10BASE-T Stackable Hubs
will halt, the Hub ID “A” indicator will flash, and the last frame lit in the
series will show what test failed.
The parts of the Power-on Self Test, and the indicator associated with each
part, are as follows:
1. PROM Test (Port 1 Frame) Tests the integrity of the hub’s internal
Read-Only Memory.
2. DRAM Test (Port 2 Frame) Tests the hub’s internal Random-
Access Memory.
3. LED Display Test (Port 3 Frame) Tests to make sure the front
panel display works properly. Failure of this test is not considered a
fatal error, and failure will not cause the hub to halt.
4. EEPROM Test (Port 4 Frame) Tests the hub’s internal parameter
storage memory. Failure of this test is not considered a fatal error,
and failure will not cause the hub to halt. Hub parameters may be
lost, however.
5. Flash Memory Test (Port 5 Frame) Tests the hub’s flash memory,
used for storing the hub’s run-time image.
6. Network Monitor SRAM (Port 6 Frame) Tests the memory used in
the hub for collecting network statistics.
7. DL-P2517B NIC Test (Port 7 Frame) Tests the hub’s internal
network interface controller, used for in-band SNMP and Telnet
communication over the Ethernet network.
8. Expansion Module Test (Port 8 Frame) Tests the expansion
module attached to the rear of the hub, if there is one. Failure of this
test is not considered a fatal error, and failure will not cause the hub to
halt.
If any of the self-test items fail, contact your technical service representative
for assistance.
B-2 Power-On Self Test
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