Abstract: A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more, subcircuits on the substrate. Also included is a bias current supply coupled to the receiver and transmitter subsystems to provide bias current. The bias current supply includes a first bias circuit on the substrate coupled to, and to supply bias current to, a first subcircuit of the transmitter subsystem. The first bias circuit includes a first current modulator having a first switch input to indicate that the bias current is to start or stop being supplied to the first subcircuit. The first current modulator is to control the rate of change of supplied bias current in response to the first switch input. The first subcircuit may be a power amplifier. The control of the rate of change reduces oscillator pull in at least one oscillator included in the integrated circuit.

Abstract: A receiver transponder that is implemented in an optical add/drop multiplexer (OADM) is disclosed. The OADM is used in short haul type networks and receives light signals from two opposite directions on input fibers (21, 23). The optical input signals are converted to electrical signals by optical-to-electrical (O/E) converters (51, 53). The output terminals of the converters are connected to an electronic switch (61), which provides protection switching in a protected ring type network. The output signal of the switch can be monitored (65) before the signal enters a reshaping circuit (67), where the signal is reshaped, filtered from a supervisory channel, and adjusted to a proper drive level for a laser (69). The optical signal from the laser can travel a significant distance through a fiber (71) to a client receiver or sustain other forms of attenuation and still have sufficient signal power for reliable detection. An electrical output signal can be provided (73) by the reshaping circuit.

Abstract: A system for performing frame accurate bitstream splicing includes a first pre-buffer, a second pre-buffer, a seamless splicer, and a post-buffer. The system also includes a time stamp extractor, a time stamp adjuster, and a time stamp replacer for timing correction. The first and second pre-buffers are input buffers to the seamless splicer, and the post-buffer is coupled to the output of the seamless splicer. The seamless splicer receives the two streams via the first and second pre-buffers and produces a single spliced bitstream at its output in response to the cue tone signal. The seamless splicer provides the first bitstream, then re-encodes portions of the first and second bit streams proximate the splicing points (both the exit point and the entry point), and then switches to providing a second bitstream. The seamless splicer also performs rate conversion on the second stream as necessary to ensure decoder buffer compliance for the spliced bitstream.

Abstract: A method and apparatus for realizing a content addressable memory. The content addressable memory including an associative memory portion including N entries, each entry including a key and an M-bit type indicator. The content addressable memory further including a random access memory portion. The random access memory portion includes K*N entries where a single key stored as an entry in the associative memory portion is mapped to K entries in the random access memory portion, where K is greater than 1.

Abstract: Disclosed is a system and method for tracking, routing, and storing a number of digital documents in a call center. An example of an embodiment of the system includes a customer contact management server that is part of a network in a call center. The customer contact management server includes a processor coupled to a local interface and a memory coupled to the local interface. Stored on the memory is document tracking logic that is executed by the processor to perform the functions of tracking, routing and storing the digital documents. In one embodiment, the document tracking logic comprises contact management logic to generate a contact record associated with a digital document and to store the contact record on a contact database. The document tracking logic also includes resource management logic to identify a routing designation on the digital document, and scheduling logic to transmit the digital document to a destination based upon the routing designation.

Abstract: A computerized system and method for testing and analyzing problems with communications networks is disclosed. The system computerizes and automates the testing of such networks by providing a computer with interface software that can communicate with the variety of different test equipment that is currently available. The system automates process that was previously performed manually by an engineer or technician.

Abstract: The present invention relates to a system and method for canceling echoes from telecommunications networks by providing a multi-adaptation echo canceller. Unlike conventional TDM echo cancellers, the present invention uses at least two echo cancellers arranged in a novel manner to cancel echoes generated by a voice packet associated with an IP network or the like. The present invention further provides a double adaptation echo canceller that transfers coefficients from a first echo canceller to a second echo canceller. The present system compares the single and double adaptation echo error signals and selects the echo canceller with the smaller error signal. This process is continuously repeated so that the system can select the optimal echo canceller for canceling echoes for each voice block/packet. The present invention can be implemented with any number of echo cancellers so long as the each block or packet can be processed within a specified time frame.

Abstract: An operational amplifier for a pipeline analog-to-digital converter (ADC). The operational amplifier includes a cascaded chain of differential amplifiers, each differential amplifier including resistive-averaged common mode feedback to produce a common mode voltage for the differential amplifier, a particular differential amplifier of the chain having the highest gain of the gains of the differential amplifiers. The operational amplifier has one or more feedback paths each including a compensation capacitor to compensate the operational amplifier.

Abstract: A network device, for establishing communication between a first communication unit and a second communication unit through a packet switching network, includes a DSP array responsive to signals having coupled thereon voice, fax or data information for digitizing the information and converting the same to packets to form digitized packets of information.

