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1991-12-30
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1.Proposed revision of Recommendation M.24 (new M.34)
INFORMATION FOR PERFORMANCE MONITORING ON
INTERNATIONAL TRANSMISSION SYSTEMS AND EQUIPMENT
The following text is proposed to replace the first alinea of 2.3.
The text under "2.3.1 Uses of performance monitoring data," and all
following text, remains unchanged.
"2.3 Monitoring strategies
In general, failures of equipment should be detected by continuous
automatic performance monitoring, as opposed to monitoring or testing involving
human intervention. This capability, however, implies that the performance
monitor feature is built into the digital terminal system, or dedicated external
performance monitor equipment is provided for each termination. An alternative
to providing dedicated external performance monitor equipment is to provide
remote access to protected monitor points and share external performance
monitoring equipment with a number of terminal systems. This alternative of shared,
but automatic monitoring is considered nearly continuous. Continuous (or nearly
continuous) monitoring is often made feasible by advances in technology, and
by virtue of the large number of circuits affected or jeopardized by a
transmission system failure. While continuous performance monitoring capabilities
built into transmission systems and terminals are clearly the preferred
implementation for new systems, the concept of nearly continuous monitoring offers an
efficient and cost effective means of providing automatic monitoring
capabilities for existing digital systems not having the built-in capabilities. In
addition, continuous (or nearly continuous) monitoring is faster, more reliable, and
less labour intensive than manual monitoring strategies."