May 2012
Intermediate to advanced
720 pages
23h 31m
Polish
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Rozdział 21. T1
W latach 50. ubiegłego stulecia jedyną metodą łączenia linii telefonicznych było zastosowanie jednoparowego przewodu miedzianego. Każda linia telefoniczna wchodząca do budynku wymagała jednej pary miedzianych kabli. Przeciążenia przewodów stanowiły w tym czasie ogromny problem w centralnych biurach (ang. central offices — CO) korporacji telefonicznych oraz w podziemnych tunelach kablowych na obszarach miejskich. Wyobraź sobie CO w sporym mieście, gdzie zbiegają się dziesiątki tysięcy linii telefonicznych, z których każda wymaga pary przewodów. Biura te musiały jeszcze komunikować się między sobą, co wymagało dodatkowego okablowania.
W roku 1961 laboratoria Bell Labs z New Jersey wynalazły łącza T1 jako narzędzie do cyfrowego trunkingu ...
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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.