IBM Power 775 Service Procedure page 26

e. If action is required, Log onto the EMS and run /usr/bin/lsnwlinkinfo on the affected D-link to
specifically diagnose any problems with the link before proceeding further.
2. Before proceeding further, ensure that the optical connectors on both ends of the affected D-Link cable are fully
seated.
a. Pull out the push/pull tab on the connector end, and push it back in, to assure that the connector is fully
'clicked' into place.
b. Repeat on the other end of the D-Link.
c. Repeat the diagnostic procedure in Step 1 above, to ensure that the problem has not been remedied,
before proceeding further.
Note that the following procedures will affect other D-Link Cables with connectors in the same groupers as
the cable being diagnosed, and may have some impact on performance of neighboring D-Ports on the same
Hub/Switch as the D-Ports being diagnosed. Verify that this will not detrimentally affect system operation
before proceeding further.
3. Remove the D-Link Cable connectors from the node, using the procedure described in
source not found., Error! Reference source not
grouper must be removed, as described in
impact operation of any other cables that have connectors inserted into the same grouper (i.e., in the same row of D-
Ports).
4. On the D-Port A and D-Port B ports, install 24-position Straight Wrap Plugs (IBM PN: 74Y0792; WRAP PLUG, 24
POSITION, STRAIGHT, WITH SLEEVE, WITH BACK). If only one 24-position Straight Wrap Plug is available,
Steps 4-6 can be executed sequentially on each D-Port.
5. Wait a few seconds.
6. From the EMS, run the /usr/bin/nwlinkdiag command on both ports to display information about whether the link is
able to train with the wrap device installed, and whether the fault can be isolated to a cable.
• Note: The lnwlinkdiag command is described in the specification "High performance clustering
using the 9125-F2C – Management Guide".
7. If the lsnwlinkdiag command indicates D-Port failure on either D-Port A or D-Port B, then the link cannot be
repaired without replacing the corresponding CEC drawer. If the link initialization tests succeed on both D-Ports,
then the D-Ports in both CEC drawers are functional – proceed to the following step.
8. Clean all cable connectors and all D-Port connectors using the Fiber Optic Cleaning Tool (IBM PN: 74Y0685).
9. Install again the D-Link Cable using the procedure described in
Cable or Section 3.10, Replace a D-Link cable in D-Link groupers
10. Run the lsnwlinkinfo link initialization test to determine if the ports can correctly come up to the
UP_OPERATIONAL state using the cleaned optical cable installed
11. If the link diagnostic test fails, remove the original cable and install a replacement cable and repeat from Step 10. If
the test succeeds, the link is repaired.
Summary: If a link failure is determined to be due to a failure within the D-Port A or D-Port B of the CEC
drawers, and the failure can not be handled using Fail-in-Place resources, the drawer must be either replaced
or repaired. Otherwise, cleaning of the connectors or replacement of the D-Link cable should repair the failure.
Power 775 D-Link Service Procedure
PN: 41U8487, EC N44172
found.. If the connectors are included in a grouper, the full
Section 3.4, Clean the D-Link Connectors in the grouper .
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Section 3.9, Replace an Individual D-Link Optical
.
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