[国外标准] NEMA WC 63.2-1996(R2003) Coaxial Premise Data Communications Cables
[国外标准] NEMA WC 63.1-2005 Performance Standard for Twisted Pair Premise Voice and Data Communications Cable
[国外标准] NEMA WC 57-2004 Standard for control, thermocouple extension, and instrumentation cables