Proximus forum 523, Mounting And Commissioning Manual

Page: 17 / 228

Features 15
X.31 packet data can be forwarded between two S
0
interfaces (for instance an
internal and external S
0
interface). Equally, data can be forwarded (“routed”)
over permanent Q.SIG lines. It is possible to operate multiple terminals with
the same TEI on different internal S
0
interfaces. A TEI mapping table allows
these X.31 connections to be routed to the same external S
0
interface.
The routing table for X.31 packet data is set in the Configurator under Tele-
phony : Extended : X.31 . Additional information can be found in the Configu-
rator online help files.
Internet Access
It is possible to connect a complete company network (LAN, Local Area
Network) with the Forum 523/524. All work station computers within the
LAN can then access the Internet via the Forum 523/524. If Internet access is
already available from an Internet Service Provider, this can also be
configured in the Forum 523/524. The Forum 523/524 provides the IP
configuration required for Internet access. A DHCP server and a DNS server
are integrated into the Forum 523/524 and these handle the administration
of IP addresses and name resolution for the client computers.
The Forum 523/524 provides Internet access for all connected PCs through a
common IP address. Only this address is externally visible in the Internet.
Network Address Translation (NAT) translates the local IP addresses of the
client computers to the IP address of the Forum 523/524. This means that
the workplace computers in the LAN cannot be directly reached from the
outside (i.e. from the Internet) and are thus protected from direct attack from
the Internet. The LAN is additionally protected by the Forum 523/524 filter
lists, which can be individually configured (Firewall function).
Note: We recommend you read the explanations in Useful Infor-
mation on Internet Access starting on page 84.
E-Mail
An e-mail function, which can use the POP3, APOP or IMAP4 protocols to
check the Internet Service Provider for incoming mail, is integrated into the
Forum 523/524. Mail account retrieval can be configured for each member of
staff when configuring Forum 523/524.
Forum 523/524 then fetches the headers (Subject) and sender information
from incoming e-mails from the mail servers at preset intervals and forwards
them to the user’s system terminal.