ADLINK Technology ROScube-Pico NPN Series, User Manual, Page: 21 / 37

Pinouts and Signal Descriptions
15
Notes:
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LAN 1 MAC address is defined by NVIDIA module. LAN 2, LAN 3, and LAN 4 have MAC addresses provided by
ADLINK.
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During boot up, the activity LED on LAN1 will light up for a few seconds, even if the port is not connected. This is
normal behavior and does not affect the function of this product.
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The number of the LAN ports on the front I/O panel does not correspond to the number of the Ethernet connection
displayed by the operating system. The operating system will number the connections in the order they are made,
regardless of the port numbers on the panel.
3.2.1 Uplink and Downlink Limitations
LAN 2, LAN 3, LAN 4, and 4 USB 3.0 ports all share the same USB hub that connects to the NVIDIA Jetson
Nano/Xavier module. The total available downlink bandwidth is 5 Gbps, which is shared among LAN 2, LAN 3, LAN
4, and 4 USB 3.0 ports. The total available uplink bandwidth is 5 Gbps, which is also shared among these 7 ports.
The maximum uplink and downlink capacity for one LAN port is 1,000 Mbps, and for one USB 3.0 port is 5 Gbps.
When LAN 2, LAN 3, LAN 4, and 4 USB 3.0 ports are all uploading or downloading data at the same time, each
port will try to upload and download data at maximum capacity. This may result in lost packets, connection time-
outs, and missing USB devices. It is suggested that the users avoid using these ports in situations that will lead to
combined uplink and downlink requirements of over 5 Gbps.
USB Hub
Upstream
LAN2 LAN3 LAN4 USB 3.0 USB 3.0 USB 3.0 USB 3.0
Jetson Nano/Xavier
USB 3.1
Gen1
1000
Mbps
USB 3.1
Gen1
USB 3.1
Gen1
USB 3.1
Gen1
USB 3.1
Gen1
1000
Mbps
1000
Mbps
Uplink: 5Gbps maximum
Downlink: 5Gbps maximum
Figure 10: Ethernet and USB Hub Configuration