- A modem (modulator - de modulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmission information.
- The goal of modem is to produce the original digital from modulated signals.
- A common type modem is one that turns the digital data of a computer into modulated electrical signal for transmission and demodulated by another modem at the receiver side to recover the digital data.
- A DSL modem is a device that can be used to connect the computer to internet via DSL (Digital Subscriber Line) connection.
- The bandwidth of DSL can be from 128 kbps to 3-7Mbps or higher.
- Types of DSL modem connections are ADSL and SDSL.
ADSL:
- Asymmetric Digital Subscriber Line offers internet connection with different upload and download bandwidth.
SDSL:
- Symmetric Digital Subscriber Line has same upload and download bandwidths.
Dailup Modem:
- Dialup modem is used for establishing dailup internet connection from computer or laptop by using telephone line.
- It is not famous because only 56 kbps bandwidth.
- Dialup modem is used for establishing dailup internet connection from computer or laptop by using telephone line.
- It is not famous because only 56 kbps bandwidth.
Cable Modem:
- Cable modem is used for high speed cable internet connection.
Connections:
