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For
over 30 years, Charles (formerly Coil Sales) has pioneered load coil
technology to develop the highest performing, most reliable coils
available anywhere. Our very first product manufactured was the
revolutionary single-entry load coil. Today, our coils serve in the vast
majority of RBOC, CLEC and IOC networks, helping bring phone service to
every corner of the globe. Charles
Load Coils are furnished with a high permeability, nickel core made to our
precise specifications to guarantee lower DC resistance. Matched bifilar
quadruple-insulated windings ensure nearly perfect DC and inductive
balance. Mechanical connectors have replaced solder connections, acting as
a heat sink and eliminating intermittency in transmission due to cold
solder joints. Charles Load Coils provide a non-expanding encapsulant with
the lowest viscosity available. This encapsulant ensures total
penetration, provides a superior pressure dam, and absorbs thermal shock. |
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| How
Load Coils Work All subscribers and trunk cable facilities consist of resistance and capacitance. The resistance is determined by the length and gauge of the cable conductors. The capacity is determined by the length of the cable conductors and the spacing between the conductors The capacitive effect of the cable conductors has a direct relation on the voice band (300 Hz to 3000 Hz) from any given point. The higher the frequency, the greater the loss or attenuation (3000 Hz would be attenuated more than 300 Hz). By adding inductance (load coils) periodically into the cable facility, the capacitive effect can be cancelled, thus causing the attenuation across the voice band to be equal. Non-loaded subscriber loops should not exceed 18,000 ft. of cable. It is recommended that loops longer than 18,000 ft. be conditioned with load coils. Optimum loading can be achieved by selecting the
desired loading coil, measured in millihenries (mh), and placing them in
the cable plant at prescribed intervals. For example, an 88mh coil will
cancel 6000 ft. of capacity. Therefore, the recommended spacing would be
at intervals of 6000 ft., with the first coil place 3,000 ft. from the
start of the cable run. |
| Kwik
Kase® Load Coil Cases Every modular component, load coil, build-out capacitor, saturable inductor, etc., is exactly the same diameter: 1.3 inches. They are standardized so that you can snap them into our midget B-152 Kwik Kase according to your needs rather than having to order specially built combinations. Kwik Kases encapsulate load coils within a tough ABS plastic shell, providing perfectly sealed protection. They are then easily mountable to pedestal brackets and backboards for convenient splicing access and quick installation. With Kwik Kase Load Coil Cases, you'll save not
only time on deliveries and installations, but also on overall costs too,
because the modules can be returned to stock for future use. With all
these cost advantages, it's gratifying to know that the module also
improves electrical and physical properties. Kwik Kases can be special
ordered for non-standard sized load coils in addition to the standard mini
H88 coil. |
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| Load
Coils and DSL Deployment
Because load coils limit the high-frequency spectrum that is used for high-speed data transmission, ADSL and other broadband connections cannot be effectively deployed on circuits loaded with standard coils. Charles’ solution is the Smart Coil™ DSL Line Conditioner. With Smart Coils, customers can receive ADSL services over the same copper pair that currently transports their POTS service, even beyond 18Kft. Smart Coils provide all the voice quality enhancement of a common load coil, yet are transparent to ADSL. They allow for easy turn-up or turn-down of broadband services. By using Smart Coils in place of common load coils, service providers can immediately and cost-effectively deliver broadband services over a wider coverage area. |