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3-6 CHAPTER 3: MAKING CONNECTIONS
The Hub 1000 SX itself can be used as the network backbone by
connecting the uplink to a server equipped with a 3C985-SX Gigabit
EtherLink Server NIC or to a 10/100 Mbps switch equipped with a
3C16925 uplink device (see Figure 3-6). For these backbone connections,
reconfigure the uplink for asymmetric flow control, as described in
“Configuring Port Settings” in Appendix A.
Figure 3-6 Uplink Connection to a 10/100 Mbps Switch
Troubleshooting Table 3-2 summarizes some common problems and their solutions.
100BASE-TX
®
SUPER
STACK
SuperStack II
3000 FX
10/100 Mbps switch
with 3C16925 uplink device
SuperStack II
Hub 1000 SX
Single-mode fiber-optic cable
Maximum distance: 3 km
®
SUPER
STACK
SuperStack II
1000 SX
Table 3-2 Troubleshooting Tips
Symptom Explanation Solution
LINK LED does not light on
a port.
There is no link connection. You may be attempting to connect to equipment
that does not comply with Gigabit Ethernet
standards or does not support auto-negotiation.
Or, the link may be physically damaged (for example,
the cable may be damaged).
Disable auto-negotiation on the port (see Appendix A).
Configure the other end of the link for forced
configuration (see the configuration guidelines for
the device on the other end of the link). A restored
connection rules out physical damage.
ACTIVITY LED does not light
on a port.
The port is not receiving data. Make sure that the link is connected at both ends.
OVERTEMP LED is lit. The unit has overheated.
The fan may have failed.
Return the unit to the supplier.
Amber UNIT STATUS LED stays
lit longer than 30 seconds.
POST software may
be corrupted.
Use the command line interface (CLI) to confirm the
POST error. (See Appendix A.) If POST reports errors,
return the unit to the supplier.
PAUSE LED remains lit. A flickering PAUSE LED
indicates normal flow control.
A PAUSE LED that remains lit
indicates that there is too
much traffic.
Check for problems with the device attached to the
Hub 1000 SX uplink.
POST FAIL messages appear
in the CLI.
There is a fatal
hardware error.
Return the unit to the supplier.