MODEM Flashcards
Define MODEM
Modulator - Demodulator
What are the 2 types of MODEM?
- Serial
- Parallel
what am i?
A _______ MODEM transmits and receives data one bit at a time, each bit following the other in a logical sequence.
Serial MODEM
What is a parallel MODEM?
A parallel MODEM transmits and receives data via a number of levels and more than one bit at a time.
2 advantages of serial modems?
- Not expensive
- Don’t require synchronisation
Disadvantage of Serial MODEM?
Slower transmission times
Disadvantage of parallel MODEM
- Requires internal clock to maintain synchronicity
- Requires signalling commands to transmit data
Where are modems often employed? Name 3
- Computer to computer
- telephone
- digital speech systems
- wifi connections
- bank/atm machines
- wherever digital communication takes place
Narrowband MODEM contain 2 basic functional parts which are?
Analogue section and
digital section
What are the 2 modems for narrowband MODEM?
Data mode and
command mode
What is being defined? Direct broadcast satellite, wifi and mobile phones all use modems to communicate, and as do most other wireless services
Radio modems
What are the 2 types of wireless data MODEM?
Wifi and
Wi-Max standards
what am i? the coverage of one or more (interconnected) access points?
Hotspots
Define Wi-Max
Worldwide interoperability for microwave access.
Major difference between wifi and wi-Max
wi-Max allows for greater speed and a greater distance.
