What is DSL
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DSL Express Home | What Is DSL? | Our TurnKey Solutions | Our Rates | Apply GTE Territory | Apply Bell Terrirtory | Check Availability Digital Subscriber Line (DSL) technology converts existing copper telephone wire into a high speed data highway with broadband speeds at a fraction of the cost of other broadband technologies. DSL circuits are full duplex, meaning that data can flow in both directions at the same time. Traditional analog telephone conversations, faxes and modem transmissions are limited to a 3,400 Hertz analog voice channel. The maximum possible modem speed using this analog voice channel is 56K. Distance and poor line quality often make it impossible for a modem to function at the speed it was designed for. DSL transmits a broader range of frequencies over existing copper telephone wire to achieve speeds over 50 times faster than a 28.8Kbps modem, over 30 times faster than a 56Kbps modem and over 12 times faster than 128Kbps ISDN. This significant increase in speed is possible because DSL uses a dedicated secure copper wire circuit that does not go through analog telephone switching equipment and because digital data (not an analog signal) is being transmitted. By the year 2001, newer forms of DSL featuring speeds up to 60 Mbps, or 1,000 times faster than a 56Kbps modem, will start to become available on a commercial basis. DSL is distance sensitive and loses strength as it travels over copper wire. The greater the distance to the telephone company central office (CO), the lower the available speed. Distance also varies with the quality and gauge of the existing copper wire that is used for DSL. In most areas, the maximum distance for high speed DSL service is 18,500 feet. There are several types of DSL solutions available. Symmetrical DSL (SDSL) is preferred by most businesses because it is scalable starting at 256Kbps and it provides the same bandwidth to and from the Internet. Asymmetric DSL (ADSL) is best suited for users who don't need a lot of bandwidth into the Internet but which require up to a full T1 in bandwidth to download information from the Internet. ISDN DSL (IDSL) is limited to 144Kbps, but can be installed in locations too far away from the telephone company CO or in locations which have fiber optic wire instead of copper. Speed Comparison Chart
To qualify for DSL service, your location needs to be served by a telephone company CO that contains a specialized DSL circuit provider's hardware. DSL circuit providers are independent telephone CLEC's that add value to standard telephone company dry copper wire circuits by installing DSL hardware inside of the local telephone company CO. CrossLink contracts with DSL circuit providers for the copper wire DSL circuit into the telephone company CO and for a connecting circuit to CrossLink's T3 into the Internet. Using the telephone number and service address where DSL is to be installed, a reasonably accurate projection may be made of the distance between the telephone company CO and the proposed DSL service address. DSL Wiring Distance
Limitations
*Bell Atlantic will only provide DSL circuits up to 18,000 wiring feet from their equipment offices. The exact distance from the service location to the telephone company CO can only be determined after the circuit has been installed and tested. During this test the distance and circuit capacity is determined. If this distance is greater than the original projection, the maximum speed which is actually available may be less. If the speed is less than projected, the new DSL subscriber is contacted to determine if the lower available speed is acceptable. An industry standard 10BaseT cable is used to connect the DSL router to an Ethernet hub on an office network or an Ethernet card installed in a stand alone single user computer or server. Since DSL uses the same existing copper wire that analog telephones use, the telephone company treats DSL with the same priority when it comes to service. Service, should it ever be required, is available during normal business hours on weekdays, except Holidays. The telephone company indicates that most DSL circuits will be repaired within 72 hours. CrossLink provides a back-up dial-in account for use should the DSL circuit ever be out of service. T1 circuits or other premium services are strongly recommended for web servers and networks which can not afford to be off line. Service tickets on premium services receive prompt attention 24 hours a day, 365 days a year. Telephone company DSL circuits are usually installed within thirty days of receipt of order. DSL Express Home | What Is DSL? | Our TurnKey Solutions | Our Rates | Apply GTE Territory | Apply Bell Terrirtory | Check Availability Home
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