Advantech FWA-2320, Руководство пользователя, Страница: 46 / 100

FWA-2320 User Manual 36

Power Up
Host system is turned on / powers up (DC on)

Power Down
Host system is turned off / powers down (DC off)

Power Reset
Host system is reset or rebooted

Watchdog Start
LAN bypass watchdog is started or strobed for the first time

Watchdog Timeout
LAN bypass watchdog timed out

External Trigger
Global Watchdog Trigger input (dedicated GPIO pin)
In addition to the event driven model, it is also possible to set the connectivity for a
bypass segment via the SW API.
2.5.3.1 LAN Bypass Segments
The FWA-2320 supports four onboard traffic ports which are grouped into 2 bypass
segments as shown below:
Figure 2.19 Onboard LAN ports and bypass segments
2.5.3.2 Bypass Watchdog Support
Each bypass segment is support by an independent watchdog timer. The timer basis
is set to 100ms. Watchdog timeout periods can be set between 100ms and 6553.5
seconds (about 109 minutes).
The FWA-2320 also supports a global watchdog trigger which allows multiple bypass
segments to be controlled at the same time. The global watchdog signal is connected
between the two onboard bypass segments and also to the PCIe extension connec-
tor (for future use).
2.5.3.3 LED Behaviour
Advantech Advanced LAN bypass uses a LED to show the state of a bypass seg-
ment. Usually the bypass LED is implemented as a dual colour LED combined with a
regular LAN port LED. The table below shows the status of the bypass LED, only. For
a complete description of port LEDs please refer to Appendix A.3.2).
Table 2.19: Bypass States and LED Behavior
State LED Status
CONNECT Off
BYPASS Solid Amber
DISCONNECT Blinking Amber (1 Hz)