MODEMS Flashcards
Name and expand the two types of MODEMS
Serial - Sends one bit a time
Parallel - Number of levels more than one bit
What is primary function of a MODEM?
It modulates an analouge carrier signal and encodes it in a digital format.
Name the advantages and disadvantages of a serial MODEM:
Adv: Reduces cable size and requires no sync (longer distances)
Disadv: Slower transmission times
Name the advantages and disadvantages of a parallel MODEM:
Adv: Increased data rate
Disadv: Requires an internal clock to maintain sync and needs signalling commands
What are the five types of MODEM?
Narrowband Dial Up Radio WiFi/WiMax Mobile Broadband
In a Narrowband Dial Up Modem, what are the analouge and digital sections used for?
Analouge - Generating
Digital - Setup/Control
Name and explain the operation modes within Narrowband Dial Up:
Data - The data is being sent to and from the Computer
Command - Listens to the data for commands
When would a Radio MODEM be used?
When Fibre Optic isn’t economical.
In a Radio Modem, what would utilise Direct Broadcast?
PSTN - Public Switched Telephone Network
What frequencies do WiFi/WiMax MODEM operate on?
Microwave frequencies
What is a hotspot?
One or more WiFi MODEMS
Expand WiMax and explain it’s advantages over WiFi:
Worldwide Interoperability for Microwave Access. It can achieve greater distances and speeds than current WiFi.
What are the differences between a Mobile Router and a Mobile Modem?
A mobile router is for multiple mobile connections, whereas a module modem is for one mobile connection.
What are the differences between a Broadband MODEM and a Narrowband Dial Up MODEM?
A Broadband MODEM is more advanced than traditional dial up. It’s capable of modulating and demodulating hundreds of channels at the same time.
What is the ITU?
International Telecommunications Union - An agency of the United Nations which has existed for 145 years. It is currently based in Geneva, Switzerland.
