3Com OFFICECONNECT ETHERNET HUB 8, Руководство пользователя, Страница: 100 / 130

6-2 C
H A P T E R
6: P
R O B L E M
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O L V I N G
Problems When Using Your Hub
Power LED not lit. Check your power adapter
connection. If there is still no power, you may have a
faulty power adapter which needs replacing with
another OfficeConnect power adapter. Do not use
any other power adapter with the hub.
Alert LED continuously lit. If you haven’t configured
the Alert LED, it lights for two default conditions. It
could be that there is either continual excessive use
of your network (over 80%) or, more likely, a
10BASE-T port has partitioned due to a loop in your
network (in which case a Port Status LED is yellow).
Examine your connections and remove the loop.
Each piece of equipment needs only one connection
to your Office Connect h ub.
If you have configured the Alert LED, check the Alerts
dialog box in Quick Config Manager to see what
conditions have caused the LED to light, see “Setting
Up the Alert LED” on page 4-15 .
Check that the Alert LED Test is disabled, in the Alerts
dialog box. If it is not, select Disable and click on OK.
Port Status LED yellow for a 10BASE-T port.
It is likely that there is a loop in your network which
has caused this port to partition. Examine your
connections and remove the loop. Each piece of
equipment needs only one connection to your
Office Connect h ub.
Port Status LED not lit for a 10BASE-T port that
has a connection. There is a problem with this
connection. Check you are using a ‘Straight-through’
10BASE-T cable which is properly connected at both
ends, is not damaged, and that the equipment it is
connected to is powered on and operating correctly.
Link between two OfficeConnect hubs not
working. C heck your hub connections; follow the
information given in “Connecting OfficeConnect
Hubs Together” on page 2-8 . With 10BASE-T it is
likely an MDI/MDIX switch is set incorrectly. With
10BASE-2 (Coax) it is likely a terminator ( end piece )
is not fitted properly; this would cause the Coax Port
Status LED to light yellow (partition).
16710.bk : PROBSOLV.FRM Page 2 Tuesday, October 7, 1997 11:38 AM