TTE Tech A664 Lab v2.0 User Manual page 22

5. STATE MACHINE
Enabling Grnd-Mode via the DB-25P configuration plug puts the TTE-Switch A664 Lab v2.0 into unre-
NOTE
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
INIT
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
OPERATIONAL
MAINTENANCE
QUIET
PASSIVE
5.2 MAINTENANCE
In the MAINTENANCE state, the TTE-Switch A664 Lab v2.0 provides the following functionality:
State
MAINTENANCE
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
OPERATIONAL
QUIET
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Confidential and Proprietary Information
Network Traffic CLI
No No
Shop-Mode
ON
OFF
OFF
–
–
Network Traffic CLI
Yes No
Shop-Mode
OFF
–
A615 Dataload ARP/ICMP/SNMP
No
Grnd-Mode Maintenance
ON OFF
ON/OFF OFF
ON ON
–
–
A615 Dataload ARP/ICMP/SNMP
Yes
Grnd-Mode Maintenance
OFF OFF
–
21
BIST Execution
No Abbreviated/full
PBIST
Error
–
–
–
– Catastrophic Failure
– Anomaly
BIST Execution
Yes CBIST, IBIST
Error
–
– Catastrophic Failure
Document Number:
D-A664Lab-G-05-001