ZyXEL Communications ISDN Terminal Adapter Omni.Net Lite - Manual (Page 33)

Omni.Net Lite User’s Guide
Chapter 2 Using the Utility 32
2.5 RS-232 Port: PPP/MP Parameters
This section shows you how to configure PPP or MP parameters.
2.5.1 Link Authentication
After a link is established, it is necessary to authenticate the peer for security reasons. There
are two popular authentication methods. One is Password Authentication Protocol (PAP) and
the other is Challenge Handshake Authentication Protocol (CHAP). PAP is less secure
because it transmits the username/password in plain text form. Unlike PAP, CHAP transmits
the username/password in encrypted form. Some ISPs may support CHAP as the only method
for authentication.
2.5.1.1 Windows Authentication
For those applications that do not support CHAP, the TA converts CHAP into PAP. It is
recommended that you select Allow unsecured password in the Dial-up Connection
Property Security screen on Windows 2000/XP or do not select the Required encrypted
password checkbox in the Dial-up Connection Property Server Types screen on
Windows 95/98 by right-clicking on the dial-up connection icon (see the figures below), since
Microsoft uses MS-CHAP for username and password encryption but MS-CHAP is not
supported by most ISPs.
Call Type Sets the calling protocol for the your TA. The protocol selected should match
the protocol in use by the device or network your ISDN TA is calling.
Select HDLC transparent to apply HDLC on B-channels and allow peer to
peer communication similar to what a modem does.
Select X.75 or V.120 to do CRC (Cyclic Redundancy Check) error detecting
on B-channel. X.75 performs error correction using LAPB (Link Access
Procedure Balanced) and V.120 uses LAPD (Link Access Procedure on the D
Channel).
Select PPP or MLP for modem-like dial-up connection to the Internet and/or
combining two B-channels into one.
Select V.110 to allow rate adaption between sync 64 kbps B-channel and
async 9.6 - 115.2 kbps DTE.
X.75 Setup
Transmitting Frame
Size (bytes)
Select a value between 128 and 2048 to change the sending frame size.
The default sending frame size is 254 bytes.
Table 5 RS-232 Port: Local DN and Call Type
LABEL DESCRIPTION