On Wed, 28 Jun 2000, Matt Herbert wrote:
> Anybody know what the Wake On LAN header is on ethernet cards?
For connection to the WOL header on the motherboard, of course. ;-)
> I've plugged it into my MB (which supports WOL), but what exactly does it
> let me do?
If you send a magic packet to the MAC address of that card, the card will
tell the motherboard to turn on. The system needs to support soft power
control (generally, ATX systems) to do this. There are various uses for this;
the one I usually hear of is turning on workstations for unattended network
backup, then turning them back off when they're done.
> I suspect I can turn the computer on remotely by ?pinging? it or
> something?
The magic packet is done at the data link layer (layer two of the OSI
model), not the IP layer.
> I've noticed the Link light stays light on the Hub and Card even when the
> computer is off.
This is also related to the ATX standard. ATX soft power systems don't
really "turn off"; they simply go into a low-power state where most of the
equipment (but not all) is powered off. In particular, *the PCI cards are
still hot*. Thus, it is critical when working on ATX systems to disconnect
all power sources and then attempt to "turn on" the system (to ensure all the
capacitors are drained). Otherwise, you can blow up your expansion cards. I
speak from personal experience here. ;-)
--
Ben Scott <[EMAIL PROTECTED]>
Net Technologies, Inc. <http://www.ntisys.com>
Voice: (800)905-3049 x18 Fax: (978)499-7839
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