November 2007
Intermediate to advanced
736 pages
46h 32m
English
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INTEGRATED SERVICES DIGITAL NETWORK (ISDN)
Integrated services digital network is a single network able to carry and switch a wide variety of telecommunication services, voice, video, data or packets over the public switched telephone network (PSTN). It is expected to evolve from an IDN, an integrated digital network, which is a telephony network in which digital transmission systems have been fully integrated with switching systems (Fig. 42.12).
ISDN is a service offering that extends access to digital transport facilities and to the signalling network. Access to the digital transport facilities occurs on 64 kbps (B) channels while access to signalling network occurs on 16 or 64 kbps signalling (D) channels (Fig. 42.13).
Two levels of digital ...
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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.