IBM 2074 Installation And Maintenance Information page 36

3. When the top LED turns Green, POST has been completed. The adapter's Intel
4.
2-12
: 2074 Console Support Controller Installation and Maintenance Information
Watch the top LED as your system powers up. Verify the top LED goes from
Red to Yellow to Green. If the top LED is Yellow and the bottom LED is Red
wait for 5 minutes to see if the status changes. If the top LED remains Red or
turns Yellow and then Red again, the adapter is not working properly. Power
down your 2074 and reinstall the adapter. Power the 2074 back on. If the
condition repeats itself, replace the ESCON adapter. If you have already
replaced the ESCON adapter, contact the next level of service.
960 processor will then load the 3274 device emulation. The bottom LED
indicates the status of the emulation.
When the adapter is first powered on the bottom LED should be Red. This is a
normal indication that emulation has not yet been loaded. The LED will remain
Red while POST runs. Once the top LED turns Green, indicating POST has
been successful, the bottom LED should quickly turn Orange.
If the top LED is Green and the bottom LED is Red, wait for one minute. If the
bottom LED remains Red, the emulation has not successfully loaded. Perform a
hardware reset (or Power Off/Power On) of your 2074. If the problem persists,
replace the ESCON adapter. If you have already replaced the ESCON adapter,
contact the next level of service.
With your 2074 powered on, check to make sure both LEDs are lit. If the top
LED is Green and the bottom LED is Orange, then the adapter has successfully
completed POST and loaded firmware. The adapter is operational. Depending
on the configuration, the bottom LED will remain Orange until the first Establish
Logical Path (ELP) is received from the host channel connected to the 2074.
If ESCON connectivity between the host and the 2074 still has not been
established the following should be considered:
v If both lights on the card are Green then you have a configuration problem
and not a media (cable, trunk etc.), NOR a 2074 ESCON adapter hardware
problem. If you suspect that there may be a configuration problem see the
'2074 Console Support Controller Configuration Guide' and the appropriate
Host I/O configuration documentation.
v If the top light is Green and the bottom light is Orange then you may have
either a configuration, media (cable, trunk, etc.), or 2074 ESCON adapter
problem. First you should make sure both ends of the ESCON cable are
properly seated. Unplug each end one at a time and plug it back in. Make
sure there is a 'click' when the cable connector is inserted into the receptacle.
You also should clean the ends of the ESCON cable and receptacle with a
Fiber Optic Cleaning kit. At this point, if the bottom light on the ESCON card
is still Orange, then you need to conduct ESCON Link Fault Isolation. Further
ESCON Link Fault Isolation is beyond the scope of this service manual. You
should proceed with ESCON Link Fault Isolation procedures that you are
familiar with and that are appropriate to the Host system to which the 2074 is
connected. This may include taking light measurements with a light meter.
Note also that there are no ESCON wrap tests that can be run at the 2074
ESCON adapter.
v From an OS/2 window, you can use the BTITOOL to display neighbor node
information and to display code violation and bit error counters. Each
command will need to be run once for each of the adapters, or better yet, for
the ESCON adapter whose link state you are trying to debug. The command
is run from an OS/2 Window.
– Use BTITOOL SHOW NEIGHBOR INFO CARD=x (where x=0 or 1) for
neighborhood node information.
Sample output: