ATIS (Alliance for Telecommunications Industry Solutions)

Formerly the Exchange Carriers

Standards Association (ECSA) A U.S. organization that develops and promotes technical and operations standards for the telecommunications and related information technology industries. ATIS standards activities address both wireless and wireline networks and include interconnection standards, number portability, improved data transmission, Internet telephony, toll-free access, telecom fraud, and order and billing issues. ATIS is accredited by the American National Standards Institute (ANSI). See also ANSI.

• Table R-1: Before and After: Bell Operating Companies (BOCs) and Regional Bell Operating
• Table R-2: Coaxial Cable Types
• Table S-1: SDTV Scanning Formats
• Table S-2: SONET/SDH Signal Hierarchy
• Table T-1: North American Digital Hierarchy: T-carrier
• Table T-2: TCP/IP Protocol Suite
• Table V-1: Electromagnetic Signal Propagation Velocity (Approximate)
• Table V-2: Vertical Redundancy Check (VRC)
• Table V-3: Selected ITU-T V-Series Recommendations
• Table W-1: ITU-T Transmission Windows
• Table X-1: DSL Technology Comparisons
• Table X-2: ITU-T X Series Recommendation Groups
• Table X-3: Select X Series Recommendations
• TACS (Total Access Communications System)
• Tagged Image File Format-Fax (TIFF-F)
• Tagged Image File Format (TIFF)
• tail circuit
• talk battery
• talk path
• tandem switch
• tap
• TAPI (Telephony Application Programming Interface)
• taps
• tariff
• TASI (Time-Assignment Speech Interpolation)