Overview

As the signal transmission rate or frequency increases, the high-frequency components in the signal attenuate more severely. Common signal compensation techniques such as pre-emphasis and equalization are used to improve signal transmission performance. Pre-emphasis amplifies high-frequency components but increases the likelihood of crosstalk. Equalization is introduced to filter out high-frequency crosstalk at the receiving end. After the link training function is enabled, the sending and receiving ends exchange pre-emphasis and equalization parameters across frames automatically. The function improves the process efficiency of pre-emphasis and equalization, ensuring the stability and reliability of the transmitted signal.

Configuration Notes and Constraints

When configuring the link training function, pay attention to the following notes:

• Currently, only the switch platform of Tomahawk3 supports this function.

• The link training function is supported only when the port is inserted into the Direct Attach Cable (DAC) module.

• When using the link training function, ensure that the function is enabled on the interfaces at both ends of a link. Otherwise, the function cannot work.

Procedure

Step 1 Configure the link training function on an interface.

Step 2 Commit the configuration.

Configuration Example

• Enable the link training function on the interface xe-1/1/1.