If you lived in Seattle and wanted to chat with a friend living in Tokyo, it would take your messages at least 23 milliseconds to travel through undersea cables to reach Japan. 6 In other words, it takes a millisecond for every 206.9 kilometers of fiber your internet signal has to travel. Light travels about 31% slower in a fiber-optic cable, which means your data travels at 206,856,796 m/s. Light travels slower when it’s passing through another substance, such as water, air, or fiber-optic cable. When people talk about the speed of light, they usually mean the speed of light in a vacuum. In contrast to some other types of connection, fiber-optic cables literally transmit data at the speed of light! Download speed is what people are usually talking about when they want to know how fast your internet connection is, but fiber is fast in other ways too.
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