Transmitter Tuning Guide for Untrained 25/50/100G NRZ Links
Content Type: Product Information & Documentation | Article ID: 000099289 | Last Reviewed: 07/09/2024
Intel® Ethernet network controllers and adapters support a wide range of link modes over different media interfaces. This document provides guidelines on transmitter tuning for Chip-to-Chip (C2C) and Chip-to-Module (C2M) links on Intel® Ethernet network controllers supporting 25G-based single and multi-lane link modes. The Physical Media Dependent (PMD) segment function supporting C2C and C2M links does not use link training (in contrast to the backplane and direct-attach copper media, which do). Therefore, for link robustness, manual transmitter equalization adjustment is needed, which requires knowledge of the transmitter equalization parameter ranges and channel loss between transmitter output and receiver input pins.
This application note includes examples of common link topologies requiring transmitter equalization tuning and a heuristic approach for rapid adjustment.
Note: Intel® Ethernet adapters are not addressed in this document since they are supplied with port-specific transmitter settings from the Intel factory.
Transmitter Tuning Guide for Untrained 25/50/100G NRZ Links Application Note