 tschmidtPremium,MVM
join:2000-11-12
Milford, NH
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| reply to ddietrich
Re: Anybody got a picture of a Load Coil ? How about a drawing instead of a picture? Load coils are not usually used individually. They are typically packaged in watertight containers and spliced into outside plant cable.
The most popular type of load coil, 88 mh, is used on circuits over 18,000 feet. They are spaced every 6,000 feet starting 3,000 feet from the CO. T1 repeater spacing was designed to use the same spacing.
Load coils flatten the attenuation curve over the 0-4 kHz voice range at the expense of tremendous attenuation above that range making them incompatible with DSL, ISDN and T1. Loading also slows down propagation speed – exacerbating echo problems on long lines. That used to be a problem on analog long distance circuits before digital. |
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| To add to the above post: When you have a pair of wires, like in a telephone line, there's a capacitance between the wires. Over long distances, this can affect the frequency response and cause distortion. The load coils counteract the capacitance, reducing distortion.
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"For every fatal shooting, there were roughly three non-fatal shootings. And, folks, this is unacceptable in America. And we're going to do something about it."
» George W. Bush, May 14, 2001. |
