This module contains the definitions for statistics collected for OAM Performance Monitoring. The definition and requirement for these statistics are found in GR-1248-CORE. In addition, Cell Loss Ratio has been added as part of the Newbridge extension. This MIB module contains the following tables: OAM PM 15 Minute Current Table OAM PM 15 Minute Interval Table OAM PM 24 Hour Current Table OAM PM 24 Hour Interval Table These tables are heavily influenced by the definition of VPL/VCL described in rfc1695. The number of intervals supported is dependent upon resource availibility on any given product, but should nominally be 32 for 15 Minute intervals and 2 for 24 Hour intervals. To avoid building in massive amounts of storage, some products may adopt a bulk collection scheme. Intervals: Statistics on the performance of VPL/VCLs are collected over a historical stratum of up to a maximum of M intervals. The value of M is a function of a product's storage capability. For example, on the 36170 product, M = 32 for 15 Minute interval. The 15 Minute intervals are aligned to the quarter of one hour of a wall clock. The current interval spans back to the last 15 minute tick on the wall clock. Continuing along the timeline from that point is the most recently completed interval and has an index of 1. The previous interval has an index of 2 and so on. Note that the oldest interval may be incomplete since the statistic collection may have been enabled offset to the quarter or one hour tick. t 0 -1i -2i -3i ===========|===========|===========|===========|=========== current N = 1 N = 2 N = 3 N = 4 ... N = M interval Performance Monitoring Demarcation Values: As defined in GR-1248-CORE, three demarcation values are defined to evaluate the condition of a PM cell block. These are M errored, M lost and M misinserted. These values are configurable on a system-wide basis. Where applicable, the definition of a statistics object in this module will refer to one or more of these values.