Abstract: A switch of a network for switching data. The switch includes a fabric for switching the data. The switch includes a parity fabric. The switch includes a connection mechanism connected to the fabric for providing data to and from the fabric and connected to the parity fabric for providing parity data to and from the parity fabric. The switch includes a first port card which receives data at a first rate from the network or sends data at the first rate to the network, performs first parity calculations on the data received at the first port card, produces first parity data from the first parity calculations or sends data at the first rate to the network. The switch includes a second port card which receives data at a second rate from the network or sends data at the second rate to the network, performs second parity calculations on the data received at the second port card, produces second parity data from the second parity calculations or sends data at the second rate to the network.

Abstract: A broadband packet switch that handles all packets that arrive within the same frame time by simultaneously bit-pipelining the packets into different sections of the one-stop packet buffer through an input switch. Each packet remains in is selected section until its eventual exit from the buffer through an output switch. Access to the memory storage in which the packet buffer resides is not through a memory bus or buses, thereby engendering massive parallel access.

Abstract: The present disclosure is generally directed to a system and method of measuring transport utilization of data that is to be multiplexed and transmitted over a digital transport facility. In a particular embodiment the method includes receiving at least one frame of a data channel at a time division multiplexing device, padding an unused portion of the frame with a number of stuff bits, determining a user traffic utilization measurement based on the number of stuff bits and based on the size of the data payload, and reporting the traffic utilization measurement. In this embodiment, the frame has a fixed data payload.

Abstract: A network system for carrying out communication between a control station and a plurality of devices connected to a network. The communication includes data communication which requires real-time attributes and message communication which does not require real-time attributes. The data communication includes a first data communication, and a second data communication. The system includes a plurality of transmission queues for temporarily storing transmission data provided in the control station, wherein one of the queues holds transmission data for the second communication. After the first data communication is carried out in accordance with a predetermined cycle time, an appropriate switching between the message communication and the second communication is carried out in the remaining time of the cycle time to complete one cycle, whereafter the cycle is repeatedly carried out.

Abstract: A communications network employs an optical communications medium carrying a synchronous communications transport signal including a number of time-division-multiplexed (TDM) channels. A number of bridges include respective interfaces to associated local area network (LAN) segments, and the bridges are coupled to the communications medium by associated add-drop circuits. Each add-drop circuit groups the TDM channels of the transport signal into bundles, each bundle being associated with a different bridge. Each add-drop circuit transmits data traffic originated by the associated bridge on only the bundle associated with the bridge, receives data traffic from the other bridges via the bundles associated with the other bridges, forwards the received data traffic to the associated bridge, and re-transmits at least some of the received data traffic on the bundles for receipt by another of the add-drop circuits.

Abstract: Low speed switches operated under the common control of a global scheduler can be used to switch high speed data while preserving packet ordering if the incoming packets are queued in a temporal order. By operating several low speed switches in parallel, a high-speed switching capacity can be realized.

Abstract: A mobile communications system includes base stations and mobile units. A power control scheme is provided in which a mobile unit can enter into a discontinuous transmission (DTX) mode. During DTX mode, the mobile unit is not transmitting traffic channels that can be monitored to determine frame errors so that the target ratio of energy per bit to noise spectral density (target Eb/No) can be adjusted. Instead, the base station monitors bit errors of bits in a pilot channel communicated by the mobile unit during DTX mode. Using this technique, the target Eb/No can be adjusted even when the mobile unit is not transmitting traffic channels, so that outer-loop power control can be performed. A number of mechanisms can also be used to detect when a mobile unit has entered DTX mode.

Abstract: A method of regulating queuing delay in a network routing device independent of TCP loading is provided including receiving data packets, monitoring the data packets using token buckets and a Proportional and Integral (P+I) Active Queue Management (AQM) scheme, marking selected data packets falling within a profile, and adjusting flow preference of the monitored packets.

