
Award Winning Solutions
Xena has won multiple global awards for price/performance and technical innovation. Learn more.

Technical Expertise
Copyright © 2009-2026 Teledyne LeCroy Xena ApS, Denmark
This technical note explains in detail how Z800 Freya tests the link training process to help you optimize the performance of 112G SerDes devices.
It covers: presets, coefficient values and step sizes, link training, Xena’s LT algorithm, how to test the performance of a DUT’s LT, algorithm, FIR filter, the relation between emphasis and tap coefficients, & coefficient settings in Z800 Freya.
| Z800q Freya (shown above) | Z800o Freya | |
| Interfaces Port x Speed | QSFP-DD800 112G SerDes (PAM4) 1 x 800GE 2** x 400GE 4** x 200GE 8** x 100GE 56G Serdes (PAM4) 25G/10G Serdes (NRZ) ** QSFP-DD module offers the option to provide connectivity in both 2 cages. If any of those modes are selected, the same interface configuration will be on all ports, and the ports will be shared across the 2 cages. For instance if the QSFP112 mode with 8 x 100G is chosen, 4 ports will be available in QSFP-DD cage and 4 ports will be available in the QSFP112 cage. | OSFP 112G SerDes (PAM4) 1 x 800GE 2 x 400GE 4 x 200GE 8 x 100GE 56G Serdes (PAM4) 25G/10G Serdes (NRZ) |
| XenaCompact | ✓ | ✓ |
| XenaBay | ✓ (can only be installed in the B2400 chassis) | ✓ (can only be installed in the B2400 chassis) |
… for this technology



