Ethernet
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Contents
1 Introduction
2 Fast command
Ethernet use 8b10b (like usb) using several patterns for the same value allowing differential coding. Meta patterns called ``K characters'' are use to indicate start and end of frame. The called ``DAQ v2'' use its own ``k character'' to embed fast command (a single 10b byte) in the trames (LDA<->DIF links only).
Note that this coding (no returns to 0) allow to embed a clock, but this is not used in Calice project (which use a CCC card).
Display input and output rate every 4 seconds:
$ ifstate -nb -i eth6 4
3 Gigabit
LDA are delivered with Optical Mezzanines without SGMI for rate négatiation. In order to change it for an Electrical Mezzanine, we must ensure that is is ``SFP/1250'' compliant, but not ``SFP/10-100-1250'' for instance.
# ethtool eth6 Port: FIBRE Link detected: yes
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