Abstract: A fax system employed in a packet switching network environment for use by fax users for transmission of fax information includes a network device coupled, through a network interface, to one or more communications devices for transmitting a processed fax message through the network interface to one or more of the communications devices, each of the communications devices being capable of receiving fax information and having a predetermined minimum scan line time therefor.

Abstract: The invention is for a system and method for performing forward error correction on an MPEG-2 transport stream that has optional error correction information embedded within the sport stream. An error correction operation is performed on a super group of packets within the transport stream. The error correction data is inserted into a created trailer group of MPEG-2 compliant transport stream packets having no payload, but only an adaptation field The trailer group packets are optional and therefore can be discarded by a standard MPEG-2 decoder, but can also be used to recover data lost in the transmission of the transport stream. The invention results in a system and method to correct an MPEG-2 transport stream that can be used in any one of the digital video broadcast (DVB) formats, without the need for error correction decoders which are specific to the DVB format.

Abstract: A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.

Abstract: A communications system extends over a cellular region formed of a plurality of wireless cells where each cell covers a portion of the cellular region. Each cell has a base station clock unit that facilitates reliable and accurate synchronization with other clocks units in other cells using a master clock signal from a global positioning system (GPS) or other accurate frequency source. The clock unit in each cell includes a local clock providing a local clock signal for clocking the cell. A master clock source provides one or more master clock signals and a clock synchronizer receives the master clock signals and forms a synchronizing master clock signal for synchronizing the local clock signal. In one or more of the wireless cells of the communication system, the clock unit is a master clock unit which includes a clock distributor for distributing a distributed master clock signal to one or more other wireless cells having slave clock units.

Abstract: A system and method are provided for generating normalized events from nonstandard computer telephony interface (CTI) events generated by various private exchanges or telephone switches made by various manufacturers. In one embodiment, the system of the present invention includes a processor coupled to a local interface, a memory coupled to the local interface with normalization logic stored in the memory, the normalization logic being executed by the processor. The normalization logic generates a number of normalized events relative to the operation of a call center based upon non-standard CTI events received from the specific private exchange employed. In this regard, the normalization logic includes event normalization logic to generate at least one normalized event from a non-standard CTI event.

Abstract: The invention provides a method and system for routing information lookup for packets using routing protocols such as IP or IP multicast (IGMP), or MPLS (multiprotocol label switching, also known as tag switching or label switching) or MPLS multicast, in which both the destination address and the length of that destination address are matched using a lookup table having separate entries for selected addresses and their lengths, which can be accessed in parallel for multiple representations of destination addresses, and in which the input interface associated with the packet is included in the information used for matching.

Abstract: Apparatus and method for performing an equitable routing of calls within an automatic call distributor where calls are transferred to agent terminals from two sources, one controlled by switching equipment and the other controlled by a server. The server detects receipt of a call by a queue within the switching equipment and it determines whether other calls are waiting to be routed in the switching equipment. If other calls are waiting, the server withholds ready status of the agent terminals from the queue until the waiting calls are processed so that the switching equipment does not attempt to transfer calls from the source it controls, potentially conflicting with the waiting calls.

Abstract: A pipeline analog-to-digital converter (ADC) includes cascaded stages for resolving at least one bit of an analog voltage. Each stage has an analog input, one or more reference voltage inputs, and one or more digital outputs. The analog voltage is coupled to the analog input of the first stage. Each stage but the last has an analog output connected to the analog input of the next stage, and includes an operational amplifier that has one or more differential amplifiers having a common mode voltage. The pipeline ADC includes a reference generator to generate the one or more reference voltages for the stages. The reference generator includes a circuit to track the common mode voltage of the differential amplifiers such that the generated reference voltages are relative the common mode voltages of the differential amplifiers.

Abstract: The invention provides a method and system for auto-sensing LMI protocols in frame relay networks. When a router is first coupled to a frame relay network, it automatically configures the local management interface (LMI) to use one of a selected set of possible LMI protocols, by generating a set of protocol requests for a plurality of protocols, and by thereafter simultaneously listening for protocol responses from the configuration server. Multiple valid responses from the configuration server are assigned priority in response to which valid response is last to arrive.

Abstract: Method and apparatus for combining high data rate traffic and low data rate traffic on a common transmission medium while maximizing efficient use of available spectrum. Since spectrum is an economically valuable resource and transport of data generates revenue, the present invention directly leads to more profitable network operation. The disclosed systems are applicable to both wired and wireless transmission media. In one embodiment, a bandwidth reservation scheme provides that data rate may be varied so that when a particular data communication device is allocated a frame, it is also assigned a data rate for use in that frame. Because bandwidth usage varies with data rate, the division of available spectrum into channels for use by individual data communication devices may also vary among frames.

Abstract: A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.