Abstract: A flexible slotted Aloha communication protocol for a burst-type communication network divides a communication channel into a series of time cycles, with each time cycle further divided into contiguous time slices of identical duration. All data transmissions in the network begin at the start of a time slice and continue for an integer number of time slices, with the identity of the transmitting terminal, the length of the transmission and error correction, being included within the first time slice of each data transmission. Communication terminals in the network transmit reservation requests to a network hub which receives the reservation requests and reserves reserved time slots each having a number of time slices which matches the length of the data transmission to be transmitted in the reserved time slot. The reserved time slot may include time slices in more than one time cycle.

Abstract: Data input and output circuits that support multi data rate and a number of timing schemes. In one design, a data output circuit includes an input multiplexer, data latches, an output multiplexer, and at least one output driver. The input multiplexer receives a set of data bits in a first order (e.g., odd and even) and provides the data bits in a second order (e.g., first and second). The data latches can latch the data bits with (1) a latch signal to satisfy memory access timing requirements and (2) a data write clock signal to satisfy output timing requirements. The output multiplexer multiplexes the latched data bits to provide time multiplexed data bits. The output driver(s) provide signal drive for the time multiplexed data bits. Clock signals with various timing characteristics can be used to allow the data output circuit to satisfy various timing requirements.

Abstract: A method and system for transmitting at least one client signal within a server signal which has a predetermined transmission bit rate, with the transmission bit rate of the client signal and the transmission bit rate of the server signal being different. To this end, at least one identification number, which indicates the transmission bit rate relationships, is determined for at least one client signal at the transmission end, and the data in the at least one client signal are inserted uniformly into the server signal via sigma-delta modulation and using the determined identification number. The server signal is transmitted with the determined identification number and, at the receiving end, the data in the at least one client signal is determined via sigma-delta modulation and using the transmitted identification number.

Abstract: A communications network includes a communications medium with a synchronous communications transport signal including time-division-multiplexed (TDM) channels, bridges having respective interfaces to different local area network (LAN) segments, and add-drop circuits coupling associated ones of the bridges to the communications medium. Each add-drop circuit groups TDM channels of the communications transport signal into a bundle, and schedules the use of the bundle to carry data traffic originated by the associated bridge and to carry data traffic originated by the other bridges. Data traffic originated by the associated bridge and destined for the other bridges is transmitted on the bundle in accordance with the scheduling. For data traffic received from the other bridges via the bundle, it is determined whether the received data traffic is destined for the associated bridge, and if so then it is forwarded to the associated bridge.

Abstract: Effective bandwidth of a communication link is determined in a heterogeneous, packet switched network between a source and a destination, where effective bandwidth is defined as the actual available bandwidth between the server and the client, minus the overhead of the various network protocols used to transmit the data. The method includes measuring transmission times between the source and a destination for a plurality data segments having different characteristics, such as different sized files or subfiles of data; processing the transmission times to cancel effects of transmission latencies other than the different characteristics of the data segments; and indicating a bandwidth based on said processing. The processing is done in parallel with the return of user resources to the destination, and using a bandwidth detection engine associated with a proxy server.

Abstract: A method for preventing out-of-ordering of frames in a network switch, wherein the method includes the steps of receiving a first portion of a string of packets from a source port on a first port, transferring the first portion of the string of packets to a second port for transmission to a destination, and sending an indicator from the first port to the second port. The method further includes the steps of receiving the indicator at the second port, sending a response indicator from the second port to the first port, and receiving a second portion of the string of packets from the source port on a third port. Additionally, a method for preventing out-of-ordering of frames in network switch, wherein the method includes receiving packets on a first ingress port from a source port, transmitting the packets from the first ingress port to an egress port for transmission to a destination, and determining to switch the receiving of the packets to a second ingress port.

Abstract: A switched network includes a buffer-less switch coupling the sending nodes and the receiving nodes. The switch transmits packets successfully delivered to the receiving nodes through the buffer-less switch with a fixed forwarding rate. The switched network resolves conflicts in requests for a transmission path on the switch from multiple packets by allocating the transmission path to a first requester in time for the transmission path. If multiple requests for a switch resource collide by requesting the switch resource at the same time, one of the requests is selected as a winner and the packet or packets associated with the remaining requests are dropped. The winning packet may be selected on a random basis or a round robin basis or based on some other criteria. The requests from transmission paths may be contained with the packets sent into the network and extracted on entry of the packet into the network.

