Snap-On Tools Corporation

Motorola Corporation

Robert O Quinn

Craig F Govekar

Michael C Putrow

Gary D Jonker

Leonard J Wisneski, Jr

Gordon Lindhard

Dennis W Weidenbenner

James R Piehl

A method and apparatus of displaying performance metrics of a cellular communication system (50) having a call routing element (51), control elements (55, 56, 57, 58) and transceiver elements (59, 60, 61, 62, 63) provides for creating a hierarchical display (10) of the call routing element, the control elements and the plurality of transceiver elements with the call routing element depicted at a center of the hierarchical display and the control elements and transceiver elements radiating outwardly from the center in a hierarchical order. The user or the system selects a performance metric of one of the call routing element, the control elements and the transceiver elements, and the selected performance metric is displayed for each of the call routing element, the control element and the transceiver elements within the hierarchical display.

Method and apparatus for displaying performance metrics in a

During the handoff of a mobile unit (225) between a serving or source base-site (200) and a selected target base-site, (205 or 210) the target base-site (205 or 210) is directed to tune to and monitor the mobile unit's in progress call on a serving base-site channel frequency in order to verify target cell selection immediately before the handoff. Thereafter, the mobile unit (225) is directed to tune to a selected target base-site channel by the target base-site. Next, the target base-site (205 or 210) re-tunes itself to the selected target channel frequency and continues to transmit. Upon the arrival of the mobile unit onto the selected target channel, the serving base-site channel is released.

Communication transfer in a cellular radiotelephone system

A microprocessor controlled digital engine analyzer receives analog input signals from an engine being analyzed, engine parameter data entered via a keyboard, and function data, selecting one of several operating modes for the analyzer and which information is to be displayed, entered via the keyboard, and displays on a CRT screen the selected information such as cylinder firing order, RPM, Dwell, KV and DC volts, alphanumerically, information such as primary and secondary ignition and voltage, alternator and fuel injector information through the use of continuous waveform patterns, and additional information pertaining to Dwell, KV and Cylinder Shorting through the use of bar graphs. The waveform pattern data derived from the analog input signals is stored in a dual bank waveform memory and read out for display on the CRT screen under hardware control, and address data representing alphanumeric data and screen formats for the various operating modes to be displayed is stored in a dual bank display memory for application to a character generator, a bank switching arrangement being used for both the waveform memory and the display memory to enable the banks of each memory to be alternately written to and read from. A main microprocessor receives and processes analog input signals, other than the waveform pattern signals, and a display microprocessor receives numerical data from the main microprocessor and causes display of the numerical data on the CRT screen.

Digital engine analyzer

The apparatus comprises a combustion sensor to sense the combustion event in an engine, and a magnetic sensor to sense top dead center. Electrical signals from the sensors are converted to two trains of pulses which are applied to a microprocessor. Under the stored program, the microprocessor determines the time between pulses in one train and converts such time into engine speed in rpm. Also, the microprocessor determines degrees of rotation between corresponding pulses in the two trains. The offset angle, which is applied to a keyboard is subtracted from the degrees of rotation to provide the timing angle. The engine speed and timing angle appear in digital displays.

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Wheeling, IL, United States of America

Robert O Quinn