Allied Telesis Converteon AT-CV5000- User Manual
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Chapter 1: Overview

Converteon™ Line Cards

Link Test

MissingLink™

Note

For a current list of line cards for the Converteon™ Series Chassis, refer to the Allied Telesis web site or consult your authorized sales representative. For detailed descriptions of these line cards, refer to the documentation shipped with the line cards and/or the

Converteon™ Media Converter Line Cards Reference Guide.

On some Converteon™ line cards, you can enable or disable the following features by configuring their DIP switches:

Link Test

MissingLink™ Mode

Smart MissingLink Mode

OAM Capabilities

The link test is a fast and easy way for you to test the connections between the converter ports and the end nodes that are connected to the ports. If a network problem occurs, you can perform a link test to determine which port is experiencing a problem, and therefore focus your troubleshooting efforts on the cable and end node where the problem resides.

The LK LED for the twisted pair port should be green, indicating that it was able to establish a link with its end nodes. If the LK LED is off, the port could not establish a link. Refer to “Troubleshooting” on page 95 for suggestions on how to remedy the problem.

For more information on how the LK LED functions, refer to Appendix A in the Converteon™ Media Converter Line Cards Reference Guide.

Performing a link test does not interfere with a converter’s ability to pass network traffic.

The MissingLink™ feature enables the ports on the media converter to pass the link status of their connections to each other. When the media converter detects a problem on one of the ports, such as the loss of connection to an end node, the media converter shuts down the connection to the other port, thus notifying the end node that the connection has been lost.

For example, if the twisted pair cable to the 10/100Base-TXport on the media converter fails, the line card drops the link on the100Base-FXfiber optic port. In this way, the media converter notifies the end node connected to the fiber optic port that the connection on the twisted pair

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Smart

MissingLink

OAM

Line Card Port

Descriptions

AT-CV5000Media Converter Chassis Installation Guide

port has been lost. If the failure occurs on the fiber optic cabling, the line card drops the link to the twisted pair port.

Some devices can be configured to take a specific action in the event of the loss of connection on a port, to seek a redundant path to a disconnected end node, or to send out a trap to a network management station, and so alert the network administrator of the problem.

The Smart MissingLink feature performs exactly the same function as MissingLink™ with one additional feature. When a link is lost on a port, the LK LED of the port that still has a valid connection to its end node starts to blink. This allows you to quickly determine which port still has a valid connection (LK LED blinking) and which port has lost its connection (LK LED is off).

For example, if the network twisted pair cable to the 10/100Base-TXport on the media converter fails, the LK LED on the100Base-FXfiber optic port blinks, indicating a failed connection on the twisted pair port. If the failure starts with the fiber optic cabling, the LK LED on the twisted pair port blinks.

This allows you to quickly see which port has failed and troubleshoot your network accordingly.

The Operation, Administration and Maintenance (OAM) is a group of functions that provides tools and utilities used to manage a network. The OAM feature is 802.3ah-compliantand is used to provide network indication, system configuration, performance monitoring, security management, diagnostic functions and configuration. OAM is described in detail in theAT-S70 Management Software User’s Guide.

For a detailed description of each Converteon™ line card, refer to the documentation shipped with the line card or the Converteon™ Media Converter Line Cards Reference Guide.

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