Error indicator, and data modulator-demodulator and indicating m

Details Error indicator, and data modulator-demodulator and indicating m Error indicator, and data modulator-demodulator and indicating m

1997-10-02

2000-05-09

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375221, 375223, 370249, 379 5, 371 205, H04B 138, H04L 516

Patent

active

060613912

ABSTRACT:
An error indicator indicates plural errors with a light emitter. A MPU checks each section in a data modulator-demodulator, and flashes an error LED at a standard cycle when any error occurs. When an user turns ON an error check key in flashing at the standard cycle, the MPU varies a flashing cycle of the error LED in accordance with the detected error. Moreover, a light emitter in a data modulator-demodulator indicates whether a remote loop back test is executed by a trigger from a self-station or from other station. The MPU lights a test LED and shifts the data modulator-demodulator to an execution state when any switch is turned ON. When any of test switches except for local digital/analog loop back test is turned ON, the MPU transmits a test command corresponding to the test switch which is turned ON to other data modulator-demodulator. The other data modulator-demodulator flashes the test LED and is shifted to the execution state corresponding to the received command.

REFERENCES:
patent: 3920975 (1975-11-01), Bass
patent: 4351059 (1982-09-01), Gregoire et al.
patent: 4398297 (1983-08-01), Hwang et al.
patent: 4419756 (1983-12-01), Cheng-Quispe et al.
patent: 4926352 (1990-05-01), Staffe
patent: 5140625 (1992-08-01), Reum et al.
patent: 5148435 (1992-09-01), Ray, Jr. et al.
patent: 5224149 (1993-06-01), Garcia
WPI Abstract Accession No. 88-155746/198823 & DE 3639851.

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