| A | B |
| 1840 | year of the telegraph |
| 1876 | year of the telephone |
| data communications | transmission of data |
| telecommunications | transmission of audio, video, and graphical data |
| data communications network | computers and computer related devices that communicate with each other |
| source; sender | device that sends data; part of data comm. network |
| receiver | device that accepts data; part of data comm. network |
| medium | the physical path that connects the sender and receiver |
| 1984 | telephone systems were deregulated |
| common carriers | companies that provide telephone services |
| slamming | switched to a different long distance carrier without consent |
| interstate | telephone service between states |
| intrastate | telephone service within the state |
| online processing | processing done by means of networking |
| batch processing | processing done by walking it to a different computer; "sneaker network" |
| EFT | transferring of funds through a network electronically |
| ATM | computer terminal connected by a network that stores information about bank accounts |
| POS | cash register that is networked |