Abstract: ?-law-to-A-law translating equipment is used for plural PCM telephone lines installed between countries different in a conversion law. This translating equipment is provided with plural ?-law signal receiving circuits, a multiplexer, a ?-law-to-A-law converter, a demultiplexer, plural A-law signal output circuits and a timing pulse generator. Each ?-law signal receiving circuit outputs parallel ?-law PCM signals synchronized with a reference frame pulse and the multiplexer time-division multiplexes these signals according to a time division system. The ?-law-to-A-law converter outputs a time-division multiplexed A-law PCM signal, the demultiplexer demultiplexes this time-division multiplexed signal and outputs plural parallel A-law PCM signals. The A-law signal output circuit outputs a serial A-law PCM signal to which a frame bit is added.

Abstract: A subscriber unit which prevents the transmission of data between communicating nodes until the data communication rate required by the communicating nodes has been established selectively suppresses the confirmation tone that a receiving node sends to an originating node. The transmission of voice, facsimile or modem data is prevented until the communication path has been established at the desired communication rate. This permits the subscriber unit to reliably transport encoded data at a plurality of data rates without precise synchronization.

Abstract: A high capacity switch for switching communications traffic. The high capacity switch has a plurality of differing granularity switching levels, each switching level having at least one switch node capable of performing a switching operation at the granularity of the switching level and at least two primary connections, each connecting one of the switching levels to another one of the switching levels. At one of the switching levels, at least one switch node is capable of switching communications traffic along at least one switch connection path established along one of the primary connections, and is also capable of switching communications traffic along at least one secondary connection to another switch node within the same switching level, such that each of the at least one switch connection paths established is filled to a predetermined level.

Abstract: A switching apparatus that is used for high-speed large-capacity routing and a communication apparatus and communication system that are used for an efficient recursive multicast. A matrix switch performs self-routing on a packet on the basis of a tag including output route information set in the packet. Selectors are located so as to correspond to N output ports P#1 through P#N of the matrix switch and perform N-to-one selection control. Setting registers hold selection information used by the selectors to select a signal.

Abstract: A system and procedure to automatically enforce policy in distributed multi-computer service applications. Such service applications include multiple software modules that execute on multiple computers. The computers have access to communications media that allow data communications between the computers. Logical ports are configured on different modules according to a logical model of the multi-computer service application. Each logical port is defined by port software. Logical data connections between the logical ports are configured in accordance with the logical model. Each port is configured to communicate through different numbers of logical data connections without modifying the port software. In response to the occurrence of a condition, a module sends an event notification to a policy module. The policy module responds to the notification by formulating a request for one or more destination modules. The policy module provides the request to an output port of the policy module.

Abstract: At a master controller of a space switch in a node in a data network, a request is received from a source node that requests a connection to be established through the space switch. This request is compared to other such requests so that a schedule may be established for access to the space switch. The schedule is then sent to the source nodes as well as to a slave controller of the space switch. The source nodes send data bursts which are received at the space switch during a short guard time between successive reconfigurations of the space switch. Data bursts are received at the space switch at a precisely determined instant of time that ensures that the space switch has already reconfigured to provide requested paths for the individual bursts. The scheduling is pipelined and performed in a manner that attempts to reduce mismatch intervals of the occupancy states of input and output ports of the space switch.

Abstract: Improvement is afforded in the recognition of wide-band data transmitted in the form of a data sequence to a network element of an analog, cellular network, notably a mobile radio set or a base station. The sequence includes a starting synchronization (DOT1), a word synchronization (WS), a data word (REP1) and number of repeats of a synchronization (DOT), a word synchronization (WS) and the data word (REP 1-REP 11). The network element recognizes, from received sequences, that a transmission of a sequence occurs when a starting synchronization (DOT 1) has been recognized, or alternatively when one of the further synchronizations (DOT) that is succeeded by a correct word synchronization (WS) has been recognized, and evaluates the data words (REP 1-REP 11) received each time subsequent to a recognized starting synchronization (DOT 1) that is succeeded by a word synchronization (WS), or received subsequent to a recognized further synchronization (DOT) that is succeeded by a correct word synchronization (WS).

Abstract: A packet switch includes ingress modules, egress modules, and a switch core. Packets of variable sizes may be divided into segments of predetermined sizes to facilitate switching within the switch core. The segmentation process may require null-padding which increases the flow rate within the switch. The segments are transferred from ingress to egress under flow-rate control based on inflating specified flow rates. Null padding is removed at egress. Ingress modules sort segments or packets according to their destination egress modules and egress modules sort segments or packets according to their ingress-module origin. Thus, segments of the same packet, and packets of the same stream, are properly concatenated as they appear in a logical buffer at egress. To enable growth of the packet switch to accommodate a very large number of ingress and egress modules, the switch implements a method of fast matching to schedule packet transfer across the switch core.

Abstract: Methods, apparatuses, media and signals for providing clear channel access on a network are disclosed. A first method involves receiving a communication signal from a remote network element. The communication signal includes a previous transport overhead (PTOH) portion indicative of transport overhead contents of the communication signal prior to arrival at the remote network element, and a previous path error (PPE) portion indicative of path errors present in the communication signal at the remote network element. The method then involves modifying a transport overhead portion of the communication signal in response to the PTOH and PPE portions.

Abstract: The band management circuit of the present invention is utilized in a fiber-optic network that uses, for example, ATM-PDS, in order for an SLT to control the transmissions of a plurality of ONU, which are accommodated by this SLT. The band management circuit of the present invention stores one time in a table an identification number, which specifies a multi-point device for which transmission is authorized. An identification number stored in a table is generated by a table generating portion. The table generating portion sequentially generates the identification number of a number of transmission authorizations determined in accordance with a transmission band provided to respective multi-point devices. A write/read control portion sequentially writes to a table identification number data generated by the table generating portion.

Abstract: A cross-connect device in an optical network which includes a demultiplexer for demultiplexing an input optical signal by channels; a plurality of arbitrary transmission optical receivers for converting the optical channel signals received from the demultiplexer to electrical signals and for recovering a clock signal and data according to a reference clock signal generated at the transmission rate of the electrical signals; a cross-connect switch for path-routing the electrical signals received from the arbitrary transmission optical receivers; a controller for controlling the path-routing of the cross-connect switch; a plurality of arbitrary transmission optical transmitters for converting the electrical signal received from each output port of the cross-connect switch to an optical signal; and, a multiplexer for multiplexing the optical signals received from the arbitrary transmission optical transmitters onto one stand of optical fiber.

Abstract: A high bandwidth connection is mapped through a multi-stage switch between an ingress node and an egress node via a center stage comprising M (an integer) center stage nodes. Each center stage node is connected to the ingress and egress nodes by respective links adapted to support m (an integer) respective connections. An m×M connection matrix of connections between the ingress node and the center stage is provided. Each column of the connection matrix contains 1≦j≦m connections between the ingress node and a respective one of the center stage nodes, and each row of the connection matrix contains 1≦k≦M connections between the ingress node and the center stage nodes. The high bandwidth connection is mapped through the multi-stage switch by layering the high bandwidth connection within the connection matrix. Thus the high bandwidth connection is divided into N segments.

Abstract: A method is provided for solving the mobility of a mobile trunk node (MTN) within an operated assisted mobile mesh local Ad-Hoc network. The method provides a reverse handover (RHO) when there exists another node within the local Ad-Hoc network, which is able to assume the logical role of a MTN. Before the first MTN performs the handover, existence of the other suitable MTN is determined. Where a suitable MTN is determined, the MTN functions are transferred to the new MTN before handover of the first MTN to a new cell of a cellular-based network. Upon transfer of the MTN functions to the new MTN, Ad-Hoc traffic is relayed to and from the local Ad-Hoc network via the new MTN. Enhanced tunneling is proposed to minimize network traffic delays during the handover. The reverse handover also enables the first MTN to preserve its original merely Ad-Hoc local network connection.

Abstract: A method for changing a network characteristic or capability, such as the communication rate of network segments, software version or protocol. All nodes in the network perform the change synchronously while continuing to communicate within the existing capabilities. A new configuration is downloaded to the nodes, and a manager node exchanges validation messages with the other nodes in order to verify that the nodes can be reconfigured and will be able to complete the process successfully. The manager node then sends a command message to the other nodes to execute the change. In response, the other nodes begin substantially simultaneously to communicate in accordance with the new characteristics and/or capabilities. This method helps to minimize the duration of the upgrade process, while avoiding traffic hits and minimizing abnormal operation that may occur during the upgrade.

Abstract: A synchronous transfer mode (STM)-256 adder/dropper which provides a communication path between STM-64 optical channels in an apparatus of multiplexing STM-64 optical channels into STM-256 electrical signals, is provided. The STM-256 adder/dropper transmits STM signals by multiplexing the STM signals at a low speed and simultaneously provides a communication path between lower channels.

Abstract: A method for fast and economic handling of overhead bytes of an incoming high order data stream to form a corresponding outgoing high order data stream, the method comprising a) presenting the incoming high order data stream as a plurality of N component data streams transmitted in parallel, b) providing a common overhead processing unit (COHPU) capable of handling overhead bytes of a single one of the component data streams, c) forwarding overhead bytes of the component data streams to the COHPU in a circular order, while keeping docketing (ID) information for each particular overhead byte; d) processing each of the overhead bytes in the COHPU, and e) modifying the N component data streams to obtain an outgoing high order data stream based on results of the processing and the ID information with respect to each of the processed overhead bytes.

Abstract: A packet-based telecommunication system (100) is disclosed, comprising a first media gateway (124) having a first CODEC structure (130), a second media gateway (126) having a dual function CODEC structure (132), wherein the dual function CODEC structure is adapted to provide tandem free operation between itself and the first CODEC structure, and wherein the dual function CODEC comprises a first element (134) adapted to negotiate tandem free operation, and a second element (136) communicatively coupled to the first element and adapted to selectively convert data coding responsive to the first element.

Abstract: A cordless telephone controls the handset unit power based on both RSSI value and CRC error rate (CRCE). The base unit requests the handset unit to set the power to “L” when the handset unit power information is “H”, the CRCE is judged to be not more than a predetermined rate, and the RSSI value is judged to be not less than a first predetermined value. The base unit further requests the handset unit to set the power to “H” when the handset unit information is “L” and the RSSI value is judged to be not more than a second predetermined value. Moreover, the base unit requests the handset unit to set to the power to “H” when the handset power information is “L”, the RSSI value is judged to be larger than a second predetermined value, and the CRCE is judged to be larger than a predetermined rate.

Abstract: An electronic apparatus according to the present invention includes two modules which decode high frequency analog signals. Furthermore, each of the modules is provided with an RF section at a position away from the center of the module in either longitudinal direction to carry out radio communications using high frequencies. In this electronic apparatus, the two modules are arranged so that their longitudinal sides extend parallel with each other in opposite directions. The two modules are also misaligned with each other in the longitudinal direction so that the RF sections lie away from each other and so that connectors to which signals subject to noise interference are inputted lie away from each other.

Abstract: A base station which prevents the transmission of data between communicating nodes until the data communication rate required by the communicating nodes has been established selectively suppresses the confirmation tone that a receiving node sends to an originating node. The transmission of voice, facsimile or modem data is prevented until the communication path has been established at the desired communication rate. This permits the base station to reliably transport encoded data at a plurality of data rates without precise synchronization.

