This standard establishes criteria and procedures for evaluating the Resistance and Impedance performance of analog telephones and terminals connected to the Public Switched Telephone Network (PSTN). The recommended on-hook requirements are written with a model of five (5) Customer Premise Equipment (CPE) attached to the Customer Interface (CI) and the minimum performance requirements are based on a model of three (3) CPE.

This document proposes or references at least one measurement procedure for each technical requirement. However, these procedures are not exclusive. Any measurement procedure and equipment that can result in an identical measurement is considered valid.

While the procedures may call out specific test points within the requirements, the full range of the requirements take precedent over the test method.