Smart Coil™ POTS/ADSL Line Conditioners
■Document Purpose
▲This document provides general, application, installation, operat-ing, maintenance, troubleshooting, and specification information for Charles Industries Smart Coil™ products. Figure 1 shows a view of two typical, single, Smart Coils, Figure 2 shows three single Smart Coils placed inside a Smart Coil Kwik Kase, and Figure 3 shows an encapsulated Smart Coil Case.
■Product Purpose and Description
▲Smart Coil is a product that provides the line conditioning benefit of a common load coil for POTS traffic while allowing an ADSL signal to pass through. With Smart Coil, a loop that was providing either POTS or ADSL exclusively can instead handle both services on a single copper pair. Smart Coil offers an economical solution to problems and limitations associated with common load coil and build-outs, as described in the paragraphs below.
◆Problem Background. Voice quality commonly deterio-rates on unloaded pairs at distances beyond 18 kft. For loops beyond this distance, common load coils and build-outs have been used for decades to provide high-quality voice service to customers beyond this distance. Passive load coils help flatten the frequency response of the audio range (300 – 3400 Hz), however, they block the higher frequency DSL signals. Unfortunately this load coil high-frequency spectrum limitation either prevents telephone companies from offering ADSL service, requires an additional pair, or requires the physical removal of the common load coils for loaded loops.
◆Smart Coil Solution. The Smart Coil is a Charles Indus-tries invention that provides all the functionality of a common load coil for the voice band (POTS), removes the POTS loop-length limitations, and also enables ADSL to reach its full attainable dis-tance by allowing DSL to use frequencies above the voice band. Once installed, the Smart Coil is designed not to be removed when DSL is applied to the copper pair. In the past, while conditioning a pair or pairs for DSL or special services, it has been necessary to create a work activity to remove load coils from interfering with the clean and balanced circuit. In an effort to reduce subsequent ''truck rolls'' for conditioning pairs (de-loading) for these special services, the Charles Industries ''Smart Coil'' was designed to give telephone companies that capability
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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November 2008 |
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Issue 1 |
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1.4 MB |
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