Depending on the type of Internet service you have, different modems are required. Because a Digital Subscriber Line (DSL) and Asymmetric Digital Subscriber Line (ADSL) use a different method to connect to the Internet than cable, each requires its own kind of modem. Cable and DSL modems cannot be interchanged; you need a modem that is compatible with your type of Internet service.
What is the difference between a DSL and cable modem?
The primary difference between DSL and cable modems is because of the different means each uses to connect to the Internet. DSL/ADSL uses phone lines to deliver an Internet connection and cable connects to the Internet using the same lines that deliver cable TV to your home. You cannot use a DSL modem for a cable Internet connection because it is designed to work with phone lines instead of cable lines, and vice versa.
Can I use my cable modem in another house?
If you are sticking with cable Internet in your new house, you should be able to use your cable modem in another house. However, if you are changing your Internet service provider (ISP), make sure your existing cable modem is compatible with your new ISP.
Before moving your cable modem to a new house, make sure you own it. Most ISPs have modems available for customers to rent for a monthly fee. If you did not purchase your modem at a store, and it was provided to you by your cable company, you may need to return it. This is especially true if you are changing your ISP.
Even if you stay with the same ISP, you could need a different modem. You may be upgrading your service or the ISP made changes that require a modem with different technical specifications. The best way to know if your current modem will work is to contact your ISP.
Can I use my cable modem with AT&T U-verse®?
A cable modem will not work with U-verse. U-verse doesn’t use cable lines to deliver the Internet connection, so a cable modem is not compatible. Contact the ISP or review the service description on their website to learn what modems are compatible with U-verse.
Do I need two modems for phone and Internet?
Most of the time you do not need separate modems for phone and Internet. If your services are bundled from the same provider, one modem should be all you need. The best way to know if additional modems are required is to contact your ISP.
Do I need two modems for two routers?
Generally, you would not use two routers with one modem. It is possible to connect two routers to one modem. The problem with using one modem and two routers is that a modem will usually be connected to one Internet account, so setting up separate networks and security on one account is usually not possible. If you’re looking for a backup to your network, piggybacking two routers on one modem may provide what you need.