This procedure helps you to isolate problems with the communications
input/output adapter (IOA) or input/output processor (IOP).
Read and observe the danger notices in
Communication isolation procedure before proceeding with this procedure.
- If the system has logical partitions, perform this procedure
from the logical partition that reported the problem. To
determine if the system has logical partitions, go to Determining if the system has
logical partitions .
- To determine which communications hardware to test, use
the SRC from the problem summary form, or problem log, For details
on line description information, see the Starting a Trace section
of Work with communications trace .
- Perform the following steps:
- Vary off the resources.
- On the Start a Service Tool display, select for
the attached IOPs in the list until you display the suspected failing
hardware.
- Select Verify on the hardware
you want to test. The Verify option
may be valid on the IOP, IOA, or port resource. When it is valid on
the IOP resource, any replaceable memory will be tested. Communications
IOAs are tested by using the Verify option
on the port resource.
- Run the IOA/IOP tests. This may include any of the following:
- Adapter internal test
- Adapter wrap test (requires adapter wrap plug - available from
your hardware service provider).
- Processor internal test
- Memory test
- System port test
Does the IOA/IOP tests complete successfully?
- No: The problem is in the IOA or IOP. If a verify test
identified a failing memory module, replace the memory module. On
multiple card combinations, exchange the IOA card before exchanging
the IOP card. Exchange the failing hardware. See System FRU locations . This
ends the procedure.
- Yes: The IOA/IOP is good. Do not replace the IOA/IOP.
Continue with the next step.
- Before running tests on modems or network equipment, the
remaining local hardware should be verified Since the IOA/IOP
tests have completed successfully, the remaining local hardware to
be tested is the external cable.
Is the IOA adapter type 2838,
with a UTP (unshielded twisted pair) external cable?
- Yes: Continue with the next step.
- No: Go to step 8.
- Is the RJ-45 connector on the external cable correctly
wired according to the EIA/TIA-568A standard? That is,
-Pins 1 and 2 using the same twisted pair,
-Pins 3 and 6 using the same twisted pair,
-Pins 4 and 5 using the same twisted pair,
-Pins 7 and 8 using the same twisted pair.
- Yes: Continue with the next step.
- No: Replace the external cable with correctly wired cable. This
ends the procedure.
- Do the Line Speed and Duplex values of the line description
(DSPLINETH) match the corresponding values for the network device
(router, hub or switch) port?
- No: Change the Line Speed and/or Duplex value for either
the line description or the network device (router, hub or switch)
port. This ends the procedure.
- Yes: Go to step 9.
- Is the cable wrap test option available as
a Verify test option for the hardware you are testing?
- All the local hardware is good. This
completes the local hardware verification. The communications IOA/IOP
and/or external cable is not the failing item.
One of the following
could be causing the problem:
- The network
- Any system or device on the network
- The configuration of any system or device on the network
- Intermittent problems on the network
- A new SRC - perform problem analysis or ask your next level of
support for assistance
Work with the customer or your next level of support to
correct the problem. This ends the procedure.
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