ISDN Modem Vs. DSL ModemFitness Equipment
ISDN Modem Vs. DSL Modem
Integrated Services Digital Networks(I|SDN) is a set of international communication standard for transmitting digital data over a telephone line. It enables to send data, voice, and video over digital telephone lines or over an ordinary telephone wire. It transmits data at the speed of 5 Kbps.
ISDN needs equipment called ISDN adapter to perform conversion between the digital sign as and analog signals. This ISDN adapter is physically and functionally similar to the modem. The ISDN modem can be an internal or external modem. ISDN modem provides high-speed Internet access. ISDN needs modems at both the transmission ends. Therefore, your ISDN access provider also needs an ISDN modem.
You can connect to the Internet using the standard modem, LAN connection, ISDN connection or the Digital Subscriber Line (DSL) connection. DSL connection is high-speed connection than allows the phone wires to transmit modulated digital content at high speed. DSL can carry both voice and data at the same time. Due to which you need not install another phone line
DSL needs a device called DSL modem to convert digital signals to analog signals and analog signals back to the digital signals. A DSL modem provides high-speed access to the information through the telephone lines. DSL modems are also known as DSL transceiver or ATU-R. You can connect DSL modem to a PC through USB or Ethernet connection.
Working of a Modem
A modem is a device that is used for modulation and demodulation of information. The working of a modem includes the following steps:
Software such as Auto Dialers in the computer activates the modem, which listens for the dial tone on the phone line.
Once the dial tone is available, the modem dials a specified number.
The modem at the receiving end answers the call and sends out a signal to the modem at the sending end. This consequence in establishing a connection.
The modem at the sending end converts digital signals from a computer to analog signals that can pass over the telephone line.
The modem at the receiving end converts analog signals back to digital signals that can be used by the computer.
The step 4 and 5 keep repeating during the online session.
Once the online session is over, the computer issues a command to disconnect the session.
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