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The 8 Best adsl modems of 2025

Are you trying to find adsl modems among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling adsl modems on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 22 hours of research and did 33 adsl modems tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best adsl modems you can buy today

SaleNo. 1
TP-Link ADSL2+ Modem, Up to 24Mbps Downstream Bandwidth, 6KV Lightning Protection (TD-8616)
  • Support ADSL/ADSL2/ADSL2+ standards. Not compatible with VDSL service.
  • Up to 24Mbps downstream bandwidth
  • One Phone line port and one 10/100M Ethernet port
  • Built-in firewall protects against Internet attacks
  • 6KV Lightning Protection avoids the damage from thunderstorms
No. 2
NETGEAR High-Speed Broadband DSL Modem (DM200-100NAS). Compatible with CenturyLink, Verizon, and Frontier)
  • Compatible with only DSL internet service providers such as CenturyLink (non-bonded VDSL) and Frontier (non-bonded VDSL)
  • Not compatible with upgraded vectoring CenturyLink DSLAM
  • Please contact your ISP for PPPoE username/password and VPI/VCI information before installation
  • Not compatible with Verizon FiOS, AT&T U-Verse or bonded VDSL
  • VERY IMPORTANT ** Please Note: Kindly refer the Instructional Video, the User Manual & the User Guide before use which is highly essential
  • Built-in VDSL, compatible with ADSL connections - Compatible with VDSL, VDSL2, ADSL, ADSL2, & ADSL2+
No. 3
TP-Link Archer VR2100 AC2100 Mbps, 4 Gigabit LAN Ports + 1 USB 3.0 Port, MU-MIMO, Super VDSL, Easy Installation with Tether App, Dual Band Fibre Supported Wi-Fi 5 VDSL/ADSL Modem Router
  • Super VDSL – Latest Super VDSL (VDSL2 Profile 35b) technology delivers internet speeds of up to 350 Mbps
  • Ultra-High Speed – Exceeds previous generation Wi-Fi speed limits to 1733 Mbps at 5 GHz and 300 Mbps at 2.4 GHz
  • 4×4 MU-MIMO – Transmits data to multiple devices at the same time for 4x faster performance
  • Whole Home Network Coverage with OneMeshTM – Works with TP-Link OneMesh products to create flexible and cost-effective Mesh network
  • Lightning Fast Cable Connectivity – The USB 3.0 port and four Gigabit Ethernet ports run up to 10 times faster than previous generation to release your home fun
No. 4
NETGEAR D2200D ADSL Modem/Wireless Combo for Frontier
83 Consomer Reviews
NETGEAR D2200D ADSL Modem/Wireless Combo for Frontier
  • Compatible with Frontier ADSL Service - NOT FRONTIER VDSL! Please Verify Prior to Purchase
  • Fast WiFi N300 speeds for a reliable video and streaming experience
  • Compatible with ADSL/ADSL2+ Service Only
  • ADSL Modem with Integrated 4-Port Wireless Router
  • 4 Gigabit Ethernet Ports + 1 DSL Phone Port + Power On/Off Button
No. 5
ZyXEL P660HN-51R Adsl/ Adsl2+ Wi-Fi Router with Built-in Modem [P660HN-51]
  • Stop renting and save money by purchasing your own ADSL2+ modem+router. The p660hn-51 is compatible with most ADSL based internet connections, such as those provided by AT&T, CenturyLink, and Verizon as well as many other Providers using your phone line to provide internet service
  • Built in router, Wi-Fi, and 4 port switch make it easy to share your internet connection anywhere in the home and with no second box required
  • Includes a built-in setup Wizard and auto-detect feature to simplify the setup process by doing most of the configuration automatically
  • Please note This product only supports ADSL, ADSL2, and ADSL2+ internet services. Will not work with bonded ADSL, VDSL, fiber, or cable based internet Providers. If in doubt, contact your ISP first to verify what type of service you currently have
No. 6
MOTOROLA VDSL2/ADSL2+ Modem + WiFi AC1600 Gigabit Router, Model MD1600, for Non-Bonded, Non-Vectoring DSL from Frontier and Some Other DSL Providers (Renewed)
  • This Certified Refurbished Motorola Gigabit Wi-Fi router is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com
