User's Manual

(4) xDSL Interface
If NetServer is connected on xDSL line and needs PPPoE process, administrator should select
network interface as ‘ xDSL (PPPoE)’ . And administrator should configure user ID and password
for PPPoE. ID and password may be acquired from the ISP that installed the line. And NetServer
may get IP address when it is connected on xDSL line.
(5) PSTN Interface
If NetServer is to be connected on Internet through PSTN (Public Switched Telephone Network)
based on PPP, administrator should select network interface as ‘ PSTN (Dial-out)’ . This interface is
for NetServer to connect to ISP through telephone line for Internet connection. In this case,
NetServer is connected to dial-up modem with a serial cable unlike other interfaces such as
‘ Ethernet’ or ‘ xDSL (PPPoE)’ . With these interfaces, NetServer is connected with LAN cable.
The information to configure in this page is similar to that you configure on your PC to connect to
Internet through telephone line. And it is used when NetServer dials up to ISP and make Internet
connection based on PPP, while the contents on a PC is used when the PC dials up to its ISP and
make Internet connection based on PPP. Normally, ISP set it on your PC the information for
connection so that your PC makes progress to the ISP. And the script sometimes differs according
to each ISP.
There are two methods for users to access NetServer through PPP connection. And being seen from
NetServer, one is that NetServer dials out and the other is that NetServer is dialed in through dial-up
modem.
PPP (Point-to-Point Protocol)
PPP is a protocol for communication between two computers using a serial interface,
typically a personal computer connected by phone line to a server. For example, your
Internet server provider may provide you with a PPP connection so that the provider's server
can respond to your requests, pass them on to the Internet, and forward your requeste
d
Internet responses back to you. PPP uses the Internet protocol (IP) (and is designed to handle
others). It is sometimes considered a member of the TCP/IP suite of protocols. Relative to
the Open Systems Interconnection (OSI) reference model, PPP provides layer 2 (data-lin
k
layer) services. Essentially, it packages your computer's TCP/IP packets and forwards them
to the server where they can actually be put on the Internet.
Dial-out and Dial-in
Dial-out is that NetServer connects to ISP to get Internet connection based on PPP. When ISP
makes PPP connection with NetServer, ISP assigns an IP address to NetServer.
Dial-in is that a user’ s PC connects NetServer and NetServer provides PPP connection to the
PC based on PPP. In the case of dial-in, NetServer acts as ISP against to a user’s PC. When
NetServer makes PPP connection with a PC, NetServer assigns an IP address to the PC.