Abstract: Systems and methods are described for a load/store micropacket handling system. A method includes interconnecting a compute node with a shared memory node; translating a processor instruction into an interconnect command; transforming the interconnect command into a direct memory access interconnect command; transmitting the direct memory access interconnect command via a link medium; and performing an operation defined by the direct memory access interconnect command. An apparatus includes a computer network, including: a compute node, having: a compute node interconnect interface unit; and a compute node interconnect adapter; a link medium, coupled to the compute node; and a shared memory node, coupled to the link medium, having: a shared memory node interconnect interface unit; and a shared memory node interconnect adapter.

Abstract: A method and apparatus for using a memory adapter may allow a system to access the memory adapter. The memory adapter may comprise a list of entries for data within the memory adapter. Each entry may include an adapter memory segment offset, a segment length, a segment status, and a corresponding system memory address. The adapter memory segment offset may be the location of the offset within the memory adapter. A processor may access the adapter memory segment offsets through the system address space. The method and apparatus may be used to perform functions, such as read adapter memory, write adapter memory, insert adapter memory segment, remove an adapter memory segment, scan for an adapter memory segment, scan for a removable adapter memory segment, and potentially other functions.

Abstract: Systems and methods are described for a high availability shared memory system. A method includes A method, comprising: receiving an instruction to execute a system boot operation; executing the system boot operation using data resident in a primary shared memory node; and initializing a secondary shared memory node upon completion of the system boot operation.

Abstract: Systems and methods are described for a demand usable adapter memory access management. A method includes receiving a request to access a memory card address that lies outside a processor access range; scanning a data structure including a list of adapter memory segment offsets, each adapter memory segment offset associated with a memory adapter, for a suitable adapter memory segment offset; determining if a suitable adapter memory offset is available; converting the suitable adapter memory offset to a system address; and providing a processor with access to the suitable adapter memory offset via the system address.

Abstract: Systems and methods are described for a load/store micropacket handling system. A method includes interconnecting a compute node with a shared memory node; translating a processor instruction into an interconnect command; transforming the interconnect command into a direct memory access interconnect command; transmitting the direct memory access interconnect command via a link medium; and performing an operation defined by the direct memory access interconnect command. An apparatus includes a computer network, including: a compute node, having: a compute node interconnect interface unit; and a compute node interconnect adapter; a link medium, coupled to the compute node; and a shared memory node, coupled to the link medium, having: a shared memory node interconnect interface unit; and a shared memory node interconnect adapter.

Abstract: Automatic gain control in a digital signal processor. An incoming electrical signal is sampled and multiplied by a gain factor with the resulting product compared to a constantly changing maximum value. If the magnitude of the changing maximum value lies outside a predetermined range of values, then the gain factor is adjusted proportionally to the error calculated by the amount the maximum value is outside the threshold range. In an alternative embodiment, the gain is adjusted according to whether or not one of the resulting products lies outside such upper and lower threshold range. The running maximum value decays with time in order to allow the automatic gain control to rack a signal which slowly weakens in strength. A time dependent factor enables the gain to be adjusted much more radically when a signal is first received.

Abstract: This invention enables voice energy to be distinguished from energy due to other sources such as telephone call progress signals. A portion of the audio spectrum is divided into a high and into a low frequency band and the energy content of these bands is examined. The audio energy of a signal is passed through a set of filters and compared. A frequency boundary crossing of an input signal subsequent to filtering is used to signify the receipt of a voice signal. By operating in this manner, voice, whose predominant frequency switches in a random fashion from being greater than to less than a cutoff frequency, can be distinguished from other signals either below or above the cutoff frequencies of the filters. The detection of voice energy is not begun until a predetermined threshold of energy has been received for a specified period of time. This specified period of time need not be continuous after a ringback signal is received.

Abstract: Automatic gain control (AGC) is provided in a digital signal processor environment. A predetermined threshold value, a predetermined automatic gain control value, and a predetermined count threshold value are established and stored in a data memory associated with a signal processor. Each incoming signal sample that is received is multiplied by the AGC value with the product being temporarily stored in the data memory. The absolute value of the resulting product is taken and added to the predetermined threshold value. If the result of this operation results in a signal processor overflow, then the AGC value is reduced and stored back into the data memory. The adjustment period of the AGC value is chosen to be well under the allowable distortion time for speech, dual tone multi-frequency reception, and modem operation.

