Information Systems – Interface between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for Operation with Packet-Switched Data Communications Networks (PSDN), or between Two DTEs, by Dedicated Circuit (NUI and NUI-Derived Fac
Specifies extensions that were considered important to have available in the U.S., prior to publication of the next full revision of the national standard. It addresses extensions related to the Network User Identification (NUI) Selection facility. Implementations conforming to this supplement must conform to X3.100:1989 and the 1988 version of CCITT Recommendation X.25. Supplement to ANSI X3.100-1989