BERT takes on 400 Gbps links
This product is featured in EDN's Hot 100 products of 2016. See all 100 here.
Seeing that need, Keysight Technologies has introduced the M8040 BERT (bit-error rate tester). Consisting of AXIe pattern generator and error detector modules, the M8040A can, at the present time, produce and detect 32 Gbps NRZ and 32 Gbaud (64 Gbps) PAM4 signals. Future versions will double the data rates. The current 32 Gbaud (64 Gbps) PAM4 capability give the M8040A the ability to test 28 Gbaud (56 Gbps) PAM4 links now.
The pattern generator—a 3-slot M8045A—lets you add jitter and de-emphasis to transmitted signals when you add the M8057A remote head (shown in photo, click to enlarge). That lets you measure BER under less than ideal conditions.
The remote head lets you shorten connections between the DUT and the measurement instrument, which minimizes signal losses and crosstalk in the measurement loop. "Channel loss is significant above 16 GHz," said Keysight's BERT Product Manager Ellen Spindler.
NRZ and PAM4 modulation are software selectable and the pattern generator lets you adjust PAM4 nonlinearity, which means you can adjust the shape of the signals and test over a range of eye patterns. By changing eye height in PAM4 or NRZ signals, you can test a receiver for bit detection at varying voltage levels (eye height) and you can test for clock recovery.
|32 Gbps NRZ||32 Gbaud PAM4||64 Gbps NRZ||64 Gbaud PAM4|
|Pattern generator module M8045A (3-slot), 1 ch with jitter and de-emphasis, remote head M8057A||$189,000||$257,000||$300,000||$388,000|
|Error detector module M8046A (1-slot), 1 ch||$58,000||$125,000||Not available||Not available|
|AXIe 5-slot chassis, M8070A software and embedded controller||$32,000||$32,000||$32,000||$32,000|
Keysight Technologies, M8040A product page.