Further complicating matters is the demand for low "latency, " the networking term for how long it takes information to travel across the cable.

WSJ: A Dive Into the Digital Deep

That's the same charging standard that the tablet uses, so in theory you could travel with just one cable and switch off as needed.

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The home of cable channels Food Network, HGTV and Travel Channel is tucked between the old Brown Squirrel Furniture Store and the Dead Horse Lake Golf Course at the foot of the Great Smoky Mountains in Knoxville, Tenn.

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First introduced in the late 1800s to save the strain on horses hauling carts up the city's steep inclines, the 15, 500-pound cable-powered cars grip a continuously moving underground cable with pliers-like gear to travel the streets of San Francisco.

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The ad will run mostly on nationwide cable channels focusing on food, home and travel that could include Bravo, HGTV, Discovery and Travel Channel.

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To make the light travel enormous distances, thousands of volts of electricity are sent through the cable's copper sleeve to power repeaters, each the size and roughly the shape of a bluefin tuna.

WSJ: A Dive Into the Digital Deep

The keyboard unplugs from its cable, and we provide an extra cable that you can keep in your laptop bag, specifically for travel.

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Mr Cable called for pensioners' benefits such as the winter fuel allowance, free TV licences and travel passes to be taxed.

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