  • MODEL MD1600 DOES NOT WORK WITH BONDED VDSL, BONDED ADSL, OR VDSL VECTORING. PLEASE READ THE CHECKLIST IN THE PRODUCT IMAGES BEFORE PURCHASING. If you’re still not sure whether you have the right type of DSL service, MODEL MD1600 IS NEVER COMPATIBLE with Verizon, AT&T services, Comcast, Charter Spectrum, Cox, or other cable services
  • MD1600 IS A GREAT CHOICE for many non-bonded/non-vectoring ADSL AND VDSL SERVICES FROM FRONTIER, WINDSTREAM, TDS TELECOM, AND FAIRPOINT. Motorola md1600 Gigabit DSL modem router frontier combines a VDSL2/ADSL2+ Modem with a full-featured AC1600 Wi-Fi Gigabit Router to provide fast Internet to all your Wi-Fi and Ethernet devices
  • BUILT-IN ROUTER INCLUDES 4 GIG-E PORTS, AC1600 WIRELESS, a firewall, WPA/WPA2 wireless security, IPv4 and IPv6 support, and Virtual Private Network (VPN) capability. You can plug a USB storage device into the USB 2.0 host port for Network Attached Storage (NAS) which supports DLNA Media Sharing
  • CLEAN AND EASY: This DSL modem/router combo saves space, reduces wires, and includes a setup wizard for fast, easy installation. Delivers Internet speeds up to 100 Mbps; speeds depend on the speed of your VDSL or ADSL Internet service
No. 7
Keple RJ11 Cable ADSL 3ft Extension Lead Phone Cord Telephone Plug High Speed Xfinity Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket/Microfilter/Landline Wire (Black)
  • HIGH SPEED – Keple flat RJ11 to RJ11 provides high-speed transmission and its faster than most of other modem extension cables.
  • EXTRA DURABLE – ADSL cable has fully molded strain relief and better shielding than most of other RJ11 extension cables. This RJ11 telephone extension cable molded connections improves durability and strength reducing the risk of cable and connector separation.
  • QUALITY ASSURANCE – Internet broadband lead is approved by RoHS certificate. This Keple high speed telephones cable provides protection from bending and interference that can reduce the signal quality.
  • SOFT & FLEXIBLE – RJ11 to BT cable is soft and flexible for ease of use and avoids the hassle of entanglement but remains strong to provide superior performance.
  • UNIVERSAL COMPATIBILITY – This RJ11 cord is compatible with ADSL router / modem, Xfinity/Comcast, Spectrum, COX, Altice USA, AT&T, WOW! and Cable One (Internet service provider) devices.
No. 8
Awishwell DSL Filter Splitter for Phone Line, 2 Pack RJ11 6P2C DSL Filter, DSL Phone Line Filter Splitter 1 Male to 2 Females, White ADSL Modem for Telephone
  • DSL Filter Splitter: DSL Filter for Phone Line separates DSL and voice signals on a telephone line, ensuring clearer voice communication while using broadband internet
  • Effective Noise Reduction: Our DSL Modem that effectively eliminates noise and interference. Say goodbye to static, crackling sounds, and distorted voices
  • Universal Compatibility: Our DSL Phone Line Splitter works with all standard telephone lines and DSL modems, ensuring compatibility with your existing setup. DSL Phone Cable Splitter Adapters are suitable for a wide range of answering machines, telephones and fax machines
  • Easy Installation:Simply plug the male RJ11 end into your wall phone jack, then connect your phone device to the TEL port and your modem device to the MODEM port. (As shown in Figure 5)
  • Product Includes: 2 x ADSL Splitter
SaleNo. 9
D-Link ADSL2+ Ethernet Modem-(DSL-520B)
  • Get high-speed ADSL speed
  • Firewall protection & QoS
  • Easy setup - no technical experience required
  • Connect your computer using an Ethernet port
  • Safety certification: CSA International
  • Rohs compliant
  • Ethernet LAN port with auto MDI/MDIX
  • Port: 1x RJ-11 ADSL, 1x RJ-45 10/100BASE-TX Ethernet LAN Port with auto MDI/MDIX
  • Routing Information Protocol (RIP, RIPv2) RFC 1058, RFC 1723, Network Address Translation (NAT) RFC 1631
  • Get high-speed ADSL speed
  • Firewall protection & Qos
  • Safety Certification: CSA International; CE; RoHs Compliant
  • Please Note: Kindly refer the User Manual before use.
