At the TAP mode of LE-580FX Window, when one port of LE-580FX is connected to a device of auto-negotiation and the other port to a device of non-auto-negotiation, it may cause some trouble in measurement. Please download and use the firmware Ver. 1.7 or later and LE-580FX Window Ver. 1.4 or later.

If you are using the third party software, such as Wireshark, please download and use LE-580FX TAP Mode Utility.