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Table 4-1. Selftest LEDs and Subtest Descriptions (Continued)
CODE
LED
INDICATION
HEX
NO.
H
I J K
L M N
*
SUBTEST
DESCRIPTION
27
0
1
0 0
1 1 1 1
82586
Interrupt
28
0
1
0
1
0
0
0
1
82586
Reset
29
0
1
0
1
0
0
1 1
PBUS register
addressing
2A
0
1
0
1
0
1
0
1
82586
RAM addressing
28
0
1
0
1
0
1 1 1
82586
Diagnose
2C
0
1
0
1 1
0 0
1
8023
Loopback
20
0
1
0
1 1
0
1 1
82586
Write to FIFOs
2E
0
1
0
1 1 1
0
1
MAU
Loopback on medium
*
ST (Selftest) LED
The final test in Table 4-1, the MAU loopback test, sends the following frame on
the coaxial cable:
DESTINATION ADDRESS
=
SOURCE ADDRESS
=
the unique station address of this LANIC, from the station
address PROM, which may also be found on the LANICs
identifying label
TYPE FIELD:
2 bytes containing the data field length, 1134 bytes
DATA FIELD:
3 SAP bytes - 0,
1,
3EH - identifying this frame as a test
response frame with null DSAP and SSAP
31 ASCII bytes
=
"HP3000_NODE_XXXXXXXXXXXX TEST. ", where
XXXXXXXXXXXX is the station address in ASCII
1100 bytes with a binary incrementing pattern
Maintenance
4-7
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