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1 Introduction
devices” use only 1.2 Mbit/s. (In this classification, the
AVM ISDN-Controller B1 USB is a fast device on the
USB.) Devices can access the bus in several ways,
including bulk, interrupt, isochronous and control modes.
With these characteristics, the USB seems to be an
outstanding solution to the tangle of cables and interfaces
customary in today’s PCs.
1.3 The AVM ISDN-Controller B1 USB
The AVM ISDN-Controller B1 USB is an external
device connecting the computer to an ISDN line.
The ISDN-Controller B1 USB is simply connected to
the USB socket on the computer or any USB hub. Its S
0
interface is then connected to the ISDN line using the
cable supplied.
The AVM ISDN-Controller B1 USB is an active ISDN-
Controller for the S
0
interface of a basic-rate ISDN line,
and is equipped with a high-performance RISC CPU, one
MB of memory and a USB interface. The B1 USB
simultaneously operates both of the BRI’s B channels (for
user data) and the D channel (primarily for signaling
functions).
The B1 USB is a stable platform for professional users
who want support for all ISDN features. The B1 USB can
be connected directly to the ISDN BRI line, or to a PBX
extension.
The AVM ISDN-Controller B1 USB owes its
extraordinary performance to its active architecture,
which makes this ISDN-Controller the ideal platform for
software applications that demand high data throughput.
One megabyte of on-board memory makes it possible to
load protocol processing and other application software
directly on the controller. This minimizes the burden on
your computer’s memory and processor.
The illustration below shows how the ISDN-Controller
B1 USB installation connects the computer to the ISDN
network terminator (NT).
7


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