DSL modems are one of the primary sources of Internet access for your business. Most geographic areas have a companies providing DSL service and companies providing cable service. Most of these companies offer different bandwidth plans. It is up to you to decide whether you want the DSL modem provided by the company, or if you want to look into purchasing higher-end DSL modems for sale by an independent manufacturer.The following approaches will help you decide which DSL modems types and styles best suit your business needs: Consult with your local broadband ISP to find out which digital subscriber line modems they offer. Know the difference between broadband ADSL modems, wireless DSL modems and others. Browse the vast selection of DSL modems available from online retailers. Find out which ADSL modems or business DSL modems are offered by your local provider Most local DSL ISPs will provide you with a free DSL modem or wireless DSL modem when you initially sign up for service. The best way to research your options is to visit the ISP homepage. Before choosing a business DSL modem, make sure you know the different technologies available. The main types of DSL modems are ADSL (Asymmetric Digital Subscriber Line), RDSL (Rate Adaptive Asymmetric Digital Subscriber Line), SDSL (Symmetric Digital Subscriber Line) and IDSL (ISDN Digital Subscriber Line). Not all technologies are compatible with all service providers. Get an idea of what DSL modem equipment is available by browsing online retailers Once you understand how DSL works, and what DSL modems your ISP is willing to provide to you free of charge, it is up to you to decide whether or not you want to go out on your own and purchase a third-party DSL modem. There are numerous online retailers with an excellent selection of DSL modems.