This usually means your driver is reverting to the older 802.11g standard.
Getting only a fraction of your ISP's promised speed. 802.11 n wlan driver
If you meant a shorter instead, here's that: This usually means your driver is reverting to the older 802
For USB 802.11n dongles, the physical port might be the issue. here's that: For USB 802.11n dongles
Imagine an old single-lane road. Now, imagine a four-lane superhighway. That was MIMO. It allowed devices to send and receive multiple data streams simultaneously. Suddenly, theoretical speeds jumped from 54 Mbps to a staggering 600 Mbps. Range improved. Stability improved.
The 802.11n standard, also known as Wi-Fi 4, was a major breakthrough in wireless technology. It introduced Multiple-Input Multiple-Output (MIMO) technology, which uses multiple antennas to transmit and receive data simultaneously.