Relative synchronization system for a telephone network

Details Relative synchronization system for a telephone network Relative synchronization system for a telephone network

1993-11-23

1996-03-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701052, 379 1, 375357, 371 201, H04J 314

Patent

active

055008534

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, and also provides alarm correlation and hierarchical event filtering.

REFERENCES:
patent: 4967411 (1990-10-01), Grover
patent: 4993013 (1991-02-01), Shinada et al.
patent: 5117417 (1992-05-01), Danner
patent: 5138616 (1992-08-01), Wagner, Jr. et al.
Cowles, Calvin D., New Maintenance Strategies for Digital Facilities Networks, Proceedings of the National Communications; vol. 42, No. 2 (Sep. 30, 1988).

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