IBM 2074 Installation And Maintenance Information page 41

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Table 2-3. Sample Command Output (continued)
Adapter Type
Ethernet PCI Adapter
Token Ring Adapter
If the LAN cables aren't certified, then they might not function at the rated speed.
This isn't your problem. You have two of each LAN adapter in this system. If you
have a situation that one adapter's LED isn't on, then temporarily move the cable to
the other adapter as a test. If this adapter fails too, then the customer should be
asked to verify their LAN. Ethernet adapters will immediately recognize the Hub (if
their drivers are loaded). Token Ring adapters only find the MAU during initialization
(a reboot of the 2074).
Note: The on planar Ethernet runs at a PCI bus speed of 33 Mhz. The second
Ethernet in slot 4 runs at a PCI bus speed of 100 Mhz.
Let's start with the LEDs on the adapters. We will only consider the adapters that
the customer has attached to their LAN. Verify which of the four LAN adapters have
cables attached to it. Disregard those that have no cable attached. Are the LEDs
correct? For Token Ring adapters the green LED should be on solid. If it isn't refer
to the LAN diagnostics section in this manual for Token Ring. Be aware that Token
Ring adapters won't connect to the MAU unless they were attached during
initialization. To be sure, reboot the 2074 and wait until the OS/2 desktop appears.
Caution
Reboot will be disruptive to all connections through the 2074
Then check the lights. For Ethernet: are the LINK LEDs correct? If it isn't refer to
the LAN diagnostics section in the manual for Ethernet. Also, check the 100MB or
100 TX LED. Verify if its state is correct.
If these Token Ring adapters are the only ones on the LAN, then modify their
configuration to force their speed to 16 Mb/s if it isn't already there. You can modify
C:/IBMCOM/PROTOCOL.INI and change "AUTO" to "M16" for these Token Ring
adapters.
During 2074 reboot or boot, are any error messages displayed? Did you have to
press "ENTER" due to an error? If so then these errors need to be attended to. You
shouldn't receive any of these error messages if the LAN adapters are missing their
cables, so they aren't a good diagnostics aid. They are an indication that the
adapter is missing or broken.
The PING command can have a block size parameter after the IP address. Try
testing with different values.
If you received no error messages, and the lights are correct, try "pinging" yourself.
From an OS/2 window execute the command PING 127.0.0.1 1024 1. This is the
loop back interface. It should always pass. Next try pinging the addresses of the
LAN adapters the customer has attached to LANs. You can get the addresses of
Determining Proper LAN Adapter LED
Illumination
See "Start Ethernet PCI Adapter Diagnostic"
at step 9 on page 2-23.
See "Start Token Ring Adapter Diagnostic" at
step 6 on page 2-21.
Chapter 2. Maintenance Information
2-17