Patent US5602828A successfully refreshed from Google Patents.
US5602828A
Expired / Lapsed
US
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Protect path switching in a performance monitoring and test system
Assignee: Viavi Solutions Inc
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Filing: 1995-05-26
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Granted: 1997-02-11
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Expires: 2015-05-26
Abstract
Abstract A DS3 level access, monitor and test system for a telephone network. The system provides selective, and hitless, bit overwrite in any of the embedded DS1, DS0 and subrate channels in a DS3 signal. Multiple DS0 and subrate channels can be tested via the asynchronous time slot interchange in conjunction with the recombiner of the present invention. The present invention further includes a lookahead reframer for framing to the DS3 signal. The present invention also includes a facilities data link (FDL) handler for capturing the FDL channel data in every DS1 channel in a DS3 signal. A high speed bit-for-bit compare is interfaced to a protect path to provide 1:1 fault protection in the system of the present invention. Full time performance monitoring on DS1 and DS3 signals is performed by a shared resource. The system of the present invention provides an integrated approach to synchronization measurement and relative synchronization.
Inventors
- 👤 Thomas L. Engdahl
- 👤 Paul R. Hartmann
- 👤 Kevin Pope
- 👤 Kevin Cadieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:28
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/062; H04J3/0623; H04J3/0602; H04J3/0605; H04J3/0608; H04J3/14; H04M; H04M3/00; H04M3/22; H04M3/24; H04M3/244
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
In a telephone network, a method of switching an input digital signal between a plurality of processors, wherein each processor includes a normal path and a protect path, the method comprising the steps of: comparing the input digital signal, received from the telephone network, bit-for-bit against a first output digital signal from a first processor; comparing the input digital signal bit-for-bit against a second output digital signal from a second processor; and switching the input digital signal from the normal path in the first processor to the protect path in the second processor.
Claim 2
Dependent Claim
93 words
In a telephone network, a method of switching an input digital signal between a plurality of processors, wherein each processor includes a normal path and a protect path, the method comprising the steps of: comparing the input digital signal, received from the telephone network, bit-for-bit against a first output digital signal from a first processor; comparing the input digital signal bit-for-bit against a second output digital signal from a second processor; and switching the input digital signal from the normal path in the first processor to the protect path in the second processor.
Claim 3
Dependent Claim
14 words
The method defined in claim 1, wherein the switching is performed without signal reframing.
Claim 4
Dependent Claim
19 words
The method defined in claim 1, wherein the switching does not change the value of more than three bits.
Claim 5
Dependent Claim
101 words
In a telephone network, an apparatus for switching an input digital signal between a plurality of processors, wherein each processor includes a normal path and a protect path, the apparatus comprising: first means for comparing the input digital signal, indicative of a signal in the telephone network, bit-for-bit against a first output digital signal from a first processor; second means for comparing the input digital signal bit-for-bit against a second output digital signal from a second processor; and means for switching the input digital signal from the normal path in the first processor to the protect path in the second processor.
Claim 6
Dependent Claim
101 words
In a telephone network, an apparatus for switching an input digital signal between a plurality of processors, wherein each processor includes a normal path and a protect path, the apparatus comprising: first means for comparing the input digital signal, indicative of a signal in the telephone network, bit-for-bit against a first output digital signal from a first processor; second means for comparing the input digital signal bit-for-bit against a second output digital signal from a second processor; and means for switching the input digital signal from the normal path in the first processor to the protect path in the second processor.
Claim 7
Dependent Claim
56 words
The apparatus defined in claim 4, wherein the means for switching comprises a normally closed relay in the normal path, a normally open relay in the protect path, and means for selectively energizing the normally closed relay and the normally open relay to switch the input digital signal from the normal path to the protect path.
Claim 8
Dependent Claim
14 words
The apparatus defined in claim 4, wherein the switching is performed without signal reframing.
Claim 9
Dependent Claim
19 words
The apparatus defined in claim 4, wherein the switching does not change the value of more than three bits.
Claim 10
Dependent Claim
211 words
In a telephone network, a system for protecting first and second input signals being accessed and output, comprising: a first access module receiving the first input signal including: a normal path circuit providing access of the first input signal for a set of performance monitoring and test functions and outputting the accessed first signal to the telephone network, a protect path circuit providing a path for the second input signal and outputting the second signal to the telephone network, a normal path switch for the first output signal, and a protect path switch for the second output signal; a second access module receiving the second input signal including: a normal path circuit providing access of the second input signal for a set of performance monitoring and test functions and outputting the accessed second signal to the telephone network, a protect path circuit providing a path for the first input signal and outputting the first signal to the telephone network, a normal path switch for the second output signal, and a protect path switch for the first output signal; a monitor module selectively receiving said input signals and said output signals and setting said switches to a predefined configuration when a fault is detected in any one of the normal path outputs.
Claim 11
Dependent Claim
211 words
In a telephone network, a system for protecting first and second input signals being accessed and output, comprising: a first access module receiving the first input signal including: a normal path circuit providing access of the first input signal for a set of performance monitoring and test functions and outputting the accessed first signal to the telephone network, a protect path circuit providing a path for the second input signal and outputting the second signal to the telephone network, a normal path switch for the first output signal, and a protect path switch for the second output signal; a second access module receiving the second input signal including: a normal path circuit providing access of the second input signal for a set of performance monitoring and test functions and outputting the accessed second signal to the telephone network, a protect path circuit providing a path for the first input signal and outputting the first signal to the telephone network, a normal path switch for the second output signal, and a protect path switch for the first output signal; a monitor module selectively receiving said input signals and said output signals and setting said switches to a predefined configuration when a fault is detected in any one of the normal path outputs.
Claim 12
Dependent Claim
13 words
The system of claim 8, wherein each input signal is a DS3 signal.
Claim 13
Dependent Claim
16 words
The system of claim 9, wherein the performance monitoring functions include DS3, DS2 and DS1 statistics.
Claim 14
Dependent Claim
36 words
The system of claim 9, wherein the testing functions include extracting a portion of a DS1 or DS0 channel from the input signal and replacing the extracted portion with another signal portion in the output signal.
Claim 15
Dependent Claim
14 words
The system of claim 8, wherein the protect path circuit is a channel repeater.
Claim 16
Dependent Claim
19 words
The system of claim 8, wherein the monitor module compares the input signal against the normal data path output.
Claim 17
Dependent Claim
18 words
The system of claim 8, wherein the monitor module compares the input signal against the protect path output.
Claim 18
Dependent Claim
14 words
The method of claim 1, wherein the input digital signal comprises a DS3 signal.
Claim 19
Dependent Claim
14 words
The apparatus of claim 4, wherein the input digital signal comprises a DS3 signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |