What is a modem?
The modem is an abbreviation of modulator-demodulator. It is a peripheral networking device used to send and receive data over the telephone line, cable or satellite.
The modem performs modulation, the process of variation of one or more properties of carrier signals, and demodulation, the process of extraction of original information from carrier signals.
The modem connects to Internet Service Provider through telephone wire plugged via RJ-11 connector and can be connected to different devices through RJ-45 connector as well as wireless radio signals.
There are many types of modems but a few are listed below.
Dial-up Modems: In the 1990’s the dial-up modems were used to connect the internet by a lot of users from around the world. These were used to convert data in the analog form (over telephone lines) and data in digital form (data on computers). Dial-up modems were internal and external. Internal modems were designed internally in the computers while external modems were plugged into computers.
Intelligent Modem: A modem that responds to commands and can accept new instructions during online transmission. It was originally developed by Hayes.(Ref: yourdictionary)
Short haul Modems: Short haul modems provide local communication between dataloggers and computers. Typically, two modems are required—one at the datalogger end and one at the computer end. Ref. Campbellsci
Broadband Modems: Broadband modems fall under the category of high speed modems. You can enjoy high speed internet only if you live in an area where broadband service is available. Broadband modems have main three types i.e. 1) cable modems, 2) DSL(Digital Subscriber Line) Modems, and 3) Wireless Modems(WiFi Modems).
What is router?
Router and Modem Combo
Both router and modem are different in terms of functionality and usage but some internet service providers offer a device which combined functionality of modem and router. This device is hybrid type and is called router and modem combo. This device has no proper name.
Router/modem combo is built to simplify the process of creating LAN/WLAN. Having this hybrid device, you do not need separately configure modem and router.
Using two different devices have more flexibility as compared to using a hybrid device. It also lets to make sure that you are using best quality devices. The downside of using hybrid device is that ISPs may cost some extra money.
Difference between modem and router
- The modem is used to connect to internet while the router is used to connect to different networks.
- To connect to internet modem is necessary while router is necessary to connect devices in local area network or two different networks.
- Modem needs to be connected through RJ45 and RJ11 connectors while routers only support RJ45 connectors.
- Modem does not provide security measures but router provides security in the network against intruders.