Design Case Study & Experimental Validation for a 100 Gb/s Per Lane C2M Link Using Channel Operating Margin

Event Time

Originally Aired - Tuesday, August 17 3:00 PM - 3:40 PM

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Event Location

Location: Exec Ballroom 210C

Event Information

Title: Design Case Study & Experimental Validation for a 100 Gb/s Per Lane C2M Link Using Channel Operating Margin

Event Type: DesignCon - Technical Session

Pass Type: All-Access Pass, 2-Day Pass

Theme: Internet of Things (IoT),High-speed Communications,Data Centers


The Chip-to-Module (C2M) interface as specified by the IEEE 802.3 Standard Working Group, and currently being updated for higher data rates, implements links that must perform up to 800 Gb/s (8 × 100 Gb/s) within the internet infrastructure physical layer. The design of these channels requires multiple engineering disciplines that fused together to create a comprehensive workflow. The standard measurements and specifications such as insertion loss, return loss, crosstalk, impedance profile and eye diagram may be no longer sufficient to ensure compliance as well as interoperability. The Channel Operating Margin (COM) is an emerging Figure of Merit (FOM) that incorporates all active and passive components within the channel to allow performance trade-offs to be made by designers.

While COM is a voltage signal to noise ratio, the C2M uses another related figure of merit, the Voltage Eye Closure (VEC), which is the ratio of eye opening to the amplitude of the electrical output. Since the eye opening is the complement to noise VEC it is directly computable from COM and vice versa.

Moving higher and higher in the data rate poses challenges to the applicability of COM/VEC computation for a channel performance design and interoperability compliance evaluation. This paper will characterize a C2M link using advanced simulation and measurement tools to validate the applicability of the design solution explored by COM algorithms. This will confirm its effectiveness without the need to continuously rely on complex, time consuming and expensive measurements, whenever approaching a new C2M channel design.

A typical physical layer channel design, including simulation, measurements and debug, identifies specific challenges with its subsequent potential solutions evaluated by COM.