Abstract: The bit rate at which a digital wireless communications system communicates data in scattering environments may be significantly increased by using multiple antennas at both the transmitter and receiver and by decomposing the channel into m subchannels. In the same frequency band, m one dimensional signals are transmitted into a scattering environment which makes these transmitted signals appear spatially independent at the receive antenna array. The high bit rate is enabled by special receiver processing to maximize the minimum signal-to-noise ratio of the receiver detection process.

Abstract: A system is disclosed which services a plurality of queues associated with respective data connections such that the system guarantees data transfer rates and data transfer delays to the data connections. This is achieved by associating each connection having at least one data packet waiting in its associated queue (such a connection called a backlogged connection) with a timestamp generated as a function of system parameters including (a) the number of queues that are backlogged, (b) the data transfer rate guaranteed to each connection, (c) the sum of data transfer rates guaranteed to all backlogged connections, (d) the previous timestamp of the connection, and (e) the weighted sum of the timestamps of all backlogged connections, each timestamp weighted by the data transfer rate guaranteed to the corresponding connection.

Abstract: A back-up facility for data routers is enhanced by providing a mutual back-up feature which allows each of the routers to be active at the same time while also providing a standby monitoring function for the other router(s).

Abstract: A facility in a communication system associates a unique identification signal with each currently active communications channel and then transmits the unique identification signal and associated information signals within the respective channel. In this way, apparatus that receives the transmitted signals may determine the number of channels that are active based on the number of the identification signals it receives and then output the received signals at a power level determined as a function of that number.

Abstract: The reliability of supplying data stored in a plurality of different memories to different users is enhanced by (a) dividing each of the memories into primary and secondary sections, (b) partitioning the data into successive blocks and (c) storing the blocks of data in sequence in respective ones of the primary sections. Then storing in sequence the blocks of data that have been stored in the primary section of one of the memories in respective ones of the secondary sections of the other ones of said disks.

Abstract: A facility is provided in a data network to prevent a so-called connectionless broadcast message from flooding the network as a result of each network node retransmitting such messages to its neighboring nodes even though a neighboring node may have received them from another neighbor. Specifically, a node x that receives a connectionless broadcast message retransmits the message to a neighboring node y only when node x finds that it is closer to the source of the message than node y is including any other neighbor of node y.

Abstract: An arrangement is disclosed for allocating a constrained common resource among a plurality of demands for the resource. The arrangement includes generating a set of patterns as candidates for a recommended solution, setting goals or constraints for a pattern to meet before the pattern becomes a candidate for the recommended solution, searching the set of patterns and determining those patterns that meet the goals, and appending those patterns that meet the goals to the recommended solution. A random distribution based on the demand for the resource over a multi-dimension space can be generated. Responsive to the random distribution, a plurality of feasible patterns can be generated. Responsive to the feasible patterns, a multiplicity ratio may be generated. Responsive to a multiplicity ratio and to its corresponding feasible pattern, the plurality of feasible patterns may be reduced to a single feasible pattern, which can be included in the recommended solution.

Abstract: A facility is provided for use in a packet switch to control unnecessary multiple retransmissions of a data packet. In an exemplary embodiment of the invention, such control is achieved by tracking in a list the sequence numbers of transmitted data packets and retransmitting a data packet only if its sequence number appears in the list prior to the sequence number of the last data packet that is received correctly by a receiver. The sequence number associated with a retransmitted data packet is deleted from the list and then appended to the list to place the number in proper relationship with the sequence numbers of data packets transmitted after the initial transmission of the retransmitted data packet.

Abstract: A common adjunct switch integrated with a telecommunications network and associated with a plurality of predetermined telephone numbers prefixed by a common code is provided with a facility which allows telephone subscribers that are assigned respective ones of the telephone numbers to personalize the way in which they receive long distance telephone calls. For example, such a subscriber may program his/her associated service record to put into effect call forwarding or call screening. In addition, each such subscriber may be associated with one or more caller identification numbers, in which a caller identification number is used to determine whether a call placed to a service number is billed to the called subscriber or the calling party.

Abstract: A digital signal processor is provided with the facility to measure accurately, and nonintrusively, the levels of noise and/or speech signals appearing on an in-service network connection.

