pdf 80 ATT PUB 4005 Jan80 - Technical Reference TELEPHONES - Functional Class Criteria Popular

The purpose of this Technical Reference is to provide standards containing the information necessary to design and manufacture telephones which are compatible with the Bell System telecommunications network and which will provide service capability consistent with Bell System quality of service objectives for telephone service.

This Technical Reference presents criteria which are the minimum necessary to determine if a telephone is technically suitable to be considered for standardization by the American Telephone and Telegraph Co. for use by the Bell Operating Companies. The information in this Technical Reference will be useful to anyone engaged in the manufacture of telephones intended for connection to Bell System facilities and/or equipment and to those purchasing, operating, or using such equipment.

Contributed by Steve Cichorsky. Processed by Remco Enthoven and Paul Fassbender.