Abstract: A method implemented by a subscriber unit for suppressing selective communications during communication rate modification, wherein the subscriber unit is coupled between first and the second communicating nodes, includes establishing a communication channel between the first and the second nodes at a first data rate; detecting a transmission from the first node on the channel; determining whether the transmission requires a change in data rates to a second data rate; switching the communication channel to the second data rate; and blocking transmissions from the second node until the second communication rate has been established.

Abstract: A common channel communication method for a base station in a mobile communication system including common channels, each of which support at least two data rates. The method comprises determining a data rate of the common channel available in a common channel service state and a frame length serviceable at the determined data rate, transmitting a message including information about the determined data rate and frame length on a specific forward common channel before transmission; and upon receipt of an acknowledge message through a specific reverse common channel, setting a data rata and a frame length of the common channel to the determined values.

Abstract: A method implemented by a base station for suppressing selective communications during communication rate modification, wherein the base station is coupled between first and said second communicating nodes, includes establishing a communication channel between said first and said second nodes at a first data rate; detecting a transmission from the first node on the channel; determining whether the transmission requires a change in data rates to a second data rate; switching the communication channel to said second data rate; and blocking transmissions from the second node until the second communication rate has been established.

Abstract: A high-capacity switch for transferring variable-sized packets under rate control is described. The packets are divided in the switch into segments of predetermined equal size. The packets are reconstructed before egress from the switch. The switch serves traffic of different classes of service, but the class of service distinction is relevant only at the ingress or egress modules. The switch control is preferably centralized to facilitate effective sharing of the inner capacity of the switch. The control is based on modulating the ingress/egress rate according to traffic load, the central control being unaware of the class of service disposition of the traffic it controls. The advantage is a high capacity switch adapted to transfer variable-sized packets with guaranteed rate control.

Abstract: A method of and apparatus for identifying a signal transmitting source detects a switching of a signal on the reception side thereby to prevent a transmission error from occurring when a signal is switched. The apparatus for identifying a signal transmitting source comprises a transmitting source identifying code extracting circuit for extracting a transmitting source identifying code provided in a SDDI format header of a received signal, a preceding transmitting source identifying code holding circuit for detecting a change of the transmitting source identifying code, and a transmitting source identifying code comparing circuit for detecting a switching of a transmitted signal based on the transmitting source identifying code thus changed, thereby detecting a switching of the transmitting source.

Abstract: A network switch includes a plurality of receive ports for receiving addressed data packets and a plurality of transmit ports for forwarding the addressed data packets and is responsive to data in the packets for directing received packets to the transmit ports. The switch includes, with respect to at least one transmit port, a bandwidth controller for at least one selected packet type. The bandwidth controller diminishes an aggregate count in response to the sizes of packets of the one type destined for the transmit port and continually augments the aggregate count at a selectable rate. The switch compares the aggregate count with a threshold and initiates a discard of packets of the one type before they can be forwarded from the transmit port so as to limit the proportion of available bandwidth occupied by packet so of the one type with respect to the transmit port.

Abstract: A multiplexing/synchronization control section receives data (in which the ratio between fast data and interleave data is fixed) which are supplied from an upper layer device at a prespecified data rate, and separates the data into fast data and interleave data. An interleaving section executes interleaving to the interleave data. The fast data and the interleave data, whose data rates have been controlled by a fast data rate converter and an interleave data rate converter respectively, are supplied to a tone ordering section to be assigned to carriers of a symbol (frame). In the case where the amount of data which can be assigned to each NEXT symbol is larger than or equal to a “specific amount” which corresponds to the fixed data rate of the fast data supplied from the upper layer device, the tone ordering section assigns fast data of the “specific amount” to each symbol regardless of whether the symbol is a FEXT symbol or a NEXT symbol.

Abstract: A clock switching technique allows selecting an input clock signal from any number of clock sources. Multiplexed input clock signals are switched on the fly onto an internal clock line coupled to an output clock line. Clock glitches are allowed on the output clock line. A clock invalid signal is asserted synchronous with the internal clock line during the time clock glitches may potentially be generated. The clock invalid signal signifies that clock switching is in progress and can be used to reset circuits which use the output clock line preventing problems in those circuits typically caused by clock glitches during the period of output clock instability. The clock switching technique is independent of clock source frequency as well as the system clock frequency.

