4
EN
Front Panel LEDs
S3900-24T4S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25
26
26
27
28
27
28
SYS
PWR
RESET
CONSOLE
MGT
SYS
PWR
RJ45
SFP+
LEDs
Description
Status
PWR
SYS
RJ45/SFP/SFP+
Green
Green
Green
Blinking Green
System is working properly.
System is not working properly.
Off
Off
Switch is powered on.
Data is being transmitted or received.
No device is connected to the corresponding port.
A device is connected to the corresponding port,
but no activity.
S3900-24T4S
S3900-24F4S
S3900-48T4S
S3900-24F4S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
21
22
23
24
25
26
27
28
SYS
PWR
CONSOLE
MGT
SFP
SFP+
SYS and PWR
S3900-48T4S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CONSOLE
MGT
SYS
PWR
49
50
51
52
SYS and PWR
RJ45
SFP+