Abstract: A facility for establishing a signaling link over a telecommunications network connection formed by a number of network switches is provided so that an upstream switch may communicate with a downstream switch in the connection. The facility is particularly useful in controlling the number of times that signals traveling over the connection are subjected to a particular function.

Abstract: The quality of voice signals transmitted by a telephone station set, or similar device, are enhanced in accordance with the steps of the instant method before such signals are delivered to a receiving telephone station set by restoring the level of speech energy attenuated by the transmitting set, in which such restoration is performed at a point along a telephone connection between the transmitting and receiving telephone stations, for example, at a point within a telecommunications system which establishes the connection.

Abstract: A facility is provided for greatly enhancing the rate at which volumetric data is processed by display on a two-dimensional display. Specifically, the volumetric data is first divided into a predetermined number of sub-blocks, in which a predetermined voxel in each sub-block is then transformed into an associated picture element. The sub-blocks and their associated pixels are then supplied to respective processors forming an array of processors. Each processor then completes the transformation of its sub-block as a function of the coordinates of the associated picture element and respective incremental vectors.

Abstract: A restoration system is provided for enhancing the reliability of a telecommunications network such that particular traffic which is disrupted by, for example, a faulty link, may be quickly rerouted via an alternate route established "on the fly". In particular, each node and link forming the network is monitored, and in the event that such monitoring detects a faulty link or node then a central controller is notified. The controller is arranged to locate spare capacity and establish an alternate route, in which the continuity of the alternate route is confirmed before the disrupted traffic is transferred thereto.

Abstract: A facility is provided for measuring the signal-to-noise ratio of a transmission channel using the results obtained by transmitting over the channel a pseudorandom noise signal, in which the value of the signal-to-noise ratio may be used to determine whether the channel contains various types of pulse code modulation equipment.

Abstract: A facility is provided which obviates the need of administering network addresses in an internetwork composed of a plurality of networks by assigning to each network a common source address, rather than a unique network address. In addition, and when a connection is established between two of the networks, then, for the duration of the connection, each of those networks is dynamically associated with a respective second network address and a respective connection address, in which the connection address is used as a destination address. Accordingly, when one of the networks transmits a message to the other network, the internetwork identifies the proper connection as a function of the message destination address and then forwards the message to the intended recipient. In doing so, the internet changes the message source address to the second address associated with the one changes network and the message destination address to the second address associated with the other one of the two networks.

Abstract: A communications system that is arranged to transport so-called connection oriented messages via respective virtual circuit connections is enhanced so that it also transports so-called connectionless messages via a predefined virtual circuit connection that is common among those data modules which participate in the connectionless message service. In particular, each module which participates in the connectionless message service is assigned, in addition to a primary address that is used in conjunction with associated channels numbers to transport respective connection oriented messages, a common address and a channel number that is used solely for transporting connectionless messages. In this way, the communications system processes connectionless messages as though they were connection oriented messages.

Abstract: A facility is provided for automating dual party relay service so that the cost of such a service may be reduced. The desired result is achieved by automating particular features of dual party relay service to appreciably decrease the amount of time that a service attendant is involved in a dual party relay call. Such automation is obtained by employing text-to-speech processing, and, on a limited basis, automatic speech recognition.

Abstract: A facility is provided for generating from a series of parameters (factors) and their respective values (levels) inputted by a user a plurality of test cases using an orthogonal array selected from a library of such arrays, in which the selection is optimized by characterizing the arrays by respective cumulative level vectors and converting the user input into a cumulative level input vector. The smallest array for generating the test cases is then selected on the basis that the values of the input vector are no larger than the corresponding values of the cumulative level vector characterizing the selected array.

Abstract: A computer is provided with the facility to display in map form, directed data associated with respective nodes. The operation of the mapping facility is initiated in response to the user entering an appropriate command. Specifically, responsive to the command, the computer displays a plurality of symbols representing respective ones of the nodes such that those symbols which exchange data are connected to one another by a displayed link formed from two half-line segments each indicative of the direction and level of data associated with its respective symbol. In addition, a plurality of tools are displayed for controlling the parameters used in the display of the symbols and links. For example, the user is provided with the capability to change the length of the half-line segments, and is provided with the capability to erase from the display those segments representing data values which are not within a range of data thresholds established by the user operating a threshold tool.