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TC 101: Exam 3
3rd Screen |
Cell Phone |
Bell vs. Gray |
Bell was credited with inventing the first practical telephone
There was a rush to the patent office, Bell won but was accused to stealing some of Gray's ideas |
Ma Bell & AT&T |
Ma Bell was the colloquial name for the Bell System
Named after Alexander Graham Bell
It was a conglomerate (mixture of different types of services); held a near complete monopoly over all telephone service in most areas of the country
AT&T is now new Bell System, owning 10 of the original 22 systems |
Social/Business Implications of Telephones |
Empowerment of women
Skyscrapers were now functional |
Ma Bell Demise |
FDR put them on his "bad list"
Great Depression |
Communications Act of 1934 |
Franklin D. Roosevelt
The Act replaced the Federal Radio Commission with the Federal Communications Commission (FCC)
combined and organized federal regulation of telephone, telegraph, and radio communications |
Common Carriers |
public communication services
FCC regulated |
1984 Antitrust Judgment |
Claimed AT&T was a monopoly
made to sell parts of their company |
Telecommunications act of 1996 |
primary goal was deregulation of the broadcasting market
said multiple mediums is okay ex. wireless, landline, internet
removing barriers of entry into the market |
Modems |
device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information |
DSL |
Digital subscriber line
provide internet access by transmitting digital data over the wires of a local telephone network |
FIber Optic |
transmitting information from one place to another by sending pulses of light through an optical fiber |
Packet Switching |
delivery of variable-bit-rate data streams (sequences of packets) over a shared network
Each packet is then transmitted individually and can even follow different routes to its destination |
"Cell" in Cell Phones |
cell phone towers emit signals 360-degrees around the tower
this is called a cell
cell of service |
1g, 2g, 3g, 4g |
first generation of cell phone technology; uses analog signals
2nd generation; uses digital signals; text messages introduced
3rd generation |