Framework for Availability Characterization by Analyzing Outage Durations

摘要

Telecommunications service providers that maintain their own networks tend to be very good at diagnosing and repairing equipment failures. Careful analysis of service providers' own trouble ticket data can reveal actual failure rates, failure modes, failure footprints, and outage duration information. As trouble tickets inherently include both small capacity-loss events and fast switchover—which may ordinarily be excluded from TL9000 calculations— as well as planned/scheduled downtime, this offers a holistic view of product availability. This paper presents a taxonomy for analyzing these downtime events and guidance on both extracting salient product attributes from the data and on using the data to calibrate both unplanned and planned downtime models.