API (Application Program Interface, aka Application Programming Interface)

1. A set of rou-

tines by which an application program can call specific programs or services of a computer operating system (OS) or network operating system (NOS). See also application, NOS, OS, and routine. 2. A set of routines by which an application program allows another application program to work directly with it. See also application, program, and routine.

• single-key encryption
• single-line digital subscriber line (SDSL)
• single-line DSL (SDSL)
• single-mode fiber (SMF)
• single number dialing
• single number dialing
• single number dialing
• Single Point of Termination (SPOT)
• single sideband (SS or SSB)
• sink
• S interface
• sintering
• sinusoidal waveform
• SiO
• SIPO (serial-in, parallel-out)
• SIP (Session Initiation Protocol)
• site–local address
• skills-based routing
• skin effect
• skip
• Skipjack
• skywave
• SLA (Service Level Agreement)
• SLC
• SLC-96 (Subscriber Line Carrier-96)