HP 340 Series Service Manual page 94

If extended testing is selected by pressing I
CTRL
~[]]
then
CD,
the LAN circuits are subject to
the normal testing plus external loop back tests. The following error rnessages may be displayed
below the LAN identification lllessage:
• CABLE Failed
This shows that the cable is not connected or improperly terminated.
• MAU Failed
This shows that the MAU circuitry failed. This is not likely on SPUs where the interface
is built-in. On non-built-in LAN cards this could mean that the MAU was not plugged
into the card.
• NO HEARTBEAT
This message is only a warning. This shows that the interfaces self-test (done after every
transmission) is failing.
If no servers respond to the Boot ROM's attempts to initiate a boot session then the user will
see no other indication of LAN activity.
For each server that responds, display will show : LAN, followed by the select code, followed by
either the servers name or its Link Address. Under this will appear the list of systems provided
by that server:
:LAN, 21, 080009000008, or
:LAN, 21, (local server name)
If a system calls the Boot ROM to boot/reboot a system and a file name is specified and the
msus is for LAN, the Boot ROM will retry indefinitly to contact the server at the given link
address. All other devices have a fixed number of retries/timeout and will report No Medium
or SYSTEM NOT FOUND.
The system call for a boot/reboot on LAN is the only time an indefinite retry/timeout is used.
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Boot ROM Functions