June 2007
Intermediate to advanced
600 pages
18h 19m
English
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Line Coding
DS-3 links support Alternate Mark Inversion (AMI), Bipolar Three Zero Substitution (B3ZS), and High-Density Bipolar Three (HDB3) line coding. AMI is the same as the AMI used on T1s, discussed in Chapter 20. B3ZS is similar to B8ZS, also discussed in Chapter 20, except that it replaces occurrences of three rather than eight consecutive zeros with a well-known bipolar violation. HDB3 is used primarily in Japan and Europe. The default line coding on Cisco DS3 interfaces is B3ZS. When using channelized DS3s, the line coding may be AMI, depending on how the circuit was ordered. Usually B3ZS is preferred.
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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.