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Wake On LAN

EagleKeeper

EagleKeeper

Discussion Club Moderator<br>Elite Member
Staff member
Situation is an embedded system that has a requirement for be powered off when not in use.

And "scheduled" to be power on at a given AM time.

The problem is the definition of Power OFF.

If the components are drawing no power, include the motherboard, I will accept this as OFF.

To remotely activate the instrument (it has a 30 minute warm up time) from another system, I can have an existing Ethernet connection be used.



I would like to know how the Wake-on-LAN works.


Given that there will be be a cable from the "shut down" computer to a router and the router is not turned off, then what causes the Wake-on-LAN to activate? It can not be the detection of the carrier - that has to exist when plugged into the router.

Is there a signal or command sent from another system that is detected by the network card that then uses special circuitry to kick the "shut down" computer awake - firing up the OS and powering up components?

If there anything within the OS that needs to know about such a setup?
 
If its plugged into power it is using power. even if it is in the "off" position.
if the device is in "standby" it uses little power, just a little more then "off" and if it supports Wake on Lan, it should be easy to wake it with Wake on lan. I don't think it will work at all if the device is "off"
for computers there is normally a setting in the bios that lets WOL wake it.
 
You could look into an APC power strip that has a web interface. I can't remember what they're called right now...smart power strips or something. Basically, you can turn off and on individual power ports remotely.
 
Thanks all

I dug into Wiki regarding the Wake-On-Lan and learned what I need to know.

If the MB for the embedded system does not have the capability, I will look into what Drebo mentioned.
 
Common Courtesy, AFAIK all modern PC systems support wake at a specified time, driven by the on-board clock calendar chip. This would be a much simpler solution to your problem, assuming your embedded device is really a PC.

Wake-onLAN works well when it works, but there are a lot of requirements to make it work. Your hardware+software may or may not support it correctly.

Worst-case, get an APC MasterSwitch. I'm not generally a fan of APC, but this is the remote switched PDU that everybody uses. There are cheaper ones, you get what you pay for, especially note that a lot of the cheapies are neither UL nor ETL certified.
 
Originally posted by: cmetz
Common Courtesy, AFAIK all modern PC systems support wake at a specified time, driven by the on-board clock calendar chip. This would be a much simpler solution to your problem, assuming your embedded device is really a PC.

Wake-on LAN works well when it works, but there are a lot of requirements to make it work. Your hardware+software may or may not support it correctly.

Worst-case, get an APC MasterSwitch. I'm not generally a fan of APC, but this is the remote switched PDU that everybody uses. There are cheaper ones, you get what you pay for, especially note that a lot of the cheapies are neither UL nor ETL certified.
Click to expand...

Remember that embedded systems are not always implemented the way commercial PC systems are.

I have a request for information into the board vendor to determine if it is supported.

I will also have to look into the specific wakeup situation from the onboard calendar clock.

I have determined that the APC type solution can be available for around $100.

Marketing has this crazy idea to be able to have the lasers and other equipment able to be warmed up prior to human intervention. that in itself is fine, but they want it when the system was powered off. and the systems engineer did not call them on it initially - now I have to show that they need to define "OFF" and then I can recommend a cost impact.

Next thing they will want the coffee pot brewing.

 
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