fast busy signal

A signal indicating to the calling party that network resources are not available to

process the call. Synonymous with reorder tone. See also busy signal.

• application software
• application-specific integrated circuit (ASIC)
• appointment call
• APS (Automatic Protection Switching)
• aramid (aromatic polyamide)
• Archie
• architecture
• archiving
• ARCNET (Attached Resource Computer NETwork)
• area code
• area code
• area code
• ARIN (American Registry for Internet Numbers)
• arithmetic coding
• arithmetic logic unit (ALU)
• armored cable
• .arpa (address routing and parameter area)
• ARP (Address Resolution Protocol)
• ARPANET (Advanced Research Project Agency NETwork)
• ARPA protocol suite
• ARQ (Automatic Repeat reQuest)
• ARS (Automatic Route Selection)
• artifact
• AS (Autonomous System)
• ASCII (American Standard Code for Information Interchange)