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[#] Mon Apr 02 2018 09:55:47 EDT from IGnatius T Foobar @ Uncensored

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You know what, I've never had the opportunity to work with IFL from the deployment side. How does one allocate DASD to Linux images on a mainframe? Do you have to give an entire LU to Linux and let it manage itself? Or do the Linux images sit inside a z/OS dataset?

[#] Wed Oct 03 2018 13:38:12 EDT from IGnatius T Foobar @ Uncensored

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Thought for the day.

I have some places in my home where I want to install LED strip lighting, which requires 12 volt transformers. One place is in a bathroom, where I also want to install an in-wall Bluetooth amplifier. So I got to thinking: would it make sense to install a central 12 volt supply in the home and wire it out to the locations where it is needed?

Is this a thing? Cars, boats, and RVs have 12 volt distribution, so why not a house?

[#] Wed Oct 03 2018 20:37:24 EDT from Decomposed @ Uncensored

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Mm.  I don't know the answer, but doesn't low voltage have difficulty traveling very far unless the wire is extremely thick?  I'd think that resistance would eat up the low voltage.

Again, I'm very knowledgeable about electricity.  I only know that in the house I'm building, the power company wants to step down its high voltage near my house, not hundreds of feet away at the street even though that would be a lot less expensive.



[#] Wed Oct 03 2018 20:38:21 EDT from Decomposed @ Uncensored

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Correction:  Again, I'm ***NOT*** very knowledgeable about electricity.



[#] Fri Oct 05 2018 12:03:37 EDT from Haven @ Uncensored

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POE level 3 (I think that is what it is called or something like that), puts out a maximum of 13 volts.   So you could just run cat 6 everwhere, and hook up POE  injectors and run it that way.  Then if you need to later you can use them as regular network, or what have you.  

 



[#] Sat Oct 06 2018 10:09:36 EDT from IGnatius T Foobar @ Uncensored

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That sounds horrifying. :) But I believe you may be misremembering the PoE standard -- 802.3af is 13 *watts* per port. PoE is 48 volts. Decomposed is correct about voltage drop; that's why the power company wants to keep the voltage as high as possible for as long as possible. I have an on-site transformer too :)

I spent a lot of my childhood around boats, where there was always a 120 volt system and a 12 volt system. The 12 volt system did use thick wires.
Remember that watts = volts * amps, so for the same amount of power, if the volts are lower the amps are higher. It becomes a question of what's going to cost you more, the loss from a transformer being less than 100% efficient or the thicker cables.

Telecom equipment runs on -48 volts. It's the standard for their stuff.
Their racks are always fitted with a -48 volt power supply (usually a few of them). The "UPS" is just a four-pack of batteries. It actually works really well, which is why equipment that can be used within a telecom facility is often available with your choice of power supplies: 100-240VAC or -48VDC. Some number of years ago there was a big push to move computer equipment to -48VDC so that the power supplies that are in servers etc. don't have to deal with as much loss. This push was killed by the fact that data centers would have to install giant copper conductors everywhere, and that was right around the time the price of copper started climbing again.

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