November 2007
Intermediate to advanced
736 pages
46h 32m
English
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THE BORSCHT FUNCTIONS
The interface with the subscriber's line is at present the costliest part of all digital exchanges, largely because a 10000 lines exchange has to have 10000 of these units, each with all the features needed to inter work with various types of subscribers' lines. It is customary to describe these features as the BORSCHT functions, based on the initials of the key words.
- Battery feed to line – there is normally no active power source at the subscribers' telephone; all the power, needed to drive the microphone and keypad, is fed out from the exchange along the subscriber's line.
- Overvoltage protection – solid-state devices are very sensitive to high voltages, and rapid-action protective devices have to be provided in each ...
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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.