for testing Ethernet traffic of NRZ speeds:

10G / 25G / 40G / 50G / 100G

What is Loki?

In Nordic mythology, Loki is the god of mischief. In the world of Ethernet testing, Loki is an important part of the Valkyrie product line, which is Xena’s Ethernet Traffic Generation & Analysis (TGA) solution.

Loki supports testing of NRZ-based Ethernet at data rates of 10G / 25G / 40G / 50G / 100G.

Valkyrie line also includes Odin (NRZ testing 10Mbps to 10G), Thor (NRZ testing 10 to 100G and PAM4 testing 100G to 400G), and Freya (currently PAM4 testing 100G to 800G and in the future also 1.6 Terabit).

Speeds and technology

Loki uses NRZ technology. NRZ modulation has been used for Ethernet signals sent over data lines for many years. NRZ stands for “non-return to zero” – a modulation technique for serial communications that uses two voltage levels to represent logic 0 and logic 1. Loki supports Ethernet testing of NRZ data rates of 10G / 25G / 40G / 50G / 100G.


Theere is currently only 1 Loki test module (see table below). It is available in Xena’s fixed 1U chassis: the ValkyrieCompact. Or it can be used in the modular 4U ValkyrieBay chassis.


All Valkyrie solutions include user-friendly software to make it quick and easy to perform a multitude of relevant performance, QA, compliancy and functional testing: ValkyrieManager, applications for automated RFC 2544, Y.1564, RFC 2889 and RFC 3918 testing, ValkyrieCLI and ValkyrieTimeSynch.

Odin – Ethernet Testing for NRZ 10Gbps SerDes at 10 Mbps / 100Mbps / 1G / 2.5G / 5G / 10G - Valkyrie hardware: test module, ValkyrieBay chassis and ValkyrieCompact chassis

See also:

Loki: Ethernet Testing NRZ up to 100G

Interfaces2 QSFP28
Ports x Speeds2 x 100GBASE-SR4/LR4/CR4
or 4 x 50GBASE-SR2/LR2/CR2
or 2 x 40GBASE-SR4/LR4/CR4
or 8 x 25GBASE-SR/LR/CR
or 8 x 10GBASE-SR/CR

Try it now:

Fill in the form below and we will send you a link where you can download the latest version of Valkyrie. We’ll include instructions on how to install and connect to Xena’s live demo system which consists of two ValkyrieBay chassis connected to various switches and routers.

  • Shortly after submitting this form, you will receive an email with files and instructions on how you begin your Valkyrie demo.