Cisco ONS 15800 Series DWDM Platforms

Configuring the RXT Channel Number and Line Direction on an ONS 1580x

Document ID: 20240

Updated: May 23, 2006



This document describes how to set receiving transponders card (RXT) parameters. Line direction and channel number are two variables stored on each RXT card internal memory. Every time a new card is installed in a new node, these two parameters must be correctly configured.

Note: The incorrect setting of these parameters does not affect the optical functionality of the board. Only the monitor and management part of the card is impacted. Wrong performance management (PM) or fault management (FM) values can be collected or set on a particular transponder by the element management system (EMS) if the channel number or line direction are not correctly set.

You can use this procedure to configure these RXT cards models:

  • RXT-10G-F

  • RXT-10G-M

  • RXT-622-N

  • RXT-DM-F

  • RXT-DM-M



Before you apply any command on a particular RXT, try to have a clear layout that describes how to associate RXT cards installed in a particular slot to the Dense Wavelength Division Multiplexing (DWDM) channel that passes through it. The association between DWDM channels and RXT cards is physically determined by the way the cards are patched to the ONS1580x DWDM demultiplexer. The configuration of the RXT board must then reflect the physical patch applied in the system.

Although there are no constraints regarding the slot position for RXT cards, it is a common rule to maintain the same slot position adopted for the wavelength channel module (WCM) WCM transmit transponder cards.


Ensure that you know how to set and change the IP address on a Windows-based PC (such as Windows95, Windows98, WindowsNT, Windows2000). You must also know how to connect to an ONS1580x node using the Cisco Photonics Toolkit (CPTK) configuration tool.

Components Used

The information in this document is based on these software and hardware versions:

  • Cisco ONS15800 (revisions 1.4, 1.5, 1.6 and 2.0.0) and ONS15801 (revisions 1.2,1.3, 1.4 and 2.0.0)

  • A Windows-based PC

  • CPTK version 1.6.3

    Note: There should be no existing problems for different RXT firmware revisions.

You can check the firmware and software compatibility of the different components on the ONS 15800 and 15801 Software and Firmware Matrix.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Related Products

The procedure in this document can be performed on a PC that runs Windows95, Windows98, WindowsNT or Windows2000.


Refer to Cisco Technical Tips Conventions for more information on document conventions.

Set the RXT Channel Number and Line Direction

These steps guide you through a simple RXT cards configuration using the CPTK software tool.

  1. With CPTK connected to the ONS1580x network element (NE) in which the RXT card to be configured is installed. The CPTK main window shows the full NE inventory:


  2. Select the RXT card to be configured. A check sign appears on the left of the selected card:


  3. From the Action menu, select line direction East to West or West to East according to the NE type and setting. This table helps you to determine the right line direction setting for the RXT.

    Note: This is a reference table for standard NE configurations.

    NE Type RXT Line Direction
    Terminal site WEST East to West
    Terminal site EAST West to East
    LEM site West facing side* East to West
    LEM site East facing side* West to East
    OADM site West facing side* East to West
    LEM site East facing side* West to East

    * West or East facing refers to the outgoing signal (transmit to). An easy way to double check the correct line direction chosen for the RXT is that RXT line direction must be the same as the Pre-Line amplifier (PRE-L) from which it gets the signal.


  4. If the line direction setting is successfully applied to the RXT card, a Success confirmation pop-up window appears.


  5. The main CPTK window then shows the RXT card with the correct line direction displayed.


  6. Select the RXT card for the channel number configuration. Select the RXT Identifier option from the Action menu.

    A pop-up dialog window appears.


  7. Scroll using the mouse or manually insert the Channel number to set on the RXT card. Press OK.


  8. Wait until the progress gauge arrives to 100 percent and an Operation Completed pop-up window appears, then press OK.


  9. A Warning window appears, asking if you want to commit the changes to the RXT cards.

    There are three possibilities:

    • Reset the RXT—This affects the traffic carried by the unit. This is the preferred method if the channel is not in service yet (for instance, during the installation phase).

    • Reset the Cellular MultiProcessing (CMP) card—This affects the supervision (Cisco Photonics Local Terminal [CPLT] and Cisco Transport Manager [CTM]) on the system node for the time taken by the reset process. This is the preferred method if the channel is already in service and carries traffic.

      Note: If more than one RXT or other card needs to be configured simultaneously in the same node, a CMP reset at the end of all the operations is preferred, since this minimizes supervision interruption.

    • Skip—No change is actually committed to the RXT card. The changes are visible only after the next CMP reset.


    After either an RXT or CMP reset, the channel number is displayed at the end of the RXT module name.

Verify the RXT Line Direction and Channel Number Setting

This section provides information you can use to confirm your configuration works properly.

The Output Interpreter Tool (registered customers only) (OIT) supports certain show commands. Use the OIT to view an analysis of show command output.

If the RXT is correctly configured, the correct line direction setting must appear on the left of the module name:

  • EW means East to West

  • WE means West to East

If an NA label is displayed, this means that the card does not have any line direction associated with it. The channel number must appear at the end of the module name.

Troubleshoot the RXT Configuration

Refer to the standard layouts of the ONS1580x system to verify the RXT configuration for a particular RXT. This does not guarantee that the entire standard layout has been respected during the installation phase. An on-site check of all the patching between the DWDM system demultiplexer and the RXT cards is the preferred method in case of signal flowing and channel assignment problems.

Related Information

Updated: May 23, 2006
Document ID: 20240