No. 10
TP-LINK TD-8817 ADSL2+ Modem, 1 RJ45, 1 USB Port, Bridge Mode, NAT Router, Annex A, ADSL Splitter, 24Mbps Downstream
  • Provide Internet access via ADSL Service and create a wired sharing network, all with one product
  • Works with the latest ADSL standards: Up to 24Mbps downstream superior performance
  • Triple Active Firewalls: SPI, NAT and Packet Filter. Supports Annex M, which can double upstream data rates
  • QoS prioritization based on ToS, DSCP, service type or 802.1p
  • 6KV Lightning Protection helps your device avoid the damage of tough thunderstorms
No. 11
Uvital in-line DSL Filter Splitter/in-line DSL Filter, RJ11 6P2C Male to 2 Female Telephone DSL Modem, ADSL Splitter Filter, DSL Filter for Landline Phone
  • ADSL Filter Is an electronic device that isolates the ADSL and voice bands. This filter is required whenever you connect a computer to the internet using Broadband over a standard telephone line. These filters divide the signals on the telephone line between the high-pitched computer modem sounds and the lower pitched human voices and hence clearer voice
  • Installation: Typical installation for an existing home involves installing ADSL filters on every telephone, fax machine, voice band modem, and other voiceband device in the home, leaving the ADSL modem as the only unfiltered device. For wall mounted phones, the filter is in the form of a plate hung on the standard wall mount, on which the phone hangs in turn
  • RJ11 6P2C Male to 2 Female Telephone Modem ADSL Splitter Filter. A DSL splitter is just a regular phone splitter with a filter on one of the outputs. They allow the internet to work on your PC through the telephone. line (connected to the modem of course)
  • Lightning-Protection Design: ADSL Splitter is well suited for Home Network. ADSL splitters take a role of separating low-frequency audio signals from high-frequency signals. They can decrease noise levels and improves signal quality
  • Plug this compact splitter into your wall jack, connect your telephone and ADSL modem, and you're done! Now you have telephone and Internet connections in the same jack. Includes an integrated noise reduction filter for clear phone conversations
No. 12
Intellinet Networks Adsl Modem Splitter/Adapter (201124)
  • Separates The Adsl Signal From The Voice Signals On A Telephone Line
  • Protects The Voice Signal & Adsl Digital Signal From The Interference Of A Telephone & A Fax Machine
  • One Rj11 At One End For Telephone Line
  • Two Rj11s At The Other End For Phone/fax & Adsl Modem
No. 13
RJ11 Cable ADSL 33ft Extension Lead Phone Cord Telephone Plug High Speed Xfinity Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket, Microfilter, Landline Wire (White)
  • HIGH SPEED – Keple flat RJ11 to RJ11 provides high-speed transmission and its faster than most of other modem extension cables.
  • EXTRA DURABLE – ADSL cable has fully moulded strain relief and better shielding than most of other RJ11 extension cables. This RJ11 telephone extension cable moulded connections improves durability and strength reducing the risk of cable and connector separation.
  • QUALITY ASSURANCE – Internet broadband lead is approved by RoHS certificate. This Keple high speed telephones cable provides protection from bending and interference that can reduce the signal quality.
  • SOFT & FLEXIBLE – RJ11 to BT cable is soft and flexible for ease of use and avoids the hassle of entanglement but remains strong to provide superior performance.
  • UNIVERSAL COMPATIBILITY – This RJ11 cord is compatible with ADSL router / modem, Xfinity/Comcast, Spectrum, Cox, AT&T and Altice USA (Internet service provider) devices.
No. 14
XMSJSIY DSL Filter Splitter ADSL Splitter for Telephone Line 1 to 2 RJ11 6P4C/6P2C Male to Dual Female Telephone Modem Converter Adapter for Fax Machine -2 Pcs
  • This DSL Filter-ADSL filter splitter for telephone line can connect a device to two other phones at the same time, which is suitable for separating the voice signal and ADSL data signal in the telephone cable, reducing the impact of noise interference of ADSL data signal on the call quality of the phone.
