LEDS 
¾
1)  LEDs lie at the left side of the panel (1000Mbps Link/Act LED of the SFP 
lie at right side of the SFP).
2)  Power LED: solid red when power is supplied to the switch and is 
operating normally.
3)  System LED: solid green when CPU of the switch works normally.
4)  10/100Mbps LED: When a 10/100Mbps port connect to a 100Mbps 
device, the corresponding LED turns on in solid green; When the port 
connects to a 10Mbps device, the LED turns off.
5)  10/100/1000Mbps LED: When a 10/100/1000Mbps port connect to a 
1000Mbps device, the corresponding LED turns on in solid green; When 
the port connect to a 10/100Mbps device, the LED turns off.
6)  Link/Act LED: Solid green when a valid link is established on the port; 
Flashes green when packet transmission or reception is occurring on the 
port. (SFP port has Link/Act LED only and must connect to 1000Mbps 
device.)
The following shows the front panel of TL-SG2109WEB, TL-SL2218WEB, TL-
SL2428WEB and TL-SL2452WEB: