3Com 3CR17450-91, Getting Started Manual

Page: 15 / 86

Physical Features 13
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 Indicates
Port Status/Packet LEDs
Green A high speed (1000 Mbps) link is present, and the port
is enabled.
Green flashing A high speed (1000 Mbps) link is present and active.
Yellow A low speed (10/100 Mbps) link is present, and the
port is enabled.
Yellow flashing A low speed (10/100 Mbps) link is present and active.
Green for one
second, amber
for one second,
then off until
operational. POST in operation, all LEDs perform a one second lamp
test.
Alternate yellow
then green
flashing (fast) A port has failed a loop back test during POST.
Alternate yellow
then green
flashing A link is present but the port has been disabled.
Off No link is present.
Stacking Status LED
Green The uplink/downlink is operating normally.
Yellow 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.
Off No stacking link is present.
Stack Master LED
Green Master unit - normal stack operation status.
Yellow Slave unit - normal stack operation status.
Yellow flashing The system is in arbitration/election status.
Off The system is not stacked.