Anritsu extends PAM4 error detector functions

1 min read

Anritsu has released an FEC symbol capture function and Bathtub test capability for its 116-Gbit/s PAM4 Error Detector (ED) MU196040B, offering more functionality for developers of 400-GbE and 800-GbE devices.

To support larger and faster transmissions, data centres, which are a key infrastructure in 5G mobile networks, are also investigating speed upgrades from the current 100 GbE to 400 GbE and in future to 800 GbE/1.6 TbE standards.

PAM4 used in 400 GbE can be easily affected by noise and transmission path losses, making it difficult to achieve the previous level of error-free transmissions and requiring use of FEC (Forward Error Correction) to correct generated errors and maintain transmission quality.

Consequently, there is increasing need for quantitative measurement of jitter-related signal quality, such as jitter tolerance measurement for evaluating the performance of high-speed devices and transceivers for 400-GbE.

To meet this need and support 400G network evolution, Anritsu has now added two new features to its MP1900A - the FEC symbol capture function to evaluate FEC-based network elements, and the PAM4 Bathtub test capability.

In high-speed networks, some low-probability errors are expected in data traffic, errors that are corrected using FEC. The MP1900A ED function determines if the errors can be corrected by FEC and starts capturing data streams only when the burst errors exceed the FEC un-correctable threshold. From the captured data, a user can discover what kind of data steam caused the un-correctable burst errors.

Since the impact of jitter becomes severe as the data-stream baud rate is increased to achieve a higher traffic capacity, Anritsu has added the PAM4 Bathtub test capability to evaluate and quantify the jitter phase margin.

The modular MP1900A running embedded Windows 10 can easily be expanded. As well as supporting 400-GbE and 800-GbE PAM4, it is a market-leading bit error rate tester (BERT) for various high-speed interfaces, including PCI Express Gen5 and USB4, using a full line of modules and application software.