scope:

Scope, Purpose, and Application

This standard applies to circuit-switched digital services, and provides and defines the performance parameters and measurements needed by users, vendors, and providers of circuit-switched digital services, to characterize the user-observable performance of these services (i.e., it does not address the causes of errors). It also includes parameters to be considered in determining whether or not a service is in the available or unavailable state. A given service will only reference those parameters or thresholds applicable to that service. The network-specific parameters are for performance allocation and network control. Standard performance parameter definitions and measurements are provided to ensure an understanding of: measured performance values, performance allocation among network elements, and compatibility of performance measurements among network users, providers, and equipment vendors.

This document provides framework information for T1.517-1995 (R2001), Integrated services digital network (ISDN) - Performance parameters and objectives,which contains numerical specifications and allocations for the parameters and measurements discussed in this standard. The service objectives specified in this companion document will be based on measurements made during the available state (i.e., measurements made during the unavailable state will be excluded from performance calculations) and are applicable to both directions of transmission.