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A Sky Extension Cable is used to extend cable leads for a Sky television system. The price should be around $10 for a few meters of cable, it can increase based on the type of cable.
A lighting circuit would be a parallel circuit.
what type of cable would you used to create a ring topology?
It really depends on the USB device and the type of cable you use to extend it. The USB specification states that with a passive USB cable you cannot extend a device more than 16 feet. There are active extension cables than can be used to extend devices beyond that distance. Depending on the type of extender you use, you can actually extend the device hundreds of feet away. There are active USB cables with in-line repeaters and there are extenders that will use custom length Cat5e cable for the extension.
cable radius
Coaxial, RG-59.
The main usage of cable VoIP is main stream connections to one line using circuit connections. using this type of a connection is good for business. It is also good for the environment as it cuts down of the amount of cable needed.
The VGA cable that you would use to connect a laptop to a projector screen is called a PS2 projector cable.
A normal crossed ethernet cable will do.
Crossover
Typically most fire marshal laws would require plenum cable.
Parallel circuit.