  • The telephone RJ11 1 to 2 converter can filter the low-frequency voice signal of the telephone and the high-frequency data signal of the computer, so that they do not interfere with each other when they are transmitted on the same cable. It can also solve the problems of ADSL up and down speed decrease and frequent power failure caused by static high frequency signal loss of some telephones.
  • The telephone splitter is made of high-quality and durable plastic material, which can maintain good signal transmission and long service life.It has the protection function of communication cable induced lightning strike and overvoltage impulse current.
  • Easy to install, no external power supply, using UL1950 standard, suitable for network ADSL client, is the telephone communication network signal the best ADSL telephone language separator.
  • Works with all standard RJ11 devices such as landlines, faxes, answering machines, landlines, office lines, DIRECTV, satellite dishes, TIVO (DVR), telephones, printers, modems, computers and more
No. 15
Antfly 3 PCS 2 Wire, 1 Line DSL Filter, with Built in Splitter, Phone Jack Splitter, in-line DSL Filter Splitter/in-line DSL Filter RJ11 6P2C Male to 2 Female Telephone Modem ADSL Splitter Filter
  • The DSL filter for phone line is made of high-quality plastic material, with high hardness, durable and safe. The plugs of phone line filters are made of pure-copper, which ensures stable signal transmission and clear communication.
  • Reduce digital noise and unwanted interference caused by DSL. You will get 3 pack Beige DSL Filter (ADSL Filter).
  • ADSL Splitter is well suited for Home Network. ADSL splitters take a role of separating low-frequency audio signals from high-frequency signals. They can decrease noise levels and improves signal quality.
  • Apply with DIRECTV, Satellite Dish, Comcast, TIVO (DVR), Telephone, Fax, Answering Machine, Printers, Modems, Computers and more.
  • ADSL splitter is just a regular phone splitter with a filter on one of the outputs. They allow the internet to work on your PC through the telephone line (connected to the modem of course).
SaleNo. 16
NETGEAR Nighthawk Cable Modem CM1200 - Compatible with all Cable Providers including Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 2 Gigabits | 4 x 1G Ethernet ports | DOCSIS 3.1, Black
  • Compatible with all major cable internet providers with internet speed up to 2Gbps. Currently certified with Cox, Spectrum and Xfinity.. Not compatible with Verizon, AT&T, CenturyLink, DSL providers, DirecTV, DISH and any bundled voice service
  • Works with any WiFi router: Connect any WiFi router to this modem’s Ethernet port to support all your wireless devices
  • Save monthly rental fees: Model CM1200 replaces your cable modem saving you up to $168/yr in equipment rental fees
  • Four (4) Gigabit Ethernet ports give you fast wired connections to your computer, separate WiFi router, printer, game box, and other devices
  • Modem technology: Engineered with 32x8 channel bonding, OFDM 2x2, and DOCSIS 3.1
  • Multi-gig ethernet: Link aggregation combines two 1G ports into one 2G port for faster wired ethernet speed.
  • Made for use in the US only
No. 17
USB 2.0 to Ethernet RJ45 Networking Adapter USB Transfer Networking Plug Adapter for Connecting ADSL Modems to Routers
  • Note: This adapter can not be USB2.0 plug in 1 other USB interfaces device, the other end connecting to the computer's RJ45 interfaces, it will not work,Do not work for USB 1.1 (Printer styles USB)
  • USB2.0 A Female To 8P8C Plug (RJ45) Adapter;
  • The rj45 male to usb2.0 female adapter can be used when the USB cable cable for edges ADSL modem or USB interfaces with a USB port.
