Technical data

Troubleshooting
893-00992-D
4-5
Port Connection Problems
Port connection problems can usually be traced to a poor cable connection or an
improper connection of the port cables at either end of the link. These types of
problems can be remedied by making sure that the cable connections are secure
and that the cables are connected to the correct ports at both ends of the link.
Port connection problems can also be traced to the autonegotiation mode or the
port interface.
Autonegotiation Modes
Port connection problems can occur when a port (or station) is connected to
another port (or station) that is not operating in a compatible mode (for example,
connecting a full-duplex port on one station to a half-duplex port on another
station).
The BayStack 350 switch negotiates port speeds according to the IEEE 802.3u
autonegotiating standard. The switch adjusts (autonegotiates) its port speed and
duplex mode to match the best service provided by the connected station, up to
100 Mb/s in full-duplex mode.
• If the connected station uses a form of autonegotiation that is not compatible
with the IEEE 802.3u autonegotiating standard, the BayStack 350 switch
cannot negotiate a compatible mode for correct operation.
• If the autonegotiation feature is not present or is not enabled at the connected
station, the BayStack 350 switch may not be able to determine the correct
duplex mode.
The Diagnostics LED is
off.
A fatal error was detected by
the self-test.
Cycle the power to the switch (disconnect and
then reconnect the AC power cord).
If the problem persists, replace the switch.
The Diagnostics LED is
blinking.
A nonfatal error occurred
during the self-test.
Cycle the power to the switch (disconnect and
then reconnect the AC power cord).
If the problem persists, contact the Bay Networks
Technical Solutions Center.
Table 4-2. Corrective actions (continued)
Symptom Probable cause Corrective action