The function modem is a hardware device that functions for two-way communication that converts digital signals into analog signals or vice versa to send a message / data to the addressee. It could also be interpreted as an intermediary to connect our computer to the Internet network. TYPES OF MODEM Many types of modems are available at this time, modem types can be distinguished by their installation and network. if based installation modem can be divided into internal modem and an external modem while the modem based network can be divided into a cable modem with the media and meodem with wireless media. Internal Modem is a card attached to the motherboard slot. This modem advantage is how easy installation and relatively cheaper price. External Modem is a modem that is installed outside the computer, usually plugged into the USB slot. Modems that use media that is a modem cable using a cable as a medium for the intermediary (eg, cable TV and telephone network) Without a cable modem, this modem uses wireless media to the intermediary eg, GSM modem, CDMA modem.