiple ATM communication channels. This process is intended to maximize the use of bandwidth on all channels when the bandwidth conditions on each channel are fluctuating dynamically with time. In extreme cases, this method is intended to work even when one or more channels cease to operate. The multiplexing part of this method seeks to maximize the bandwidth along all communication links as well as maintaining a record of the bandwidth fluctuations along the channels. The demultiplexing part of this method seeks to accurately reconstruct the ATM cell stream that was inverse multiplexed across the multiple communication links by ordering the cells in the same order as they were sent. Two processes are presented by which this is done.

Abstract: Provided is an IP QoS management mechanism for modern wireless networks to guarantee delivery of IP services with the required quality through the networks to customers. A layered QoS management architecture is provided which performs the QoS control over the entire communication protocol stack of a wireless network. The architecture consists of two levels of IP QoS management with an adaptation interface between them. These different functional and adapting levels are called from top to bottom, Upper Layer QoS Management (ULQM), IP QoS adaptation (IQA), and Lower Layer QoS Management (LLQM).

Abstract: A method for verifying the integrity of data payloads of ATM cells passing through a switching device involves computing a payload integrity verification code for the payload portion of an ATM cell. The payload integrity verification code may be generated according to any error detection or error correction scheme. Preferably, the payload integrity verification code is stored in a portion of the standard ATM cell header which is not used while the cell is passing through the switching device. Preferably the payload integrity verification code is stored in all, or a portion of, the virtual path identifier or virtual connection identifier fields. The invention allows for the immediate identification of cells having corrupted payload data. Different actions may be taken on the detection of errors in the ATM cell header and ATM cell payloads respectively.

Abstract: The present invention provides an ATM cell assembling/disassembling apparatus capable of reducing power consumption. A reception VC detector 16 decides whether a reception cell is valid. A reception controller 17 performs disassembling and error check of a cell which has been decided to be valid by the reception VC detector 16 before issuing a DMA transfer request. A DMA output block 12 reads out a reception payload data from a reception data buffer 18 and DMA-transfers the data to a host memory 3. A reception clock controller 20 starts clock supply to the reception controller 17 when the reception VC detector 16 has decided that the reception cell is valid, and terminates the clock supply to the reception controller 17 upon completion of processing for one cell in the reception controller 17.

Abstract: The invention allows a voice data transmission in a mobile radio network to be optimized by means of a conversion device. Said device converts voice data that has been transmitted a TRAU 3 in a TFO mode into a packet data format, for transmission to an additional switching device via a long-distance switching network, thereby adapting the signaling if necessary.

Abstract: Example embodiments of protocol multiplexing systems comprise a multiplexer which receives multiplexed packet(s) and which uses contents of the multiplexed packets to form carrying packets which are stored in an output buffer. Some of the multiplexed packets belong to differing ones of plural virtual channels, but the multiplexer uses multiplexed packet(s) belonging to only one virtual channel to form a given carrying packet. The multiplexing systems accommodate transmission on a same virtual path of numerous connections belonging to differing virtual channels, balancing both payload efficiency and delay considerations.

Abstract: An ATM cell switching system is disclosed. The system includes more than one node connected between a highway transmitting a subscriber data and a high speed line of an ATM type for implementing a converting operation between the subscriber data and an ATM cell, and an ATM switching unit for receiving an ATM cell from one among the nodes through the high speed link, judging a destination based on a header information and routing the ATM cell to another one among the nodes.

Abstract: There is provided an AAL2 processing device comprising an AAL2 synchronizer for receiving an AAL2 cell in which at least one AAL2 packet is multiplexed, and detecting a start point of each packet to synchronize the packet; an AAL2 switch for switching the synchronized packet according to routing information provided during call setup; and an AAL2 formatter for multiplexing the switched packet according to ATM connections, and generating an output AAL2 cell having the same format as the input AAL2 cell. Further, the AAL2 processing device comprises a CID changer interconnected between the AAL2 synchronizer and the AAL2 switch, for determining whether there are packets to be switched to the same ATM connection at the same time out of the packets to be switched by the AAL2 switch by using the cell routing information, and changing, when there are such packets, the CIDs of the packets so that the CIDs of the packets are not identical to each other.

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: The present invention relates to an ATM-PON system realizing an access network of FTTC/H(fiber-to-the-curb/home), more particularly, to an optical network unit function processing apparatus in ATM-PON system linked directly to a plurality of subscriber's lines.

