Renewal method and apparatus for AU-4 and TU-3 pointers of synch

Details Renewal method and apparatus for AU-4 and TU-3 pointers of synch Renewal method and apparatus for AU-4 and TU-3 pointers of synch

1992-07-23

1994-07-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 84, 370102, 3701051, 370112, H04J 307

Patent

active

053316304

ABSTRACT:
Pointer renewal apparatus for AU-4 and TU-3 at an NNI of SDH recommended by CCITT, G707-G709. The apparatus comprises a retiming block 1 for input data, a pointer-detecting block 2 for the TU-3 pointer from input data, a pointer-analyzing block 4, a main memory block 6 for storing input data in a block frame of STM-1/3, a new pointer-generating block 8 which combines the AU-4 pointer and TU-3 pointer received into a new TU-3 pointer, a pointer-changing and output data block 7, and blocks which supply necessary pulses and signals such as extracting pulses for extracting the TU-3 pointer from the input data-block 3, generating frame-head signal pulses for the stored data-block 5, output timing pulses for the AU-4 pointer and TU-3 pointer-block 9, pulses and alarm signals indicating loss of a pointer and alarm indication signals AIS, and a read/write error-block 10.

REFERENCES:
patent: 4967405 (1990-10-01), Upp et al.
patent: 4998242 (1991-03-01), Upp
patent: 5040174 (1991-08-01), Takeuchi et al.
patent: 5123010 (1992-06-01), Pospischil
patent: 5168494 (1992-12-01), Mueller
patent: 5172376 (1992-12-01), Chopping et al.
CCITT Blue Book Recommendations, COM XVIII-R 33-E, revised Jun. 1990, pp. 18-100.

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