Main Content

CEI 25G-LR Compliance Kit

Characterize and validate the performance of a CEI 25G-LR channel design.

CEI 25G-LR is a common electrical interface (CEI) implementation agreement (IA) that supports 25 Gb/s over "Long Reach" (LR) backplane architectures. The CEI-25G-LR Clause is part of the Common Electrical I/O 3.0 Implementation Agreement.

This kit is designed for analysis of a backplane channel design between module boards. The total channel length is approximately 30 inches. It has module boards connected with two mated connectors which represents the interconnect between ASICs transmitting and receiving 25 Gb/s data over the channel. The kit has three sheets: one for single channel BER compliance testing, one for multi-channel FEXT/NEXT crosstalk to measure BER compliance and a sheet for simulating network characteristics for compliance.

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 25G-LR Kit

Open the CEI 25G-LR kit in the Serial Link Designer app using the openSignalIntegrityKit function.

openSignalIntegrityKit("CEI_25G_LR");

Kit Overview

  • Project Name: CEI_25G_LR

  • Interface Name: CEI_25G_LR

  • Operating Frequency: 25.8 Gb/s (UI = 38.75 ps)

The CEI 25G-LR kit defines one schematic set. Schematic sheets are included for testing a CEI 25G-LR channel with mated connectors, and a cable/backplane with two plug-in cards. The masks provided in this kit are given in the 25 Gb/s CEI_25G_LR specification

  • Default – Schematic sheets focused on channel characterization and BER compliance

For more information about the CEI 25G-LR channel compliance schematics, transfer net properties, and compliance rules, refer to the document CEI_25G_LR.pdf that is attached to this example as a supporting file.

See Also