In this demonstration at DesignCon 2019, J.R. Bonnefoy (a Systems Engineer at Samtec) explains how Samtec Flyover® offers a 112 Gbps high-density escape from the system ASIC to the front panel.
A Credo Pelican II SERDES generates 31-bit PRBS data at 112 Gbps PAM4 data rates. Signals travel from the Credo test board, through precision RF cable assemblies, to a Samtec NovaRay cable assembly SI evaluation board.
The Eye Speed cable from the NovaRay connector terminates to a double density Samtec Flyover QSFP28 cable connector, the FQSFP-DD series and cage. Signals then route through Samtec’s QSFP-DD SI Characterization board, through another set of precision RF cable assemblies, and back to the Credo Pelican II SERDES chip.
The results are impressive. The insertion loss plot shows 15 dB of loss at 28 GHz. The Tx and Rx eye diagrams show PAM4 modulation; eye heights are all greater the 125 mV.
The bit error ratio of the entire system is 7.05e-09 pre-FEC, which is 4 – 5 orders of magnitude better than the spec.
Samtec Flyover System
This demonstration illustrates the advantages of the Samtec Flyover system. As bandwidth requirements increase, designers struggle with the challenge of propagating these ever-increasing signal rates through PCBs.
PCB cost is a concern because of expensive low dK PCB materials and more layers. Samtec Flyover solutions allow designers to extend signal reach and density to achieve next gen speeds by routing signals via ultra-low skew twinax cable instead of through lossy PCBs.
Samtec Flyover and NovaRay solve challenges of new generation ethernet equipment – mechanical, heat, signal integrity.
Here’s a link to a Connector Supplier article if you want to learn a little more about Samtec Flyover.
For technical questions contact us at SIG@samtec.com