5 Other Features
5 Other Features
5.1 PoE Passthrough
Both ethernet ports are capable of handling Power over Ethernet (PoE) as specified in IEEE
802.3af, 802.3at and 802.3bt. Power is passed through in both directions without interception.
5.2 PTP Timestamps
The device provides high resolution timestamps for packets. This can help to debug PTP related issues,
or any other timing issues. These timestamps are in nanoseconds with 10 ns resolution.
Each PHY has its own FIFO, which may affect accuracy. In addition, device-internal CDC may affect the
accuracy. Internally, the timestamps are generated by a 100 MHz clock and are passed to the ethernet
PHY’s (RGMII) clock domain, which introduces jitter. The timestamps are relative to device start.
The host tool capture output adds a start offset to the timestamps to make them roughly line up with wall
clock times. However, this offset is not precise, and there is no time correction. The absolute time of a
packet event might be slightly different from real time. The longer the capture is running, the higher the
deviation will be.
IN3083WP has additional information.
5.3 Supported Command Line Options
You can list supported options as follows:
nose --help
Current list of options:
Name
Description
--verbosity 0|1|2
Set verbosity log level: 0 silent, 1 normal/default, 2 verbose
messages
--version
Print host software version and exit
--selftest
Run internal self-test. (Requires a loop between the two ports.)
--selftest-serial
Internal.
--wireshark
Start wireshark and dump packets to it. Terminate once done.
--device name
Open this device. (Pass ”help” to get a list. ”none” prevents
automatic opening of a device.)
--firmware-update file
Perform a firmware update using this file.
--firmware-update-all
Update firmware of all devices that have been found. (Since v1.2.)
--firmware-update-force
Update firmware even for devices which have the current or newer
firmware version. (Since v1.2.)
--fifo file
Start capture and write to the given file or fifo. (Overwrites the
target if it’s a file.)
--ipc-connect path
Connect IPC to this socket/named pipe. Terminate on disconnect.
--ipc-server name
Host IPC on this socket/named pipe.
--capture-soft-buffer num
Capture soft buffer (in bytes, accepts kib/mib/gib suffix)
--capture-usb-buffer num
Capture libusb buffer (in bytes, accepts kib/mib/gib suffix)
--capture-stats
Show capture statistics every 1 seconds.
--extcap-*
Various options for use by the Wireshark extcap mechanism.
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