Abstract: The present invention increases the communication path switching control speed. A demultiplexing circuit 2a is provided at an input side of a time division switch 1 and converts a serial signal of an input high 20a of multiplexed 32 Kbps sub rate channels into serial signals of the input highway 21a and 22a of multiplexed 64 Kbps full rate channels. A multiplexing circuit 2b is provided at an output side of the time division switch and converts serial signals of the output highways 21b and 22b of multiplexed 64 Kbps full rate channels into a serial signal of the output highway 20b of multiplexed 32 Kbps sub rate channels.

Abstract: A switching system for switching data with rate conversion between a high speed bus and a low speed bus, comprising a double-buffered data memory having a read-only port and a write-only port, a plurality of registers and selectors for receiving and storing successive frames of data from one of either the high speed bus or low speed bus into the data memory via one of the write-only port or said read-only port, respectively; and a connection memory containing a plurality of entries each having a first bit indicating channel ON/OFF status, an additional plurality of bits identifying connection addresses for the received frames of data; and a further plurality of index bits for addressing and reading the data memory via the other one of the write-only port or read-only port in the event the first bit is set and thereafter outputting the data to the other one of the high speed bus or low speed bus.

Abstract: The present invention provides a method and system for providing media services in Voice over IP telephony. A switch is coupled between one or more audio sources and a network interface controller. The switch can be a packet switch or a cell switch.

Abstract: A frame based data communications network is interfaced to a synchronous digital hierarchy network via a plurality of frame based data port cards incorporated into a plurality of synchronous multiplexers. Each port card comprises a conventional frame based data port, a frame switch, a rate adapter means and a mapping means for mapping data frames into a plurality of SDH virtual containers. Frame based data is incorporated directly into a synchronous virtual container without encapsulation in an intermediate protocol. A number of topologies of a frame based data channel network are possible, overlaid on the underlying synchronous transport network, including an open loop topology, a ring mode topology, and a backhaul topology.

Abstract: A method and system for managing communication resources between nodes in a network, and more particularly to a dynamic distributed multi-channel time division multiple access (TDMA) slot assignment method is presented. The method and apparatus include a set of higher level heuristics that enable the wireless channel access scheme to address predetermined characteristics of the wireless channel access system. These predetermined heuristics include using bootstrap slots, adaptive broadcast cycles, channelized neighborhoods, standby slots, speculation slots, neighbor segregation, hard circuits, and soft circuits.

Abstract: An ATM switching system comprises a switch unit including a plurality of input ports and a plurality of output ports having the same cell transmission rate, and a multiplexer for multiplexing cell trains outputted from at least two output ports into a single cell train and outputting the cell train to a high-speed output line (and/or a demultiplexer for demultiplexing a cell train from an output port into a plurality of cell trains and outputting the cell trains to a plurality of low-speed output lines). The switch unit includes a buffer memory for temporarily storing cells inputted from the input ports while forming a queue chain for each output line to which each cell is to be outputted, a demultiplexer for distributing the cells read from the buffer memory among the output ports in circulation, and a buffer memory control circuit for controlling the write and read operation of cells with the shared buffer memory.

Abstract: A method for communicating information in a communication network having a first high speed device, a second high speed device, and a low speed device includes transferring data between the first high speed device and the second high speed device at a first rate and transferring data between the first high speed device and the low speed device at a second rate different from the first rate. Transferring data between the first high speed device and the low speed device at a second rate different from the first rate includes receiving at the first rate, at a buffer system, data from the first high speed device and transmitting at the second rate, to the low speed device, data from the buffer system. Transferring data between the first high speed device and the low speed device at a second rate different from the first rate also includes receiving at the second rate, at the buffer system, data from the low speed device and transmitting at the first rate, to the high speed device, data from the buffer system.