PERFORMANCE MONITORING AND TEST SYSTEM FOR A TELEPHONE NETWORK

摘要

An access, monitor and test system (170) for a telephone network. The system (170) provides selective, and hitless, bit overwrite in any of the embedded channels, for example, DS1, DS0 and subrate, in a signal (134), for example, DS3. Multiple DS0 and subrate channels can be tested via the asynchronous time slot interchange (252) in conjunction with the recombiner (458) of the present invention. The present invention further includes a lookahead reframer (474) for framing to the DS3 signal (134). The present invention also includes a facilities data link (FDL) handler (254, 1068) for capturing the FDL channel data in every DS1 channel in a DS3 signal. A high speed bit-for-bit compare (470) 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. A portion of the relative synchronization method is the auto-search reference select sequence (1168). A portion of the system for correlating performance monitoring and testing of a channel is the alarm correlation and filter process (1270).