3com 3C16951 User Manual
14
C
HAPTER
1: I
NTRODUCING
THE
S
WITCH
1100
LEDs
lists the LEDs visible on the front of the Switch, and their states
according to color. For information on using the LEDs for problem solving,
see
see
Table 3 LED behavior
LED
Color
Indicates
TCVR
Yellow
Port 1 is a Transceiver Module fitted to the rear of the
Switch.
Switch.
Off
Port 1 is operating as a 10BASE-T port.
Port Status LEDs
Packet
Yellow
Packets are being transmitted/received on the port.
Off
No packets are being transmitted/received on the port.
Status
Green
A link is present, and the port is enabled.
Green flashing
A link is present, but the port is disabled.
Off
No link is present.
Expansion Module Port Status LEDs
Packet
Yellow
Packets are being transmitted/received on the
Expansion Module port(s).
Expansion Module port(s).
Off
No packets are being transmitted/received on the
Expansion Module port(s).
Expansion Module port(s).
Status
Yellow
A valid Expansion Module is installed.
Yellow flashing
An unrecognized Expansion Module is installed.
Off
No Expansion Module is installed.
Unit LEDs
1–8
Green
The Switch forms a stack with other Switch units; the
LED indicates the position of the Switch in the stack
and that a link is present. Note that although there are
eight LEDs, only four Switch units can be stacked at
present.
LED indicates the position of the Switch in the stack
and that a link is present. Note that although there are
eight LEDs, only four Switch units can be stacked at
present.
Off
The Switch is stand-alone.
Power/Self Test LED
Green
The Switch is powered-up.
Green flashing
The Switch is either downloading software or is
initializing (which includes running a Power On Self
Test).
initializing (which includes running a Power On Self
Test).
Yellow
The Switch has failed its Power On Self Test.
Off
The Switch is not receiving power.
16950ua.bk Page 14 Thursday, April 29, 1999 1:28 PM