modem
Modem stands for modulation and demodulation. Modem is device that converts digital signal into analog and analog signal into digital. Modem sends and received data from one computer to another through telephone lines. The sending and receiving computers both must have modems.
The process of converting digital signal into analog signal is called modulation computer store data in digital form. Since a modem transmits data using telephone lines. So it is converted from digital to analog from.
The process of converting analog signal into digital signal is called demodulation. The modem on receiving computer receives data in analog form. The incoming analog data id converted back into digital format to be used by computer.
Features of Modem
Some important features of modem are as follows:
1. Speed: speed is the rate at which the modem can send data in bps. Typically modem speeds are 300 bps to 56bps.
2. Self- Testing: Modem can teat the digital connection with computer. It can also test analog connection with remote modem.
3. Voice over Data: Modem provides the facility of voice conversation while data is being transmitted. Both the source and destination modems should have this feature.
4. Error Control: Modem use different methods to control errors for transmitted data.
Different types of modems :
Different types of modems in terms of physical size and shape are as follows:
External Modem
External modem is attached to the system unit as an external device through telephone line. It is connected to the telephone wall jack by another cable. External modem is connected to computer using serial cable to COM1 or COM2 port. It requires external power supply. It is easy to setup. External modem is expensive.
Internal Modem
Internal modem is a circuit board that is inserted into an expansion slot on the motherboard. Internal modem cannot be moved from one computer to anther easily. It is difficult to setup than other types of modem. It is less expensive than external modem.
Wireless Modem
Wireless modem transmits the data signals through air instead of cable. It also known as radio-frequency modem. It is designed to work with cellular technology and wireless local area networks.
write a note(if forgotten, dont commit suicide)
No, just connect the cable to the cable modem and then connect the modem to the computer.
Write a note on historical changes on sectors
a nurse writes it for him or he writes it himself found in chapter 5 in the outsiders
No, in the Anime Rem writes L's name in her Death note, dying in the process as she does it for Misa's sake.
Almost always in Kilobits or Megabits. Note, this is not Bytes.
write a note on viruses
write a short note on inscriptions
write a short note on windows?
The Central Highlands is a region in the United States known for its diverse landscapes, including mountains, forests, and lakes. It is mainly located in states like Colorado, Wyoming, and Utah. The area attracts outdoor enthusiasts with activities like hiking, skiing, and camping.
write a note on mr.chips as a teacher?
write a note on hydro electricity
write a short note of west Bengal
write a short note history of computer?
Write a short note on any two constellations.
Write short note on the business
how i write a letter to client.