X.28 Configurable PAD Options

The X.28 Configurable Packet Assembler Disassembler (PAD) Options feature provides a configurable option to prevent the padding character from being sent to the Point of Sale (POS) terminal. The ability to not to send the padding character is required as there are some POS terminals that are incompatible with X.28 padding as specified by the ITU-T standard. ITU-T standard section 3.5.2 specifies that the padding character is sent when the terminal operates at a speed below 9600 bps.

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Information About X.28 Configurable PAD Options

X.28 Configurable PAD Options Overview

X.28 enables Packet Assembler Disassembler (PAD) system administrators to dial in to X.25 networks or set PAD parameters using the X.28 standard user interface. X.28 adheres to the X.28 ITU-T standards.

The X.28 interface is designed for asynchronous devices that require X.25 transport to access a remote or native asynchronous or synchronous host application. For example, dialup applications can use the X.28 interface to access a remote X.25 host. X.28 PAD calls are often used by banks to support applications in the back office such as ATM machines, Point of Sale (POS) authorization devices, and alarm systems. An ATM machine may have an asynchronous connection to an alarm host and a Cisco device. When the connection is broken, the alarm host sends a distress call to the authorities through the Cisco device using an X.28 PAD call.

The X.28 PAD Configurable PAD Options feature provides an option to prevent the padding character from being sent when an asynchronous device connects at any access speed below 9600 bps. The ITU X.28 recommends different padding character combinations depending on the speed. The option prevents the padding character from being added to a POS terminal that accepts 0 padding at a lower speed. The x28 command is enhanced to support this feature.

How to Configure X.28 PAD Options

The X.28 Configurable Packet Assembler Disassembler (PAD) options feature provides a configurable option to prevent the padding character from being sent to the Point of Sale (POS) terminal. This section describes how to configure the X.28 PAD options. You can configure X.28 PAD options in privileged EXEC mode or in line configuration mode.

Configuring X.28 PAD Options in Privileged EXEC Mode

SUMMARY STEPS

    1.    enable

    2.    x28 no-padding


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 x28 no-padding


    Example: 
    Device# x28 no-padding
     

    Ignores X.28 ITU-T section 3.5.2 for padding and prevents the padding character from being sent to the Point of Sale (POS) terminal.

     

    Configuring X.28 PAD Options in Line Configuration Mode

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    line aux 0

      4.    modem InOut

      5.    autocomand x28 no-padding

      6.    speed data-rates

      7.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example: 
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example: 
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3 line aux 0


      Example: 
      Device(config)# line aux 0
       

      Configures the auxiliary line with the line number and enters line configuration mode.

       
      Step 4 modem InOut


      Example: 
      Device(config-line)# modem InOut
       

      Configures the auxiliary line for incoming and outgoing use of modem.

       
      Step 5 autocomand x28 no-padding


      Example: 
      Device(config-line)# autocommand x28 no-padding
       

      Ignores X.28 ITU-T section 3.5.2 for padding and prevents the padding character being sent to the Point of Sale POS (POS) terminal.

       
      Step 6 speed data-rates


      Example: 
      Device(config-line)# speed 1200
       

      (Optional) Specifies the speed in megabits per second (Mbps) for the packets on the auxiliary line.

       
      Step 7 end


      Example: 
      Device(config-line)# end
       

      Exits line configuration mode and returns to privileged EXEC mode.

       

      Configuration Examples for X.28 Configurable PAD Options

      Example: Configuring the X.28 PAD Options

      The following example shows how to configure X.28 PAD options in line configuration mode: 

      Device> enable
Device# configure terminal
Device(config)# line aux 0   
Device(config-line)# modem InOut
Device(config-line)# autocommand x28 no-padding
Device(config-line)# speed 1200
Device(config-line)# end

      The following example shows how to configure X.28 PAD options in privileged EXEC mode: 

      Device> enable
Device# x28 no-padding

      Additional References for X.28 Configurable PAD Options

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Cisco IOS Master Command List, All Releases

      Wide-Area Networking commands

      Cisco IOS Wide-Area Networking Command Reference

      X.25 and LAPB configuration

      "Configuring X.25 and LAPB" in the Cisco IOS Wide-Area Networking Configuration Guide

      MIBs

      MIB

      MIBs Link

      None

      To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

      http:/​/​www.cisco.com/​go/​mibs

      Technical Assistance

      Description

      Link

      The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

      http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

      Feature Information for X.28 Configurable PAD Options

      The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

      Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

      Table 1 Feature Information for X.25 Data Display Trace

      Feature Name

      Releases

      Feature Information

      X.28 Configurable PAD Options

      15.4(1)T

      The X.28 Configurable Packet Assembler Disassembler (PAD ) Options feature provides a configurable option to prevent the padding character from being sent to the Point of Sale (POS) terminal.

      The following command was introduced: x28 padding.