7
Features
OpenCom 100 (only national setting
“Germany”). If Internet access is al-
ready available from an Internet
service provider, this can be config-
ured in the OpenCom 100. If the cli-
ent network is not IP-capable, the
OpenCom 100 can administer the IP
configuration necessary for Internet
access. The OpenCom 100 has an in-
tegrated DHCP server and a DNS
server, which in this case take over IP
address administration and name
resolution for the client PCs.
The OpenCom 100 enables Internet
access for all connected PCs by
means of a common IP address. Only
this is externally visible. The local IP
addresses of the client PCs are trans-
lated to the IP address of the
OpenCom 100 by network address
translation (NAT). In this way the cli-
ent PCs in the LAN cannot be
reached directly from the Internet.
This protects them from direct exter-
nal attack. The LAN is additionally
protected by the OpenCom 100 filter
lists, which can be customised indi-
vidually (firewall function).
Note: We recommend you to read
through the explanations under Use-
ful Information on Internet Access
starting on page 70.
DECT Data Communication
A USB DECT Box or the
OpenPhone 25 DECT terminals ena-
ble PCs that are not connected to the
OpenCom 100 via the internal S
0
ports or the Ethernet interface to ac-
cess the Internet. These PCs can
make full use of all the Internet and
e-mail features of the OpenCom 100.
Data is transmitted via the internal
data interface of the OpenPhone 25,
which must be connected to the se-
rial port of the PC by means of the
supplied adapter. The Internet can
then be accessed directly via the re-
mote data transfer (i.e. dial-up) net-
work. The OpenPhone 25 sets up a
data connection with the
OpenCom 100 via the DECT air inter-
face. The remainder of the connec-
tion set-up is either direct - through
an ISDN B-channel - or indirect -
through the internal RAS access of
the OpenCom 100. Indirect RAS ac-
cess is preferable. This uses the rout-
ing function of the OpenCom 100
and thus also the security features of
the shared Internet access.
Using the USB DECT Box obtainable
as an add-on, it is possible for a PC to
establish a wireless (DECT) ISDN data
connection. This USB DECT Box is
connected to the PC via the USB
port.
For detailed information on the in-
stallation of the required driver soft-
ware and the various types of con-
figuration, refer to USB DECT Box on
the OpenCom 100 starting on
page 109 and to the user guide for
the OpenPhone 25.
For information on configuration of
the OpenPhone 25 with a data inter-
face, please refer to the online help