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| What is SDSL |
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| SDSL (ISDN digital subscriber line) is the longest ranging of new DSL access technologies used to provide high speed, always on, network services over existing copper wires. |
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| What are the key benefits to SDSL |
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| SDSL has several deployment advantages over other DSL technologies such as ADSL and SDSL, and is better suited as a high quality, low cost, alternative to analog dial services: |
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| What does it take to order SDSL ? |
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| You need to be within 25,000 feet range of a key phone company installation in Ames, Ankeny or the Des Moines metropolitan areas. |
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| What are the factors when ordering SDSL ? |
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| Beyond the distance factor you of course need to have knowledge of how the phone company wiring comes into your building. Also you may request a site survey at modest or even no cost in certain circumstances and do ask us about this option. |
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| SDSL |
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- SDSL uses proven loop technology (based on existing ISDN circuits) and can operate up to 18,000 feet, or longer with repeaters. This means service providers can offer a DSL service to all customers, irrespective of their distance from the central office. Other DSL technologies cannot operate through repeaters and very quickly lose their speed advantages over long distances.
- SDSL can operate through a digital loop carrier (DLC) based circuit, unlike other DSL technologies. It is estimated that up to 50% of customers are served through DLCs today in some locations.
- SDSL operates at significantly higher speeds than analog modems, and provides an always-on network connection.
- SDSL offers a fully symmetric service
- No loop qualification is required, significantly reducing the deployment cost of the service.
- Although based on the ISDN transceiver technology, SDSL does not operate over the ISDN voice switch; it is terminated at the DSLAM (digital subscriber line access multiplexer). This offloads the voice network of the high-utilization data calls and ensures the service provider can make more efficient use of the existing networks.
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| SDSL uses ISDN-based copper circuits, existing 2B1Q signaling, but does not use the D-channel signaling for circuit establishment and monitoring. Unlike ISDN, SDSL has no call set-up sequence and will be positioned by the service providers as a flat rate service, rather than usage based. |
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