  • USB2.0 A Female to RJ45 Ethernet Male 8P8C Connector
  • This adapter 1end RJ45 male can only be inserted in the computer's RJ45 networking , the other end USB2.0 female connecting to a USB port of the dialer or routers;
No. 18
NECABLES DSL Filter Splitter for Phone Line and Modem 6 Inductors Version RJ11 6P2C 1 Male to 2 Females White
  • ★ DSL splitter is designed to split incoming signal into separate outputs, one is for filtered voice (phone) and the other is for DSL internet (Modem)
  • ★ Prevents your phone call from voice dropouts, hissing, static and other background noises by removing the DSL band interference
  • ★ 6 inductors version, stronger filtration performance than 4 inductors one
  • ★ Standard RJ11 interface, compatible with all brands landline phone, cordless phone, fax or answering machine
  • ★ Easy to install, just plug the RJ11 male end to your wall phone jack and connect your phone device to TEL port and connect your modem device to MODEM port
No. 19
GINTOOYUN 2 Pcs USB to RJ45 Cable USB to RJ45 Ethernet Cable USB Female to RJ45 8P4C Ethernet Male Extension Cable for Router,ADSL Modem,Camera etc(11.81 Inch)
  • Note: The cable cannot be used on the network interface of the computer to plug in external devices such as USB flash drives, keyboards, mice, etc. Two cables can be paired for use, and network transmission can be achieved through a USB cable.
  • GINTOOYUN USB to RJ45 cable can be used separately to plug into a computer RJ45 network socket, and the other end can be connected to an ADSL modem and router with a USB network output socket. Two cables can also be paired together to achieve network transmission through a USB cable.
  • Connector 1: USB 2.0 female plug; Connector 2: RJ45 8P4C Ethernet male plug; Cable core: oxygen free copper; Insulation material: PVC; Cable color: black; Product quantity: 2 pieces; Cable length: 0.3m/11.81 inches (note: including plug length).
  • The cable is made of oxygen free copper, which has good conductivity, low resistance, low power consumption, long service life, and a more stable transmission network. The cable sheath adopts elastic polyvinyl chloride sheath, which is heat-resistant, wear-resistant, flame-retardant, soft, and not easy to break.
  • USB to RJ45 cables are widely used in routers, ADSL modems, cameras, laptops, desktop computers, switches, USB cables, etc.
No. 20
Hididi 2 Pack Ethernet to USB Adapter, USB to Ethernet Adapter, RJ45 Ethernet Male to USB Female Converter, USB to RJ45 Connector for ADSL Modem, Router, Camera with Network Function
  • Ethernet to USB Adapter, USB to Ethernet Adapter, RJ45 Ethernet Male to USB Female Converter, USB to RJ45 Connector for ADSL Modem, Router, Camera with Network Function.This adapter one end RJ45 male can only be inserted in the computer's RJ45 network jack, the other end USB2.0 female connected to a USB port of the dialer or router, the rj45 male to usb2.0 female adapter can be used when the USB cable cable for edge An ADSL modem or USB interface with a USB port.
  • USB 2.0 Female to RJ45 Ethernet 8P8C Male, but please NOTE that you need a PoE data switch for use. Also this adapter can only work in 2 devices (one USB and one Ethernet Device), does not work for USB 1.1 either (Printer style USB).
  • USB to RJ45 adapter can be used to connect a USB ADSL modem to a router with an RJ45 socket, but please note: you need a PoE data switch.and Note: This adapter can not be USB2.0 plug in one other USB interface device, the other end connected to the computer's RJ45 interface, it will not work,Does not work for USB 1.1 (Printer style USB)
  • Instructions - 1. Using the RJ45 male end connects to the computer's RJ45 network jack, the other end of USB 2.0 female connects to the USB port of the dialer or router. 2. This rj45 male to usb 2.0 female adapter can also be used for an ADSL modem that has USB interface.
  • COMPATIBILITY operating system of the machine, such as a USB interface with a wireless ADSL dialer and router, monitoring dedicated USB interface, a network transmission function of the camera (not connected to the computer network video chat that kind of camera ).2. Don't have the equipment to bring their own operating system, such as: other need to insert the USB port on the computer tips to find equipment.

How to choose a good adsl modems

Does the idea of finding a fantastic adsl modems make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in adsl modems. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top adsl modems products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top adsl modems on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top adsl modems brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top adsl modems based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the adsl modems were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good adsl modems, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your adsl modems.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting adsl modems for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our adsl modems. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what adsl modems should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on adsl modems.