Abstract: A method and apparatus are described for phase and frequency locking a reference oscillator to an incoming modulated signal. The method and apparatus enable the carrier recovery of the incoming modulated signal. Phase and frequency locking devices are connected in feedback loops with a coherent detector that determine the amount of phase and frequency error between the reference oscillator of the coherent detector and the incoming modulated signal. The feedback loops correct such frequency and phase error so as to enable the reference oscillator to be in phase and frequency step with the modulated signal.

Abstract: A filter suppresses energy at time varying or ensemble varying frequencies. The filter comprises multiplier sections having sets of values which are dynamically varied during the receipt of time varying or ensemble varying energy. The variation of the values of the multiplier sections provides the suppression of energy at the time varying or ensemble varying frequencies. The sets of values for the multiplier sections are chosen such that the poles of such values lie within the unit circle of the z-plane locus. The location of the poles within the unit circle guarantees that the filter remain stable even though the multipliers may be located in a feedback path. In the preferred embodiment, the dynamically varying filter is used in a dual tone multi-frequency (DTMF) receiver.

Abstract: A starloop communication network for intraestablishment communication in a multiterminal processing system includes a digital switch as its central terminal. In the basic mode, the switch is configured so that the input from each terminal is switched back to the next terminal forming a loop network. A central processor in the network need only service the output of the first terminal on the loop and the input from the last terminal. The digital switch includes a port connected to monitor activity on the loop. In the event of a failure, the monitor can determine the failing terminal in the loop by use of a binary search around the loop. The failing terminal will be detected by the monitor and automatically isolated from the loop by the digital switch. The communication network may also be configured to include a plurality of terminal devices of equal performance and intelligence, i.e. a plurality of central processors.

Abstract: In a time division multiple access (TDMA) system, for "multi-path" data communication via satellite repeater, the form of transmitted data is varied adaptively to maintain error-free transmission under varying noise conditions. Adjustments are made on a path selective and channel selective basis to protect only the most vulnerable data in specific transmission paths experiencing noise deterioration. Accordingly any multi-channel burst may contain channels of data in both protected and unprotected forms. A predetermined portion of each channel containing data in unprotected format is used explicitly to designate the destination of the accompanying data and implicitly to distinguish the data format as unprotected. In protected format data including error protective coding is transmitted in two contiguous channels along with information in the first channel explicitly distinguishing the protected format.

Abstract: Modular digital exchange terminals linked in a network by earth satellite provide coordinated multiplex switching and activity compression between line circuits and satellite time division channels. The line circuits carry digital data and digitalized voice telephone information into and out of the network. Nodal access modules (NAU's) interface to the satellite radio equipment. Branch exchange modules (NCU's) link line circuits switchably to a nodal access module through time division channels of subsidiary digital communication links. In transit up-link (to satellite time division channels) information is switched between lines and NCU buffer stores (virtual channels), selectively assigned by activity compression to time channels on associated digital links (each link accommodating only a fraction of the virtual traffic capacity of the associated stores), and transmitted to the NAU.

Abstract: Digital exchange stations linked by earth satellite operate in a coordinately controllable time division switching and communication network system relative to externally attached telephone and data trunks. Modular switching equipment operating in coordination with satellite frames establishes and releases connection paths to trunk stores which interface with time and space domain channels of the system. Circuits through the system utilizing these paths are termed virtual connections because in different frames a circuit may be completed through different channels or even blocked under certain conditions. Telephone speech is converted between analog and digital forms relative to modular groups of 96 ports. Digital switching (slot interchange) equipment serving up to four groups (and cycling in coordination with satellite time division frames) cyclically completes local (intra-station) connections between ports and segments of toll (inter-station) connections between ports and locations in the trunk stores.

Abstract: Modular digital exchanges linked by earth satellite provide coordinated time division switching and time compressed communication services relative to externally attached telephone and data (user) trunks. Branch exchange modules (NCU's) perform call switching, buffer storage, time compression and activity selective channel assignment handling between individual external user trunks and multi-bit channels of external time division highways (digital links). The latter are linked pyramidally to time division multiple access nodes of the satellite through Network (Nodal) Access Unit modules (NAU's) which perform further time compression handling and adaptive assignment of satellite channels based upon nodal distribution of demand. The NCU modules also provide "local" switching between user trunks and "tandem" linkage directly between NCU's (without NAU and satellite handling).