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US 5,726,993 AGranted
Signal detector for telephone line repeator remote loopback system
AssigneeSiemens Telecom Networks
InventorsKarl A. Kelsey, Romuald Bailey
Life of this patent
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Abstract
A loopback enabled by an instruction and address code pair transmitted with the regular data stream affords a simplified fault location scheme for a T1 repeater span. By selecting unique addresses for each repeater using a predetermined frame sequence and by testing for logic error density, erroneous enablement is avoided.
Claims19
A repeater having a unique address designation, wherein the repeater comprises:
- first detection means for detecting a first inchannel signal, the first inchannel signal being representative of an enabling command;
- enabling means, responsive to the first detection means, for enabling the detection of a second inchannel signal, the second inchannel signal being representative of the unique address designation;
- second detection means, responsive to the enabling means, for detecting the second inchannel signal;
- and
- means, responsive to the second detection means, for initiating a loopback.
2 more elements
A signal detector for a repeater having a unique address designation, comprising:
- first detection means, responsive to inchannel signals, for detecting a first inchannel code sequence, the first inchannel code sequence being representative of an enabling command;
- enabling means, responsive to the first detection means, for enabling the detection of a second inchannel code sequence, the second inchannel code sequence being representative of the unique address designation, where the means for enabling comprises
- means for determining whether the first inchannel code sequence is present for at least a predetermined interval of time;
- and
- means for determining the density of errors in the detected first inchannel code sequence;
- second detection means, responsive to the enabling means and inchannel signals, for detecting the second inchannel code sequence, where the second detection means comprises
- means for determining whether the second inchannel code sequence is detected within a predetermined interval of time;
- means for determining whether the second inchannel code sequence is present for at least a predetermined interval of time;
- and
- means for determining the density of errors in the detected second inchannel code sequence;
- means, responsive to the second detection means, for initiating a loopback;
- third detection means for detecting a third inchannel code sequence, the third inchannel code sequence being representative of a disabling command, where the third detection means comprises means for determining the density of errors in the detected third inchannel code sequence;
- and
- means, responsive to the third detection means, for disabling the loopback.
11 more elements
A method for initiating a loopback in a repeater in response to inchannel signals, where the repeater has a unique address designation, comprising the steps of:
- detecting a first inchannel signal, the first inchannel signal being representative of an enabling command;
- in response to the step of detecting a first inchannel signal, enabling the detection of a second inchannel signal, the second inchannel signal being representative of the unique address designation;
- in response to the step of enabling, detecting the second inchannel signal;
- and
- in response to the step of detecting the second inchannel, initiating a loopback.
2 more elements
A method of detecting signals for initiating a loopback in a repeater having a unique address designation, comprising:
- detecting a first inchannel code sequence, the first inchannel code sequence being representative of an enabling command;
- enabling the detection of a second inchannel code sequence, the second inchannel code sequence being representative of the unique address designation, where the step of enabling comprises the steps of
- determining whether the first inchannel code sequence is present for at least a predetermined interval of time;
- and
- determining the density of errors in the first inchannel detected code sequence;
- detecting the second inchannel code sequence, where the step of detecting the second inchannel code comprises the steps of
- determining whether the second inchannel code sequence is detected within a predetermined interval of time;
- determining whether the second inchannel code sequence is present for at least a predetermined interval of time;
- and
- determining the density of errors in the detected second inchannel code sequence;
- in response to the step of detecting the second inchannel code sequence, initiating a loopback;
- detecting a third inchannel code sequence, the third inchannel code sequence being representative of a disabling command, where the step of detecting a third inchannel code sequence comprises the step of determining the density of errors in the detected third inchannel code sequence;
- and
- disabling the loopback in response to the step of detecting a third inchannel code sequence.
11 more elements
A signal detector for a repeater having a unique address designation and being responsive to inchannel code sequences comprising wake-up, address, and loopdown codes, the signal processor comprising:
- code detection logic comprising
- wake-up code detection logic for detecting the wake-up code;
- address code detection logic for detecting the address code;
- and
- loopdown code detection logic for detecting the loopdown code;
- timing logic comprising
- a first timer for determining whether a detected inchannel code sequence is present for at least a predetermined interval of time;
- a second timer for determining whether the address code is received within a predetermined time interval;
- and
- a third timer for determining whether the duration of a loopback has exceeded a predetermined time interval;
- error density counter logic for determining the density of errors in a detected inchannel code sequence;
- and
- a state machine comprising
- first state means, responsive to the wake-up code detection logic, for enabling the first timer and the error density counter logic;
- second state means, responsive to the first state means, the first timer, and the error density counter logic, for enabling the second timer;
- third state means, responsive to the address code detection logic, the first and second timers, and the error density counter logic, for initiating a loopback and enabling the third timer;
- and
- fourth state means, responsive to the third timer, the loopdown code detection logic, and the error density counter logic, for disabling the loopback.
15 more elements
Dependencies are inferred from the claim text.