- DSL modems use Ethernet or USB 2.0 to connect to your computer. The slowest Ethernet speed is 10 megabits per second (Mbps), which is faster than most DSL Internet connections. USB 2.0 operates at speeds up to 480 Mbps. This USB bandwidth must be shared with all the other USB devices connected to your computer. The bandwidth allocated to your modem will be more than adequate unless you have many other USB devices that operate simultaneously.
- Many newer modems support fast Ethernet, which operates at 100 Mbps. Also, most network adapters function at the same speed. For connecting to your ISP, this speed is unnecessary. However, it may be useful if you want to set up a local area network. It's more important to ensure that your DSL modem fits the type of DSL service you have. For example, you will need a different modem for asymmetric DSL (ADSL) than for symmetric DSL (SDSL). Also, a modem with a built-in router may be handy if you're thinking of creating a home network.
- DSL modems have RJ-45 Ethernet ports on the back side. These look like large telephone cable connectors. On the front, there will be labels such as "Power," "Ethernet," "DSL," "USB," "Activity," "VOIP," "PPP," "LAN" and "Data." If the modem is also a router, it will have additional Ethernet ports. Modems that function as wireless routers will usually have one or more antennas.
- Your DSL modem connects directly to your computer if you don't have a local area network. However, once you do set up a network, whether it's wired or wireless, your DSL modem will connect to your computer through the network router. This will allow you to share your broadband Internet connection with other computers on your LAN. For faster networking, get a fast Wireless-N router and access points.
- If you're experiencing slow DSL Internet connection speeds, the speed of your modem probably is not to blame. There are many factors which can cause your high-speed broadband connection to slow down. Internet congestion is one of the most common causes of a slow Internet connection. If you're using an older computer to access the Internet, this can cause problems as well. Running out of memory while surfing is another common issue. Your CPU may also get overloaded with processing your uploads and downloads. If you're experiencing problems with your Internet connection, run a full diagnostic to find what's causing the problem (see Resources below).