Abstract: An ATM cell multiplexer is arranged so that in the up direction from the terminal equipment to the ATM switchboard cells from a cell terminal portion in CLAD units are held in a cell holding portion through a Utopia Level 2 interface under the control of a communication controller in the CLAD units, and an ATM bus scheduler makes the cell holding portion transmit the cells to an ATM bus by assigning a transmission right for every cell holding portion of the CLAD units in accordance with a preset schedule table based on at least one of predetermined service categories and a traffic control corresponding to a traffic quantity, while in the down direction from the ATM switchboard to the terminal equipment the cells are broadcast from the ATM bus to the cell holding portion of each CLAD unit for a cell transfer and the communication controller makes the cell holding portion transfer the cells to the cell terminal portion through the Utopia Level 2 interface to decide whether or not the cells are addressed to itse

Abstract: A technique for implementing an automatic port discovery protocol in a virtual private network cross-connect is disclosed. In one particular exemplary embodiment, the technique may be realized by a method comprising the steps of implementing a virtual private cross-connect for supporting a plurality sites associated with at least one virtual private network; providing at least one connection between the virtual private cross-connect and each site; and supporting a combination of at least two of layer-3, layer-2 and layer-1 services.

Abstract: A system and a method of the present invention for implementing a combined use Timer_CU within an ATM transmitter. The ATM transmitter being able to handle a plurality of ATM channels, at least one of the channel being an ATM AAL2 channel. The ATM channels can provide ATM-cells at different traffic parameters, such as, for example, different cell or bit rate, priorities, and bursts. The system schedules channels in a first table by channel identifiers. Cyclical pointers to this first table advance (i) at every time slot, (ii) within a time slot, whereas (iii) CPS-Packets with one or more octets already packed wait at most the duration of a Timer_CU before being scheduled to be sent by CPS transmitter to ATM transmitter. Conveniently, the schedule scheme is based upon a scheduling table comprising of a plurality of time slots.

Abstract: A network arrangement for transporting service (Servco) traffic between terminals via an asynchronous path comprises a servco access layer incorporating multimedia gateways for access by said terminals, an asynchronous network layer, a service layer incorporating adaptation layer switches each coupled to the network layer, and a transport layer providing a connection medium between the adaptation layer switches. The Servco traffic is carried in ATM minicells over the network layer. Delineation of the minicells is effected by searching the received ATM stream for a valid code word indicating the start of a minicell, and, for that minicell and subsequent minicells, determining length information so as to determine the start of each next minicell.

Abstract: Herein disclosed is a unicast-to-multicast converting apparatus comprising: a unicast network interface for receiving monitoring data including a plurality of UDP unicast data packets; a packet buffer for temporally storing the UDP unicast data packets received from the unicast network interface; a converting table storage section for storing conversion key information and a conversion rule table indicative of relationship between source entities and destination entities; a converting judging section for sequentially comparing each of the UDP unicast data packets stored in the packet buffer with the conversion key information stored in the converting table storage section to judge that a UDP unicast data packet is to be multicast when the UDP unicast data packet matches with the conversion key information and determining UDP unicast data packets to be multicast; a converting section for converting the UDP unicast data packets to be multicast determined by the converting judging section into a plurality of UDP

Abstract: A method of routing an ATM cell in an ATM network and routing an ATM cell and a structure of an ATM adaptation layer in an ATM network. Data based on an ALL-Type2 (ATM Adaptation Layer Type2) and an AAL-Type5 (ATM Adaptation Layer Type5) is transferred to the same destination. This enables data based on ATM adaptation layers of different types to be transferred to the same destination at the same time.

Abstract: An AAL2 packet exchange device is placed in front of an ATM switch for executing CPS packet re-multiplexing into ATM cells. The AAL2 packet exchange device extracts CPS-PDUs (Common Part Sublayer-Protocol Data Units) from ATM cells which are supplied from input ATM lines, extracts CPS packets from the CPS-PDUs, alters CIDs (Channel IDentifiers) of the CPS packets if necessary so that CID collision will not occur between CPS packets supplied from different sources to be outputted to the same output ATM connection, multiplexes the CPS packets to be outputted to the same output ATM connection in ATM cells of the same output ATM connection. The CID alteration is executed by referring to a path setting table which stores each correspondence between a first internal address for discriminating between input ATM connections, an input CID, a second internal address for discriminating between output ATM connections, and an output CID.

Abstract: A modem operable to facilitate communication between a host and a communications link includes a memory operable to store a rate control algorithm. The modem further comprises a controller operable to receive from the universal serial bus a first USB segment comprising a first plurality of ATM cells and rate control information associated with the first plurality of ATM cells, to store the first plurality of ATM cells in the memory, to perform the rate control algorithm on the first plurality of ATM cells using the rate control information received in the first USB segment, and to transmit each of the plurality of ATM cells at a particular transmission rate according to the results of the rate control algorithm.

Abstract: In a multiplexer, a channel selection controller determines which channel code is to be selected for a control data generator, each of multiplex buffers, and null packet generator, a PTS/DTS controller replaces PTS with DTS in a program being multiplexed, an output controller reads and deliver TS at a time synchronous with a system clock, and a virtual decoder buffer simulates each of T-STD buffers as in MPEG2.

Abstract: Embodiments for communicating between a headend and multiple subscriber units in an interactive video entertainment network are described. The headend includes multiple ATM switch ports connected for data communications through individual communications channels. In one aspect, an assignment of an individual subscriber unit to one or more communications channels is requested. Next, relative available capacities of the communications channels are assessed. The individual subscriber unit is then assigned to one or more communications channels and corresponding ATM switch ports based on the assessed capacities of the communications channels. The individual subscriber unit is set to communicate with the headend over its assigned communications channels. An ATM virtual connection between the individual subscriber unit and the headend is then established through the communications channels and corresponding ATM switch ports assigned to the individual subscriber unit.

Abstract: A method for processing packets in a router includes specifying operations on packets as chains of processing elements. Each chain is uniquely associated with one interface/protocol pair, and each processing element performs at least one function on a packet. An incoming packet is received, and processed, first by a demultiplexor element which determines the protocol of the next higher level used by the packet. Then, the packet is processed by the elements of a decapsulation chain associated with the interface on which the packet was received, and by the elements of an encapsulation chain associated with the interface on which the packet is to be transmitted. The demultiplexor element or operation passes the packet on to a decapsulation chain associated with the protocol and with the incoming interface, depending on protocol information contained in the incoming packet.

Abstract: In an adaptation layer switching network, functional partitioning is provided by providing a separation between service specific sublayers (SSCS), common part sublayers (CPS) and transport convergence. This enables the support of a range of SSCS functions via common set of CPS blocks.

Abstract: An arrangement for interfacing between TDM and ATM networks consists of a family of devices that comprises two groups. The first group comprises devices that perform multiplexing, segregation and routing field translation for the respective traffic type. They may also remove or substitute an outermost layer of encapsulation. These first group devices are bi-directional and output buffered with respect to the network. The second device group comprises devices that perform format conversions between the service payload (voice, video or data) and an adaptation layer control format. These second group devices are also bi-directional and buffering depends on the particular function, e.g. real-time, segmentation.

Abstract: A traffic shaping method and apparatus which prevents a violation to a peak rate caused by a fluctuation of a flow of ATM cells outputted from a frame crossing over circuit is provided. A traffic shaping apparatus which includes a traffic shaper for shaping input ATM cells and a frame crossing over circuit for crossing over the frame period of output ATM cells outputted from the traffic shaper is provided with an output rate supervision circuit which supervises the transmission rate of output ATM cells and transmits, if it detects an overhead inserted in the output ATM cells, a back pressure to the traffic shaper to stop the traffic shaping operation of the traffic shaper. However, if the transmission average rate exhibits a drop, then the output rate supervision circuit transmits output rate information to the traffic shaper so that the traffic shaper may perform its traffic shaping operation until the transmission average rate rises to an allowable maximum rate set in advance.

Abstract: A Finite State Machine (FSM) for a Bearer Channel Connection (BCC) between a V5.2 interface and an Asynchronous Transfer Mode (ATM) interface is disclosed, including a V5.2 Interface Control Process FSM (TAM) that connects and releases a V5.2 bearer channel by controlling the V5.2 interface between a Local Exchange (LE) and a gateway; and an ATM Interface Control Process FSM (RAM) that connects and releases an ATM bearer channel by controlling the ATM interface between the gateway and an access gateway.

