Here is a direct quote from “Why such slow Wi-Fi?” in a recent Los Angeles Times

Question

Here is a direct quote from “Why such slow Wi-Fi?” in a recent Los Angeles Times article:

“In an analysis of fixed broadband and mobile speeds in July, Speedtest ranked the United State No. 9 for broadband and No. 46 for mobile (Nos.1, respectively, Singapore and Norway. Last: Venezuela and Iraq).

Part of the issue for Americans: Many of us still have home service based on copper wire, not fiber.

Craig Ganssle, chief executive of Camp3, which works on wireless infrastructures, explains this difference: Copper service is based on the speed of sound (generally about 1,125 feet per second if it’s 68 degrees and the air is dry), and fiber is based on the speed of light (about 984 million feet per second).

With a few exceptions, most of us get our home Internet access through a cable modem or a DSL modem, and the wires that connect our modems to our ISPs are made of copper. Let’s assume you are streaming a Netflix movie. The nearest Open Connect appliance, which Netflix uses to host and deliver movies to customers, is 3 miles from your home. Let’s also assume you have already found the movie to watch and is ready to start. You click on the Play button, a one- bit signal is sent over the 3-mile copper wire to reach the Open Connect appliance, which then starts sending the digitized movie frames back to your home, also over the 3-mile copper wire.

Questions:

Given the quoted speeds above (i.e., 1,125 feet per second vs. 984 million feet per second), from the moment you click the Play button, to the moment the first bit of the movie appears on your screen, how long will it take (round-trip time) over a copper wire? Over a fiber optic cable? Note: 1 mile = 5,280 feet

How does your calculated result over a copper wire compare to your own experience of streaming movies on the Internet? What is your conclusion?

Explanation / Answer

Speed of signals over copper wire is 1125 ft / sec.

Speed of signals over fiber cable is 984 M ft/sec. or 984 * 106 ft / sec.

As, the distance covered in round trip time is 3 miles + 3 mlies = 6 miles.

Given is, 1 mile = 5280 feet

Therefore, 6 miles = 6 * 5280 = 31680 feet.

Time taken by copper wire to travel 1125 feet = 1 second

Therefore, Time taken by the copper wire to cover 31680 feet = 31680 / 1125 = 28.16 seconds.

Time taken by fiber cable to travel 984 * 106 feet = 1 second

Therefore, Time taken by the fiber cable to cover 31680 feet = 31680 / 984 * 106 = 32.19 * 10-6 or 32.19 microseconds.

In my experience, as we mostly use moblie internet, the speed we get with optic fiber is far more greater than we are getting with the mobile internet. Though installation of optic fiber is expensive and their maintenance is also difficult as comapared to nearly zero maintenance and installation cost of mobile internet, but once it is installed we can enjoy very high speed internet without any problem of buffering, jitters etc, Hence, we can enjoy our experience of using internet for entertainment or official purpose.

Conclusion- The time has come when we should shift ourselves to optic fibers, though it seems expensive and complex, but it is worth it.

Thank you. If any quries, ask in comment section. Will have a healthy discussion.

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