Abstract: A communication system supports multiple source coding/channel coding schemes. A mode indicator can be transmitted with payload data to inform the receiver of the particular scheme currently being employed. Similarly, a mode request can be transmitted to inform the receiver of a particular scheme to be employed for information to be transmitted on the return radio link. The rate of change of the mode indications and mode requests can be decimated so that they need not both be transmitted in each frame to thereby reduce the overhead capacity consumption associated with the transmission of mode information. According to one exemplary embodiment, the mode indication and the mode request can be transmitted independently on alternating frames.

Abstract: A network switch for network communications, wherein the network switch includes at least one data port interface supporting a plurality of data ports transmitting and receiving data at a first data rate and a second data rate. The at least one data port interface includes an ingress logic circuit in communication with the at least one data port interface for generating at least one of an ingress address resolution and a filtering search request. A CPU interface is provided and configured to communicate with a CPU. A shared hierarchical memory structure including an internal memory in communication with the at least one data port interface, and an external memory in communication with a memory management unit via an external memory interface is provided. A communication channel is provided for communicating data between the at least one data port interface, the internal memory, the CPU interface, and the memory management unit.

Abstract: A method for consolidating backward resource management (BRM) cells in an available bit rate point-to-multipoint tree including a root, a plurality of leaves and a branch point interconnected between the root and the leaves. Initially, congestion information memory devices are reset. Then for each incoming return BRM cell to the branch point a determination is made whether the branch point has received a return BRM cell from a predetermined number of candidates in a candidate set of candidate-branches. If the branch point has not received a return BRM cell from the predetermined number of candidates in the candidate set then the congestion information from the incoming return BRM cell and the congestion information in the congestion information memory devices are consolidated in the congestion information memory devices.

Abstract: A communication scheme capable of guaranteeing the order of packets in the communication media exchange during the communication so as to be able to continue the communication smoothly even after the communication media exchange is disclosed. The source host transmits a first check packet through the first communication path and stops transmission of user data packets upon transmitting the first check packet, while the destination host transmits the first check packet through the second communication path upon receiving the first check packet through the first communication path while transmitting a second check packet through the first communication path, and stops transmission of user data packets upon transmitting the second check packet.

Abstract: A method and system for allowing multiple local simple communication buses to be selectively and separately connected as part of a larger, global communication bus. This interconnection is done transparently to the local buses, which may continue to operate autonomously and employ readily available and low cost devices based on time division multiplexing (TDM) protocol. A number of such TDM local buses are each provided with a switching device. A global bus and controller connects to each of the local bus switching devices. By uniquely addressing each switching device, the global controller can receive and transmit on any selected local bus, and issue commands to specific devices thereon. In a rapid fault polling mode, each local bus switching device is commanded to check its local bus devices for fault codes, and signal the presence thereof to the global controller, which can then access the local bus(es) which have the faults.

Abstract: Provided is a 10/100Base-T MAC to PHY interface requiring only two wires (pins) per port, with two additional global wires: a clock wire (pin), and a synchronization wire (pin). This reduction in the number of pins associated with each port is achieved by time-division multiplexing wherein each time-division multiplexed wire combines a plurality of definitions from the conventional 100Base-T interface specified by IEEE 802.3u (clause 22). As a result, each port has its own pair of associated time-division multiplexed wires (pins) and the addition of each port simply requires two additional wires. According to a preferred embodiment of the present invention, information normally transferred on sixteen wires in a conventional 100Base-T interface at 25 MHz is time-division multiplexed onto two wires (corresponding to two pins) that transfer data at 125 MHz, five times the speed of conventional interfaces. Importantly, this multiplexing is done on a port by port basis.

Abstract: A Digital-Subscriber Line (DSL) modem dynamically allocates its bandwidth to voice calls or data traffic as needed. Low-level frames are divided into several 64-Kbit/sec timeslots, each able to carry one voice call. These low-level frames are repeated several times in a 1-KHz frame that is synchronized to network timing references such as an 8-KHz clock used by the telephone network's pulse-code-modulated (PCM) highway. The 1-KHz frames are grouped into superframes. The low-level timeslots are allocated to either voice channels or to unchannelized data, depending on the number of voice calls currently being made. Allocations are made once for each superframe. The allocations or assignment of each of the timeslots to either voice or data is determined and sent to the remote modem or line card before the next superframe begins. When a good CRC occurs, the allocation sent is used to format the next superframe. Allocation bits for each of the timeslots indicate that the timeslot is for voice or for data.

Abstract: A system for detecting faults in fault detecting hardware designed to detect faults in a data flow comprising a fault generator for deliberately introducing faults in the data flow before it reaches the fault detecting hardware to establish a known background load of faults in the data flow. A fault counter counts actual faults including the deliberately introduced faults. Software analyzes a difference between the known and actual loads of faults.

Abstract: Congestion at a network node can be aggravated by having too many TCP connections. A simple method of avoiding the bad effects of too many TCP connections is to limit the number of connections. Limiting the number of connections is achieved by an admission control which delays or even discards the connection set-up packets. TCP traffic flows are monitored to generate packet loss characteristics and when a certain condition is met, a connection request queue is disabled.

Abstract: A Fault Tolerant Dial Router (FTDR) includes redundant subsystem resources that operate independently of telephone line interface connections. The redundant resources are switched active when a failure is detected in an activated dial router subsystem. Switching out subsystem failures is fully automated under software control, providing uninterrupted service to users with limited performance loss. The FTDR includes a switching mechanism that selectively switches out the telephone interfaces or other subsystem resources inside the dial router box detected as having failures. The subsystem resources include line framers, controllers and modem modules.

