TP-Link TL-WN781ND - 1.3 Hardware Overview

TL-WN781ND 150Mbps Wireless N PCI Express Adapter User Guide
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1.3 Hardware Overview
LED status:
Status Working Status
Off
The driver has not been installed;
The adapter's radio has been disabled.
Flashing Slowly
The driver has been installed but no data is being transmitted or
received.
Flashing Quickly Data is being transmitted or received.