User's Manual
Table Of Contents
- Front Cover
- Table of Contents
- List of Tables
- List of Figures
- Disclaimer
- Limited Rights Notice
- 1 Introduction
- 2 Overview
- 3 Functional description
- 4 Getting started
- 5 State machine
- 6 Creating a switch configuration
- 7 Diagnosis
- 8 Troubleshooting
- Appendix A List of Built-In Self-Tests
- Appendix B Serial terminal output at start-up
- Glossary
- References
- Index
5. STATE MACHINE
NOTE
Enabling Grnd-Mode via the DB-25P configuration plug puts the TTE-Switch A664 Lab v2.0 into unre-
stricted mode. Disabling Grnd-Mode puts the switch into restricted mode, by contrast.
Restricted mode disallows maintenance operations that might pose a safety hazard during non-ground
operation (i.e., flight mode) for a behavior similar to a flight switch.
5.1 INIT
In the INIT state, the TTE-Switch A664 Lab v2.0 provides the following functionality:
State Network Traffic CLI A615 Dataload ARP/ICMP/SNMP BIST Execution
INIT No No No No Abbreviated/full
PBIST
The TTE-Switch A664 Lab v2.0 transitions to the INIT state after a power-up or reset. In the INIT state,
the switch performs an initialization sequence. The firmware initializes the peripherals of the switch for the
switch IP and the end system IP. The firmware then reads out the pins on the configuration interface. If
Grnd-Mode is OFF, the configuration pins will not be read from the interface. Instead, the position stored
in non-volatile memory will be used.
After checking the parity of the configuration index, the availability and the CRC of the selected configura-
tion, the switch applies the configuration.
Transitions
Depending on the DB-25P configuration plug settings and whether errors are detected or not, several
transitions from the INIT state are possible:
Transition to Shop-Mode Grnd-Mode Maintenance Error
Ð→ SHOP ON ON OFF –
Ð→ OPERATIONAL OFF ON/OFF OFF –
Ð→ MAINTENANCE OFF ON ON –
Ð→ QUIET – – – Catastrophic Failure
Ð→ PASSIVE – – – Anomaly
5.2 MAINTENANCE
In the MAINTENANCE state, the TTE-Switch A664 Lab v2.0 provides the following functionality:
State Network Traffic CLI A615 Dataload ARP/ICMP/SNMP BIST Execution
MAINTENANCE Yes No Yes Yes CBIST, IBIST
Transitions
Depending on the DB-25P configuration plug settings and whether errors are detected or not, several
transitions from the MAINTENANCE state are possible:
Transition to Shop-Mode Grnd-Mode Maintenance Error
Ð→ OPERATIONAL OFF OFF OFF –
Ð→ QUIET – – – Catastrophic Failure
© TTTech Computertechnik AG 2020. All rights reserved.
Confidential and Proprietary Information
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Document Number:
D-A664Lab-G-05-001