This procedure helps you to isolate problems with the communications
input/output adapter (IOA) or input/output processor (IOP).
Please 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:
- 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 test(s). 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 test(s) 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 Removing
and replacing parts. 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 test(s) 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 - go to Start of call procedure 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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