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Broadband internet access -facts and terminology

Broadband solutions- xDSL and cable modems and Networking devices

| Types of DSL | Cable modems | ISDN | glossary

   What is DSL?  Digital Subscriber Line technology is a new way to utilize your existing copper telephone lines (the same broadband connections are the internet standardones 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

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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.
   DSL modems install with USB ,PCI or ethernet ports 

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.)

 We in turn, verify your access and pipe you into the Internet via our multiple and redundant OC24's and DS3's (very large pipes). Your web pages or Corporate documents are returned to you in the reverse order. Using a National Fiber Optic Network allows us to offer this service anywhere in North America that has DSL activation in the local Telco Central Office. Check out availability and pricing in your area from one of our alliance partners.

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DSL TypesxDSL = anyspeed to 8.5Mbps

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The Spyware Bug can bite you anywhere while online.‘Parasite’ is a shorthand term for “unsolicited commercial software” — that is, an Adwarez  program that gets installed on your computer which you never asked for, and which does something you probably don’t want it to, for someone else’s profit. Adware/Spyware or Malware is a huge problem not covered by anti-virus programs. The parasite problem has grown enormously recently, and many millions of computers are affected. I like the terms parasiteware or Scumware over Adware any day.  Be sure to read this complete section and take the steps to download my recommended detection and removal software. Recommended ... http://www.javacoolsoftware.com/spywareblaster.html - LavaSoft Ad-Aware6.0 or download Spybot S&D at  http://ejrs.com/spybot/ with these nasties out there in mass ...get and use all three get-in2 recommendations. Nifty Online spyware/Adware detector and removal too for placing a link to on your sites is.... http://www.spywareguide.com/txt_onlinescan.html ...try it for free and you will be amazed! ALERT: New free web surfing defensive tool is the slickest way to alert you to harmful web sites containing spyware -adware -spam bundled or drive-by programs. Install www.siteadvisor.com today and let it open your eyes before your system gets hijacked! This one works with the Google toolbar and others highlighting search engine listings that are designed to dupe you into the Adwhore clutches

Drive-by and bundled Unsolicited commercial Spyware/Adware software can typically:

  • plague you with unwanted popup advertising (‘adware’); and watch everything you do on-line and send information back to marketing companies (‘spyware’);

  • add advertising links to web pages, for which the author does not get paid, and redirect the payments from affiliate-fee schemes to the makers of the software (such software is sometimes called ‘scumware’);

  • set browser home page and search settings to point to the makers’ sites (generally loaded with advertising), and prevent you changing it back (‘homepage hijackers’);

  • make your modem (analogue or ISDN) call premium-rate phone numbers (‘dialers’) CHARGED TO YOUR PHONE BILL;

  • leave security holes allowing the makers of the software — or, in particularly bad cases, anyone at all — to download and run software on your machine;  upgrade system performance and cause errors thanks to being badly-written;

  • provide no uninstall feature, and put its code in unexpected and hidden place to make it difficult to remove.

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Should you buy these products? Based on our tests, our opinion is no. Following complaints from several PC World readers, we tested seven heavily advertised spyware-removal tools-- MyNetProtector, NoAdware, PAL Spyware Remover, SpyAssault, SpyBlocs, Spyware Stormer, and XoftSpy--and found that none were as effective as reputable free products such as Spybot Search & Destroy. A couple even installed new spyware and disabled viable competing programs..... read on and learn how the Adwhores and advertising industry condone hijacking your system for profits.


ADSL (Asymmetrical Digital Subscriber Line)
ADSL was originally designed by telephone companies to provide video-on-demand to compete with the cable industry. Turns out this asymmetrical approach is also perfect for surfing the web. ADSL is faster in the return (download) than send (upstream) direction. As a typical use on the net is to send a small request and receive a large file or download, this approach is excellent. Upstream speeds are usually 128kbps to 1.088Mbps while downstream speeds race up to 1.5Mps (dedicated PPP DSL is 8.6Mbps or over 5 times as fast as a T1 circuit).


HDSL (High bit rate Digital Subscriber Line)
HDSL was developed as a faster cousin to ISDN (64-128kbps) technology. This enabled telephone companies to offer T1 (1.544Mbps) speeds over regular copper phone wire without the use of repeaters. HDSL is the oldest and most heavily deployed version of DSL. If you currently have a T1 circuit on two pairs of copper wires, you are probably already using DSL! HDSL2 is a new standard and doubles the rate in both directions.


RADSL (Rate Adaptive Asymmetrical Digital Subscriber Line)
RADSL is basically a rate adaptive version of ADSL. Rate adaptive technology allows a service provider to adjust the bandwidth for a particular application or compensate for line length or quality. This adjustment can be pre configured or self adjusting. A larger percentage of users near a Central Office can be served by RADSL's ability to lower data rates to extend the reach of the service. Like ADSL, it also operates on standard phone lines. CLECs and ISPs can change the level of service from a remote terminal.


SDSL (Symmetrical Digital Subscriber Line)
SDSL is the symmetrical cousin in the DSL family. It was designed for applications requiring high bandwidth in both directions. Typical current speeds are 144kbps to 1.2Mbps in both directions. This is well suited toward large file transfers toward and away from users or for Web Site Hosting services. VPNs are well suited for this type of DSL.


