Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1987-04-29
1989-08-08
Ng, Jin F.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 40, 379 41, 379 51, 379106, 34082544, H04M 1100, H04M 1104
Patent
active
048560472
ABSTRACT:
A remote telemetry unit (RTU) for use in an automated telemetry paging system for providing remote pager notification of changes in selected operating parameters measured at a specific site location. The selected parameters and the unacceptable changes therein are provided in the form of a plurality of electrical status signals each representative of one of the selected parameters. The RTU includes a programmed microprocessor, including data input/output circuits, a memory circuit, a central processing unit (CPU) and a real time clock. The RTU also includes a status signal receiving circuit for receiving and electronically isolating and digitally shaping the received status signals. An interrogation circuit controlled by the CPU scans the digital status signals, and a discrimination circuit controlled by the CPU reads the digital status signals and determines if a valid deviated or changed status signal is present. If a valid change has occurred, a formatting circuit controlled by the CPU format a digital message to indicate the site location and codes for indicating the changed status or deviation of the monitored parameters. The digital status signals are transmitted to appropriate pager communications equipment for display in remote paging devices.
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Command Communications Inc. brochure for ASAP Alert & ASAP-45 paging systems.
Motorola, Inc. brochures for "People Finder" paging system.
BD Systems, Inc.
Kim David H.
Ng Jin F.
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