Historical
ANSI T1.223-1997
Structure and Representation of Network Channel (NC) and Network Channel Interface (NCI) Codes for the North American Telecommunication System
This standard provides the specifications and characteristics of Network Channel (NC) and Network Channel Interface (NCI) codes. This standard contains clauses covering its purpose, scope, code structures, data element descriptions, and data element applications.
Alliance For Telecommunications Industry Solutions [atis]