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---Essentials of Spirent TestCenter 400 Gbps Testing including L1 Service---

Summary

Testing Seven-Speed 400/200/100/50/40/25/10GbE using a Spirent TestCenter dX3 or pX3 QSFP-DD Test Module or Appliance

The first part of this Article addresses initially establishing link, the second part addresses Performance Testing up to 400 Gbps, and lastly the video addresses using the Spirent TestCenter Application's L1 Service, enjoy!

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Series: Spirent TestCenter Continuing Education
 

Content

This Article is in reference to the following Test Modules and Appliances:
 
Datasheet: Spirent dX3 2-Port Seven-Speed 400/200/100/50/40/25/10GbE QSFP-DD Test Module
Datasheet: Spirent dX3 8-Port Seven-Speed 400/200/100/50/40/25/10GbE QSFP-DD Appliance
Datasheet: Spirent pX3 2-Port Seven-Speed 400/200/100/50/40/25/10GbE QSFP-DD Test Module
Datasheet: Spirent pX3 8-Port Seven-Speed 400/200/100/50/40/25/10GbE QSFP-DD Appliance
 
Spirent now supports CMIS Rev 4.0, however, the main issue you’ll have if any is initially establishing link. Besides no cable being plugged in, the transceiver not being properly inserted, or using an unintended transceiver, this is usually the result of an “emphasis” issue (i.e., Pre-emphasis Tap, Main Tap, and Post-emphasis Tap). So if link comes up initially, then you can skip this first half. But should link fail, try these tips relative to the Port’s Advanced tab:
 
 
 
1) Well first of all wait a few minutes longer, take a break and come back.
2) Auto detect works with Auto Negotiate on the General tab and is the default setting, so that you have already tried.
3) Manual, which disables Auto Negotiate, can be used if Auto detect fails and presents the user with the following preset values: Optical, 0-1 Meter Copper, 2 Meter Copper, and Loopback. Don’t forget to “Apply” after making changes!
4) Advanced also works with Auto Negotiate on the General tab and allows the user to enter the TX deemphasis pre tap, TX deemphasis post tap, and TX main tap swing. Select “Advanced” then select the General tab’s “Link Training Resolved Settings” and select “Apply LT Settings to Port”. But feel free to change these settings yourself if it still doesn’t link. Don’t forget to “Apply” after making changes!
5) See attached below from Spirent engineering which speaks of a “Bathtub” method to find emphasis values.
6) Still not working, please reach out to Spirent Support.
 
Once you have link, Performance Testing up to 400 Gbps is still conducted as it has always been, just now at faster speeds; and similarly for Emulation. Keep in mind though that scale and supported counters are based on DX3 and PX3 class PGA architecture; see the Datasheet sheet links above. But most users won’t notice any difference from other modules.
 
Attached and below you see the Maximum Frame Rates for Ethernet table filled in for all higher rates too. Frame sizes listed are those for RFC2544's 7 recommended Ethernet Sizes. The table attached below also allows you to replace "Any#" in column J with a custom # for ‘odd’ frames sizes (i.e., those not specified by RFC 2544).
 

Media Type Mbps 64 Bytes 128 Bytes 256 Bytes 512 Bytes 1024 Bytes 1280 Bytes 1518 Bytes
10 Mb Ethernet 10 14,881 8,446 4,529 2,350 1,197 962 813
100 Mb Ethernet 100 148,810 84,459 45,290 23,496 11,973 9,615 8,127
1 Gigabit Ethernet 1,000 1,488,095 844,595 452,899 234,962 119,732 96,154 81,274
2.5 Gigabit Ethernet 2,500 3,720,238 2,111,486 1,132,246 587,406 299,330 240,385 203,186
5 Gigabit Ethernet 5,000 7,440,476 4,222,973 2,264,493 1,174,812 598,659 480,769 406,372
10 Gigabit Ethernet 10,000 14,880,952 8,445,946 4,528,986 2,349,624 1,197,318 961,538 812,744
25 Gigabit Ethernet 25,000 37,202,381 21,114,865 11,322,464 5,874,060 2,993,295 2,403,846 2,031,860
40 Gigabit Ethernet 40,000 59,523,810 33,783,784 18,115,942 9,398,496 4,789,272 3,846,154 3,250,975
50 Gigabit Ethernet 50,000 74,404,762 42,229,730 22,644,928 11,748,120 5,986,590 4,807,692 4,063,719
100 Gigabit Ethernet 100,000 148,809,524 84,459,459 45,289,855 23,496,241 11,973,180 9,615,385 8,127,438
200 Gigabit Ethernet 200,000 297,619,048 168,918,918 90,579,710 46,992,481 23,946,360 19,230,769 16,254,876
400 Gigabit Ethernet 400,000 595,238,095 337,837,837 181,159,420 93,984,962 47,892,720 38,461,538 32,509,753

 

For a demonstration of using the Spirent TestCenter Application's L1 Service, select the Video Play Button below:

Attachments
Attachment Description
Bathtub Method To Find Emphasis Values

Attachment Description
Maximum Frame Rates for Ethernet Table

Product : Spirent TestCenter,Hardware Module,High Speed Ethernet