RAUL FERNANDEZ
Pilots at 176 St, Miami, FL

4916692, Apr 10, 1990

Mar 14, 1988

7/167816

George A. Clarke - Sunrise FL
Juan E. Farias - Sunrise FL
Raul F. Fernandez - Miami FL
Dale R. Jenkins - Sunrise FL
Jon S. Miller - Pembroke Pines FL
Edward J. Sackman - Sunrise FL
Donald L. Wray - Lauderdale FL
Leroy D. Young - Cooper City FL

Racal Data Communications Inc. - Sunrise FL

H04J 324

370 851

An apparatus for controlling access to a time division multiplexed (TDM) bus includes a frame address register having a plurality of storage registers for storing a plurality of frame addresses designated for use in communicating over said TDM bus. A frame address latch stores a current frame address. A frame comparator, coupled to the frame address register and the frame address latch, compares the designated frame addresses with the current frame address and produces a first signal indicative of the storage register containing a frame address matching the current frame address. A time slot register has a plurality of storage registers for storing a time slot number designated for use in communicating over said TDM bus. A time slot generator generates a current time slot number. A time slot comparator, coupled to the time slot register and the time slot generator compares the designated time slot number with the current time slot number and produces a second signal indicative of the storage register containing a slot number matching the current time slot number.

4583236, Apr 15, 1986

Feb 5, 1985

6/698466

Philip F. Kromer - Chevy Chase MD
Rangarajan Srinivasagopalan - Miami FL
Raul F. Fernandez - Miami FL

Racal Data Communications Inc. - Miami FL

H04L 100, H04L 700

375 17

Disclosed is a modulation-demodulation system and method for transmitting a plurality of sequentially received information bit sequences, the system including a transmitter having a state machine for expanding by a coding process each information bit sequence into an expanded bit sequence with a coded bit group portion and, in some cases, an uncoded bit group portion. The transmitter further includes a modulator for modulating a carrier signal by one of a plurality of multilevel symbols in a two-dimensional complex plane in response to each sequentially applied expanded bit sequence, with the coded bit group portion being used to specify a subset of the multilevel symbols which when rotated in the complex plane maps upon another subset for each adverse angular rotation and the uncoded bit group portion being used to specify for a selected multiple symbol subset the transmitted multilevel symbol of the carrier signal. The system further includes a receiver having a demodulator and slicer for demodulating and detecting the modulated carrier signal to obtain the expanded bit sequences; a phase rotation detector, coupled to the slicer, for uniquely identifying each adverse angular rotation by analyzing a plurality of non-rotated and rotated sequentially received coded bit group portions; and a phase corrector, coupled to the phase rotation detector, for compensating for the adverse angular rotation.

4601044, Jul 15, 1986

Nov 4, 1983

6/548572

Philip F. Kromer - Winchester MA
Rangarajan Srinivasagopalan - Miami FL
Raul F. Fernandez - Miami FL

Racal Data Communications Inc. - Miami FL

H04L 100, H04L 700

375 17

Disclosed is a modulation-demodulation system and method for transmitting a plurality of sequentially received information bit sequences, the system including a transmitter having a state machine for expanding by a coding process each information bit sequence into an expanded bit sequence with a coded bit group portion and, in some cases, an uncoded bit group portion. The transmitter further includes a modulator for modulating a carrier signal by one of a plurality of multilevel symbols in a two-dimensional complex plane in response to each sequentially applied expanded bit sequence, with the coded bit group portion being used to specify a subset of the multilevel symbols which when rotated in the complex plane maps upon another subset for each adverse angular rotation and the uncoded bit group portion being used to specify for a selected multiple symbol subset the transmitted multilevel symbol of the carrier signal. The system further includes a receiver having a demodulator and slicer for demodulating and detecting the modulated carrier signal to obtain the expanded bit sequences; a phase rotation detector, coupled to the slicer, for uniquely identifying each adverse angular rotation by analyzing a plurality of sequentially applied coded bit group portions; and a phase corrector, coupled to the phase rotation detector, for compensating for the adverse angular rotation.

4893305, Jan 9, 1990

Mar 31, 1988

7/175871

Raul F. Fernandez - Miami FL
Ignacio Urbieta - Miami Lakes FL

Racal Data Communications Inc. - Sunrise FL

H04J 322, H04B 138, H04L 516

370 84

A multi-port (multiplexed) modem for implementing automatic reconfiguration of the ports so that transmission bandwidth can be optimized. The modem utilizes a sequence of communications and acknowledgments transmitted over the donor port donating the bandwidth and the recipient port receiving the bandwidth. This allows reconfiguration of the modem ports without need for interruption of the unaffected ports and requires no secondary channel to implement. Only the port going idle and the port receiving the bandwidth are affected so that communication channel throughput is maximized and unaffected ports are not interrupted.