March 2026
Intermediate to advanced
400 pages
15h 45m
English
Content preview from WIRELESS & MOBILE DEVICE SECURITY Third Edition, 3rd Edition
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The Dawn of Data Communication
Data communication and networking have a long history going back to 1837, when Samuel Morse developed the first practical telegraph system. In 1844, Morse sent his first long-distance message, “What hath God wrought!” encoded in Morse code, from Washington, D.C. to Baltimore, Maryland. By 1850, more than 12,000 miles of telegraph lines traversed the country, run by more than 20 different commercial operators. Telegraphy, as it was known, used start and stop signals of dots and dashes transmitted over copper wires. It was a one-way message protocol that evolved to support two, and then four, channels. Telegraphy monopolized electronic communication until 1877, when the first telephone networks started to appear. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.