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Abstract: A fiber optics transceiver transmits and receives either synchronous or asynchronous data through a fiber optics data communication cable. The transceiver is connected to one end of the cable and communicates with an identical transceiver at the other end of the cable. The transceiver includes a transmitter for converting electrical digital data from a data source connected to the transmitter to optical flux for the cable. For asynchronous data, the flux comprises a train of positive-going pulses when the data is at a logical ONE, and a train of negaitve-going pulses when the data is at a logical ZERO. The train of pulses is interspaced at a fixed time interval and is restarted at each transition of the data between the logical ONE and logical ZERO state. For synchronous data, the flux comprises a train of positive-going pulses when the data is at a logical ONE, and a train of negative-going pulses when the data is at a logical ZERO. Each of the pulses in the train correspond to one transition of a clock waveform to which the data is synchronized. The transceiver also includes a receiver for converting optical flux from the cable to electrical digital data for data equipment connected to the receiver. For flux generated from asynchronous data, the receiver reconstructs the data. For flux generated from synchronous data, the receiver reconstructs both the data and the clock to which the data was synchronized. The transceiver also includes provisions for indicating the operationality of the data communications system formed by the two transceivers and the cable.
James F. Simmonds
Abstract: A portable test set is disclosed for rapid pair identification, polarity determination, and half-tap verification in conjunction with modular testing apparatus employed in splicing cables--particularly cables used in the telephone industry for interconnecting telephone switching systems and subscriber equipment. Switchable meters operating in combination as a single indicator are provided for determining individual line pair conditions prior to execution of simultaneous multiple pair splicing operations to prevent customer inconvenience or loss of service. The test set is adapted for mating with contemporary modular splicing equipment through the interface typically provided therein. The test set is particularly characterized by incorporating no internal power supply as is the usual case in such equipment but, rather, operating totally from voltages present in the cables under test.
James L. Cass
Abstract: A test apparatus for use with cables of the type used in telephone circuits comprising a plurality of two-wire conductive pairs exhibiting fixed resistance and capacitance per unit length. The apparatus can be used to locate a high resistance short involving two conductive wires. A precision a.c. signal or tone at a continuous, fixed frequency is applied to the wires. The phase angle resulting from the conductive and resistive portions of current flowing in the wires relative to the applied signal is determined. Current flow is sensed inductively and the presence of the conductive pair of interest is determined to be at those locations where the measured phase angle is substantially identical. In determining the location of a high resistance short, the current in the pair is sensed along its length and the point of the short is indicated as that point where the measured phase angle makes a substantial change. In the preferred embodiment, matched low-drift oscillator circuits are employed in the tone sending transmitter and the tone receiver. The two circuits are trimmed to be matched in frequency and phase prior to the beginning of the testing such that the two remain in sequence at least for the duration of the testing. The comparison of phase angle in the receiver is between the measured signal and the matched oscillator frequency.
Eugene M. Pester, III
Expert call analyzer and next generation telephony network configuration system.
Abstract: A method and apparatus for determining and monitoring the status of telephone calls in a Next Generation Telephony Network (NGTN) is disclosed. The method detects protocols occurring between two or more network elements of a telecommunication circuit and control protocol used to initiate or to react to the events generated by the network elements. One sensor is connected to the telecommunication circuits to sense raw call progress signaling information indicative of an event relative to the call on the monitored line. Another sensor is connected to call control channel of a NGTN network element. The sensors are connected to a call processing system. The call processing system includes a call progress event analyzer module consisting of a call progress event processor and a call progress state machine, a NGTN event processor and a NGTN state machine. The call processing system also includes a protocol independent call processor module and a multi protocol analysis module. Raw call progress signaling information and NGTN message information are converted to logical call handling events and forwarded to the protocol independent call processor module for processing. The protocol independent call processor module includes a timer processor to keep track of timing of events. The call processing system also includes an alarm handler to keep track and generate alarms when an error condition occur after processing the call progress events and the NGTN message events.