VDSL (Very high bit Digital Subscriber Line)
VDSL is a shorter distance, higher speed derivative of the DSL family. It was intended for "the last mile", the costliest link from any service to any final destination. As this last segment is usually dedicated to a single customer, VDSL can be combined with fiber to offer cost effective, short distance runs at speeds of up to 52Mbps.

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DSL vs. Cable

   

 New cable modem/router Cable modems are the cable companies answer to high speed data access. This technology was developed to provide video-on-demand or other high bandwidth services. The technology is sound but has quite a few inherent problems with the approach. I'm sure with AT&T now controlling 40% of US cable networks we'll see some phone service integration and changes to the technology closely paralleling DSL.

1. Service : A local loop of highbred fiber cable must be available near all residences (this is not readily available for business users) to use this service. The problem is the very small percentage of currently wired users (usually newer buildings or developments) are bi-directional. This dictates that the cable companies must run inordinate amounts of new fiber that is very expensive to install and very time consuming. Currently cable modems need a service technician to install a Ethernet NIC card in your computer, hookup and test the modem, as well as install noise suppression and bi-directional cable couplings. Our CPE distributing arm will be carrying new USB (universal serial bus) end user installable cable modems to eliminate a Cable Co. truck roll.

2. Speed : The cable users are set up as a LAN or Local Area Network to share a single fiber connection among the hundreds (maybe even thousands) of subscribers. As more and more of your neighbors connect and surf the Web, your bandwidth or line speed diminishes proportionately. Those with office LANs will understand to potential bottlenecks. Max speed 1.2Mbps download which spells speed.

3. Security : Being on a Local Area Network does not provide for a secure connection for electronic commerce without firewall and encryption software. Your connected neighbors might be able to intercept your credit card or other sensitive, confidential company data residing on your local harddrive. Look for slightly higher priced cable modems that address security and VPN applications (remote workers logging into a office network) real soon.

So if availability of service, speed, simultaneous phone use or security are not concerns of yours, this service may work well for you. If you prefer a widely available system (works on your existing phone line), Guaranteed, Direct, High Speed Access that is Secure, and supported by ISPs, CLECs or ROBECs then DSL is your answer. Compare for yourself: Also AOL has entered the DSL -broadband marketplce with various services nationwide...try out a FREE 700 hour AOL internet experience ..then upgrade to DSL


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Type High speed home systems? Secure?
Cable Maybe - depends on number of users online No - shared network
DSL Yes - up to 1.5Mbps Yes

Type Low cost? Use existing phone line?
Cable Yes No - requires new cable installation and expense
DSL Yes Yes - plus simultaneous use of internet & phone

fast Time to download 100meg file
Cable Varies depending on number of users
DSL 66 Seconds at full rated speed of 1.2Mbps

DSL Vs. ISDN

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 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:

TYPE

HIGH SPEED?

SECURE?

LOW COST?

USE EXISTING PHONE LINE?

TIME TO DOWNLOAD 100Mg FILE

ISDN No - only 64-128kbps Yes No - high monthly charge plus per minute connection charge No - requires new line installation and expense over 26 minutes
DSL Yes - up to 1.5Mbps Yes Yes Yes 66 Seconds

Broadband Glossary Top of page

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.


Multiplexer An electronic device that allows one source to be split into multiple channels. The opposite of a concentrator.

NAP Network Access Provider. Service or company that provides actual entry into the Internet backbone. Also called a DSPwith companies like AT&T, MCI Worldcom etc.

NIC Network Interface Card. The hardware that handles the protocol conversion between your computer and a connected network. Used in DSL service to talk to router.

NSP Network Service Provider. Company who provides connection to networks or Internet. Also called ISP, DSP, ILEC, CLEC or Flashcom.

NTU Network Termination Unit. Equipment to facilitate DSL network access at customer premises. Also called a router.

POP Point of Presence. Location at which to gain access to a public or private network.

POTS Plain Old Telephone Service. As it sounds, your basic telephone service.

Protocol A format or rules two or more computers must follow in order to communicate.

RADSL Rate Adaptive DSL. See DSL Types for more info.

RBOC Regional Bell Operating Companies. The five companies created after the breakup of AT?, Bell Atlantic, Bell South, Ameritech, Southwestern Bell and US West.

Repeater Electronic device used to regenerate and enhance signal quality over long cable distances.

Router Electronic device that transmits and receives data packets in a network.

SDSL Symmetrical Digital Subscriber Line. See DSL Types for more info.

SMDS Switched Multimegabit Data Service. A public packet switching service used by telephone companies in major metropolitan areas.

SONET Synchronous Optical Network. A network standard that uses fiber optics to transmit data at gigabit level bandwidth.

T1 Digital transmission at 1.544Mbps. T1 is the most common data transmission technique used in North America.

T3 Digital transmission at 45Mbps. Basically 30 T1 circuits.

TCP/IP Transmission Control Protocol/Internet Protocol. Open communication protocol that allows computers with different operating systems to communicate with each other on the Internet.

Twisted Pair Cable of two 18 to 24 gauge solid copper strands twisted around each other. The twisting helps protect against electromagnetism and Radio Frequency Interference (RFI).

Upstream Refers to transmission speed from user to the Internet. Opposite of Downstream.

VDSL Very high bit rate Digital Subscriber Line. See DSL Types for more info.

VPN Virtual Private Network. A network service that is provided over a public network that is secure and works like a private network.

WAN Wide Area Network. A network with devices over a wide geographical area.

xDSL Refers to all variations of the DSL family or technologies.
The law of more -bandwidth glut | Top of page

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