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78 Chapter 5

Troubleshooting

LED Diagnostics

The HP EISA and HSC FDDI adapters have built-in self-test diagnostics

that are executed when the system probes the bus adapter/slot. This

occurs at power-up or reset of the card. These self-test diagnostics test

both the card’s hardware and ﬁrmware and the card’s functionality.

Observing the adapter’s LEDs will indicate at what stage the card is

functioning. These LEDs exhibit various illumination, dependent upon

the state of the card.

The LEDs are located on the faceplate. Figure 5-1 shows the

conﬁguration of the LEDs for port B for both EISA and HSC FDDI. Table

5-2 deﬁnes HP EISA FDDI card states. Table 5-3 deﬁnes HP HSC FDDI

card states.

Cannot reach a host on a

remote network.

• Use ping to test connectivity to stations on your

local ring.

• Distinguish between an unknown host, which

indicates a /etc/hosts ﬁle problem; and a

non-response, which usually indicates a routing

problem.

• Use fddilink to see if you are communicating with

your upstream and downstream neighbors on the

ring.

• Check the arp table with arp -a.

• Use netstat -r to check routing tables. Refer to

the man page for expected output.

Cannot connect to ring. For dual attach stations, check the cables for PHY A and

PHY B to verify appropriate connections to neighbor

stations.

Ring state is unstable. • Use fddilink to check for abnormal statistics. If

the attribute LER is near the Alarm value, check for

poor connections.

• Verify optical power loss does not exceed 11 decibels

between transmitter and receiver pairs.

Symptom Action