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Broadband solutions- xDSL and cable modems and Networking devices |
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| Types of DSL | Cable modems | ISDN | glossary |
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What is
DSL? Digital Subscriber Line technology is a new way
to utilize your existing copper telephone lines (the same  ones
in your house or business) and deliver very high speed internet connections. It works like
your existing, slow dial-up modem but without the slow dial-up part. With DSL you are
always connected directly to the Internet (or Corporate Intranet) with your own
secure, dedicated line. Access speed can be allocated remotely from 128 Kbps all the way
to 8 Mbps as needed based upon phone line conditions and distance from the CO.This is accomplished by multiplexing your telephone line into 3 separate bandwidths or frequencies by the xDSL modem. Currently your voice is carried over the lower frequencies (30hz to 4khz) leaving the higher frequencies or bandwidth unused. DSL technology has enabled us to utilize the higher frequencies for two way data transmission at very high speeds. This way we can use the 300khz to 700khz band for upstream transmission and 1000khz and above for wide frequency, very high speed downstream service. And since we are using the bandwidth your current phone doesn't, you can talk on your phone and surf the net at the same time. With DSL you save on the expense of an additional phone line. Optionally a xDSL modem/router can connect all networked computers within your home or office to the same high speed line. The Heck with dialup Internet access ..Get DSL or Cable Modem service Select a CompUSA product category and see instant results
below...
Click here for the CompUSA latest Daily specials and Markdowns More: Also by separating your voice and
data into discrete channels, we can transfer the data portion over new, optimized packet
or cell switched connections. This is far superior and faster than using existing,
congested "legacy" phone networks built 50 years ago for voice transmission (or
telegraph) only. Results: T-1 speeds without the cost. Your DSL service works by sending (via your
new plug-n-play digital modem, also called a router) your requests to the local telephone
facility or Central Office. At that point you are placed on our Fiber Optic Network (Frame
Relay and ATM) and directed to our facility. The various flavors of DSL address the needs
of upload speed (All Web pages involve mostly downloading so ADSL gives max speed to that
task) SDSL matches the speed in both directions for business applications requiring lots
of file uploads. (Web page authoring, CAD drawing exchange or bi-directional video
conferencing, etc.) Computer Closeouts About Tech for Less, Inc. As you might have already noticed, we are not like most computer and electronics stores. Tech for Less only stocks product that we can sell below the price other online merchants charge. You will see that our inventory never looks the same twice and that we stock all major brands of computer products ranging from high-end servers, CRT or LCS monitors, to little inkjet printers. And don't forget to look at our televisions, MP3 players and more great deals. Check out their New Arrivals ... Final Clearance Sales ... Web only specials Tech for Less has been in business since early 2001 and we are one of the world's largest stocking vendors of new, new open-box, excess, refurbished and end-of-life name brand computer equipment, peripherals and electronics. All our products carry the manufacturer warranty unless specifically noted otherwise. In such a case, Tech for Less will warrant the item for the same period as the manufacturer to ensure your satisfaction. Laptop specials or printers, MP-3 players and the Closeout systems pages are popular with our Cybermall shoppers. Our philosophy for doing business is simple. We want you to feel comfortable ordering all your computer and electronic needs from us. Not just today, but for years to come. That's why we guarantee your satisfaction with any excess computer gear we offer for liquidation prices. The PcStore recommends if you see a deal you like at Tech for Less you take action right away as they only carry limited stock, and with these great prices, items sell out quickly. |
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DSL Types |
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ADSL (Asymmetrical Digital Subscriber Line) HDSL (High bit rate Digital Subscriber Line) RADSL (Rate Adaptive Asymmetrical Digital Subscriber
Line) SDSL (Symmetrical Digital Subscriber Line) VDSL (Very high bit Digital Subscriber Line)
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| DSL vs. Cable | ||||||||||||||||||||||||
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| DSL
Vs. ISDN
DSL is actually a higher speed version of
ISDN which itself is an improved, higher speed version of older, analog dial-up modems. ISDN stands for Integrated
Services Digital Network or the ability to combine voice and data on the same
line. Unfortunately due to reliance on Telco site inspections and building digital switch
boxes for deployment, plus a specialized ISP (often the same Telco) to program the special
router, ISDN never really caught fire. Between the additional phone lines and marginal
gain in speed over a 56kbps modem, most users felt that it wasn't worth the hassle. ISDN
offers dedicated, always on access, ( requires a ISP assigned static IP address) or dial
up access, but comes with an additional bill for minutes used. ISDN is secure for
e-commerce transactions, but at 64-128k it is painfully slow. The following chart shows a
side-by-side comparison:
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| 10BASE-T The Institute of Electrical and Electronic Engineers
