3Com 3CR858-91 Power LED or Power Adapter OK LED Not Lit

94 CHAPTER 6: TROUBLESHOOTING
the Router software on the accompanying CD-ROM or 3Com web site
(http://www.3com.com) and upload it to the Router to see if this
clears the fault (refer to “Recovering from Corrupted Software”
below). If this does not fix the problem, contact your supplier for
further advice.
■During normal operation, you may notice the Alert LED lighting briefly
from time to time. This indicates that the Router has detected a hacker
attack from the Internet and has prevented it from harming your
network. You need take no specific action on this, unless you decide
that these attacks are happening frequently in which case you may
wish to discuss this with your ISP. The Router logs such attacks, and
this information is available through the Status and Logs screens.
Power LED or
Power Adapter OK
LED Not Lit
■Check that your Router is receiving power by looking at the status of
the Power LED on the front panel and the Power Adapter OK LED on
the rear panel:
■If both LEDs are lit green then the unit is receiving power.
■If both LEDs are unlit then no power is being supplied to the unit.
Check that the power adapter is plugged into a working mains
outlet and that the mains outlet is supplying power. If the mains
socket is supplying power then the power adapter or power
adapter connection may be faulty. See “Replacement Power
Adapters” below.
■If the Power Adapter OK LED is lit but the Power LED is unlit then
there may be a fault with your unit. Contact 3Com Technical
Support.
■Check that you are using the correct power adapter for your Router.
You should only use the power adapter supplied with your Router.
Replacement Power
Adapters
If both the Power Adapter OK LED and Power LED are off, check your
power adapter connection. If the mains outlet is working and is capable
of supplying power to other devices, contact 3Com Technical Support
and ask for a replacement power adapter. Please quote the power
adapter part number shown on the OfficeConnect power adapter you are
using.
Alternatively, quote the part number for your region: