Cabletron Systems 520 - Manual (Page 72)

Problem Solving
A-2
Normal Powerup
When the router power is initially turned on, the following events occur:
Event Description
1 The router’s Power LED lights as soon as power is
applied to the unit.
2 The router initiates its built-in self-test. Flashing port serial
line LEDs and activity LEDs indicate that the router is
running various subroutines as part of the self-test. See Table
.
3 After successful completion of the self-test, the
Module OK LED lights, and remains lit.
The Network Activity LED blinks at a rate
proportional to the amount of activity on the port.
4 The remaining LEDs now indicate their operational status, as
described in Table .