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30
Connecting to a Computer/Printer
Connecting to a Computer/Printer
PC with Intel Pentium 266 or compatible processor
Windows 95,98, Windows Me, Windows 2000, Windows XP, Win-
dows NT 4.0 with service pack 3 or later
but: Windows 98 SE, Windows Me, Windows 2000, Windows XP if
you use USB interface
RAM memory
for Windows 95/98/M2: 32 MB, 64 MB recommended
for Windows 2000/XP/NT: 64 MB, 128 MB recommended
The connection of the PBX to an existing USB interface is made with the
included USB cable with two different plugs at both ends. It depends on
how many devices you like to connect to your PC, you are able to con-
nect the PBX to a hub directly to the PC (you will find more details about
it in the
chapter General Information on USB on page
is plugged into the master device (PC or hub) and the other plug into the
PBX.
If you connected the PBX to your PC, the „Add new Hard-
ware" assistant of Windows will be started automatically to
support you when you install the necessary driver. Consult the
description of the Auerswald USB driver installation in your CAPI/TAPI
manual.
The LEDs of the PBX will show you information about the USB connec-
tion (see
page
53).
General Information on USB
The USB (Universal Serial Bus) is a serial bus system that connects dif-
ferent device types. Starting at the root hub, which the PC provides, the
USB is set up in several levels (up to 5) with the so-called hubs (distrib-
utors) and the USB devices (up to 127 units).
Hubs are connected to the USB port of the PC or to the outputs of the
preceding hubs. They work as receiver of signals of the PC and of pre-
ceding hubs as well as sender of signals to further hubs and to con-
nected devices. The old and existing PC interfaces (parallel, serial...)
can now be replaced by only one.
Another advantage of this system is the possibility of Plug-and-Play. In
order to start operation of USB devices, it is not necessary anymore to
open the PC and perform a complicated configuration. The device is
simply connected to the existing bus and the corresponding drivers are
installed on the PC. The unit will be ready for use at once. The Plug-
and-Play compatible operating system Windows is essential for the PC.
(e.g. Windows 98 SE).
There are two speed classes of USB devices – „full speed" (12 MBit/s)
and „low speed" (1,5 MBit/s). Due to the different data transfers rates
different cable types and lengths for these both types of units are in use.
For „full speed" devices such as this PBX only USB cables with a max-
imum length of 5 m are used.
There is another distinctive feature for the USB devices concerning the
power supply. Self powered units such as the PBX supply themselves
via an own power supply so that the USB power is not used. In contrast
to this bus powered devices have to be supplied via the USB. These
devices have the power supply classes „high powered" (up to 500 mA)
and „low powered" (up to 100 mA). The USB is able to deliver a power
supply up to a maximum of 500 mA for devices.
Minimum Requirements for the PC
Connection via the USB Interface
30). The flat plug
USB interface (if used) according to USB specification 1.1
CD-ROM drive
Mouse or compatible pointer device.
SVGA graphic board with 800*600 resolution and 256 colours/grey
scales 32768 colours recommended
Pic. 34: Connection:
USB interface
C O M p a c t
· · · · 2 1 0 4 · · · ·
Power
Up-
S ext.
Tn31
Tn32
Tn33
Tn34
PC
Display
0
date
Audio
Pic. 35: USB
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