Protect path switching in a performance monitoring and test system
First Claim
1. 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.
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Accused Products
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.
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Citations
16 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 15)
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4. 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:
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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. - View Dependent Claims (5, 6, 7, 16)
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8. In a telephone network, a system for protecting first and second input signals being accessed and output, comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification