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X.25 enables retail store devices to access the X.25 networks of bank credit card verification systems. This release note describes the features and caveats for Cisco 700 series router software Release 4.1(2) X.25, which supports X.25 over the ISDN B channel.
This document includes the following sections:
Cisco 700 series router software Release 4.1(2) X.25 supports the following routers:
| Cisco 760 Series | Cisco 770 Series | CPA760 Series |
|---|---|---|
| Cisco 761 | Cisco 771 | CPA761 |
| Cisco 762 | Cisco 772 | CPA762 |
| Cisco 765 | Cisco 775 | CPA765 |
| Cisco 766 | Cisco 776 | CPA766 |
The filenames for the X.25 image are C760-in.rx-NET3.41-2.bin (Remote Office) and C760-in.rx-NET3.41-2.bin (Internal Ready). The DOS filename for the X.25 image is 80206501. The image requires 1.5 MB of DRAM.
For this release, only Cardway TPAD services (British Telecom) are supported. (The connection is made through the Cisco 700 series router serial port.) These commands are limited to the X.25 release of the software and is not documented in the standard product documentation.
Use the set x25 command to set the virtual circuit ranges. This command is only available for X.25 support with NET3 software.
SEt X25 [LIc | HIc | LTc | HTc | LOc | HOc] vc_numberLIc | Lowest in-coming virtual circuit number. |
|---|---|
| HIc | Highest in-coming virtual circuit number. |
| LTc | Lowest two-way virtual circuit number. |
| HTc | Highest two-way virtual circuit number. |
| LOc | Lowest out-going virtual circuit number. |
| HOc | Highest out-going virtual circuit number. |
| vc_number | Virtual circuit number. Valid value ranges are from 0 to 4095 |
The default values for LIc, HIc, LTc and HTc are 0. The default value for LOc and HOc is 1024.
System level
When upgrading the router software, it is recommended that you issue the set default command, so the X.25 default values are set properly. When changing the virtual circuit ranges, the value(s) are not be effective until the router is rebooted.
The router verifies that the highest virtual circuit number is larger than the lowest virtual circuit number. Therefore it is mandatory that the highest virtual circuit number to be set first (as shown in the example below).
Host> set X25 hoc 1024 Host> set X25 loc 1024
SHow X25
To display the X25 parameters, use the show X25 command.
SHow X25None
System or profile level
This command is only supported with the X.25 for NET3 software. The output shows whether or not X.25 was initialized properly, the MODE of operation, and the virtual circuit ranges.
Host> show x25 X25 is running in DTE MODE. VC Ranges - current value (new value after reboot): lic 0 (0), hic 0 (0), ltc 0 (0), htc 0 (0), loc 1024 (1024), hoc 1024 (1024)
The set serial_port command toggles the serial port function as a configuration port or a TPAD port:
set Serial_Port TPAD | ConfigFor example, the following command sets the serial port to be a TPAD port.
Host> set serial_port tpad
When the port is set to TPAD, communications from a configuration terminal to the serial port are no longer possible. Configuration commands can be entered by using Telnet.
To switch from TPAD mode to CONFIG mode, you can do one of the following:
None
System mode
X.25 for the Cisco 700 series router is not configurable. This implementation of the X.25 is strictly to support TPAD. The X.25 fixed parameters required by the TPAD protocol are as follows:
LAPB (Link Access Procedure, Balanced)
X.25
NUI (Network User Information) and NUA (Network User Address) are supported as described in British Telecom CardWay 0800 Phase 3 Access Platform specification.
X.28 and other X.25 PADs (Packet Assembly Disassembly) are not supported. There is no protocol sensing provision.
The call direction is dial-out only. Incoming calls and two-way calls are not supported.
The set tpad parity command was added to allow serial port communications for TPAD to be changed. (In software Release 4.1(1) serial port communication was limited to 8 data bits, 1 stop bit, and no parity.) The command allows you to change the data bits and parity. This command is limited to the X.25 release of the software and is not documented in the product documentation.
To select the communications parameters for TPAD, use the set tpad parity command.
SEt TPad PArity EVen | ODd | NoneEVen | 7 data bits, 1 stop bit, even parity |
|---|---|
| Odd | 7 data bits, 1 stop bit, odd parity |
| None | 8 data bits, 1 stop bit |
None
System mode
To display the TPAD parity, use the show tpad command.
SHow X25None
System or profile level
The output shows the parity of TPAD.
Host> show tpad TPAD Serial Port Parity: NONE
The information in this release note is not documented in the Cisco 700 Series Command Reference, the Cisco 700 Series Installation Guide, or in any other product-related document.
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