exchange

1. A central office exchange (CO or COE) of the public switched telephone network

(PSTN) and all of the equipment contained therein for the purpose of interconnecting (i.e., exchanging

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• Application Layer
• application processor (AP)
• application program interface (API)
• application programming interface (API)
• Applications
• application service provider (ASP)
• 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)