LinkTraining
Link training can facilitate debugging the high speed serial link training protocol found in 100G Datacom applications. Standards
include Ethernet and InfinBand using NRZ electrical signaling at 25 Gbps, such as 100GBASE-CR4, CEI LR, 100GBASE-LR4
and CAUI4.
Link Training environment
Oscilloscope channels are used to monitor both directions of a serial lane and present Tx and Link Partner request/response
information for each direction. Analog waveform signaling activity is captured along with Control Channel protocol information to
provide a complete view of the link training process.
Each left/right side of the lane transmits, Coefficient Update Requests for the far transmitter changes, and Status Report
Responses to confirm near transmitter changes.
The oscilloscope eavesdrops on both full-duplex conversations.
Link training activity is passively observed using 20/80 power dividers and differential probing for each lane. The following figure
illustrates typical connection using breakout fixtures, power dividers and P7633 active probes.
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 211
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