Ethernet from the Start – and for Many Years to Come
Ethernet has developed over the last decades and is today the dominant technology in data communication networks. Starting at 10Mbps, data rates has increased with the ever-growing demand for bandwidth.
For many years the NRZ modulation has been used for Ethernet signals sent over data lines. 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.
NRZ is used in legacy Ethernet systems for speeds up to 100Gbps. However, speeds higher than 25Gbps are sent as a number of parallel signals each running either approx. 25Gbps or 10Gbps – the SerDes speed.
Other Ethernet standards have been developed that support higher rates than 100Gbps using another modulation technique (PAM4). However, there is still a vast number of NRZ-based Ethernet systems being deployed world-wide.
The Odin, Loki and Thor test modules in Xena’s Valkyrie platform support testing of NRZ-based Ethernet at data rates from 10Mbps to 100Gbps:
- Odin: NRZ at 10 Mbps / 100Mbps / 1G / 2.5G / 5G / 10G
- Loki: NRZ at 10G / 25G / 40G / 50G
- Thor: NRZ at 10G to 100G & PAM4 56Gpbs Serdes at 50G to 400G
Xena’s Vulcan, Chimera and Vantage products also support testing of NRZ-based Ethernet.