August 2001
Beginner
304 pages
10h 3m
English
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Glossary
When visiting another country, the first task is to learn the language. Telcos are a foreign realm for many data networkers. They have different customs, attitudes, and a different language. This glossary should help you talk the talk and look up terms quickly when necessary.
A
- AIS
Alarm indication signal. AIS is also known as the blue alarm. When no incoming signal is detected, a CSU/DSU transmits an unframed all-ones pattern to the network to maintain synchronization and announce its presence to the network.
- ACCM
Asynchronous control character map.
- AMI
Alternate Mark Inversion. An encoding scheme, also known as bipolar return to zero, in which one bits (marks) are transmitted as pulses and zeros (spaces) are indicated by the absence of a pulse. Pulses alternate in polarity.
- ANI
Automatic Number Identification. A similar service to CLID, which transmits the number of the calling party.
- asynchronous
Data transmission that relies on the endpoints to send explicit stop and start instructions. While easier to do than synchronous transmission, the overhead of start and stop messages makes it impractical for high-speed links.
B
- B8ZS
Bipolar with 8 Zero Substitution. An encoding scheme that replaces eight zeros with intentional bipolar violations. Eight zeros are replaced with a code that has two intentional bipolar violations. The substitution takes the form 000V10V1, where V is a pulse of the same polarity as the previous pulse. B8ZS enables clear channel transmission because it ensures ...
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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.