X Series

The series of ITU-T Recommendations specifying protocols relating to data networks, open

systems communications, and security. See Table X-2 for selected X-series Recommendations by 100s group, and Table X-3 for specific recommendations of interest. For a full listing of ITU-T Recommendations, see the contact information in Appendix A.

• non-wireline carrier
• Nordic Mobile Telephone (NMT)
• Nordic Mobile Telephone (NMT)
• normal
• North American Numbering Council (NANC)
• North American Numbering Plan (NANP)
• North American Time Division Multiple Access (NA-TDMA)
• NOS (Network Operating System)
• notation
• Not To Act Like It)
• Novel Services)
• NPAC (Number Portability Administration Center)
• NPA (Numbering Plan Administration)
• N-PCS (Narrowband Personal Communications Services)
• NREN (National Research and Education Network)
• nrt
• nrt-VBR (non real-time Variable Bit Rate)
• NRZ (Non-Return-to-Zero)
• NSF (National Science Foundation)
• NT1 (Network Termination 1)
• NT1 (Network Termination 1)
• NT2 (Network Termination 2)
• NT2 (Network Termination 2)
• NTACS (Narrowband Total Access Communications System)
• NTIA