3Com S24x, S27x, S26x Power-Up Diagnostics/Verification, Power Up, Sequence, Function Description

Power-Up Diagnostics/Verification

Power-Up Diagnostics/Verification

Introduction	Diagnostics run when a node is powered up. Basic tests are run from PROM and
	more extensive diagnostics are run during startup.
	If the node detects a lack of software, it sends a message to the CTP. The yellow LED
	lights and a 2-digit code is displayed. You must initiate a software coldload if
	needed.
Power Up
	This is the power-up sequence.

Sequence

Function	Description
ROM-based diagnostics	Local core self-tests. Boots PROM
	checksum, MPU test, Program RAM test.
FLASH verification	Checksum FLASH image.
Loads RAM diagnostics	Uncompresses FLASH diagnostics image
	to RAM and executes.
RAM-based diagnostics	Tests I/O cards and everything else on card.
Loads RAM operational	Uncompresses FLASH operational
software	software image to RAM and executes.
Verifies Config database	Verifies resident CMEM database.

Node Restarts The three types of restarts are:

•Coldstart

•Warmstart

•Default Node

Node Coldstart A node coldstart is similar to a power-up. It follows the power-up sequence except that it is initiated when the operator presses the RESET button on the front panel or when certain software faults occur. All calls are cleared along with Event queues. A Node coldstart loads only configuration memory.

Node Warmstart A node warmstart can be initiated by a software fault or an operator command. It is identical to a coldstart except for the following:

•No diagnostic testing is performed.

•Code downloads are not performed unless necessary.

•Event logs are not erased.

3-24 PathBuilder S24x, 26x, and 27x Switch Hardware Installation