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User’s Guide
Establishing Links for THGm
The THGm is often connected to a device that cannot auto negotiate the connection,
such as when monitoring/analyzing a connection through a tap device. The device
will automatically go through a sequence of attempts to disable auto negotiation and
establish a link with a device that cannot auto negotiate. However, if a link cannot
be automatically established with a device, you can attempt to establish a link
manually by disabling auto negotiation mode. The
Fiber Link option from the
Module menu allows you to disable auto negotiation and alert the module to begin
listening for data. Make sure the
No Auto Negotiation item is selected from the menu.
Auto negotiation enabled is the default value.
The
Module menu also has a Fiber Link → Link Status option which provides
information about a 1000 Mbps link. If the carrier wave is present, this option
returns a “link OK” message. If there is a problem with the link, a message screen
appears with diagnostic information that may help you troubleshoot the link.
The “link OK” message is returned if the device can sense the carrier wave on its
receive port. However, if a THGm has a proper physical connection to a device that
cannot auto negotiate the connection, this option will report that the link is OK even
though the devices do not recognize each other. The
Link Status option is of limited
use when connecting to devices such as taps where the problem is an auto
negotiation failure.