User’s Manual
Custom Embedded Solutions
WIN Enterpris es, Inc ., s ales @win-ent.c om
www.win-ent.com
, (978) 688-2000
54
Appendix B: LAN Bypass Programming Guide
WIN ENTERPRISES PL-80240 provides LAN bypass functionality to ensure that
data can still pass through the device, even when it is powered off. This feature helps
ensure the continuous flow of data through the device in the event of a hardware
failure. For network security appliances deployed at the gateway, for example, it is
crucial that they provide LAN bypass functionality to ensure that hardware failure on
these appliances will not bring down the entire network. Related BIOS settings are in
the “Super IO Configuration” section.
The PL-80240 provides one pair bypass function on two LAN 1 & 2 ports (Refer to
Page 10, CN22 & CN23 on moyherboard). The BIOS “Power on/off Bypass” settings
control the bypass function through GPIO pins.
1. LAN Bypass Definition
There are two bypass settings in BIOS setup.
Power off Bypass: Enable/Disable
Power on Bypass: Enable/Disable
Note: If “Power off Bypass” set to “Disable”, the “Power on Bypass” also set to
“Disable” and it can not allow to be changed or selected.
The table and figures below are the explanation for the behavior of LAN Bypass
function.
Power status
BIOS Bypass setting
Bypass Behavior
Power off Bypass: Disable
Power on Bypass: Disable
A
Power off Bypass: Enable
Power on Bypass: Disable
A
ON
Power off Bypass: Enable
Power on Bypass: Enable
* Note
B
Power off Bypass: Disable
Power on Bypass: Disable
A
OFF
Power off Bypass: Enable
Power on Bypass: Disable
B
