ITHELPDESK

MODEMS MODEM – MO dulator/ DEM odulator MODEM is a network device which converts a computer’s digital signals to an analog transmission signal to use with telephone lines or cable TV lines or satellite connections and vice-versa. MODEMS are necessary because public telephone lines, cable lines, and microwave media use electromagnetic waves, but computers use electric pulses. Modems are used when more than one communication is to occur in the same medium. Modems can be selected to use different electromagnetic frequency bands. Some of the different types of Modems are Dial-up Modems, DSL modems, cellular modems, Broadband Modems etc.. REPEATERS Repeaters are also known as signal boosters, signal amplifiers, Range extenders or signal regenerator. Repeaters receive the inbound electrical, optical or wireless signals and retransmit the signals. One type of repeaters amplifies all incoming electromagnetic waves, including undesirable noise. It is called as amplifiers. Anothe...