DSL Modems

DSL Modems provide medium- to high-speed internet capability on conventional telephone lines. The term DSL stands for digital subscriber line. They tap into unused bandwidth capacity to provide analog voice and digital internet capabilities. Available from many internet service providers (ISPs), a DSL modem offers a fast, reliable internet connection. Find the right modem for your networking and Wi-Fi® requirements at Staples®.

DSL Modem Requirements
Customers need a DSL account with an ISP. The ISP verifies their telephone line is DSL compatible and provides account logon details for setting up the modem. There may be some issues in rural areas if the nearest exchange is far away, which can produce DSL speeds that may be too slow for practical use. If a phone is connected to the line, a simple filter separates the low frequency voice signal from the high-frequency data signals. If the signal is consistent, the modem is then connected to a computer using an Ethernet cable with RJ-45 connectors at either end. At that point the computer can access the internet.  

The Difference Between DSL Modems and Routers
A modem is a device that connects a computer or router to the DSL line. Its function is to provide the signal. A router gives customers the ability to set up a home network by connecting computers, and other internet-capable devices such as smart TVs. In many instances, vendors combine the modem and router into one package called a modem router.

DSL Modem Upload and Download Speeds
Most DSL services are asynchronous. This means the download speed - data coming from the internet - is faster than the upload speed - data going to the internet. This type of service is called ADSL. The maximum download speed varies depending upon the ISP and the internet package chosen, but is generally between 8 to 10 Mbps, a speed that’s fast enough for HD video streaming. ADSL2+ and VSDL services offer higher download speeds, but are more expensive. Symmetric DSL (SDSL) services have the same upload and download speeds, and are popular with small businesses, vloggers, and others who need to upload data.

What’s the Benefit of Wi-Fi-capable DSL Modems?
A Wi-Fi-capable DSL modem includes a built in router that combines the functions of both. This device allows users to receive an internet signal and set up a home Wi-Fi network for connecting mobile and other Wi-Fi-capable devices.

Is a DSL Modem Faster Than Cable?
Cable is theoretically faster than ADSL, although ADSL2+ and VSDL can reach higher speeds. In practice, the actual speed depends upon the degree of congestion experienced. ADSL speeds hold up better during busy times because customers have their own dedicated line to the exchange. Cable customers who share the cable with other subscribers often experience a greater fall off in speed during peak viewing times.

Are DSL Modems Compatible With Ordinary Telephones?
As long there’s an ADSL filter, ADSL lines are fully compatible with ordinary telephones. Phones work normally, and can make and receive calls without interference from the ADSL service, which is always connected to the internet. However, SDSL services aren’t compatible, although customers can convert to VOIP phones.