In the
1980s the
telecommunications industry conceived that digital services would follow much the same pattern as voice services, and conceived a grandiose vision of end-to-end
circuit switched services, known as the Broadband Integrated Services Digital Network (B-ISDN). This was conceived in the
1990s as a logical extension of the end-to-end circuit switched data service,
ISDN.
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An Integrated Services
Digital Network (
ISDN) offering broadband capabilities. Note 1: B-ISDN is a
CCITT-proposed service that may (a) include interfaces operating at
data rates from 150 to 600 Mb/s, (b) use
asynchronous transfer mode (ATM) to carry all services over a single, integrated, high-speed
packet-
switched network, (c) have LAN
interconnection capability, (d) provide
access to a remote, shared disk
server, (e) provide voice/
video/data teleconferencing, (f) provide transport for programming services, such as
cable TV, (g) provide single-
user controlled access to remote video sources, (h) handle voice/video telephone calls, and (i) access shop-at-home and other
information services. Note 2: Techniques used in the B-ISDN include
code conversion, information compression, multipoint connections, and multiple-
connection calls. Current proposals use a service-independent
call structure that allows flexible arrangement and
modular control of
access and transport edges. The service components of a connection can provide each
user with independent control of access features and can serve as the basis of a simplified control structure for multipoint and multiconnection calls. Such a
network might be expected to offer a variety of ancillary
information processing functions.
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