Intel
®
Ethernet Network Adapter E810-CQDA2T
User Guide
46 722960-002
5.3 PTP Grand Leader (GM) with External GNSS Clock
5.3.1 External Connections
5.3.2 Software Configuration
Before proceeding, configure the GNSS to output a 1PPS signal and connect it to SMA1 (or to U.FL2). It
is recommended to set all SDP pins and U.FL to off (see Section 4.0).
1. Set interface device:
# export ETH=`grep 000f /sys/class/net/*/device/subsystem_device | awk -F"/"
'{print $5}' | head -n 1` #(port0)
# export ETH1=`grep 000f /sys/class/net/*/device/subsystem_device | awk -F"/"
'{print $5}' | head -n 2 | tail -n +2` #(port1)
# export ETH2=`grep 000f /sys/class/net/*/device/subsystem_device | awk -F"/"
'{print $5}' | head -n 3 | tail -n +3` #(port2)
# export ETH3=`grep 000f /sys/class/net/*/device/subsystem_device | awk -F"/"
'{print $5}' | head -n 4 | tail -n +4` #(port3)
2. SMA1 as input and SMA2 as output:
# echo 1 1 > /sys/class/net/$ETH/device/ptp/ptp*/pins/SMA1
# echo 2 2 > /sys/class/net/$ETH/device/ptp/ptp*/pins/SMA2
Or, U.FL2 as input and U.FL1 as output:
# echo 1 2 > /sys/class/net/$ETH/device/ptp/ptp*/pins/U.FL2
# echo 2 1 > /sys/class/net/$ETH/device/ptp/ptp*/pins/U.FL1
Note: If you have SMA1 connected to an external 1PPS source, you cannot use the U.FL
configuration.
3. Verify that the outputs were set correctly:
#dmesg
[793494.341435] ice 0000:84:00.0: SMA1 RX
[793494.341437] ice 0000:84:00.0: SMA2 TX
[793506.667670] ice 0000:84:00.0: <DPLL0> state changed to: unlocked, pin SMA1
[793506.668178] ice 0000:84:00.0: <DPLL1> state changed to: unlocked, pin SMA1
[793518.699755] ice 0000:84:00.0: <DPLL0> state changed to: locked, pin SMA1
[793518.700264] ice 0000:84:00.0: <DPLL1> state changed to: locked, pin SMA1
Figure 8. External Connections: PTP Grand Leader with External GNSS Clock
Red = 1PPS input options
Blue = ptp4l
Green = 1PPS output
Port0
Port1
SMA1
SMA2
U.FL1
U.FL2
Leader
E810-CQDA2T
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