FDDI/DX

Selftest

Normal mode selftests run at powerup when the DIAG/NORM switch is in the NORM position. Attach a terminal set for 9600 baud, 8 data bits, no parity, and 1 stop bit to the serial port to monitor normal mode selftest output.

Extended Selftests

Extended selftests are run with the DIAG/NORM switch in the DIAG position. Attach a terminal set for 9600 baud, 8 data bits, no parity, and 1 stop bit to the serial port, and attach loopback cables between ports FDDI-A and FDDI-B. Enter s to enable the extended selftests. Enter a to display the Diagnostic Engineering Monitor (DEMON) menu.

LEDs

LEDs indicate the status of the FDDI PCB and the network during operation.

LED 4	LEDs 3 & 1	LEDs 2 & 0	LED STATUS
x	Off	Off	Connection is dead
x	Off	On	Connection sequence in progress
Off	On	Off	Connection is complete and is part of token path
On	On	Off	Connection is complete but there is no token
x	On	On	Connection is too noisy

LEDs 4, 1, and 0 indicate connection status for port FDDI-A.

LEDs 4, 3, and 2 indicate connection status for port FDDI-B.

LED 4, RINGOP, is ON when the ring is not operational.

LED 5, PACKETIO, changes state each time a packet is received or successfully transmitted. LEDs 6 and 7 blink alternately four times per second under normal conditions.

LEDs 6 and 7 blink together two times per second when a non-recoverable firmware problem occurs.

LED Patterns During Selftests