D9050CEIC OIF-CEI-112G

D9050CEIC OIF-CEI-112G

Data Sheets

Introduction

 

The Optical Internetworking Forum – Common Electrical Interface (OIF-CEI) defines a series of related 112Gb/s electrical standards supporting several interconnect channel lengths. Very Short Reach (VSR), Medium Reach (MR) and Long Reach (LR) specifications are leveraged widely in high speed optical and electrical interconnect strategies where tradeoffs in channel length, power consumption and error rate are balanced with product needs.

Several industry and standards bodies have defined specifications for 100 Gb/s high speed electrical interface using PAM4 coding. As an example, an implementation agreement (IA) developed by the Optical Internetworking Forum – Common Electrical Interface (OIF-CEI) defines 112 Gb/s operation in OIF-CEI 112G using 53b/56b PAM4 signaling (CEI-112G-VSR/MR/LR).

The Keysight D9050CEIC measurement solution offers users result accuracy and consistency in measurement techniques tracking to the OIF-CEI 112Gb/s standards. The OIF-CEI 112G standards dependency on adaptive reference equalizer demands tool automation for traversing the CTLE and DFE solutions grid in finding the optimized filter coefficients within bounds stipulated by these standards. The automation of this process along with the ability to adaptively re- configure these equalizers supports site to site measurement uniformity and significant time savings.

 

Transform Complexity into Simplicity

 

The D9050CEIC conformance software is an easy-to-use TX test application that:

 

• Saves time in understanding details of unique standards measurements

• Offers site to site consistency in uniform measurement results

• Reduces the time it takes to characterize your 56Gbd PAM4 design from hours to minutes

• Helps debug your device using custom test and diagnostic configurations

 

Select Industry-leading Hardware

 

The D9050CEIC conformance software application is specifically designed to leverage the hardware- based equalization and filter acceleration of the Infiniium UXR-Series of real-time oscilloscopes. The Infiniium UXR-Series is highly accurate on timing/jitter related measurements and supports an exceptionally precise PLL implementations achieved with advance signal processing.

Certain CEI-112G measurements require an input referred noise floor of 1.28mV RMS which depending on the measurement signal level, can be exceeded on the Infinium UXR-Series Real-Time Oscilloscopes due to the noise sensitivity of these operations, users should be aware of the relative benefits of a N1000A DCA-X sampling oscilloscope compared to the Infiniium UXR-Series oscilloscope in interpreting the results and accuracy of these automated VSR/MR/LR measurements.

There are a broad set of date rates supported by CEI-112G specifications ranging from 36GBd to 58GBd and the measurements found in VSR, MR and LR sub-standards require a 4’th order Bessel- Thomson low-pass response (termed ‘4BTR’) at 43GHz, tracked out to -9dB (65 GHz). This 4BTR tracking generally requires a Infinium UXR-Series with 70GHz of bandwidth to accommodate. Lower bandwidth Infiniium UXR-Series oscilloscopes can be used with a higher measurement error consideration. Higher bandwidth Infiniium UXR-Series oscilloscopes will be bandwidth constrained by digital filtering to this spec mandated 43GHz 4BTR.

 

Recommended oscilloscope

 

The CEI-112G VSR/MR/LR physical layer conformance test automation measurements require an 4BTR acquisition channel response that is constrained to 65GHz (-9dB on the 4BTR). Use of an instrument with bandwidth below 60GHz for conformance measurements is not recommended.