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CEI 28G-VSR Compliance Kit

Characterize and validate the performance of a CEI 28G-VSR channel design.

CEI 28G-VSR is a common electrical interface (CEI) implementation agreement (IA) that supports 28 Gb/s over "Very Short Reach" (VSR) optical or electrical chip-to-module applications. The CEI 28G-VSR Clause is part of the Common Electrical I/O 3.0 Implementation Agreement.

This kit is designed for analysis of a host board and an optical module. The total channel length is approximately 5 inches. The VSR channel consists of a host board connected with a mated connector to a module board which represents the interconnect between the transmitting and receiving 28.05 Gbps data across the channel. The kit has sheets that represent network characterization for insertion and return loss testing, channel FEXT/NEXT crosstalk to measure BER compliance and RX stress testing.

This kit enables you to insert a channel design and characterize and validate its performance using the specification masks to determine if the channel has a “high confidence” of success. If the channel does not meet the compliance masks or BER estimates, further investigation or redesign, along with simulation, will need to be performed to determine possible changes to meet compliance.

Open CEI 28G-VSR Kit

Open the CEI 28G-VSR kit in the Serial Link Designer app using the openSignalIntegrityKit function.



Kit Overview

  • Project Name: CEI_28G_VSR

  • Interface Name: CEI_28G_VSR

  • Operating Frequency: 28.05 GB/s (UI = 35.75 pS)

The CEI 28G-VSR kit defines two schematic sets. Schematic sheets are included for testing a CEI 28G-VSR channel with mated connector to a module board. The masks provided in this kit are given in the 28.05 Gb/s CEI 28G-VSR specification.

  • Compliance — All compliance host-to-module or module-to-host simulations

  • MCB_HCB_Characterization — Compliance board network simulations.

For more information about the CEI 28G-VSR channel compliance schematics, transfer net properties, and compliance rules, refer to the document CEI_28G_VSR.pdf that is attached to this example as a supporting file.


[1] CEI-28G-VSR Specification. Part of CEI-4.0 specification IA# OIF-CEI-04.0, December 29, 2017.

[2] CEI-25G-LR and CEI-28G-SR Multi-Vendor Interoperability Testing. March, 2012. 2012_OIF_PLL_White_Paper_Feb29.pdf.

[3] CEI-28G:Paving the Way for 100 Gigabit, OIF Forum Whitepaper. John D’Ambrosia, Force10 Networks, David Stauffer, IBM Microelectronics, Chris Cole, Finisar. OIF_CEI-28G_WP_Final.pdf.

[4] IA Title: Common Electrical I/O (CEI) - Electrical and Jitter Interoperability agreements for 6G+ bps, 11G+ bps and 25G+ bps I/O. (IA # OIF-CEI-03.3). OIF_CEI_03.0.pdf, September 1, 2011.

See Also