Omni.Net Lite User’s Guide

 

Table 5 RS-232 Port: Local DN and Call Type

 

 

 

 

LABEL

DESCRIPTION

 

 

 

 

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

Select a value between 128 and 2048 to change the sending frame size.

 

Size (bytes)

The default sending frame size is 254 bytes.

 

 

 

 

 

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.

Chapter 2 Using the Utility

32