Abstract: A telecommunications system and method is disclosed for obtaining an accurate reverse-link Carrier-to-Interference (C/I) measurement for a Time Division Multiple Access (TDMA)-based system in a field environment. The field measurement is performed by using one time slot (voice channel) of one TDMA carrier for recording the carrier signal strength while two other time slots (two idle voice channels) are used in recording the co-channel or adjacent channel interference in a pseudo real time basis. Either the maximum interference or the average interference on the two additional time slots can be used to determine the C/I performance. Alternatively, only one additional time slot can be used to measure the interference. For example, if one of the additional time slots is busy, the interference can be measured on the other one of the additional time slots.

Abstract: A system for determining FEXT and ELFEXT of generic cabling systems provides accurate measurements of these parameters by determining and removing the effect of the connectors at the respective ends of the link, thereby giving measurement values that correspond to the defined link, rather than including the crosstalk contributions of the connectors, which can be substantial.

Abstract: An approach for selecting an asynchronous paging interval involves selecting a set of possible paging schemes for one wireless system; selecting a paging interval for another wireless system that is asynchronous with the paging schemes selected for the one wireless system; determining, after some number of paging repetitions, the probability of collision between a first paging channel in the one wireless system, and a second paging channel in the other wireless system; reselecting the paging interval for the other wireless system, asynchronous with the paging schemes selected for the one wireless system, and repeating the determining of the probability, until after some number of page repetitions, the probability reaches a prescribed minimum; and reselecting the paging interval for the other wireless system, asynchronous with the paging schemes selected for the one wireless system, and repeating the determining of the probability, until the number of paging repetitions needed to reach the prescribed minimum i

Abstract: A masked signal transceiver of the present invention comprises a transmitter for transmitting a combined signal of a primary communications signal and an attenuated secondary communications signal occupying substantially the same frequency band concurrently. A receiver receives the combined signal and demodulates the primary communications signal to extract the primary communications signal information. An adaptive locally optimum processor separates the secondary communications signal from the combined signal. The secondary communications signal is then demodulated to extract the secondary communications signal information.

Abstract: A system for intelligent C-plane switching in the digital enhanced cordless telecommunications (DECT) system. The present invention includes a system that enables fast C-plane transmission mode during cordless telephone voice connections within the digital enhanced cordless telecommunications (DECT) system without degrading the voice quality. In order to perform this fast C-plane transmission mode during voice connections, one embodiment of the present invention, located within a cordless telephone handset, utilizes a silence detector circuit to determine the periods of silence within the voice data transmitted through the U-plane. By determining the periods of silence within the U-plane voice data, the present invention is able to direct the control data to be transmitted through the fast C-plane during the periods of silence.

Abstract: A TDD digital radio communication system includes a local oscillator for generating a local oscillation frequency being N times the transmission intermediate frequency and a frequency divider for dividing the local oscillation frequency by N. The frequency divider is enabled in the transmission mode to generate the transmission intermediate frequency and is disabled in the reception mode to completely stop generating the transmission intermediate frequency, so as to prevent interference with the reception intermediate frequency.

Abstract: A message hub is provided for use in a message communication system having a plurality of nodes connected to the message hub by a data communication medium for inter-node messaging. The message hub operates in a scheduling phase and a transmission phase. In the scheduling phase, request receiving means receives a messaging request signal is received from each node. In accordance with the messaging request signal, selecting means selects a selected node in the scheduling phase. Granting means generates a grant signal to the selected node for allowing the selected node to transmit a message to the message hub on the data communication medium. The granting means also generates a listen signal to the other nodes for commanding the other nodes to listen to the data communication medium. The message hub enters in the transmission phase in which message receiving means receives a message transmitted from the selected node on the data communication medium.

Abstract: In a cellular system based on industry standard IS-95 CDMA (code division multiple access), a symbol error count based reverse link outer loop power control technique uses non-adaptive SER targets. In particular, a base station set a fixed target for a 2nd order statistic, e.g., standard deviation (variance), of the symbol error count as a function of a target frame error rate (FER). The base station monitors a symbol error count of a received signal (transmitted from a mobile station). This symbol error count is used to update an estimate of the standard deviation of the symbol error count. This estimate of the standard deviation of the symbol error count is compared with a target standard deviation of the symbol error count to make changes in the EbT/N0T target. The adjusted EbT/N0T target is used to provide power control.

Abstract: A rotary capping system services inkjet printheads in an inkjet printing mechanism. A rotary service station has a tumbler with a dual pivoting link that supports a cap platform. The cap platform is gimbal mounted to the link and spring-biased away from the tumbler. The platform has an extending arm that contacts the printhead carriage to align the cap and printhead. When the printhead is positioned for capping, rotation of the tumbler around an axis parallel to the printhead scanning direction brings the platform arm into contact with the carriage. Continued rotation of the tumbler pivots the link and the platform to sweep the cap through a non-linear, generally arcuate path into a capping position at the printhead. The illustrated cap has a multi-ridge lip for sealing over surface irregularities on the printhead nozzle face. A method of sealing inkjet printhead nozzles is also provided.

Abstract: An ink jet printing system to perform printing by ejecting ink toward a printing medium by employing a printing head having ink passages for ejecting ink through ejection openings and a common ink chamber supplying the ink into the ink passages.