This module contains definitions for performance monitoring of the ATM layer and it's circuits. This MIB module contains the following tables: ATM VPL 15 Minute Current Table ATM VPL 15 Minute Interval Table ATM VPL 1 Hour Current Table ATM VPL 1 Hour Interval Table ATM VPL Stat Table ATM VPL Stat Counter Table ATM VCL 15 Minute Current Table ATM VCL 15 Minute Interval Table ATM VCL 1 Hour Current Table ATM VCL 1 Hour Interval Table ATM VCL Stat Table ATM VCL Stat Counter Table nncDepthOfHistoricalStrata These tables are heavily influenced by the definition of VPL/VCL described in rfc1695, and by the statistic table definitions described for Sonet in rfc1595. The number of intervals supported is dependent upon resource availibility on any given product, but should nominally be 32. 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. The intervals can be either 15 minutes or 1 hour and are aligned to the quarter or one hour, respectively, of a wall clock. The current interval spans back to the last 15 minute or 1 hour 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 Counters: The following is understood for each counter in this MIB: - OAM cells are included in counts - idle and unassigned cells are not counted - valid cells are those that have passed HEC and have assigned VPI/VCI - admitted cells have a connection This module also contains definitions for performance monitoring of Virtual Path Aggregation (VPA) - also known as VCC to VPC Traffic Aggregation - and implemented as Shaped Trunk Group. Only egress VPA statistics are provided. The following tables have been added : ATM VPA Short (15 minutes) Current Table ATM VPA Short (15 Minutes) Interval Table ATM VPA Long (1 Hour) Current Table ATM VPA Long (1 Hour) Interval Table Intervals: two 15-minute intervals are provided : current and previous two 1-hour intervals are provided : current and previous.