IBM 8676 Hardware Maintenance Manual - Page 39

Troubleshooting, Ethernet, controller, Network, connection, problems

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1. Turn off the server and disconnect all ac power cords. 2. Check for loose cables in the power subsystem. Also check for short circuits, for example, if there is a loose screw causing a short circuit on a circuit board. 3. Remove adapters and disconnect the cables and power connectors to all internal and external devices until the server is at the minimum configuration required to start the server (see "Minimum operating requirements" on page 109). 4. Reconnect all ac power cords and turn on the server. If the server starts up successfully, replace adapters and devices one at a time until the problem is isolated. If the server does not start up from the minimal configuration, replace FRUs of minimal configuration one at a time until the problem is isolated. To use this method, it is important to know the minimum configuration required for a system to start (see page 109). Troubleshooting the Ethernet controller This section provides troubleshooting information for problems that might occur with the 10/100/1000 Mbps Ethernet controller. Ethernet plug wrap test The way the Ethernet controller is tested depends on which operating system you are using (see the Ethernet controller device driver README file). You can use the Ethernet wrap test to determine if a hardware problem is causing the Ethernet connection to fail. To perform the Ethernet wrap test, use the wrap plug (FRU 60G3981) with the diagnostic tests. If this testing method indicates that the hardware is functioning normally but the problem still exists, see "Network connection problems" or inform the network administrator. Network connection problems If the Ethernet controller cannot connect to the network, check the following conditions: v Make sure that the cable is installed correctly. The network cable must be securely attached at all connections. If the cable is attached but the problem remains, try a different cable. If you set the Ethernet controller to operate at either 100 Mbps or 1000 Mbps, you must use Category 5 or higher cabling. v Determine whether the hub supports auto-negotiation. If it does not, try configuring the integrated Ethernet controller manually to match the speed and duplex mode of the hub. v Check the Ethernet controller LEDs on the rear of the server. The Ethernet link status LED, on the rear of the server, is lit when the Ethernet controller receives a LINK pulse from the hub. If the LED is off, there might be a defective connector or cable or a problem with the hub. v Make sure that you are using the correct device drivers which are supplied with the server. v Check for operating-system-specific causes for the problem. v Make sure that the device drivers on the client and server are using the same protocol. Chapter 3. Diagnostics 29

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1.
Turn
off
the
server
and
disconnect
all
ac
power
cords.
2.
Check
for
loose
cables
in
the
power
subsystem.
Also
check
for
short
circuits,
for
example,
if
there
is
a
loose
screw
causing
a
short
circuit
on
a
circuit
board.
3.
Remove
adapters
and
disconnect
the
cables
and
power
connectors
to
all
internal
and
external
devices
until
the
server
is
at
the
minimum
configuration
required
to
start
the
server
(see
“Minimum
operating
requirements”
on
page
109).
4.
Reconnect
all
ac
power
cords
and
turn
on
the
server.
If
the
server
starts
up
successfully,
replace
adapters
and
devices
one
at
a
time
until
the
problem
is
isolated.
If
the
server
does
not
start
up
from
the
minimal
configuration,
replace
FRUs
of
minimal
configuration
one
at
a
time
until
the
problem
is
isolated.
To
use
this
method,
it
is
important
to
know
the
minimum
configuration
required
for
a
system
to
start
(see
page
109).
Troubleshooting
the
Ethernet
controller
This
section
provides
troubleshooting
information
for
problems
that
might
occur
with
the
10/100/1000
Mbps
Ethernet
controller.
Ethernet
plug
wrap
test
The
way
the
Ethernet
controller
is
tested
depends
on
which
operating
system
you
are
using
(see
the
Ethernet
controller
device
driver
README
file).
You
can
use
the
Ethernet
wrap
test
to
determine
if
a
hardware
problem
is
causing
the
Ethernet
connection
to
fail.
To
perform
the
Ethernet
wrap
test,
use
the
wrap
plug
(FRU
60G3981)
with
the
diagnostic
tests.
If
this
testing
method
indicates
that
the
hardware
is
functioning
normally
but
the
problem
still
exists,
see
“Network
connection
problems”
or
inform
the
network
administrator.
Network
connection
problems
If
the
Ethernet
controller
cannot
connect
to
the
network,
check
the
following
conditions:
v
Make
sure
that
the
cable
is
installed
correctly.
The
network
cable
must
be
securely
attached
at
all
connections.
If
the
cable
is
attached
but
the
problem
remains,
try
a
different
cable.
If
you
set
the
Ethernet
controller
to
operate
at
either
100
Mbps
or
1000
Mbps,
you
must
use
Category
5
or
higher
cabling.
v
Determine
whether
the
hub
supports
auto-negotiation.
If
it
does
not,
try
configuring
the
integrated
Ethernet
controller
manually
to
match
the
speed
and
duplex
mode
of
the
hub.
v
Check
the
Ethernet
controller
LEDs
on
the
rear
of
the
server.
The
Ethernet
link
status
LED,
on
the
rear
of
the
server,
is
lit
when
the
Ethernet
controller
receives
a
LINK
pulse
from
the
hub.
If
the
LED
is
off,
there
might
be
a
defective
connector
or
cable
or
a
problem
with
the
hub.
v
Make
sure
that
you
are
using
the
correct
device
drivers
which
are
supplied
with
the
server.
v
Check
for
operating-system-specific
causes
for
the
problem.
v
Make
sure
that
the
device
drivers
on
the
client
and
server
are
using
the
same
protocol.
Chapter
3.
Diagnostics
29