ABSTRACT: GR-239, replaces TR-NWT-000239, Issue 2, December 1993, but contains NO TECHNICAL CHANGES from that original document. It has been issued strictly to conform with the new Telcordia Technologies document format and GR process, and carries a new issue number and date.

This GR presents the Telcordia view of the proposed generic requirements applicable to one-line, two-line, multiple-line, and retrofit indoor telephone Network Interface Devices (NIDs). The NIDs should be compatible with a Telcordia Client Company's telecommunications network and provide service capability consistent with typical Telcordia Client Company quality-of-service objectives for telephone service.

The information in the criteria may be useful to anyone engaged in the manufacture of indoor telephone NIDs intended for connection to Telcordia Client Company facilities and/or equipment and to anyone who may purchase, operate, or use such equipment. The criteria and illustrative test circuits are used to analyze equipment with respect to the following:

• Compliance with Federal Communications Commission (FCC), Code of Federal Regulations, Title 47, Part 68, Subpart F, "Connection of Terminating Equipment to the Telephone Network," Part 68, Subpart D, "Conditions for Registration", and Part 2, Subpart L, "Registration of Telephone Terminal Equipment."
• Compatibility with Telcordia Client Company facilities
• Potential safety hazards
• Performance characteristics
• Susceptibility to failure under normal and abnormal environmental conditions.