"This document provides a minimal set of pass/fail performance parameters for non-loaded metallic loops that have been designed and maintained to primarily support basic voicegrade analog services such as Plain Old Telephone Services (POTS). The document specifies end-to-end performance tests as well as single-ended performance tests. The document defines the methods@ procedures@ and equipment to be used for each test@ and establishes the pass/fail criteria for each parameter being tested. Compliance with this technical requirements document should provide compatibility for basic voicegrade analog services in most cases@ but this document does not guarantee compatibility or acceptable performance for all services and technologies under all operating conditions. Tariffs@ contracts@ or regulatory acts in various jurisdictions may contain additional or more stringent requirements than those specified in this technical requirements document. In accordance with ANSI guidelines@ two categories of specifications are used in this document@ mandatory requirements and recommendations. Mandatory requirements are designated by the word ""shall"" and recommendations by the word ""should."""