U5 L2 Telecommunications Timeline From Telephone To Videoconference Flashcards
What does Radio Frequency use to transmit data to an antenna?
alternating current (AC)
What is a form of RF?
microwaves
What are microwaves (transmissions) used for?
- transmitting voice and data that has been translated into RF
- point to point communications
What is the form of a Microwave?
- electromagnetic wavelengths
- range of 1-30 cm
What is a communications satellite?
instrument in space to transmit telecom
What is Wireless communication? What does it use?
- telecom using radio signals to transmit info
- RF signals transmitted via routers
Does Wireless communication use password permission?
usually
What is mobile communications?
enables internet access over a cellular network
What was the first form of electrically transmitted info?
telegraph
What were telegraph operators needed to do?
- encode
- transmit
- decode messages
Who invented the first telephone?
Alexander Graham Bell
What did Telephone operators use to connect cables that enabled the caller to speak with another?
switchboards
What are the similarities and differences between Telegraph and Telephone?
S-required human operators
D- Telegraph more operators, took longer
In the earliest days of telephone, only who could afford them?
wealthy
In the 80s and 90s, the remaining operators mainly provided what?
directory assistance
Today the most common employer of telephone operators are who?
emergency services (911)
Until the mid-1960s US households had a black phone provided by what company?
AT & T
What is the similarity and difference of RF and Microwave Transmission?
S- use wireless tech and antennas
D- RF uses AC
What is the TCP/IP protocol suite?
internet comm protocol using a series of physical and logical layers
What did the invention of TCP/IP protocol lead to the invention of?
phone modems
What are the positive impacts of TCP/IP protocols?
-no need to physically transport messages
Has the scanner made the fax machine mostly unnecessary?
yes
When was the WWW invented?
1992
WWW was based on a govt-based network known as what?
ARPANet
What was ARPANet originally used to connect?
university campuses involved in military research
In 1983, what did ARPANet adopt and do?
TCP/IP, open access to other org
What was one of the first methods to enable online comm using data transmissions?
FTP, File Transfer Protocol
Connectivity was established through () and required a () between transmitter and receiver
modems, string of commands
What was connection speed partly determined by?
- type of modem
- protocols established
Where is FTP still used today?
webpage serves allowing users to upload files on display
Why do some people today claim that email is becoming outdated?
spam
What is telephony?
concepts and tech comprising telephone telecomm services
voice, data, VoIP
Is VoIP tech always free?
no
What is communication theory?
concepts and rules governing the process of communication
How many elements are needed for communication to take place?
6
What are the 6 elements for communication to take place?
- Source
- Sender
- Channel
- Receiver/Destination
- Message
- Feedback
SSCaRM MF
What is Channel in terms of an element of communication?
way message is sent
What is Receiver/Destination in terms of an element of communication?
processing info of message (decoding)
What is the biggest drawback of communicating through text?
lack of nonverbal cues (why emoticons made)
What is analog?
comm tech that uses physical characteristics of electricity
Analog tech transmits info using what?
electric pulses
What is the best example of Analog communication?
human voice
Today, do we depend on analog or digital communication?
digital
