3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual - page 17
Switch — Front View Detail
17
LEDs
Table 4
lists LEDs visible on the front of the Switch, and how to read their
status according to color. For information on using the LEDs for problem
solving, see
“Checking for Correct Operation of LEDs”
on
page 27
.
Table 4 LED behavior
LED
Color
Indicates
Port LEDs
Packet
Yellow
Packets are being transmitted/received on the port.
Off
No packets are being transmitted/received on the port.
Status
Green
A high speed (1000 Mbps) link is present, and the port
is enabled.
Green flashing
A high speed (1000 Mbps) link is present, but the port
is disabled.
Yellow
A low speed (100 Mbps on 4900, 10/100 Mbps on
4924/4950) link is present, and the port is enabled.
(Not applicable on 4900 SX.)
Yellow flashing
A low speed (100 Mbps on 4900, 10/100 Mbps on
4924/4950) link is present, but the port is disabled.
(Not applicable on 4900 SX.)
Off
No link is present.
Module LEDs
Packet
Yellow
Packets are being transmitted/received on the port.
Off
No packets are being transmitted/received on the port.
Status
Green
The Module is installed and supported. The Link Status
has been determined for a single port Module.
Yellow
The Module is installed and supported. The Module
has multi-ports or there is no link for a single port
Module.
Yellow flashing
The Module is installed but not supported. Note that
the Switch will continue to operate normally.
Yellow flashing
(fast)
A port on the Module has failed POST and has been
automatically disabled.
Off
The Module is not installed.
Unit LEDs
1–4
Green
Determines the identity of the Switch when
interconnected to another Switch to create an XRN
Distributed Fabric and that a link is present.
Off
A fault has occurred.
Power/Self Test LED
Green
The Switch is powered-up and operating normally.