Abstract: A slave interface unit controls the exchange of data between a master processing unit and a plurality of slave processing units operating in the asynchronous transfer mode (ATM) of operation. The ATM slave interface unit has a receive unit and a transmit unit that exchange data cells and control signals with the ATM master processing unit. The receive unit and the transmit unit are coupled to a receive buffer storage unit and a transmit buffer storage unit, respectively. The receive buffer storage unit and the transmit buffer storage unit exchange data and control signals with the direct memory access unit. The ATM slave interface unit includes a configuration interface unit having a register that identifies the location in the data cell where the destination address is located and relates the destination address to the particular processing unit or memory location. The receive buffer unit uses the information in the register to determine the destination of the data cell.

Abstract: An analysis method provides a bandwidth calculation for employing voice communications over fast packet (FP) networks such as frame relay or ATM. Many companies currently have internal phone systems such as private branch exchange (PBX), which provide for the transmission of voice communication within an enterprise, but also a connection to the public switch telephone network (PSTN). In addition, PBX systems may be interconnected via a system of inter-PBX tie trunks, generally used for internal PBX-PBX communication. If a PBX system employs a private data network utilizing FP technology such as frame relay, it is now possible to route this inter-PBX voice traffic over the data network. In situations where the data network is a FP network such as frame relay or ATM, an analysis is performed to determine whether there is sufficient bandwidth to handle the voice traffic.

Abstract: For transmission of data frames (F1, F3) between a first mobile network element (BTS1, BTS2, BTS3) and a second mobile network element (TRAU) in accordance with the ATM (Asynchronous Transfer Mode) protocol, data frames (F1, F3) of different channels are split up in subframes (SF11, SF12, SF13; SF31, SF32, SF33), ordered and then embedded in respective minicells. Minicells (MC11, MC31) containing information of different channels are then combined into ATM cells (CELL) that are transferred between the first mobile network element (BTS1, BTS2, BTS3) and the second mobile network element (TRAU). In this way, transcoders in the second mobile network element (TRAU) can already start decoding data frames of several channels after receipt of the most urgent data which is contained in the first ATM cells (CELL).

Abstract: A PCM call processing apparatus includes an ATM processing unit for processing voice packets from an ATM switching unit of a mobile switching center, a traffic pool for processing PCM voice data, a PCM call processor interposed between the ATM processing unit and the traffic pool for performing selective transcoding operations based on data type, a network interface for connecting the traffic pool to a PSTN, and an IWU controller for controlling the ATM processing unit, the traffic pool, the PCM call processor, and the network interface.

Abstract: The present invention relates to a telecommunications system, nodes, device boards and methods in such telecommunications systems, where a node comprises a first device board, which includes a receiving section (25) having at least one input port (29, 31, 33), to which an input buffer (30, 32, 34, 36, 38, 40) is connected for receiving TDM-channels in TDM-frames, and having at least one transmitting buffer (42, 44, 45). A second device board includes a transmitting section (27) having a receiving buffer (48, 50, 51) for every other device board, at least one output port (59, 61, 63) and at least one output buffer (52, 54, 56, 58, 60, 62) for every output port. All TDM-channels received in input buffers intended for the transmitting section are copied to a corresponding transmitting buffer and the content of the transmitting buffer reaches the transmitting section through sending of at least one transport module solely containing all TDM-channels intended for said second device board.

Abstract: This proposal outlines an approach for interfacing Synchronous Transfer Mode (STM) and Asynchronous Transfer Mode (ATM) networks and for transporting voice, fax and voice-band data calls by the ATM network in an efficient manner. In contrast to the well known ATM Variable Bit Rate (VBR) approach, this proposal allows one to transport 64 kb/s traffic efficiently over ATM by re-using STM network signaling and exploiting the standard AAL-1-type adaptation layer (intended for Constant Bite Rate, CBR, services). We use low bit rate encoding algorithms and achieve additional compression for speech by marking cells that do not contain talk spurts. The invention defines specific rules for STM-to-ATM interfacing, including all routing translation, and identifies necessary Terminal Adapter (TA) and ATM switch capabilities.

Abstract: According to the present invention, a switching method and a switching apparatus in a telecommunication network for connecting physical endpoints via a through switch connection are disclosed. The through switch connection is composed of legs and a leg connector, and a leg is composed of services and subconnections between the services. A leg being terminated by termination points and comprising specific services is formed by leg control means, and the specific services and subconnections between the specific services which form the leg are provided by connection control means, the services being terminated by termination points. Further, connection admission control means accept connections being part of the through switch connection.

Abstract: A method of communication in a communications network permitting efficient asynchronous file transfer from a server to a multiplicity of clients. The method is adaptable to future multicasting, telecommunications and file transfer protocols and provides the benefit of decreased communications network traffic relative to prior art methods with a corresponding savings of server, transmission link, router and router network resources. The method provides for sequential transmission of a dataset in discrete blocks over a single data connection spanning the router network. The method includes subsequent joining of destinations to a transmission already in progress. Each subsequently joined destination begins reception of blocks with the next sequentially transmitted block and continues to receive blocks until all blocks in the dataset have been received.

Abstract: A communications management system service as an interface between an ADSL (Asynchronous Digital Subscriber Line) terminal and an ATM exchanger. The system includes a control section, an upstream cell processing section, and a down stream cell processing section. The control section receives user cell signals from a subscriber terminal and converts the user cell signals to ATM cells. The upstream cell processing section then converts the ATM cells into signals for transmission to a subscriber control system. The downstream cell processing section converts signals received from the subscriber control system to ADSL signals to be sent to the subscriber terminal. The ADSL signals may be E1 signals. To check for errors in the system, the controller sends a test cell through the system. When the test cell loops back to the controller, it is compared to the test cell as it was initially generated. A decision concerning system errors is then made based on this comparison.

Abstract: Methods and apparatuses for processing media data for transmission in a data communication medium. A set of data indicates how to transmit a time related sequence of media data according to a transmission protocol. The set of data, includes a time related sequence of data which is associated with the time related sequence of media data. The set of data may be utilized by a digital processing system to transmit the time related sequence of media data (e.g., by packets generated according to the transmission protocol and the set of data).

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: In an ATM transmission system in which a plurality of ATM cells are grouped to a packet with an end of ATM cell having an EOP (End Of Packet) flag, a transmitting station comprises a transmit buffer for storing temporarily ATM cells to be transmitted, a transmit cell process means which discards all the ATM cells in the group in case that a NAK response indicating loss or wrong reception of an ATM cell is received from a receiving station, and an EOP cell generator for transmitting an EOP cell which has said EOP flag in stead of the discarded ATM cells. As no ATM cell in a packet is transmitted after an erroneous ATM cell is detected, no useless ATM cell which would be discarded in a destination terminal equipment because of an erroneous ATM cell occupies a transmission line when an erroneous ATM cell is detected, and traffic is saved.

Abstract: The invention is a system for providing virtual connections through an ATM interworking multiplexer on a call-by-call basis. A signaling processor receives signaling for a call and selects the virtual connection for the call. The signaling processor generates new signaling that identifies the selection and transfers the new signaling to the ATM interworking multiplexer that accepted the access connection for the call. The multiplexer converts user information from the access connection into ATM cells for transmission over the virtual connection in accord with the new signaling.

Abstract: An asynchronous transfer mode adaptation layer switching network has independent call routing and connection control for setting up connections across the system. A plurality of adaptation layer switches (ALS) coupled to the ATM network comprise a group adapted to function as an adaptation layer switching network whose fabric and control are distributed over the group. The network having means for determining its current system status whereby to set up multimedia calls across the network based on that status determination.

Abstract: In an asynchronous transfer mode (ATM) based transmission network, call control signaling information associated with a first telecommunications signaling protocol, such as an N-ISDN system 7 signaling protocol, is bound to bearer control signaling information associated with a Q.aal2 signaling protocol, where both call control signaling information and bearer control signaling information are required to set-up and maintain an ATM network connection. Binding the call control signaling information and the bearer control signaling information is accomplished as a function of the circuit identification code associated with the call control signaling information, where the circuit identification code is transferred from the N-ISDN system 7 signaling protocol to the Q.aal2 signaling protocol.

Abstract: A device and method are disclosed for correctly restoring a read clock when there are a plurality of STM data stream transmission sources. In a CES device of an ATM communication system, ATM cells from respective connections, which are to be delivered to the same outgoing line, are accumulated in a reassembly buffer memory and a PLO control unit aggregates the amount of ATM cells accumulated in the reassembly buffer memory for each connection. Subsequently, the PLO control unit calculates the frequency of a read clock based on the amount of accumulated ATM cells for each connection. A PLO restores the read clock which is applied to read data from the reassembly buffer memory for delivery to an STM network.