2
.4
Troubleshooting
802.3
INTERFACE
2.4.2
User Self Diagnostics Description (Sheet 1
of
4)
The
Etherlink
Diagnostic supplied with
system software includes a diagnostic
program called 3C505.EXE. This diag-
nostic may
be
used
to
verify operation
of
the
802.
3 hardware option.
The diagnostic is
initiated
from
the
DDS
command level and
typically
takes
5 minutes
to
complete
in
a
Wang
PC200/300
or
an
IBM
AT.
As
it
runs
it
displays
the
name of the
test
executing
and
a pass count.
In
the
event of a hardware
error
the
test
stops
and
an
error
message is dis-
played.
The
diagnostic programs include the
following
tests:
0 Adapter self
test
1 Preliminary
test
2 OMA
test
3 Packet
test
4 Recognizer
test
5 Active
ping
pong
test
6 Passive
ping
pong
[receive]
test
7 NS Echo server
Tests
1-4
run
in
sequence. Tests 3
and
4 require a loopback
plug
for
the
test
to
run successfully. There are
three
types of loopback connector
(see paragraph 2.4.1
).
Wang loopback
plug
(190-0756)
has a LED
and
a
switch.
The
LED indicates
that
12
volts is
being
sent
to
the
transceiver.
The
switch
is used
in
testing the Colli-
sion Detection ability of the
3C505
board. For proper operation of this
diagnostic
the
''CS''
switch
must
be
disabled.
During execution
of
test
3 the desti-
nation address
of
the
test
packet
used is incremented
after
each packet
transmitted.
Failure
to
'Jse
a
loop
back
plug
before initiating
tests
1
-4
will
result
in
degraded network
perfor-
mance
and
cause erroneous
test
re-
sults as randomly addressed packets
will propagate onto the network.
Tests 5
and
7 are synchronized
tests
that
run over the network:
one
node
sends random data
to
a selected des-
tination node
that
··echoes'' back
the
data
received.
Test
6 is a passive
monitor.
741-1859
Page
2-7
COMPANY
CONFIDENTIAL
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