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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