November 2007
Intermediate to advanced
736 pages
46h 32m
English
Content preview from Consumer Electronics
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LINE SYSTEM CHARACTERISTICS
The simplest form of two-wire line is produced by using bare conductors suspended on insulators at the top of poles (Fig. 37.3). The wires must not be allowed to touch each other; this would provide a short circuit and would interrupt communications.
Fig. 37.3 Simple overhead two wire lines
Another type of two-wire line consists of conductors insulated from each other in a cable, which also has an outer cover of insulation (Fig. 37.4). This outer sheath used to be made of lead but various types of plastic are now commonly used, particularly PVC. The two insulated conductors in the cable are often twisted together ...
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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.