Telecommunications Components

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