What is a Modem

In Networking by Danny Smith1 Comment

What is a modem

About modems :

The term modem is short of modulator demodulator. It is a hardware device that is used to modulate and demodulates analog signals from encoding and decoding for the purpose of converting them to digital data. There are wireless modems which are used to convert digital signal into radio packets and vice versa.

Most modems use Frequency Shift Keying (FSK) to relay digital content over the telephone line. A good example is 300-bps modem.

When the terminal modem relays data to the computer modem, the terminal modem becomes the originating modem. On the hand, the computer modem is revered to as the answer modem. Originate and answer modems can use the telephone line simultaneously which is known as full duplex. If the transmission is one direction at a time, it is referred to as a half duplex.

Having a quicker modem

Modems that use Quadrature Amplitude Modulation (QAM) technique are faster compared to those that use Phase-Shift Keying.

They use the gradual degradation approach. Here the modems will test the line if it can handle high speed relays or not. If not the modem retreats back to slow speed relays.

Operation of modem.

They will use Internet Service Provider (ISP) to connect to any node in the internet. The transmission is routed using a standard technique known as Point-to-Point Protocol (PPP); TCP/IP relays traffic datagrams to the modem for transmission. The ISP receives these datagrams and routes them into the internet.

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Setting up a wireless modem

The procedure below describes a stepwise approach of setting up a wireless modem.

Connect Your Wireless Modem

Follow the following step to have your modem connected:

  • Connect your Ethernet cable into the modem port marked DSL. Note that you should connect the grey cable.
  • The other end of the Ethernet cable on the side of the phone filter marked Modem.
  • Connect the power adaptor of the modem and power it up.
  • Connecting Your PC to Your Wireless Modem
  • Connect the Ethernet cable to the port marked Ethernet 1 on your modem.
    The other end of the cable should be connected to your Personal Computer  Note the yellow cable should be used in this stage.
  • Your modem should be up and running
  • The DSL lights will flash until the connection stabilizes. The DSL light should turn solid green if the setup was successful.

Test your Modem

Open Microsoft Edge- or your browser-. You should be re-directed to a different site when you should finish the rest of the installation.

Types of modems

Intelligent and standard modems. Intelligent modems are advanced and accept new commands. Standard modems are operated by command from a microcomputer.

Internal and external modems. The external modem is connected to serial port by use of an Ethernet cable. Internal modem is basically modem card. To add it to the system unit of your system you have to use one of the expansion slots.

Actually, modems help us facilitates connection by modulating and demodulating analog signal for the purpose of digital transmission.

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