Data transmission system and method having improved alarm inhibiting function
First Claim
1. A data transmission system comprising:
- a subscriber line;
a first terminating unit for terminating said subscriber line at a first end of said subscriber line, said first terminating unit being connected to a public telecommunication network;
a second terminating unit for terminating said subscriber line at a second end of said subscriber line, a terminal equipment being connected to said second terminating unit;
alarm generating means at said first end of said subscriber line for generating an alarm input indicative of a trouble condition of said subscriber line and said second terminating unit;
monitoring means for monitoring said subscriber line and said second terminating unit; and
alarm controlling means, coupled to said alarm generating means and said monitoring means, for examining a result of monitoring by said monitoring means and for controlling whether or not said alarm input generated by said alarm generating means is canceled, according to a result of said examining.
1 Assignment
0 Petitions
Accused Products
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.
13 Citations
26 Claims
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1. A data transmission system comprising:
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a subscriber line; a first terminating unit for terminating said subscriber line at a first end of said subscriber line, said first terminating unit being connected to a public telecommunication network; a second terminating unit for terminating said subscriber line at a second end of said subscriber line, a terminal equipment being connected to said second terminating unit; alarm generating means at said first end of said subscriber line for generating an alarm input indicative of a trouble condition of said subscriber line and said second terminating unit; monitoring means for monitoring said subscriber line and said second terminating unit; and alarm controlling means, coupled to said alarm generating means and said monitoring means, for examining a result of monitoring by said monitoring means and for controlling whether or not said alarm input generated by said alarm generating means is canceled, according to a result of said examining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 22, 23)
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11. A data transmission method comprising the steps of:
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a) generating an alarm input indicative of a trouble condition of a subscriber line, terminated at one end by a first terminating unit and at the other end by a second terminating unit, and said second terminating unit; connecting said first terminating unit with a public telecommunication network; and connecting said second terminating unit with a terminal equipment; b) monitoring, at said first terminating unit, said subscriber line and said second terminating unit; c) examining a result of said monitoring step b); and d) controlling, according to a result of said examining, issuance of said alarm input indicative of a trouble condition of said subscriber line and said second terminating unit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 24, 25, 26)
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Specification