Information

• FDX: indicates that the network connection is full duplex
• 100M: indicates the presence of a 100 Mb/s network connection (as opposed to 10 Mb/s)
• ACT: flashes when RX or TX activity is present
Physical Characteristics
The maximum length and width of the Uno PCB are 2.7 and 2.1 inches respectively, with the USB
connector and power jack extending beyond the former dimension. Four screw holes allow the
board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160
mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.