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Appendix D:
Programming Generation
2 and 3 LAN Bypass
Lanner Generation 3 Bypass
The bypass function is used tolink two independent
Ethernet ports when the system crashes or powers
off. This means if your system is equipped with a LAN
Bypass function, a condition in your system will not
interrupt your network traffic. Different from the previous
two generations (Gen1 and Gen2), the Lanner Bypass
Gen 3 employs a programming method to control the
bypass function by software. There are typically two
communication status for the bypass function, one is
"Normal" and another is "Bypass" status. Furthermore, the
Lanner Bypass software is capable to control the bypass
status in the following 3 states:
1.
When the system powers off, it can be forced to
enable the LAN Bypass function .
2.
When the system is in the just-on state which is a
brief moment when it powers up .
3.
When the system is running
And the Lanner bypass possess the following features:
1.
Communication through SMBUS (I2C)
2.
Independent bypass status control for each pair up to
a total of 4 pairs
3.
Lanner Bypass Modules can bypass systems Ethernet
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).
4.
Software programmable bypass or normal mode
5.
Software programmable timer interval:
- 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.
6.
Multiple Watchdog Timers:
-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.
Please refer to the LAN_Bypass_Watchdog folder on the
Driver and Manual CD.
For sample LAN bypass code and the Bypass Manual, see
the LAN_Bypass folder on the Driver and Manual CD or
the Lanner support Website at
download-center/. Look for Accessories folder under the
User Manuals category.
For a description of the physical LAN ports equipped
with this function, refer to Front Panel Features in Chapter
1 Introduction.
http://www.lannerinc.com/
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