3Com SuperStack 3 3870 Getting Started Manual page 15

The console port on the Switch is set to autobaud (up to a maximum of
19,200 baud), 8 data bits, no parity, and 1 stop bit.
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 24.
Table 4 LED Behavior
LED Color
Port Status/Packet LEDs
Green
Green flashing
Yellow
Yellow flashing
Green for one
second, amber
for one second,
then off until
operational.
Alternate yellow
then green
flashing (fast)
Alternate yellow
then green
flashing
Off
Stacking Status LED
Green
Yellow
Off
Stack Master LED
Green
Yellow
Yellow flashing
Off
Indicates
A high speed (1000 Mbps) link is present, and the port
is enabled.
A high speed (1000 Mbps) link is present and active.
A low speed (10/100 Mbps) link is present, and the
port is enabled.
A low speed (10/100 Mbps) link is present and active.
POST in operation, all LEDs perform a one second lamp
test.
A port has failed a loop back test during POST.
A link is present but the port has been disabled.
No link is present.
The uplink/downlink is operating normally.
One-sided connection (one side of the cable is
connected but the other side is not). The Switch may
be at the end of line stack, with no wrap-around cable.
No stacking link is present.
Master unit - normal stack operation status.
Slave unit - normal stack operation status.
The system is in arbitration/election status.
The system is not stacked.
Physical Features 13