2–1
2
Problem Solving
2.1 Introduction
This chapter describes several problem-solving procedures that can help diagnose
failures and isolate faulty field-replaceable units (FRUs) in the DECbridge 500/600
series. To aid you in this task, the DECbridge 500/600 series contains the following
problem-solving features:
•
A comprehensive self-test program that executes automatically on power up,
and can also be invoked remotely by the network management software.
•
Local LED indicators that provide information on FRU status, LAN activity,
port states, network interface selection (AUI or ThinWire), IEEE 802.3/Ether-
net transceiver power, and FDDI physical connection state. Note that LED
information can be read remotely using the network management software.
•
A DIP switch that can restore bridge parameters to their factory settings.
Section 2.2 describes how the bridge reacts to a normal power-up operation when no
faults are detected by the self-test diagnostics. The remaining sections in this chapter
describe how to interpret the results of the diagnostics when faults are detected.
