ISDN Integrated Services Digital Network
Private Branch Exchanges PBXs, Key Systems
Telcos AT&T, Bell Telephone, Sprint, Telus
DataPac & DataRoute Packet switching and analog switching WAN protocols
Cell Relay Digital packet switching WAN protocol
Frame Relay Digital packet switching WAN protocol
X.25 Analog packet switching WAN protocol
ATM Asynchronous Transfer Mode WAN protocol
World Wide Web Hypertext-based multimedia system
ADSL Asymmetrical Digital Subscriber Line
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