October 2003
Intermediate to advanced
720 pages
19h 52m
English
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A Little Modem History
Modems can be traced back to the 1950s. They were developed to transmit data to North American Air Defense via telephone lines. The first commercial modems didn't appear until 1962, with the Bell 103 protocol developed by AT&T. The Bell System 103 Series was the first modem with full-duplex transmission and Frequency Shift Keying (FSK) modulation. It was capable of transmission rates up to 300 bits per second (bps). The follow-up product, the Bell 212 Series, boosted data rates to 1200 bps (that's four times faster than the previous product) and employed improved Phase Shift Keying (PSK) modulation.
1965 brought the development of the automatic adaptive equalizer. This invention compensated for differences in signal attenuation ...
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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.