Installation manual

3
Notices
Government Requirements and Equipment Return
For regulatory approval, refer to the product labeling or contact your local AT&T Paradyne representative.
For the 3900 Series standalone modems, the Universal Service Order Code (USOC) for Permissive mode is
RJ11C. The Canadian equivalent to RJ11C is CA11A. For 3900 Series carrier-mounted modems, the USOC for
Permissive mode is RJ21X. The Canadian equivalent to RJ21X is CA21A.
Certain governments require that instructions pertaining to modem connection to the public switched telephone
network be included in the installation document. Specific instructions are listed in the following sections.
United States
NOTICE TO USERS OF THE PUBLIC SWITCHED TELEPHONE NETWORK
1. This equipment complies with Part 68 of the FCC rules. On the equipment is a label that contains,
among other information, the FCC registration number and ringer equivalence number (REN) for this
equipment. The label is located on the bottom of the Model 3920Plus modem. This label is located on the
Model 3921Plus modem’s circuit card assembly. If requested, this information must be provided to the
telephone company.
2. An FCC compliant telephone cord and modular plug is provided with this equipment. This equipment is
designed to be connected to the telephone network or premises wiring using a compatible modular jack
which is Part 68 compliant. See Installation Instructions for details.