CEI 28G VSR Software Datasheet

CEI-VSR Compliance and Debug Solution

The new CEI-VSR solution helps customers to easily select measurements for CEI-28G-VSR testing. Simple and easy-to-use measurement setup helps customers perform all measurements with a single button click. Automation options help customers meet their compliance needs and generate detailed reports. User-defined mode lets customers make changes to the test limits and perform margin testing beyond compliance.

• With an industry-leading intrinsic jitter of less than 100 femtoseconds for extremely accurate device characterization, the DSA8300 Series provides comprehensive support for Optical Communications Standards.

Key features

• Option CEI-VSR enables both an automation solution (for compliance) and 80SJNB Option (for debug)
• Option CEI-VSR works on Tektronix DSA8300 Series oscilloscopes; it allows you to automate setup and quickly generate reports
• Meets compliance needs of CEI-28G-VSR Host-To-Module (H2M) and Module-To-Host (M2H)
• Supports PRBS9 pattern for all measurements except 8180 pattern which is required for transition time measurement.
• VEC (Vertical Eye Closure) measurement is provided as an informative test under the H2M section
• Option CEI-VSR determines the optimal value of CTLE peaking, which is required by the CEI 28G Very Short Reach for the H2M interface. The best CTLE filter is chosen from the given set of filters and used for performing the measurement.
• Peaking Value and Loop BW are configurable and help to achieve better measurement accuracy
• Under user defined mode, users can configure BER and rely on off-the-shelf products to perform this complex measurement rather than developing custom lab setup reducing testing time and complexity
• Detailed test reports with margin and statistical information aid analysis
• User-defined mode enables flexible parameter control for characterization and margin analysis
• Complete programmatic interface available; users can call CEI-VSR functions using their automation scripts
• Design engineers can utilize many built-in reporting features, such as Appending the Report, Auto-incrementing the Report, including user comments and more to tailor their reporting requirements.
• CEI-VSR Compliance Solution performs Automatic Signal Validation before performing tests and throws an error if the signal does not meet acceptable limits.

Applications

CEI-VSR transmitter testing for:

• Device silicon validation
• Product developers (Product Design, Validation, Debug and Compliance)
• System compliance and debug
• Manufacturing test

Technology overview

Electrical interconnect (chip-to-chip, chip-to-module, board-to-board in the box), electrical backplane and short (<15 m) Infiniband-grade passive cables must support systems fronted with optical 100 Gb/s signaling in standards such as 100GbE Optical (802.3ba) and OTN. Original system designs accomplished this by using 10x10G electrical signaling which has been developed previously to support 10 Gb/s optical links (802.3ae, for example).

Optical Internetworking Forum - Common Electrical Interface - 28G-VSR (CEI-28G-VSR)

This clause details the requirements for the CEI-28G-VSR very short reach high speed chip-module electrical I/O of nominal baud rates of 19.60 Gsym/s to 28.05 Gsym/s. A compliant device must meet all of the requirements listed below. The electrical I/O is based on high speed, low voltage logic, and connections are point-to-point balanced differential pairs. The electrical IA is based on channel loss and jitter budgets. It defines the characteristics required to communicate between CEI-28G-VSR drivers and CEI-28G-VSR receivers using copper signal traces on a printed circuit board, a mated connector pair and copper signal traces inside an optical module. These characteristics are normative for the devices and informative for the channel. A 'length' is effectively defined in terms of its attenuation and phase response rather than its physical length. CEI-28G-VSR devices from different manufacturers shall be interoperable.

Increasing worldwide demand for video and data transfer is placing new requirements for network expansion. Designers are creating innovative network elements that allow up to 100 Gb/s, which will be delivered using four lanes of 25-28 Gb/s. The Implementation Agreement for Optical Internetworking Forum Common Electrical Interface (OIF CEI) 3.0 specifies the tests and limits for these devices.

The use of pluggable optical transceivers is a common practice in equipment developed for the communications market. Developing interoperable pluggable IO (input/output) solutions that keeps up with the demanding bandwidth needs of industry is critical to enabling next generation equipment that supports the communications service providers. The 28G-VSR channel consists of 100Ω differential PCB traces, vias, one connector and AC coupling capacitors. The 28G-VSR IA is intended to be used for Very Short Reach channels with up to 10 dB loss at Nyquist rate and is being initially targeted for the next generation of optical modules having retimed interfaces operating at 25 - 28 Gb/s.

Simplified instrument setup

Setup and test execution is simple with the CEI-VSR software. The oscilloscope acquisition and analysis are all controlled through the CEI-VSR automation solution. The Graphical User Interface (GUI) provides an intuitive workflow for setup and testing.

TekExpress® CEI-VSR measurement setup

Test configurations

Design characterization is supported beyond CEI-28G-VSR compliance requirements for all measurements. Qualify PHY with flexible control over test configurations such as analysis windows and other parameters. User-defined mode lets customers make changes to the test limits and perform marginal testing beyond compliance.

Margin testing

User-defined mode

Under user-defined mode, users can configure BER and rely on off-the-shelf products to perform this complex measurement rather than developing custom lab setup, reducing testing time and complexity.

User configurable BER

Automatic selection of CTLE filter

Option CEI-VSR determines the optimal value of CTLE peaking, which is required by the CEI 28G Very Short Reach for the Host-to-Module interface. The best CTLE filter is chosen from the given set of filters and used for performing the measurement. Peaking Value and Loop BW are configurable and helps in better measurement accuracy.

CEI-28G-VSR measurements covered in Tektronix CEI-VSR solution

Calibration parameter

Design engineers working on their next generation 28G products are given access to various calibration parameters like Deskew, External Attenuation, etc.. to make sure results are as accurate as possible.

Calibration dialog

Setup diagram

For more information, refer to the Application Note Practices for Measurements on 25 Gb/s Signaling on the Tektronix Web site at www.tektronix.com.

Summary report

A summary report in .MHT (MHTML) format with Pass/Fail status is automatically generated after tests complete. The report includes test configuration details, waveform plots, and margin analysis to provide more insight into your design.

Pass/Fail report