Lucent Technologies 6000 用户手册

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MAX 6000/3000 Network Configuration Guide

Configuring X.25
Setting up ISDN D channel X.25 support

This section discusses support of nailed X.25 connection over the D channel, but T3POS, 
X25/PAD, X25/IP, X25/PPP, and X25/MP (AO/DI) protocols are also supported over any 
channel that supports nailed X.25 connections (for example, B channel and serial WAN).

To configure the MAX to support X.25 over the signaling D channel:

Open Ethernet > X25 > any X25 profile.

Set TEI to the value specified by your X.25 carrier.

You can set TEI to any value from 1 to 63 for fixed TEI. The default is 21. If you set TEI 
to 0 (zero), the MAX will use a TEI assigned by the network. 

Set Call Type to D channel.

Exit the profile and, at the exit prompt, select the exit and accept option.

MAX units with X.25 support X25 Transaction Processing Protocol for Point-of-Service 
(T3POS), which can be used to send point-of-sale (POS) data over the ISDN D channel. 
T3POS is a character-oriented, frame-formatted protocol designed for POS transactions 
through an X.25-based packet switched network. T3POS enables you to send data over the 
ISDN D channel while continuing to send traffic over both B channels. The T3POS protocol 
involves three parties: the T3POS DTE (DTE), the T3POS PAD (PAD) and the T3POS Host 
(host), as shown in Figure 6-6. 

A typical use of T3POS is performing credit card authorization over the D channel while using 
the B channels to transmit inventory control data and other traffic. Figure 6-7 shows an 
example of a T3POS setup.