Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
201 words
A supervisory system for fault location during transmission of data in a digital data transmission system, the transmission system including a plurality of separate data transmission paths connecting two terminal stations with each transmission path incorporating a plurality of repeaters connected therein, and each repeater including at least one regenerator, and the supervisory system, which is provided in common to serve corresponding repeaters in separate transmission paths, comprises in combination; selection means including a selector and a plurality of remotely-controllable switch means for each transmission path, the selection means being controlled by at least one command signal from the terminal station at one or other of the ends of the transmission paths; an error detecting means for detecting the absence of an output from the regenerators, and when an error-rate-limit has been reached in respect of digital transmission code violations; separate supervisory path means provided for the transmission of interrogation and answer signals for determining the status of the error detector means; and the supervisory system being such that the selection means is controlled by an appropriate command signal to selectively operate one of the switch means to connect one of the data transmission paths exclusively to the error detecting means.
Claim 2
Dependent Claim
201 words
A supervisory system for fault location during transmission of data in a digital data transmission system, the transmission system including a plurality of separate data transmission paths connecting two terminal stations with each transmission path incorporating a plurality of repeaters connected therein, and each repeater including at least one regenerator, and the supervisory system, which is provided in common to serve corresponding repeaters in separate transmission paths, comprises in combination; selection means including a selector and a plurality of remotely-controllable switch means for each transmission path, the selection means being controlled by at least one command signal from the terminal station at one or other of the ends of the transmission paths; an error detecting means for detecting the absence of an output from the regenerators, and when an error-rate-limit has been reached in respect of digital transmission code violations; separate supervisory path means provided for the transmission of interrogation and answer signals for determining the status of the error detector means; and the supervisory system being such that the selection means is controlled by an appropriate command signal to selectively operate one of the switch means to connect one of the data transmission paths exclusively to the error detecting means.
Claim 3
Dependent Claim
64 words
A supervisory system, as claimed in claim 1 and further comprising in combination; pulse detector means for detecting dialling-pulses modulated on an audio frequency and embodied in the command signal which is transmitted over the separate supervisory path means; and the supervisory system also being such that the selector is stepped in accordance with the number of dialling-pulses received by the pulse detector means.
Claim 4
Dependent Claim
18 words
A supervisory system as claimed in claim 2 wherein each dialling pulse consists of two frequencies transmitted simultaneously.
Claim 5
Dependent Claim
111 words
A supervisory system as claimed in claim 1 and further comprising in combination; low pass and high pass filter means connected to each transmission path means and including a detector means connected to the low pass filter means; and the supervisory system being such that when the command signal in the form of an audio tone is received by the supervisory system, over a data transmission path, the appropriate low pass filter means and the detector means extract the audio tone to actuate the associated switch means, whereby data from the trnsmission path under test is extracted by the appropriate high pass filter means and applied to the error detection means.