Front Panel Button
S3900-24T4S
S3900-24T4S
Button
RESET
Back Panels
S3900-24T4S/S3900-48T4S
S3900-24F4S
1
2
3
4
5
6
7
8
9
10
11
12
13
Description
Restart: Press and release the Reset button quickly.
Restore to Factory Default Settings: Press and hold the Reset
button for more than ten seconds.
Dual Power Supplies
Dual Power Supplies
Dual Fans
14
15
16
17
18
19
20
21
22
23
24
25
MGT
26
27
28
26
28
SYS
PWR
RESET
25
27
CONSOLE
RESET
Grounding Point
Grounding Point
3