Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent
1994-08-29
1996-11-19
Chin, Wellington
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
With blocking of normal usage
379 1, 379 2, 379 10, 379 27, 379 29, 379 32, 379 33, 379 34, H04M 124, H04M 308, H04M 322
Patent
active
055770983
ABSTRACT:
A first terminating unit terminates a subscriber line at a first end of the line, the first terminating unit being connected to a public telecommunication network. A second terminating unit terminates the subscriber line at a second end of the line, a terminal equipment being connected to the second terminating unit. A monitoring device monitors at least the subscriber line and the second terminating unit and an alarm generating unit generates an alarm input concerning a condition of at least the subscriber line and the second terminating unit. An alarm controlling device examines a result of the monitoring by the monitoring device, the alarm controlling device controlling, according to a result of the examination, how the alarm input generated by the alarm generating unit is handled. A loop establishing device establishes a loop circuit in the subscriber line, and the monitoring device includes, a loop-current detecting device for detecting an electric current, the electric current flowing through the subscriber line if the loop circuit has been established. A terminal-equipment monitoring device detects whether or not the terminal equipment is being used, the loop establishing device establishing the loop circuit if the terminal-equipment monitoring device detects that the terminal equipment is being used.
REFERENCES:
patent: 4815120 (1989-03-01), Kosich
patent: 4819261 (1989-04-01), Takeda
patent: 4864598 (1989-09-01), Lynch
patent: 4969178 (1990-11-01), Chen
patent: 4996703 (1991-02-01), Gray
patent: 5029290 (1991-07-01), Parsons
patent: 5063563 (1991-11-01), Ikeda
patent: 5222119 (1993-06-01), Asano
patent: 5241579 (1993-08-01), Kim
patent: 5365568 (1994-11-01), Gilbert
Chin Wellington
Fujitsu Limited
Shankar Vijay
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