- CDM: Code Division Multiplexing
- Access Network and Technologies
- ATM: Asynchronous Transfer Mode Protocol
- Centrex: Central Office Exchange Service
- Core / Backbone Network and Technologies
- DWDM: Dense Wavelength Division Multiplex and Multiplexer
- Edge Network and Technologies
- EoS: Ethernet over SONET/SDH
- FDM: Frequency Division Multiplex and FDMA
- Fiber Optical Communication Network
- IAD: Integrated Access Device
- Intelligent Network (IN) and Advanced Intelligent Network (AIN)
- IP Centrex: IP telephony based Central Office Exchange Service
- IP-PBX: Private Branch Exchange using VoIP Technologies
- Network Convergence: Voice, Video and Data
- PBX: Private Branch Exchange
- PSTN: Public Switched Telephone Network
- SONET/SDH: Synchronous Optical Network and Synchronous Digital Hierarchy
- TDM: Time Division Multiplex and Multiplexer
- WDM: Wavelength Division Multiplex and Multiplexer
