Lanner FW-7582 - Manual (Page 40)

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Programming LAN Bypass
Appendix D
Network Application Platforms
Appendix D:
Programming LAN Bypass
The bypass function is used to link two independent
Ethernet ports when the system fails or powers off. This
means if your system is equipped with a LAN Bypass
function, a system failure or power-off event will not
interrupt your network traffic. There are typically two
statuses for the bypass, one is “Normal” state and the
other is “Bypass” status. Lanner Generation 3 bypass
utility provides software for controlling the LAN Bypass
function:
Lanner ‘s Bypass Modules include WDT (Watch Dog Timer)
controller and Bypass switch.
Our Bypass Modules also include a software development
kit that enables system designer to efficiently design
systems to support bypass functionality. Lanner Bypass
Modules with watchdog control have the following
features:
Communication through SMBUS (I2C) 1.
Independent bypass status control for each pair up to 2.
a total of 4 pairs
Lanner Bypass Modules can bypass systems Ethernet
3.
ports on a host system during three instances: Just-on
(Just-on is the brief moment when the internal power
supply turns on and booting process starts), system
off, or upon software request (during run-time).
Software programmable bypass or normal mode
4.
Software programmable timer interval: 5.
- JUST-ON watchdog timer, used during JUST-ON, has
timer setting of 5~1275 seconds of timer interval.
- Run-Time watchdog timer, used during run-time, has
setting of 1~255 seconds of timer interval.
Multiple Watchdog Timers: 6.
-Two for run-time: It is designed to give you a more
variety of controls of the bypass on port basis. By
using dedicated watchdogs for different pairs of
bypass, you have the flexibility to manage the bypass
status for them differently.
-One for just-on: It is designed to give you the precise
control of the bypass during this phase. You can use
this timer to delay enabling the bypass in just-on
state.
Note:
For sample LAN bypass code and the Bypass 1.
Manual, see the LAN_Bypass folder on the
Driver and Manual CD or the Lanner Assist
Website at http://assist.lannerinc.com . And
browse the support center and look for Lanner
LAN Bypass Module Manual under Software
Utility Manuals folder.
For a description of the physical LAN ports 2.
equipped with this function, refer to Front Panel
Features in Chapter 1 Introduction.