April 2003
Intermediate to advanced
432 pages
11h 10m
English
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DSL-Specific Technical Impairments
DSL has specific impairments beyond the normal metallic media considerations of attenuation and sharing of the voice telephony infrastructure. Specifically, DSL impairments include the following four topics:
Load coils
Bridged taps
Crosstalk and frequency interference
Copper impedance mismatches
These topics are illustrated in Figure 2-2 and are discussed in the following sections.
Load Coils
Early in the evolution of mass telephony, long loops had to be conditioned to maintain clear voice signals toward the end of the loops. Many telephone service ...
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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.