(IEEE) specification for Ethernet over unshielded twisted pair cable. ADSL Asymmetric Digital Subscriber Line. High speed technology utilizing existing phone lines to transmit data. Typical speeds are from 144Kbps to over 8Mbps currently. See DSL Types for more info. ATM Asynchronous Transfer Mode. High Bandwidth packet technology that uses 53 byte fixed sized cells to deliver data, voice and video. The backbone of the new Telco network ATU ADSL Transceiver Unit. Equipment used for DSL technology. In the Central Office it is called ATU-C (central) and in the Customer locations it is called ATU-R (remote). See our home page for diagram. Backbone A central very high speed fiber network that is used to connect smaller, independent networks. Bandwidth A term used to describe the number of bits that can move across a communications system in a given amount of time. BPS Bits per second. The number of bits passing a point every second. The rate of transmission for digital signals. Broadband Data transmissions of voice, data and video signals over a single medium at high speeds. Cable Modem Modem designed for use with coaxial cable circuit. Campus Network A local network between floors of a building or between buildings of close proximity. Usually runs are short distance and without public access. CAP Carrierless Amplitude Phase Modulation. A two dimensional line code used in ADSL. CLEC Competitive Local Exchange Carrier. The new competitors to the original Bells after deregulation. See also ILEC. CO Central Office. The building used by telephone companies to connect local users to their infrastructure. Concentrator Electronic device used to aggregate several channels or sources into one stream for transmission over one line or link. Opposite of Multiplexer. CPE Customer Premises Equipment. Terminating equipment supplied by carrier for use at customer site i.e. modems, phones, routers. DACS Digital Access & Cross-Connect System. A digital cross-connect device used to route lines to multiple ports. Dedicated Circuits Telecommunications lines reserved along predetermined routes for specific customers usually in a point to point configuration. DNS Domain Name Services. Name (actually numbers) used by servers for identification in a local or global network Downstream The direction of data returned from the Central Office back toward the user. Usually used with transmission speed (i.e. 1.5Mbps downstream) DSL Digital Subscriber Line. Technology that combines two way voice and data transmissions at very high speeds over normal phone lines. See DSL Types for more info. DSLAM Digital Subscriber Line Access Multiplexer. Equipment used in the Central Office or Intranet to concentrate local users onto a fiber Backbone DSP Digital Service Provider. New breed of Internet Service Providers who specialize in direct, digital Internet connections like Flashcom. DSU Digital Service Unit. Digital device at customer premises to facilitate xDSL service. Also known as a Modem or Router. E1 The European equivalent of our T1 that operates at 2.048Mbps. E-Commerce Electronic Commerce. Electronic transactions between business and customers via the Internet. These are typically private and secure. Ethernet Term used to describe a baseband LAN specification originally designed by Xerox. IEEE 802.3 describes the current standards for this protocol. Firewall A secure gateway or virtual wall between two different computer networks that will prevent unauthorized use or access. Fractional T1 A portion of a T1 circuit that has been divided into 24 separate 64Kbps channels. Actual size is a multiple of 64. Frame Relay A data communication technology based on packet switching of variable length frames that are protocol independent. FTP File Transfer Protocol. Method for accessing and transfer of files to or from an Internet Server or Workstation. Gbps Giga bits per second. 1,000,000,000 (one billion) bits per second, a measure of telecommunications speed. A thousand Megabits. HDSL High bit rate Digital Subscriber Line. See DSL Types for full definition. HTU HDSL Transceiver Unit. Electronic device used for the sending and receiving of HDSL transmissions. At the CO side it is called HTU-C (central office) and on the user side it is called HTU-R (remote). IDSL Integrated Digital Subscriber Line. An ISDN based version of DSL using 2BIQ line code. ILEC Incumbent Local Exchange Carrier. All the original Bells are called ILEC's after the Telecommunications Act deregulation. All new competitors are known as CLEC's Internet Global network of interconnected commercial, governmental and educational computers using TCP/IP as a communications protocol. InterNIC Co-op between National Science Foundation and Network Solutions for registration and tracking of Internet domain names. Intranet A private network that uses Internet software and standards. IP Internet Protocol. A software standard that controls the flow and routing of content between Internet devices or machines. ISDN Integrated Services Digital Network. Public circuit switched network that combines voice and data into a single medium. Usually runs at 64K or 128K, predecessor to DSL technology. ISP Internet Service Provider. Company that provides connection to the Internet typically via a dialup link (i.e. AOL, Always Over Loaded) . See DSP for a better definition of service. IXC Inter Exchange Carrier. All telecommunications companies who provide long distance service, a.k.a. Common Carriers. Kbps Kilo Bits Per Second. A measure of time relating to telecommunications speeds. One kilobit is 1,000 bits of information, the higher the number the faster the transmission speed. LAN Local Area Network. A data communications networks of computers, printers, file servers, etc.. in a local environment. LEC Local Exchange Carrier. Provider of local telecommunications services. See also CLEC, ILEC Local Loop Also called the "last mile". The length of telephone wire from the local Central Office to it's final termination at customer premises. Usually about 1-3 miles or less. Mbps Mega Bits Per Second. Like Kbps a measure of transmission rates. One Megabit equals 1,000 kilobits. 1.5Mbps DSL is a heck of a lot faster than your current analog 33.8-56K dialup service. Modem An antique electronic device that was used to modulate or change your computers digital output to an analog form for transmission over separate, dedicated phone lines. The old school of data transmission. MTU Multi-tenant units like office buildings, apartments, Condos, that own their own copper wires and wish to share or charge for highspeed access.
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CompUSA specials: 
