DSL Modem : What is it?
| DSL modems connect one or more computers to a digital subscriber line (DSL) or asymmetric DSL (ADSL) service through a telephone line. They transmit data at frequencies above audible levels, providing faster transmission without interfering with the regular telephone service. They transmit at up to 1.5 megabits per second – several times faster than analog modems, although providers often limit download speeds to about 256 kbps to prevent commercial use. In DSL systems, data passes through a central switching office controlled by the provider, so DSL modems can transmit only at limited distances. Also, connection speeds tend to slow down the farther the modem is from the switching office. |
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Kinds of DSL Modems include the following: |
Internal DSL modems
- Internal DSL modems fit into the expansion slots in the PCI rack in desktops or the PCMCIA slot in laptops.
- They are cheaper than external modems and take up no desk space, making them ideal for small working areas.
- They are difficult to troubleshoot and recover because there are no indicators on the outside.
External DSL modems
- External DSL modems connect to the computer via the USB port, serial port, or Ethernet network card.
- They usually have indicator lights for power, connection status, transfer activity, and other connection data.
- They are easier to install and may be transferred or shared between two or more computers.
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Connection sharing: If you have a high-speed connection in a small home or office network, consider getting an integrated DSL modem and router. This will allow you to save desk space and directly monitor connections for all members of the network. Make sure it comes with a firewall function to keep harmful files from being transferred through the network.
Interface: Choose a DSL modem with an Ethernet interface if you have an existing network card and router. If you frequently transfer between two computers, choose a USB modem for easier installation. Serial connections can handle large loads better than USB, so get a serial port modem if you send or download large files.
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